A combined cycle system of electrolysis hydrogen production and gas turbine

Abstract

The present invention belongs to the field of electrolytic hydrogen production, and specifically relates to an electrolytic hydrogen production-gas turbine combined cycle system. The electrolytic hydrogen production-gas turbine combined cycle system includes: a gas turbine combined cycle module and a steam extraction preheating hydrogen production module; the gas turbine combined cycle module includes: a gas turbine cycle module and a steam turbine cycle module; the steam extraction preheating hydrogen production module includes: a water electrolysis hydrogen production tank; the gas turbine cycle module is configured to generate electricity using the heat of fuel combustion and supply heat to the steam turbine cycle module; the steam turbine cycle module is configured to generate electricity using the heat supplied by the gas turbine combined cycle module and supply preheating steam to the water electrolysis hydrogen production tank of the steam extraction preheating hydrogen production module. The present application solves the problem of poor matching between the frequent start-stop conditions of the water electrolysis hydrogen production system and the fluctuation effect of new energy sources by using the steam extraction of the gas turbine combined cycle to quickly preheat the already cooled electrolyte in the water electrolysis hydrogen production tank.

Description

Technical Field

[0001] The invention belongs to the field of electrolytic hydrogen production, and in particular relates to an electrolytic hydrogen production-gas engine combined cycle system. Background Art

[0002] In recent years, hydrogen energy has attracted much attention in the field of energy utilization as an efficient and clean energy. Therefore, the technology of hydrogen production by water electrolysis has also achieved great development recently. Among them, the technology of using new energy to produce hydrogen by water electrolysis has broad application prospects. However, due to the volatility of electricity provided by new energy, there are often shutdown conditions in the water electrolysis hydrogen production system. Under shutdown conditions, the temperature of the electrolyte drops, and the heating time is long during cold start, especially in winter when the ambient temperature is low. This makes the frequent start and stop conditions of the water electrolysis hydrogen production system and the poor matching of the fluctuation effect of new energy become one of the obstacles to its development.

[0003] In order to solve the above problems, this application is proposed. Summary of the invention

[0004] The present invention proposes a rapid hot-start electrolysis hydrogen production-gas turbine combined cycle system that is adaptable to frequent starts and stops. The system uses the extraction steam of the gas turbine combined cycle to quickly preheat the cooled electrolyte, thereby achieving a rapid hot-start of the water electrolysis hydrogen production system after shutdown, thereby solving the problem of poor matching between the frequent start-stop conditions of the water electrolysis hydrogen production system and the fluctuation effects of new energy.

[0005] The present application discloses an electrolysis hydrogen production-gas engine combined cycle system, which comprises: a gas engine combined cycle module and a steam extraction preheating hydrogen production module;

[0006] Wherein, the gas turbine combined cycle module includes: a gas turbine cycle module and a steam turbine cycle module;

[0007] The steam extraction preheating hydrogen production module comprises: a water electrolysis hydrogen production tank 3-1;

[0008] The gas turbine cycle module is configured to generate electricity using heat from fuel combustion and to supply heat to the steam turbine cycle module;

[0009] The steam turbine cycle module is configured to generate electricity using the heat supplied by the gas turbine cycle module and to supply preheated steam to the water electrolysis hydrogen production tank 3 - 1 of the steam extraction preheating hydrogen production module.

[0010] Preferably, the extraction steam preheating hydrogen production module further includes: a circulation pump 3-2, a preheater 3-3, an extraction steam inlet check valve 3-4, and an extraction steam outlet check valve 3-5;

[0011] Wherein, the inlet of the extraction steam inlet check valve 3-4 is connected to the steam outlet of the steam turbine circulation module, and the outlet of the extraction steam inlet check valve 3-4 is connected to the steam side inlet of the preheater 3-3;

[0012] The steam side outlet of the preheater 3-3 is connected to the inlet of the extraction steam outlet check valve 3-5, and the outlet of the extraction steam outlet check valve 3-5 is connected to the steam turbine circulation module;

[0013] The electrolyte side inlet of the preheater 3-3 is connected to the electrolyte outlet of the water electrolysis hydrogen production tank 3-1, the electrolyte side outlet of the preheater 3-3 is connected to the inlet of the circulation pump 3-2, and the outlet of the circulation pump 3-2 is connected to the electrolyte inlet of the water electrolysis hydrogen production tank 3-1.

[0014] Preferably, the gas turbine cycle module comprises: a combustion chamber 1-2, a gas turbine 1-3 and a first generator 1-4;

[0015] The flue gas outlet of the combustion chamber 1-2 is connected to the inlet of the gas turbine 1-3, and the gas turbine 1-3 is connected to the first generator 1-4 so as to drive the first generator 1-4 to generate electricity.

[0016] Preferably, the gas turbine cycle module further comprises: a compressor 1-1;

[0017] The inlet of the compressor 1-1 is connected to an external air delivery pipe, the outlet of the compressor 1-1 is connected to the air inlet of the combustion chamber 1-2, and the gas turbine 1-3 is coaxially connected to the first generator 1-4 and the compressor 1-1 through a rotating shaft so as to drive the first generator 1-4 and the compressor 1-1 to work simultaneously.

[0018] Preferably, the steam turbine cycle includes: a waste heat boiler 2-1, a steam turbine 2-2, a second generator 2-3, a condenser 2-4 and a feed water pump 2-5;

[0019] The outlet of the gas turbine 1-3 is connected to the inlet of the flue gas side of the waste heat boiler 2-1, the outlet of the working medium side of the waste heat boiler 2-1 is connected to the inlet of the steam turbine 2-2, the steam turbine 2-2 is coaxially connected to the second generator 2-3 and the feed water pump 2-5 through a rotating shaft, the outlet of the steam turbine 2-2 is connected to the inlet of the working medium side of the condenser 2-4, the inlet and outlet of the cold source side of the condenser 2-4 are connected to external cooling water, the outlet of the working medium side of the condenser 2-4 is connected to the inlet of the feed water pump 2-5, and the outlet of the feed water pump 2-5 is connected to the inlet of the working medium side of the waste heat boiler 2-1;

[0020] The outlet of the steam turbine 2-2 is also connected to the inlet of the extraction steam inlet check valve 3-4.

[0021] The second aspect of the present application provides a working method of the electrolysis hydrogen production-gas engine combined cycle system of the first aspect, the working method comprising: a power generation working state with steam extraction preheating hydrogen production and a pure power generation working state without steam extraction preheating hydrogen production;

[0022] When using the power generation working state with extraction steam preheating hydrogen production:

[0023] The extraction steam inlet electric check valve 3-4 and the extraction steam outlet check valve 3-5 are both in an open state, at which time the gas turbine cycle module uses the heat of fuel combustion to generate electricity and supply heat to the steam turbine cycle module;

[0024] The steam turbine cycle module utilizes the heat supplied by the gas turbine cycle module to generate electricity and supply preheated steam to the water electrolysis hydrogen production tank 3-1 of the steam extraction preheating hydrogen production module;

[0025] When using the power generation working state without extraction steam preheating hydrogen production:

[0026] The extraction steam inlet electric check valve 3-4 and the extraction steam outlet check valve 3-5 are both in a closed state.

[0027] At this time, the gas turbine cycle module uses the heat of fuel combustion to generate electricity and supply heat to the steam turbine cycle module;

[0028] The steam turbine cycle module generates electricity using the heat supplied by the gas turbine cycle module.

[0029] Preferably, the extraction steam inlet check valve 3-4 is an extraction steam inlet electric check valve.

[0030] Preferably, the extraction steam outlet check valve 3-5 is an extraction steam outlet electric check valve.

[0031] The compressor is a gas compressor.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention provides a rapid hot start hydrogen electrolysis-gas engine combined cycle system that is adapted to frequent start and stop. By using the steam extraction of the gas engine combined cycle to quickly preheat the cooled electrolyte in the water electrolysis hydrogen production tank, the problem of poor matching between the frequent start and stop conditions of the water electrolysis hydrogen production system and the fluctuation effect of new energy is solved.

[0034] 2. Due to the frequent start-stop conditions of the water electrolysis hydrogen production system, the heat source required is intermittent heat supply and fast heat supply is expected. Therefore, how to provide such a heat source under energy-saving regulation is a problem.

[0035] In the present application, the system can be placed in a power generation working state with or without extraction steam preheating to produce hydrogen by conveniently controlling the closing of the extraction steam inlet check valve 3-4 and the extraction steam outlet check valve 3-5.

[0036] Therefore, when the new energy provides electrolysis power, the electrolyte needs to be quickly preheated, and at this time, the steam extraction inlet check valve 3-4 and the steam extraction outlet check valve 3-5 can be controlled to be open. When the electrolyte does not need to be preheated, for example, when the new energy cannot provide electrolysis power and the electrolysis is shut down, the steam extraction inlet check valve 3-4 and the steam extraction outlet check valve 3-5 can be closed. In the above two cases, the system's gas turbine combined cycle module can generate electricity synchronously without heat / energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the system structure.

[0038] List of reference numerals:

[0039] 1-1, compressor, 1-2, combustion chamber, 1-3, gas turbine, 1-4, first generator, 2-1, waste heat boiler, 2-2, steam turbine, 2-3, second generator, 2-4, condenser, 2-5, feed water pump, 3-1, water electrolysis hydrogen production tank, 3-2, circulating pump, 3-3, preheater, 3-4, extraction steam inlet check valve, 3-5, extraction steam outlet check valve. DETAILED DESCRIPTION

[0040] The present application is further described in detail below in conjunction with embodiments.

[0041] Those skilled in the art will appreciate that the following examples are only used to illustrate the present application and should not be considered to limit the scope of the present application. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0042] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "one", "an", "said" and "the" used herein may also include plural forms. In the description of the present application, unless otherwise specified, "plurality" means two or more. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be an intermediate element. In addition, the "connection" used here may include a wireless connection.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0048] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0049] Combine the following Figure 1 A specific implementation scheme is proposed to the present invention:

[0050] The present application proposes a rapid hot start electrolysis hydrogen production-gas turbine combined cycle system that is suitable for frequent start and stop. The system consists of a gas turbine combined cycle module and an extraction steam preheating hydrogen production module. The gas turbine combined cycle module is composed of a gas turbine cycle and a steam turbine cycle. Among them, the gas turbine cycle includes: a compressor 1-1, a combustion chamber 1-2, a gas turbine 1-3 and a first generator 1-4. The steam turbine cycle includes: a waste heat boiler 2-1, a steam turbine 2-2, a second generator 2-3, a condenser 2-4 and a feed water pump 2-5. The extraction steam preheating hydrogen production module includes: a water electrolysis hydrogen production tank 3-1, a circulating pump 3-2, a preheater 3-3, an extraction steam inlet electric check valve 3-4, and an extraction steam outlet electric check valve 3-5.

[0051] In the gas turbine cycle module: the inlet of the compressor 1-1 is connected to the external air delivery pipe. The outlet of the compressor 1-1 is connected to the air inlet of the combustion chamber 1-2. The combustion chamber 1-2 is equipped with fuel and a burner for ignition. The flue gas outlet of the combustion chamber 1-2 is connected to the inlet of the gas turbine 1-3. The gas turbine 1-3 is coaxially connected to the first generator 1-4 and the compressor 1-1 through a rotating shaft. The outlet of the gas turbine 1-3 is connected to the flue gas side inlet of the waste heat boiler 2-1. The flue gas side outlet of the waste heat boiler 2-1 is connected to the external atmosphere. The above forms a gas turbine cycle that uses flue gas as a working medium to generate electricity.

[0052] In the steam turbine cycle module, the outlet of the working medium side of the waste heat boiler 2-1 is connected to the inlet of the steam turbine 2-2. The steam turbine 2-2 is coaxially connected to the second generator 2-3 and the feed water pump 2-5 through a rotating shaft. The outlet of the steam turbine 2-2 is connected to the inlet of the working medium side of the condenser 2-4. The inlet and outlet of the cold source side of the condenser 2-4 are connected to external cooling water. The outlet of the working medium side of the condenser 2-4 is connected to the inlet of the feed water pump 2-5. The outlet of the feed water pump 2-5 is connected to the inlet of the working medium side of the waste heat boiler 2-1. The above forms a steam turbine cycle that uses steam as the working medium to generate electricity.

[0053] The gas turbine cycle module and the steam turbine cycle module together form a gas turbine combined cycle with the waste heat boiler 2-1 as the hub.

[0054] In the steam extraction preheating hydrogen production module: the inlet of the steam extraction inlet electric check valve 3-4 is connected to the outlet of the exhaust stage of the steam turbine 2-3. The outlet of the steam extraction inlet electric check valve 3-4 is connected to the steam side inlet of the preheater 3-3. The steam side outlet of the preheater 3-3 is connected to the inlet of the steam extraction outlet electric check valve 3-5. The outlet of the steam extraction outlet electric check valve 3-5 is connected to the working medium side inlet of the condenser 2-4. The electrolyte side inlet of the preheater 3-3 is connected to the electrolyte outlet of the water electrolysis hydrogen production tank 3-1. The electrolyte side outlet of the preheater 3-3 is connected to the inlet of the circulation pump 3-2. The outlet of the circulation pump 3-2 is connected to the electrolyte inlet of the water electrolysis hydrogen production tank 3-1. The above forms a steam extraction preheating hydrogen production module that uses steam turbine extraction to quickly preheat the electrolyte.

[0055] Combine the following Figure 1 The working method of the present invention is described. A fast hot start electrolysis hydrogen production-gas engine combined cycle system adapted to frequent start and stop, wherein the working states are divided into two types, namely, a power generation working state with steam extraction preheating hydrogen production and a pure power generation working state without steam extraction preheating hydrogen production.

[0056] When the power generation working state is with extraction steam preheating hydrogen production, the extraction steam inlet electric check valve 3-4 and the extraction steam outlet check valve 3-5 are both in the open state. After being compressed by the compressor 1-1, the air enters the combustion chamber 1-2 and mixes with the gas to burn to generate a large amount of high-temperature and high-pressure flue gas. After leaving the combustion chamber 1-2, the high-temperature and high-pressure flue gas enters the gas turbine 1-3 to expand and do work. The gas turbine 1-3 drives the first generator 1-4 through the rotating shaft to generate electricity, and also provides energy for the compressor 1-1. The flue gas pressure after the gas turbine 1-3 does work is greatly reduced but still has a high temperature. Then the flue gas enters the waste heat boiler 2-1 and passes through each heating surface in a certain order for heat exchange. The low-temperature and low-pressure flue gas after heat exchange is directly discharged from the waste heat boiler 2-1 into the atmosphere.

[0057] After the feed water is pressurized by the feed water pump 2-5, it enters the waste heat boiler 2-1 and exchanges heat with different heating surfaces to generate a large amount of high-temperature and high-pressure steam. After leaving the waste heat boiler 2-1, the steam enters the steam turbine 2-2 to expand and do work, and drives the second generator 2-3 to generate electricity through the rotating shaft, while providing energy for the feed water pump 2-5. In the steam turbine 2-2, the steam is divided into two parts. One part is completely expanded to become low-temperature and low-pressure exhaust steam, and then discharged from the steam turbine 2-2, and then enters the condenser 2-4 for condensation. The condensed feed water is then pressurized by the feed water pump 2-5 and recirculated. The other part of the steam is only partially expanded, and then as extraction steam, it enters the steam side of the preheater 3-3 through the extraction steam inlet electric check valve 3-4 to preheat the electrolyte coming out of the electrolytic water hydrogen production tank 3-1. The extraction steam after releasing heat leaves the preheater 3-3, and after passing through the extraction steam outlet electric check valve 3-5, it merges with the exhaust gas at the outlet of the steam turbine 2-2 and enters the condenser 2-4 for condensation.

[0058] In the pure power generation working state without extraction steam preheating hydrogen production, the extraction steam inlet electric check valve 3-4 and the extraction steam outlet check valve 3-5 are both in the closed state. The gas turbine combined cycle module performs normal power generation, and the extraction steam preheating hydrogen production module stops extraction steam preheating.

[0059] Furthermore, the extraction steam flow rate of the steam turbine 2-2 can be controlled by the extraction steam inlet electric check valve 3-4 and the extraction steam outlet check valve 3-5 to match the requirements of the extraction steam preheating hydrogen production module under different working conditions.

[0060] It should also be noted that all power-consuming components in the system can be driven by the electrical energy generated by the gas turbine combined cycle module.

Claims

1. An electrolysis hydrogen production-gas engine combined cycle system, characterized in that: The electrolysis hydrogen production-gas turbine combined cycle system comprises: a gas turbine combined cycle module and a steam extraction preheating hydrogen production module; Wherein, the gas turbine combined cycle module includes: a gas turbine cycle module and a steam turbine cycle module; The steam extraction preheating hydrogen production module comprises: a water electrolysis hydrogen production tank (3-1); The gas turbine cycle module is configured to generate electricity using heat from fuel combustion and to supply heat to the steam turbine cycle module; The steam turbine cycle module is configured to generate electricity using the heat supplied by the gas turbine cycle module and to supply preheated steam to the water electrolysis hydrogen production tank (3-1) of the steam extraction preheating hydrogen production module.

2. The electrolysis hydrogen production-gas engine combined cycle system according to claim 1, characterized in that: The steam extraction preheating hydrogen production module further includes: a circulation pump (3-2), a preheater (3-3), a steam extraction inlet check valve (3-4), and a steam extraction outlet check valve (3-5); The inlet of the extraction steam inlet check valve (3-4) is connected to the steam outlet of the steam turbine circulation module, and the outlet of the extraction steam inlet check valve (3-4) is connected to the steam side inlet of the preheater (3-3); The steam side outlet of the preheater (3-3) is connected to the inlet of the extraction steam outlet check valve (3-5), and the outlet of the extraction steam outlet check valve (3-5) is connected to the steam turbine circulation module; The electrolyte side inlet of the preheater (3-3) is connected to the electrolyte outlet of the water electrolysis hydrogen production tank (3-1), the electrolyte side outlet of the preheater (3-3) is connected to the inlet of the circulation pump (3-2), and the outlet of the circulation pump (3-2) is connected to the electrolyte inlet of the water electrolysis hydrogen production tank (3-1).

3. The electrolysis hydrogen production-gas engine combined cycle system according to claim 2, characterized in that: The gas turbine cycle module comprises: a combustion chamber (1-2), a gas turbine (1-3) and a first generator (1-4); The flue gas outlet of the combustion chamber (1-2) is connected to the inlet of the gas turbine (1-3), and the gas turbine (1-3) is connected to the first generator (1-4) so ​​as to drive the first generator (1-4) to generate electricity.

4. The electrolysis hydrogen production-gas engine combined cycle system according to claim 3, characterized in that: The gas turbine cycle module further comprises: a compressor (1-1); The inlet of the compressor (1-1) is connected to an external air delivery pipe, and the outlet of the compressor (1-1) is connected to the air inlet of the combustion chamber (1-2). The gas turbine (1-3) is coaxially connected to the first generator (1-4) and the compressor (1-1) via a rotating shaft so as to drive the first generator (1-4) and the compressor (1-1) to work simultaneously.

5. The electrolysis hydrogen production-gas engine combined cycle system according to claim 4, characterized in that: The steam turbine cycle comprises: a waste heat boiler (2-1), a steam turbine (2-2), a second generator (2-3), a condenser (2-4) and a feed water pump (2-5); The outlet of the gas turbine (1-3) is connected to the inlet of the flue gas side of the waste heat boiler (2-1), the outlet of the working medium side of the waste heat boiler (2-1) is connected to the inlet of the steam turbine (2-2), the steam turbine (2-2) is coaxially connected to the second generator (2-3) and the feed water pump (2-5) through a rotating shaft, the outlet of the steam turbine (2-2) is connected to the inlet of the working medium side of the condenser (2-4), the inlet and outlet of the cold source side of the condenser (2-4) are connected to external cooling water, the outlet of the working medium side of the condenser (2-4) is connected to the inlet of the feed water pump (2-5), and the outlet of the feed water pump (2-5) is connected to the inlet of the working medium side of the waste heat boiler (2-1); The outlet of the steam turbine (2-2) is also connected to the inlet of the extraction steam inlet check valve (3-4).

6. A method for operating the electrolysis hydrogen production-gas engine combined cycle system according to claim 2, characterized in that: The working method includes: a power generation working state with steam extraction preheating hydrogen production and a pure power generation working state without steam extraction preheating hydrogen production; When using the power generation working state with extraction steam preheating hydrogen production: The extraction steam inlet electric check valve (3-4) and the extraction steam outlet check valve (3-5) are both in an open state, at which time the gas turbine cycle module uses the heat of fuel combustion to generate electricity and supply heat to the steam turbine cycle module; The steam turbine cycle module utilizes the heat supplied by the gas turbine cycle module to generate electricity and supply preheated steam to the water electrolysis hydrogen production tank (3-1) of the steam extraction preheating hydrogen production module; When using the power generation working state without extraction steam preheating hydrogen production: The extraction steam inlet electric non-return valve (3-4) and the extraction steam outlet non-return valve (3-5) are both in a closed state. At this time, the gas turbine cycle module uses the heat from fuel combustion to generate electricity and supply heat to the steam turbine cycle module; The steam turbine cycle module generates electricity using the heat supplied by the gas turbine cycle module.

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