CN220828276U - Peak regulating system for coupling electrolytic water hydrogen storage and gas steam combined cycle unit - Google Patents

Abstract

The application discloses a peak shaving system for coupling an electrolyzed water hydrogen storage and gas steam combined cycle unit, which comprises a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit and a solid oxide electrolyzed water hydrogen production unit, wherein the gas turbine power generation unit is connected with the waste heat boiler power generation unit; the heat exchange unit comprises an electric heater and a heat exchanger, and the waste heat boiler power generation unit is used for receiving a first part of gas turbine exhaust gas with a first temperature discharged by the gas turbine power generation unit and providing a first part of steam turbine exhaust gas with a second temperature for the heat exchanger; the electric heater is used for receiving a second part of gas turbine exhaust gas with a first temperature of the gas turbine power generation unit and providing a third gas turbine exhaust gas with a third temperature for the heat exchanger, the heat exchanger is configured to provide water vapor to be electrolyzed with a temperature required by the electrolyzed water hydrogen generation unit for the electrolyzed water hydrogen generation unit, and the system applies a solid oxide electrolyzed water technology to the gas-steam combined cycle unit to achieve the peak shaving purpose through an energy storage and hydrogen-electricity coupling link.

Description

Peak regulating system for coupling electrolytic water hydrogen storage and gas steam combined cycle unit

Technical Field

The application relates to the technical field of energy conversion and physical energy storage, in particular to a peak shaving system for coupling an electrolyzed water hydrogen storage unit with a fuel gas steam combined cycle unit.

Background

With the rapid development of the economy in China, the energy demand and the carbon emission are greatly increased, and according to the concept of carbon peak and carbon neutralization of double carbon, the construction of a clean low-carbon high-efficiency energy system and the construction of a novel power system mainly containing new energy become necessary. The novel power system is a hub platform for realizing the 'double-carbon' target, and if the 'double-carbon' target is to be realized, the fossil energy consumption is basically reduced, and the non-fossil energy consumption is increased.

Compared with the traditional coal-fired power generation unit, the gas-steam combined cycle power generation unit has the advantages of short construction period, small occupied area, flexible operation mode and the like, and the available fuel diversity can improve the primary energy utilization efficiency, reduce carbon emission from the source, has good energy-saving, environment-friendly and social benefits, and is a mainstream trend of future power plants. Hydrogen is used as a clean secondary energy source with no carbon emission and high heat value, is widely applied to various energy fields, and gradually starts to be popularized along with the rapid development of technologies such as hydrogen energy preparation, storage, transportation and the like. In the process of hydrogen production by water electrolysis, the surplus energy converted from renewable energy sources during the valley time of the unit can be converted into hydrogen for storage, and the energy in the hydrogen is converted into the electric energy through the energy storage and hydrogen-electricity coupling links, so that the long-period large-planning, optimizing and dispatching of the surplus energy sources is realized, and the peak regulation purpose is further achieved.

The gas-steam combined cycle unit takes natural gas as fuel to be input, high-temperature gas is generated through combustion reaction to drive a turbine to rotate so as to generate power, and meanwhile, flue gas exhausted by the turbine is heated by a water turbine in a waste heat boiler to rotate so as to generate power. The series of processes are all established on the premise that the gas turbine has sufficient fuel input, and when the purity of the natural gas is reduced or the fuel supply is insufficient, the power generation efficiency of the gas-steam combined cycle unit is affected, so that the energy storage peak shaving is particularly important, the hydrogen energy storage is used as the cleanest secondary energy, and the coupling of the hydrogen energy storage and the power generation is the development trend of a future peak shaving system. At present, three modes of water electrolysis mainly comprise alkaline water electrolysis, proton exchange membrane water electrolysis and solid oxide water electrolysis technologies. The alkaline water electrolysis technology has low hydrogen electrolysis efficiency and has the problem of alkali permeation and environmental pollution; in the proton exchange membrane water electrolysis technology, noble metals such as Ir, ru and the like are needed as catalysts although the hydrogen production efficiency is higher, so that the processing cost is higher; although the solid oxide electrolysis water technology has high hydrogen production efficiency and can adopt a nickel-based electrode with low price, the ultra-high operation temperature makes the implementation difficult, if the solid oxide electrolysis water is used for producing hydrogen, a large amount of electric energy is required to be consumed for heating the water so that the temperature reaches the electrolysis condition, a large amount of electrolysis water is also required to be supplemented in the electrolysis process, and the development of the technology in a power plant is hindered by high temperature and continuous water supply.

Therefore, the application is urgently needed to develop a peak shaving system for coupling the electrolyzed water hydrogen storage unit and the gas-steam combined cycle unit, and the peak shaving system applies the solid oxide electrolyzed water technology to the gas-steam combined cycle generator unit, and achieves the purpose of peak shaving through the links of energy storage and hydrogen-electric coupling.

Disclosure of utility model

The application aims to provide a peak shaving system for coupling electrolyzed water hydrogen storage and a gas-steam combined cycle unit, which is used for applying a solid oxide electrolyzed water technology to the gas-steam combined cycle generator unit and achieving the purpose of peak shaving through an energy storage and hydrogen-electricity coupling link.

The application provides a peak shaving system for coupling an electrolyzed water hydrogen storage unit and a gas steam combined cycle unit, which comprises the following components: the device comprises a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit and a solid oxide electrolytic water hydrogen production unit; wherein the heat exchange unit comprises an electric heater and a heat exchanger,

The waste heat boiler power generation unit is used for receiving a first part of gas turbine exhaust gas with a first temperature discharged by the gas turbine power generation unit and providing a first part of steam turbine exhaust gas with a second temperature for the heat exchanger; the electric heater is configured to receive a second portion of the gas turbine exhaust gas having a first temperature exiting the gas turbine power generation unit and reheat the second portion of the gas turbine exhaust gas to provide a third gas turbine exhaust gas having a third temperature to the heat exchanger, the heat exchanger configured to exchange heat the first portion of the steam turbine exhaust gas with the third gas turbine exhaust gas and provide water vapor to be electrolyzed to the solid oxide water electrolysis hydrogen production unit at a temperature required by the solid oxide water electrolysis hydrogen production unit.

In another preferred embodiment, the water vapor to be electrolyzed is in a gaseous state.

In another preferred embodiment, the second temperature is less than the first temperature.

In another preferred embodiment, the third temperature is greater than the second temperature and greater than the first temperature.

In another preferred embodiment, the first portion of the gas turbine exhaust, the second portion of the gas turbine exhaust, and the third gas turbine exhaust are all flue gases, and the flue gases are gaseous.

In another preferred embodiment, the first portion of the steam turbine exhaust is steam, the steam being a mixture of a gaseous state and a liquid state.

In another preferred embodiment, the heat exchange unit is located downstream of the gas turbine power generation unit.

In another preferred embodiment, the heat exchange unit is located between the gas turbine power generation unit and the waste heat boiler power generation unit.

In another preferred embodiment, the heat exchanger has a first passage configured to receive the first portion of steam turbine exhaust and a second passage configured to receive the third gas turbine exhaust.

In another preferred embodiment, the solid oxide water electrolysis hydrogen production unit is in fluid communication with the first channel of the heat exchanger.

In another preferred embodiment, the system further comprises a hydrogen storage unit configured to receive and store hydrogen electrolyzed by the solid oxide water electrolysis hydrogen production unit, the hydrogen storage unit being configured to provide the stored hydrogen as fuel to the gas turbine power generation unit when the electrical load is high.

In another preferred embodiment, the hydrogen storage unit is further configured to generate electricity using stored hydrogen gas.

In another preferred embodiment, the gas turbine power generation unit includes a compressor, a combustor, a turbine, and a first generator.

In another preferred embodiment, the compressor is configured to compress air and provide compressed air to the combustion chamber, and the combustion chamber is configured to receive natural gas and to combust the received natural gas with the compressed air, thereby driving the turbine to perform work and thereby driving the first generator to generate electricity.

In another preferred embodiment, the combustion chamber is also in fluid communication with the hydrogen storage unit.

In another preferred example, the waste heat boiler power generation unit comprises a boiler, a steam turbine, a condenser, a condensate pump and a second power generator.

In another preferred embodiment, the inlet of the boiler is in fluid communication with the gas turbine power generation unit exhaust and is configured to receive the first portion of gas turbine exhaust such that the first portion of gas turbine exhaust heats water within the boiler drum to provide water vapor to the turbine to drive the turbine to produce work to produce power from the second generator.

In another preferred embodiment, the outlet of the turbine is in fluid communication with the heat exchanger and the condenser.

In another preferred embodiment, the condenser is located downstream of the steam turbine, receives a second portion of the steam turbine exhaust steam from the steam turbine, and is configured to cool the received second portion of the steam turbine exhaust steam into condensate, which is provided to the boiler by the condensate pump located downstream of the condenser.

In another preferred embodiment, the boiler is located downstream of the condensate pump.

In another preferred embodiment, the boiler is also in communication with the heat exchanger to receive a fourth gas turbine exhaust gas having a temperature exiting from the second passage of the heat exchanger.

In another preferred embodiment, the hydrogen storage unit comprises a hydrogen compressor in fluid communication with the solid oxide water electrolysis hydrogen production unit, a hydrogen reservoir downstream of the hydrogen compressor, and an outlet regulator valve downstream of the hydrogen reservoir.

In another preferred embodiment, the outlet regulator valve is in fluid communication with the gas turbine power generation unit.

In another preferred embodiment, the peaking train further includes an expander and a third generator, wherein the expander is located downstream of the outlet regulator valve, and an outlet of the expander is in fluid communication with the gas turbine power generation unit.

In another preferred embodiment, the combustion chamber is in fluid connection with the outlet regulator valve.

In another preferred embodiment, the combustion chamber is in fluid communication with an expander of the hydrogen storage unit.

In another preferred example, the solid oxide water electrolysis hydrogen production unit includes an electrolysis electrode, a water electrolysis tank, and an ac-dc converter.

In another preferred embodiment, the water electrolyzer is in communication with the first passageway of the heat exchanger and is configured to receive water vapor to be electrolyzed at a temperature desired for the solid oxide water electrolysis hydrogen unit.

In another preferred embodiment, the water electrolysis cell is also in communication with a compressor of the gas turbine power generation unit and provides electrolyzed oxygen to the compressor.

In another preferred embodiment, the plant power is converted into direct current required for water electrolysis by the alternating current-direct current converter.

The numerous technical features described in the description of the present application are distributed among the various technical solutions, which can make the description too lengthy if all possible combinations of technical features of the present application (i.e., technical solutions) are to be listed. In order to avoid this problem, the technical features disclosed in the above summary of the application, the technical features disclosed in the following embodiments and examples, and the technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (these technical solutions are regarded as already described in the present specification) unless such a combination of technical features is technically impossible. For example, in one example, feature a+b+c is disclosed, in another example, feature a+b+d+e is disclosed, and features C and D are equivalent technical means that perform the same function, technically only by alternative use, and may not be adopted simultaneously, feature E may be technically combined with feature C, and then the solution of a+b+c+d should not be considered as already described because of technical impossibility, and the solution of a+b+c+e should be considered as already described.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings described below are merely examples of embodiments of the present utility model and that other embodiments may be made by those skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a peaking system coupled to a combined cycle of electrolyzed water hydrogen storage and gas steam in accordance with embodiments of the present application.

In the drawings, the marks are as follows:

1-compressor

2-Combustion chamber

3-Turbine

4-Electric heater

5-Plate heat exchanger

6-Waste heat boiler

7-Steam turbine

8-Condenser

9-Condensate pump

10-Water-splitting tank

11-Hydrogen compressor

12-Hydrogen storage Container

13-Outlet regulating valve

14-Expansion machine

Detailed Description

Through extensive and intensive research, the inventor develops a peak regulation system for coupling the electrolyzed water hydrogen storage unit and the gas steam combined cycle unit for the first time, and the peak regulation system can apply the solid oxide electrolyzed water technology to the gas steam combined cycle unit by arranging a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit, a solid oxide electrolyzed water hydrogen production unit and a hydrogen energy storage unit, and achieves the purpose of peak regulation through an energy storage and hydrogen-electric coupling link. The peak regulation system utilizes the flue gas exhausted by the gas turbine to heat the exhaust steam of the steam turbine, solves the problem of water source and also solves the problem of high temperature environment required by the electrolytic ring, specifically utilizes the exhaust gas of the gas turbine as energy source to heat the steam exhausted by the low-pressure exhaust cylinder of the steam turbine, has the initial temperature of the steam, avoids the extra energy consumption in the process of heating water to steam, and the flue gas exhausted by the gas turbine has higher temperature, so that the temperature of the flue gas is easily raised to the temperature of hydrogen production by solid oxide electrolysis water in an electric heating mode, and the process of heating water with a large amount of electricity consumption is omitted.

Terminology

As used herein, "connected" and "connected" are used interchangeably.

As used herein, "waste heat boiler" and "boiler" are used interchangeably.

It should be noted that in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, and two cases are included: the act is performed solely on the basis of the element and is performed on the basis of the element and other elements. Multiple, etc. expressions include 2, 2 times, 2, and 2 or more, 2 or more times, 2 or more.

In the present utility model, all directional indications (such as up, down, left, right, front, rear, etc.) are merely used to explain the relative positional relationship, movement conditions, etc. between the components under a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.

The application has at least one of the following advantages

(A) According to the peak regulation system for the coupling of the electrolyzed water hydrogen storage and gas steam combined cycle unit, the novel technology of solid oxide electrolyzed water is used on the gas steam combined cycle generator unit, and the purpose of peak regulation is achieved through an energy storage and hydrogen-electric coupling link;

Optionally, (b) the peak shaving system coupled with the electrolytic water hydrogen storage and gas steam combined cycle unit provides the required electrolytic water with ultra-high temperature for producing hydrogen for solid oxide electrolytic water through the gas steam combined cycle unit; namely, steam turbine exhaust steam is used as a water source of the electrolyzed water, and exhaust gas of the gas turbine is used for heating the steam, and the steam and the exhaust gas supplement each other to provide necessary conditions for reaching the temperature required by the electrolyzed water of the solid oxide, so that the energy utilization rate is improved; the problem of additional supplement of electrolytic water is solved, the exhaust steam of the steam turbine is used as an initial water source, and the water recycling device has the characteristic of water recycling;

Optionally, (c) the peak shaving system of the application utilizes the solid oxide electrolysis water technology, on one hand, the problems of low hydrogen production efficiency and environmental pollution caused by alkali liquor in the electrolysis of water by using alkaline solution can be avoided; on the other hand, the problem of high cost of using noble metal catalyst for water electrolysis by using proton exchange membrane can be avoided;

Optionally, (d) the peak shaving system coupled with the electrolyzed water hydrogen storage and gas steam combined cycle unit of the application uses the exhaust gas of the gas turbine as energy to heat the steam exhausted from the low pressure exhaust cylinder of the gas turbine, and has the following advantages: on one hand, the steam has an initial temperature, and the process of heating water to steam is avoided from consuming extra energy; on the other hand, the flue gas exhausted by the gas turbine has higher temperature, and the temperature of the flue gas can be easily increased to the temperature of hydrogen production by solid oxide electrolysis water in an electric heating mode, so that a great amount of electricity consumption and water heating processes are omitted;

Optionally, (e) in the aspect of energy storage, the peak shaving system coupled with the electrolytic water hydrogen storage and gas steam combined cycle unit compresses hydrogen generated by electrolytic water through a gas compressor, stores the compressed gas in a container, and can release the hydrogen stored in the container (hydrogen storage container) when fuel is needed to be supplemented or higher power generation load is needed to be driven;

Optionally, (f) the peak shaving system of the present application can compress and store the generated hydrogen when the power load is low; when the power load is high, on one hand, the stored hydrogen is released through the regulating valve to drive the expander to rotate for power generation; on the other hand, the released hydrogen is used as fuel to be sent into a combustion chamber to be used as fuel for supplying, so that the power generation efficiency is improved;

Optionally, (g) oxygen generated by the peak shaving system in the water electrolysis hydrogen production process is fed into the inlet of the air compressor in real time, so that the concentration of oxygen in the combustion reaction is improved, and the combustion efficiency is improved.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be understood by those skilled in the art that the claimed application may be practiced without these specific details and with various changes and modifications from the embodiments that follow.

Peak regulating system for coupling electrolytic water hydrogen storage and gas steam combined cycle unit

Referring to fig. 1, the peak shaving system of the application, which is coupled with an electrolyzed water hydrogen storage and gas steam combined cycle unit, comprises: the device comprises a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit, a solid oxide electrolyzed water hydrogen production unit and a hydrogen energy storage unit; wherein the heat exchange unit comprises an electric heater 4 and a heat exchanger 5,

The exhaust heat boiler power generation unit is used for receiving a first part of gas turbine exhaust gas with a first temperature discharged by the gas turbine power generation unit and providing a first part of steam turbine exhaust gas with a second temperature for the heat exchanger 5; the electric heater 4 is configured to receive a second portion of the gas turbine exhaust gas having the first temperature of the gas turbine power generation unit and reheat the second portion of the gas turbine exhaust gas to provide a third gas turbine exhaust gas having a third temperature to the heat exchanger 5, the heat exchanger 5 being configured to exchange heat between the first portion of the steam turbine exhaust gas and the third gas turbine exhaust gas and to provide water vapor to be electrolyzed at a temperature required by the solid oxide water electrolysis hydrogen production unit to provide an initial water source for the solid oxide water electrolysis hydrogen production unit, and having the characteristic of water recycling. In one embodiment, the second temperature is less than the first temperature. In an embodiment, the third temperature is greater than the first temperature and greater than the second temperature. In one embodiment, the solid oxide water electrolysis hydrogen production unit requires a temperature between 700 ℃ and 850 ℃. In one embodiment, the first portion of the gas turbine exhaust, the second portion of the gas turbine exhaust, and the third gas turbine exhaust are flue gases that are gaseous, and the first portion of the steam turbine exhaust is steam that is a mixture of gaseous and liquid. In one embodiment, the water vapor to be electrolyzed is in a gaseous state.

Preferably, the heat exchange unit is located downstream of the gas turbine power generation unit. Preferably, the heat exchange unit is located between the gas turbine power generation unit and the waste heat boiler power generation unit, and the solid oxide electrolyzed water hydrogen production unit and the hydrogen energy storage unit are arranged on the side surfaces of the gas turbine power generation unit, the heat exchange unit and the waste heat boiler power generation unit, so that the structure arrangement is compact, and the fluid flow in the whole system operation process is smooth.

In an embodiment, the exhaust outlet of the gas turbine power generation unit is connected to the heat exchange unit and the exhaust heat boiler power generation unit, wherein the exhaust heat boiler power generation unit receives a first portion of the gas turbine exhaust gas having a first temperature and the electric heater 4 of the heat exchange unit receives a second portion of the gas turbine exhaust gas having the first temperature.

In an embodiment, the heat exchanger 5 has a first passage configured to receive the first portion of steam turbine exhaust and a second passage configured to receive the third gas turbine exhaust. The solid oxide water electrolysis hydrogen production unit is in fluid communication with the first channel of the heat exchanger 5, and receives water vapor to be electrolyzed at a temperature required by the solid oxide water electrolysis hydrogen production unit flowing out of the first channel of the heat exchanger 5.

In one embodiment, the gas turbine power generation unit includes a compressor 1, a combustor 2, a turbine 3, and a first generator. The compressor 1 is configured to compress air and provide compressed air to the combustion chamber 2, and the combustion chamber 2 is configured to receive natural gas and burn the received natural gas and compressed air, so as to drive the turbine 3 to do work and drive the first generator to generate electricity. Preferably, the combustion chamber 2 is further in fluid communication with the hydrogen storage unit, and receives the hydrogen stored in the hydrogen storage unit, and when the fuel needs to be replenished or a higher power generation load needs to be driven, the hydrogen stored in the hydrogen storage unit is released to the combustion chamber 2, so that the combustion efficiency is improved, and the peak shaving purpose is achieved.

In an embodiment, the waste heat boiler power generation unit comprises a boiler 6, a steam turbine 7, a condenser 8, a condensate pump 9 and a second power generator. The inlet of the boiler 6 is in fluid communication with the gas turbine power generation unit exhaust and is configured to receive the first portion of gas turbine exhaust such that the first portion of gas turbine exhaust heats water in the boiler 6 drum to provide steam to the turbine 7 to drive the turbine 7 to perform work to drive the second generator to generate power.

Preferably, the outlet of the turbine 7 is in fluid communication with the heat exchanger 5 and the condenser 8, the boiler 6 being located downstream of the condensate pump 9. The first channel of the heat exchanger 5 is configured to receive the first part of steam turbine exhaust steam, the condenser 8 is located at the downstream of the steam turbine 7 and receives the second part of steam turbine exhaust steam discharged by the steam turbine 7, the condenser 8 is configured to cool the received second part of steam turbine exhaust steam into condensate, and the condensate is provided to the boiler 6 through the condensate pump 9 located at the downstream of the condenser 8, so that the water recycling feature is provided. Preferably, the boiler 6 is also in communication with the heat exchanger 5, so as to receive a fourth gas turbine exhaust gas having a temperature flowing from the second passage of the heat exchanger 5, which fourth gas turbine exhaust gas is usable for heating water in the boiler 6 drum.

In one embodiment, the solid oxide water electrolysis hydrogen production unit comprises electrolysis electrodes, a water electrolysis tank 10 and an alternating current-direct current converter, and plant power is converted into direct current required by electrolysis water through the alternating current-direct current converter. The water electrolysis tank 10 is communicated with the first channel of the heat exchanger 5 and is used for receiving water vapor to be electrolyzed at a temperature required by the solid oxide water electrolysis hydrogen production unit.

Preferably, the water electrolysis tank 10 is also communicated with the gas compressor 1 of the gas turbine power generation unit, and electrolytic oxygen is provided for the gas compressor 1, so that the full utilization of energy is realized.

In an embodiment, the hydrogen storage unit is configured to receive and store hydrogen electrolyzed by the solid oxide electrolyzed water producing unit, the hydrogen storage unit being configured to provide the stored hydrogen as fuel to the gas turbine power generation unit when the electrical load is high. Preferably, the hydrogen storage unit is further configured to generate electricity using stored hydrogen gas.

In an embodiment, the hydrogen storage unit comprises a hydrogen compressor 11, a hydrogen reservoir 12, and an outlet regulator valve 13, wherein the hydrogen compressor 11 is in fluid communication with the solid oxide water electrolysis hydrogen production unit, the hydrogen reservoir 12 is located downstream of the hydrogen compressor 11, and the outlet regulator valve 13 is located downstream of the hydrogen reservoir 12. Preferably, the outlet regulator valve 13 is in fluid communication with the combustion chamber 2 of the gas turbine power generation unit, providing the combustion chamber 2 with stored hydrogen for peak shaving purposes when the electrical load is high. Preferably, the peak shaving system further comprises an expander 14 and a third generator, the expander 14 is located downstream of the outlet regulating valve 13, and the outlet of the expander 14 is in fluid communication with the combustion chamber 2 of the gas turbine power generation unit, so that high-pressure hydrogen enters the fuel inlet of the gas turbine and simultaneously drives the expander to rotate so as to generate electricity, and the energy utilization rate is improved.

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

Examples

Referring to fig. 1, the application provides a peak shaving system for coupling an electrolyzed water hydrogen storage unit and a gas steam combined cycle unit.

The peak shaving system comprises four parts, namely a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit, an electrolyzed water hydrogen production unit and a hydrogen energy storage unit.

The gas turbine power generation unit comprises a compressor 1, a combustion chamber 2, a turbine 3 and a first generator. The air compressor compresses air, the compressed air is sent into the combustion chamber to chemically react with natural gas, and high-temperature gas is generated to drive the turbine to do work so as to drive the generator to generate electricity. The flue gas outlet of the gas turbine power generation unit is respectively connected with the boiler 6 of the waste heat boiler power generation unit and the inlet of the electric heater 4 of the heat exchange unit, wherein most of flue gas (namely, a first part of gas turbine exhaust gas with a first temperature) enters the waste heat boiler 6 to heat water in the steam drum, so that high-temperature and high-pressure steam is generated to drive the steam turbine 7 to do work to drive the second generator to generate power, and a part of flue gas (namely, a second part of gas turbine exhaust gas with the first temperature) enters the electric heater 4 to be reheated. The gas turbine power generation unit is used as a core unit and is connected with the other three parts, the gas turbine power generation unit provides high-temperature flue gas (namely high-temperature gas turbine exhaust) for the heat exchange unit and the waste heat boiler power generation unit, and the hydrogen energy storage unit and the electrolyzed water hydrogen production unit send hydrogen and oxygen generated by electrolyzed water into the gas compressor 1 and the combustion chamber 2 of the gas turbine power generation unit to participate in combustion reaction.

The waste heat boiler power generation unit comprises a waste heat boiler 6, a steam turbine 7, a condenser 8, a condensate pump 9 and a second generator. The flue gas exhausted by the gas turbine power generation unit (namely, the exhaust gas of the second part of the gas turbine with the first temperature) heats water in a steam drum in the waste heat boiler 6, high-temperature and high-pressure steam is generated to push the steam turbine 7 to do work, the exhaust gas after doing work is exhausted along with the outlet of the low-pressure cylinder, enters the condenser 8 to be cooled into condensed water, the condensed water is pumped back to the boiler 6 again through the condensed water pump 9 to be used as a steam-water cycle, namely, the exhaust gas of the second part of the gas turbine enters the condenser 8 to be cooled into condensed water, and the condensed water is pumped back to the boiler 6 again through the condensed water pump 9. In addition, the outlet end of the heat exchanger 5 (the outlet end of the second channel) in the heat exchange unit is connected with the waste heat boiler 6, and the flue gas after heat exchange (i.e. the exhaust gas of the fourth gas turbine) still has a higher temperature and returns to the hearth to heat the water in the steam drum.

The heat exchange unit comprises an electric heater 4 and a plate heat exchanger 5. The electric heater 4 extracts part of flue gas at a flue gas outlet of the gas turbine generating unit (namely, the exhaust gas of the second part of the gas turbine with the first temperature) to be electrically reheated to obtain the exhaust gas of the third gas turbine with the third temperature, the exhaust gas of the third gas turbine with the third temperature is sent to an inlet end of the second channel of the heat exchanger 5, part of steam at a low-pressure exhaust gas outlet of the waste heat boiler generating unit turbine 7 (namely, the exhaust gas of the first part of the gas turbine) is extracted by the heat exchanger 5 and sent to an inlet end of the first channel of the heat exchanger, and the steam (namely, the exhaust gas of the first part of the gas turbine) absorbs heat through the exhaust gas of the third gas turbine with the third temperature in the heat exchanger 5 to generate high-temperature steam (namely, the steam to be electrolyzed at the temperature required by the solid oxide electrolyzed water hydrogen generating unit). Wherein the third temperature is greater than the first temperature and the second temperature.

The electrolytic water hydrogen production unit comprises an electrolytic electrode, a water electrolysis tank 10 and an alternating current-direct current converter. Direct current, the water source required for water electrolysis and higher temperature are three elements of solid oxidation diagram water electrolysis hydrogen production. The power for the factories is converted into direct current required by electrolysis water through an alternating current-direct current converter, the water source of the electrolysis water and the high-temperature environment required during the reaction, and the high-temperature steam flowing out from the outlet of the first channel of the heat exchange unit plate type heat exchanger 5 actually completes the water source heating process. Under the action of direct current, high-temperature steam generates electrolytic reaction in the water electrolyzer 10, hydrogen generated by a cathode and oxygen generated by an anode are respectively sent to an inlet of a hydrogen compressor 11 of the hydrogen energy storage unit and an inlet of a gas compressor 1 of the gas turbine power generation unit, and oxygen generated by electrolysis of water can be used as a part of compressed air to enter the gas compressor 1, so that the oxygen concentration in chemical reaction is improved, and the combustion efficiency is improved.

The hydrogen storage unit includes a hydrogen compressor 11, a hydrogen storage vessel 12, an outlet regulator valve 13, an expander 14, and a generator. The hydrogen generated by the electrolytic water hydrogen production unit is compressed to the hydrogen storage container 12 by the hydrogen compressor 11 for storage, and when the power generation amount needs to be increased for peak regulation, the hydrogen stored in the container can be used as supplementary fuel to be sent to the fuel inlet of the gas turbine power generation unit through the outlet regulating valve 13 at the downstream of the hydrogen storage container 12, so that the power generation amount is increased.

It can be seen that the solid oxide electrolysis water and the gas steam combined cycle generator set are very matched, and exhaust steam of the steam turbine is heated by fully utilizing tail flue gas of the gas turbine as a heat source, so that the problem of providing a water source of the electrolysis water is solved, and the problem of severe conditions requiring high temperature when the solid oxide electrolysis water is utilized is solved. In addition, the electrolyzed hydrogen can be stored as reserve energy, and released when peak regulation is needed; oxygen is fed into the gas compressor in real time, so that the oxygen concentration in the chemical reaction is improved, and the combustion efficiency is improved. The application fully embodies the concept of double carbon and provides a brand new peak regulation idea.

All references mentioned in this disclosure are to be considered as being included in the disclosure of the application in its entirety so that modifications may be made as necessary. Further, it is understood that various changes or modifications of the present application may be made by those skilled in the art after reading the above disclosure, and such equivalents are intended to fall within the scope of the application as claimed.

Claims (10)

1. The utility model provides a peak shaver system that electrolysis water stores up hydrogen and gas steam combined cycle unit coupling which characterized in that includes: the device comprises a gas turbine power generation unit, a waste heat boiler power generation unit, a heat exchange unit and a solid oxide electrolytic water hydrogen production unit; wherein the heat exchange unit comprises an electric heater (4) and a heat exchanger (5),

The waste heat boiler power generation unit is used for receiving a first part of gas turbine exhaust gas with a first temperature discharged by the gas turbine power generation unit and providing a first part of steam turbine exhaust gas with a second temperature for the heat exchanger (5); the electric heater (4) is used for receiving a second part of gas turbine exhaust gas with a first temperature, which is discharged by the gas turbine power generation unit, and reheating the second part of gas turbine exhaust gas so as to provide a third gas turbine exhaust gas with a third temperature to the heat exchanger (5), and the heat exchanger (5) is configured to exchange heat between the first part of steam turbine exhaust gas and the third gas turbine exhaust gas and provide water vapor to be electrolyzed with a temperature required by the solid oxide water electrolysis hydrogen generation unit to the solid oxide water electrolysis hydrogen generation unit.

2. The peaking system of claim 1, wherein the heat exchanger (5) has a first channel configured to receive the first portion of the steam turbine exhaust and a second channel configured to receive the third gas turbine exhaust.

3. Peak shaver system according to claim 2, wherein the solid oxide water electrolysis hydrogen production unit is in fluid communication with the first channel of the heat exchanger (5).

4. The peak shaving system of claim 3, further comprising a hydrogen storage unit configured to receive and store hydrogen electrolyzed by the solid oxide water electrolysis hydrogen production unit, the hydrogen storage unit configured to provide the stored hydrogen as fuel to the gas turbine power generation unit when the electrical load is high.

5. The peak shaver system according to claim 4, wherein the gas turbine power generation unit comprises a compressor (1), a combustion chamber (2), a turbine (3) and a first generator.

6. Peak shaver system according to claim 5, characterized in that the waste heat boiler power generation unit comprises a boiler (6), a steam turbine (7), a condenser (8), a condensate pump (9) and a second generator.

7. The peak shaver system according to claim 6, wherein the inlet of the boiler (6) is in fluid communication with the gas turbine power generation unit exhaust outlet and is adapted to receive the first portion of gas turbine exhaust gas such that the first portion of gas turbine exhaust gas heats water in the boiler (6) drum, thereby providing steam to the steam turbine (7) to drive the steam turbine (7) to perform work to generate power from the second generator.

8. Peak shaver system according to claim 7, wherein the outlet of the steam turbine (7) is in fluid communication with the heat exchanger (5) and the condenser (8).

9. Peak shaver system according to claim 8, wherein the condenser (8) is located downstream of the steam turbine (7), receives a second part of the steam turbine exhaust steam discharged by the steam turbine (7), the condenser (8) being configured to cool the received second part of the steam turbine exhaust steam into condensate, which condensate is provided to the boiler (6) by the condensate pump (9) located downstream of the condenser (8).

10. The peak shaving system according to claim 9, wherein the hydrogen storage unit comprises a hydrogen compressor (11), a hydrogen reservoir (12), and an outlet regulator valve (13), wherein the hydrogen compressor (11) is in fluid communication with the solid oxide water electrolysis hydrogen production unit, the hydrogen reservoir (12) is located downstream of the hydrogen compressor (11), and the outlet regulator valve (13) is located downstream of the hydrogen reservoir (12).