A kind of electric hydrogen salt trigeneration system and its working method

Abstract

The present invention relates to the field of hydrogen production by electrolysis of water, and specifically to an electric hydrogen salt trigeneration system and a working method thereof. The electric hydrogen salt trigeneration system comprises: a hydrogen production module, a gas turbine combined cycle module, a reverse osmosis seawater desalination module and a salt production module; the hydrogen production module comprises: an electrolytic hydrogen production tank, a hydrogen storage tank and a preheater; the gas turbine combined cycle module comprises: a compressor, a combustion chamber, a steam turbine, and a generator; the salt production module comprises: a thermal salt production device; the reverse osmosis seawater desalination module comprises: a reverse osmosis seawater desalination device. Compared with traditional hydrogen production and salt production processes, this system has the advantages of high integration, electric hydrogen salt trigeneration, energy saving and environmental protection. Compared with traditional hydrogen production processes, this system preheats the electrolyte by medium and low temperature steam, which solves the problem of difficult cold start of the hydrogen production device. Compared with traditional salt production processes, this process greatly improves the salt production efficiency and is pollution-free and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the field of hydrogen production by electrolysis of water, and in particular to an electric hydrogen salt trigeneration system and a working method thereof. Background Art

[0002] Among many types of energy, hydrogen fuel stands out with its remarkable characteristics of high energy density and becomes a clean and efficient form of energy. It not only has the potential to act as an energy carrier, and can directly replace traditional fuels such as gasoline and diesel for combustion, thereby providing power support for various energy application scenarios, but also occupies an important position in the industrial field and is one of the indispensable industrial gases. The current mainstream hydrogen production methods, such as fossil fuel reforming hydrogen production, although the technology is relatively mature, still rely on limited fossil resources and have carbon emission problems; water electrolysis hydrogen production is clean, but due to factors such as high energy consumption, its large-scale promotion and application are limited. Therefore, the development of an innovative, efficient and environmentally friendly hydrogen production technology is of vital practical significance for promoting the rapid development of the hydrogen energy industry, accelerating the transformation of the global energy structure, and achieving sustainable development goals. Salt, as an important basic chemical raw material and daily necessity, is widely used in many fields such as chemical industry, food processing, medicine, and agriculture. Traditional salt production methods, such as seawater salting and salt well mining, can meet the basic needs of the market to a certain extent, but these methods are often limited by natural conditions, have low production efficiency, and the purity of the salt products produced is difficult to further improve. The impurity content is relatively high and cannot meet the special requirements of some high-end industries for high-purity salt. In addition, the traditional salt production process also has certain limitations in resource utilization efficiency, which will cause the waste of some salt resources and potential impacts on the surrounding environment, such as land resource occupation and brine discharge.

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

[0004] This application proposes an electrolyzer + gas turbine (waste heat preheating) (exhaust gas salt production) combined with hydrogen production / hydrogen use to achieve a trigeneration process of electricity, hydrogen and salt that matches the new energy working conditions. Through a highly integrated process design, hydrogen production and salt production are combined to achieve efficient and environmentally friendly trigeneration of electricity, hydrogen and salt.

[0005] The present application provides an electric hydrogen salt trigeneration system, which comprises: a hydrogen production module, a gas turbine combined cycle module, a reverse osmosis seawater desalination module and a salt production module;

[0006] The hydrogen production module comprises: an electrolytic hydrogen production tank 2, a hydrogen storage tank 4 and a preheater 10;

[0007] The gas turbine combined cycle module includes: a compressor 5, a combustion chamber 6, a steam turbine 7, and a generator 8;

[0008] The salt making module comprises: a thermal salt making device 12;

[0009] The reverse osmosis seawater desalination module comprises: a reverse osmosis seawater desalination device 16;

[0010] The hydrogen outlet of the electrolytic hydrogen production tank 2 is connected to the inlet of the hydrogen storage tank 4, and the preheater 10 is configured to preheat the electrolyte of the electrolytic hydrogen production tank 2;

[0011] The inlet of the compressor 5 is communicated with the hydrogen storage tank 4, the outlet of the compressor 5 is communicated with the inlet of the combustion chamber 6, the outlet of the combustion chamber 6 is communicated with the inlet of the steam turbine 7, and the steam turbine 7 is connected to the generator 8 to drive the generator 8 to generate electricity;

[0012] The first medium-low temperature steam pipeline of the steam turbine 7 is connected to the steam inlet of the thermal salt making device 12 to provide steam for the thermal salt making device 12, and the second medium-low temperature steam pipeline of the steam turbine 7 is connected to the steam inlet of the preheater 10 to provide steam for the preheater 10;

[0013] The inlet of the reverse osmosis desalination device 16 is used to connect to the seawater supply pipeline, the reverse osmosis brine outlet of the reverse osmosis desalination device 16 is connected to the brine inlet of the thermal salt production device 12, and the fresh water outlet of the reverse osmosis desalination device 16 is connected to the fresh water inlet of the combustion chamber 6.

[0014] Preferably, the gas turbine combined cycle module further comprises: a condenser 17 ; the fresh water outlet of the reverse osmosis seawater desalination device 16 is connected to the fresh water inlet of the combustion chamber 6 through the condenser 17 .

[0015] Preferably, the steam outlet of the thermal salt production device 12 is connected to the fresh water inlet of the combustion chamber 6 through the condenser 17 .

[0016] Preferably, the electrolyte outlet of the electrolytic hydrogen production tank 2 is connected to the electrolyte inlet of the preheater 10 , and the electrolyte inlet of the electrolytic hydrogen production tank 2 is connected to the electrolyte outlet of the preheater 10 .

[0017] The second aspect of the present application provides a working method of an electric hydrogen salt trigeneration system, using the electric hydrogen salt trigeneration system described in the first aspect, wherein the hydrogen production module is used to obtain hydrogen, and the gas turbine combined cycle module is used to use the hydrogen as a fuel to burn to obtain heat for power generation and steam provision;

[0018] The salt production module is used to produce salt by utilizing the steam to evaporate the reverse osmosis brine;

[0019] The reverse osmosis seawater desalination module is used to separate seawater to obtain reverse osmosis brine and fresh water.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with the traditional hydrogen and salt production process, this system has the advantages of high integration, trigeneration of electricity, hydrogen and salt, energy saving and environmental protection. Compared with the traditional hydrogen production process, this system preheats the electrolyte through medium and low temperature steam, solving the problem of cold start difficulty of hydrogen production equipment. Compared with the traditional salt production process, this process greatly improves the salt production efficiency and is pollution-free and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the flow chart of this system.

[0023] List of reference numerals:

[0024] 1. Electrolyte, 2. Electrolytic hydrogen production tank, 3. Hydrogen, 4. Hydrogen storage tank, 5. Compressor, 6. Combustion chamber, 7. Steam turbine, 8. Generator, 9.1. First-line medium and low temperature steam, 9.2 Second-line medium and low temperature steam, 10. Preheater, 11. Sea salt, 12. Thermal salt production device, 13. Steam after heat exchange, 14. Seawater, 15. Reverse osmosis brine, 16. Reverse osmosis seawater desalination device, 17. Condenser, 18. Fresh water. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with embodiments.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] like Figure 1 As shown, the system comprises: a hydrogen production module, a gas turbine combined cycle module, a reverse osmosis seawater desalination module and a salt production module. Among them, the hydrogen production module comprises an electrolyte 1, an electrolytic hydrogen production tank 2, hydrogen 3, a hydrogen storage tank 4 and a preheater 10. The gas turbine combined cycle comprises a compressor 5, a combustion chamber 6, a steam turbine 7, a generator 8, a first-path medium and low temperature steam 9.1, a second-path medium and low temperature steam 9.2, a condenser 17 and fresh water 18. The salt production module comprises a thermal salt production device 12, sea salt 11 and steam after heat exchange 13. The reverse osmosis seawater desalination module comprises seawater 14, reverse osmosis brine RO brine 15 and a reverse osmosis seawater desalination device 16.

[0035] The working process of this system is as follows: When the system is running, in the hydrogen production module, the electrolyte 1 is preheated by the preheater 10 and then transported to the electrolytic hydrogen production tank 2 to carry out electrolysis reaction to generate hydrogen 3. The generated hydrogen 3 is temporarily stored in the hydrogen storage tank 4 for transition, then compressed in the compressor 5, and transported to the combustion chamber 6 for combustion reaction, providing an energy basis for the entire system. In the reverse osmosis seawater desalination module, seawater 14 is desalinated by the reverse osmosis seawater desalination device 16 to produce fresh water 18 and RO brine 15. Among them, the fresh water 18 is transported to the gas turbine combined cycle module as the circulating working fluid of the gas turbine combined cycle. The RO brine 15 is transported to the thermal salt production device 12 to exchange heat with the low-temperature steam 9.1 in the first path for evaporation. In the gas turbine combined cycle module, the fresh water 14 absorbs the heat released by the combustion of hydrogen 3 in the combustion chamber 6, absorbs heat and becomes a high-temperature and high-pressure steam state. The steam is introduced into the steam turbine 7 to drive the generator 8 to generate electricity, and two sections of medium and low temperature steam 9.1 and 9.2 are extracted from the steam turbine 7. Among them, the second medium and low temperature steam 9.2 is transported to the preheater 10 to preheat the electrolyte 1 to solve the cold start difficulty of electrolytic hydrogen production. The first medium and low temperature steam 9.1 is transported to the salt making module. In the salt making module, the first medium and low temperature steam 9.1 and the RO brine 15 undergo a heat exchange process, which promotes the RO brine 15 to evaporate to generate sea salt 11, and greatly improves the salt making efficiency of the existing salt making process. After the heat exchange, the steam 13 merges with the fresh water 18 produced by the reverse osmosis seawater desalination module, and then is condensed by the condenser 17 and transported back to the combustion chamber 6 to participate in the combustion reaction. This realizes the complete operation process cycle of the system.

[0036] This process combines hydrogen production with salt production through a highly integrated design to achieve efficient and environmentally friendly trigeneration of electricity, hydrogen and salt.

Claims

1. An electric hydrogen salt trigeneration system, characterized in that: The electricity-hydrogen-salt trigeneration system comprises: a hydrogen production module, a gas turbine combined cycle module, a reverse osmosis seawater desalination module and a salt production module; The hydrogen production module comprises: an electrolytic hydrogen production tank (2), a hydrogen storage tank (4) and a preheater (10); The gas turbine combined cycle module comprises: a compressor (5), a combustion chamber (6), a steam turbine (7), and a generator (8); The salt production module comprises: a thermal salt production device (12); The reverse osmosis seawater desalination module comprises: a reverse osmosis seawater desalination device (16); The hydrogen outlet of the electrolytic hydrogen production tank (2) is connected to the inlet of the hydrogen storage tank (4), and the preheater (10) is configured to preheat the electrolyte of the electrolytic hydrogen production tank (2); The inlet of the compressor (5) is communicated with the hydrogen storage tank (4), the outlet of the compressor (5) is communicated with the inlet of the combustion chamber (6), the outlet of the combustion chamber (6) is communicated with the inlet of the steam turbine (7), and the steam turbine (7) is connected to the generator (8) to drive the generator (8) to generate electricity; The first medium-low temperature steam pipeline of the steam turbine (7) is connected to the steam inlet of the thermal salt production device (12) to provide steam for the thermal salt production device (12), and the second medium-low temperature steam pipeline of the steam turbine (7) is connected to the steam inlet of the preheater (10) to provide steam for the preheater (10); The inlet of the reverse osmosis seawater desalination device (16) is used to be connected to a seawater supply pipeline, the reverse osmosis brine outlet of the reverse osmosis seawater desalination device (16) is connected to the brine inlet of the thermal salt production device (12), and the fresh water outlet of the reverse osmosis seawater desalination device (16) is connected to the fresh water inlet of the combustion chamber (6).

2. The electric hydrogen salt trigeneration system according to claim 1, characterized in that: The gas turbine combined cycle module further comprises: a condenser (17); the fresh water outlet of the reverse osmosis seawater desalination device (16) is connected to the fresh water inlet of the combustion chamber (6) through the condenser (17).

3. The electric hydrogen salt trigeneration system according to claim 1, characterized in that: The steam outlet of the thermal salt production device (12) is connected to the fresh water inlet of the combustion chamber (6) through the condenser (17).

4. The electric hydrogen salt trigeneration system according to claim 1, characterized in that: The electrolyte outlet of the electrolytic hydrogen production tank (2) is connected to the electrolyte inlet of the preheater (10), and the electrolyte inlet of the electrolytic hydrogen production tank (2) is connected to the electrolyte outlet of the preheater (10).

5. A working method of an electric hydrogen salt trigeneration system, characterized in that: Using the electric hydrogen salt trigeneration system described in the claim, the hydrogen production module is used to obtain hydrogen, and the gas turbine combined cycle module is used to use the hydrogen as a fuel to burn to obtain heat for power generation and steam provision; The salt production module is used to produce salt by utilizing the steam to evaporate the reverse osmosis brine; The reverse osmosis seawater desalination module is used to separate seawater to obtain reverse osmosis brine and fresh water.

Images