CN115057759B - A distributed integrated energy system integrating energy storage, hydrogen production and methanol production - Google Patents

Abstract

The application relates to a distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production, which comprises a pure water preparation system, an electrolyzed water hydrogen production system, a hydrogen storage system, a hydrogen fuel cell system, a carbon dioxide storage system, a carbon dioxide hydrogenation methanol production system, a methanol storage system, an electrochemical energy storage system, an energy storage inversion cabinet, an electrical cabinet, an operation cabinet, a temperature control system and a fire protection system. By combining electrochemical energy storage, hydrogen energy storage and methanol energy storage, a more flexible energy storage mode is realized, and the energy storage requirement with longer period and large capacity is met while the charge-discharge response speed is high. When the movable energy storage mode is oriented to distributed scenes such as new energy stations, the container type movable energy storage mode has higher adaptability.

Description

A distributed integrated energy system integrating energy storage, hydrogen production and methanol production

Technical Field

The present application belongs to the field of energy storage technology, and in particular, relates to a distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production.

Background technique

In order to better promote social progress and achieve sustainable development, clean energy production has gradually gained attention. Among them, the local consumption of clean energy is particularly important, which can improve the energy utilization efficiency of different regions and promote the steady development of the region.

The distributed integrated energy system is a method of energy development and utilization arranged on the user side. It has the characteristics of local utilization, clean and low-carbon, diversified interaction, flexibility and high efficiency. It is an indispensable and important part of the modern energy system.

my country is vigorously promoting the development of distributed energy, and adheres to the principle of developing both centralized and distributed energy, focusing on distributed energy utilization, and promoting the development of a high proportion of renewable energy. When the distributed energy generation load is inconsistent with the load required by the power grid, a distributed integrated energy system is required to regulate and absorb the power load through energy storage and other forms to achieve efficient use of energy. When facing distributed new energy sites, active distribution networks and other scenarios, a flexible and efficient distributed integrated energy system is needed to support it.

The patent application number CN202111339246.8 discloses a distributed integrated energy system for data centers, which proposes to use a waste heat utilization system and an energy storage battery device in combination, targeting the application scenarios of data centers, so that the waste heat generated by the data center can be effectively utilized, and the UPS battery can be effectively utilized, and the total power consumption of the data center can be reduced and electricity bills can be saved. However, the energy storage method of this invention is relatively single, and the application scenarios are relatively limited.

The patent application number CN202210043308.9 discloses a CHP and water source heat pump integrated energy system and its control method, which utilizes the workshop waste heat system to heat surrounding customers through heat pump heating. The CHP system is used as a backup heat source to perform load peak regulation. In addition, the CHP system + boiler can provide steam services to users. However, the present invention is mainly aimed at the storage and utilization of heat, and cannot absorb and support power loads.

The patent with application number CN202210183784.0 discloses an integrated energy system, scheduling method and scheduling system based on multi-energy complementarity, which is applied to the field of integrated energy scheduling technology. The integrated energy system includes a combined heat and power module, cooling equipment, heating equipment and an energy storage module; the combined heat and power module is used to utilize natural gas to supply electricity, and to recover the waste heat of the heat energy generated during power supply, and to provide heating and cooling respectively according to the waste heat recovery treatment; the cooling equipment is used to assist in cooling; the heating equipment is used to assist in heating; the energy storage module is used to charge and discharge energy, heat energy and cold energy. However, the invention occupies a large area and investment, and is not suitable for distributed energy scenarios.

Summary of the invention

The technical problem to be solved by the present invention is: to solve the problems of insufficient flexibility, low adaptability and poor surplus power consumption capacity of energy storage systems in the prior art, thereby providing a distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production.

The technical solution adopted by the present invention to solve the technical problem is: a distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production, including a pure water preparation system for preparing pure water, so that the raw water entering the pure water preparation system is separated into pure water and waste water, and the waste water can be discharged;

A water electrolysis hydrogen production system, wherein the water electrolysis hydrogen production system is connected to a pure water preparation system, pure water produced by the pure water preparation system is passed into the water electrolysis hydrogen production system, the pure water is separated into hydrogen and oxygen by electrolysis, and the hydrogen is passed into the hydrogen storage system;

A hydrogen storage system, which is connected to the water electrolysis hydrogen production system to store hydrogen produced in the water electrolysis hydrogen production system;

A hydrogen fuel cell system, wherein the hydrogen fuel cell system is connected to a hydrogen storage system, and hydrogen in the hydrogen storage system enters the hydrogen fuel cell system to generate electricity;

A carbon dioxide storage system for storing carbon dioxide gas;

A carbon dioxide hydrogenation methanol system, wherein the carbon dioxide hydrogenation methanol system is connected to a carbon dioxide storage system and a hydrogen storage system, and the carbon dioxide gas entering the hydrogen fuel cell system enters the carbon dioxide hydrogenation methanol system together with the hydrogen to produce a methanol product; and the methanol is passed into the methanol storage system;

A methanol storage system, wherein the methanol storage system is connected to the carbon dioxide hydrogenation to methanol system, and the methanol generated in the carbon dioxide hydrogenation to methanol system is stored in the methanol storage system;

An energy storage inverter cabinet is connected to the electrochemical energy storage system and the hydrogen fuel cell system respectively, and is used to control the conversion of AC and DC power.

Preferably, the distributed integrated energy system of the present invention integrating energy storage, hydrogen production and methanol production also includes an electrical cabinet, an operating cabinet and a temperature control system. The electrical cabinet controls the AC power supply required by each system, the operating cabinet controls the operating status and data monitoring of each system, and the temperature control system controls the air temperature in the container, the operating temperature of the hydrogen storage system and the operating temperature of the carbon dioxide hydrogenation to methanol system.

Preferably, in the distributed integrated energy system integrating energy storage, hydrogen production and methanol production of the present invention, the hardware of the system is built into a container, the interior of the container is divided into multiple areas in the form of isolation doors, the electrical cabinet and the operation cabinet are respectively located in separate areas at both ends of the container, and the electrochemical energy storage system is located alone in the middle area.

Preferably, in the distributed integrated energy system of the present invention integrating energy storage, hydrogen production and methanol production, the hydrogen storage system adopts a metal hydride hydrogen storage method, which releases heat when storing hydrogen and absorbs heat when releasing hydrogen.

Preferably, in the distributed integrated energy system integrating energy storage, hydrogen production and methanol production of the present invention, the operating temperature of the carbon dioxide hydrogenation to methanol system is set to 50-300°C, and heat is released during the operation of the carbon dioxide hydrogenation to methanol system.

Preferably, in the distributed integrated energy system integrating energy storage, hydrogen production and methanol production of the present invention, the temperature control system has a built-in heat exchanger, and the heat exchanger exchanges and couples heat between the hydrogen storage system and the carbon dioxide hydrogenation methanol production system to maintain the optimal temperature required for system operation.

Preferably, in the distributed comprehensive energy system of the present invention that integrates energy storage, hydrogen production and methanol production, the operation cabinet is used to monitor the operating data of each system, and analyze and control the operating status of electrochemical energy storage and hydrogen energy storage, and give priority to electrochemical energy storage and energy supply when adjusting the daytime peak-valley difference, and give priority to hydrogen energy storage and energy supply when adjusting the electricity peak-valley difference due to long-cycle conditions such as weather or climate.

Preferably, in a distributed integrated energy system integrating energy storage, hydrogen production and methanol production of the present invention, the operation cabinet is configured to complete the switching of the working states of the overall system between energy storage, standby and energy supply within 1 second of receiving the energy storage operation state change signal, and maintain stability.

Preferably, the distributed comprehensive energy system of the present invention integrating energy storage, hydrogen production and methanol production is also provided with a fire fighting system, which is used to monitor the temperature of each hardware device in the container and extinguish the fire when there is a fire.

Preferably, in the distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production of the present invention, oxygen and hydrogen produced by water electrolysis in the water electrolysis hydrogen production system are separated and collected and stored separately.

The beneficial effects of the present invention are: 1. The present invention combines the technical advantages of electrochemical energy storage, hydrogen energy storage, and methanol energy storage, and can simultaneously realize application scenarios such as daytime peak-valley differences and long-cycle electricity peak-valley adjustments for weather or climate, and methanol products have the characteristics of high energy density and easy transportation, which makes the energy storage system more flexible.

2. The present invention has the advantages of miniaturization, modularization, and portability, and has high adaptability when applied to distributed energy storage scenarios such as new energy stations.

3. When the present invention is used for new energy stations with long-term surplus electricity, it can break through the limitation of traditional electrochemical energy storage that only has a fixed capacity, and can continuously convert the surplus electricity into hydrogen and methanol products, and has a strong ability to absorb the surplus electricity of new energy.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic diagram of the connection relationship and position distribution of an embodiment of the present application.

Detailed ways

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

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

Example 1

The present embodiment provides a distributed comprehensive energy system integrating energy storage, hydrogen production and methanol production, referring to FIG1 , including a pure water preparation system, a water electrolysis hydrogen production system, a hydrogen storage system, a hydrogen fuel cell system, a carbon dioxide storage system, a carbon dioxide hydrogenation methanol production system, a methanol storage system, an electrochemical energy storage system and an energy storage inverter cabinet; the pure water produced by the pure water preparation system is introduced into the water electrolysis hydrogen production system; the water electrolysis hydrogen production system produces hydrogen and oxygen by electrolysis, oxygen and hydrogen are collected and stored separately, the oxygen product is used for other production purposes, and hydrogen is introduced into the hydrogen storage system; a portion of the hydrogen in the hydrogen storage system is introduced into the hydrogen fuel cell The system generates electricity; the other part of the hydrogen in the hydrogen storage system and the carbon dioxide gas in the carbon dioxide storage system enter the carbon dioxide hydrogenation to methanol system together, and the methanol product is made and introduced into the methanol storage system; the energy storage inverter cabinet is connected to the electrochemical energy storage system and the hydrogen fuel cell system respectively, and is used to control the conversion of AC and DC power; the system also includes an electrical cabinet, an operation cabinet and a temperature control system. The electrical cabinet controls the AC power supply required by each system, the operation cabinet controls the operating status and data monitoring of each system, and the temperature control system controls the air temperature in the container, the operating temperature of the hydrogen storage system and the operating temperature of the carbon dioxide hydrogenation to methanol system;

In this embodiment, the hardware of this system is built into a container, using a 40-foot general container. The system layout is shown in Figure 1. The container is divided into four areas, and each area is separated by an isolation door. The energy storage inverter cabinet and the electrical cabinet are located in the front-end area, the operation cabinet and the fire protection system are located in the rear-end area, the pure water preparation system, the electrolysis water hydrogen production system, the hydrogen storage system, the hydrogen fuel cell system, the carbon dioxide storage system, the carbon dioxide hydrogenation methanol system, the methanol storage system and the temperature control system are in the same area, and the electrochemical energy storage system is located in a separate area. The maximum energy storage power of the container energy storage system is set to 150kW, the maximum energy supply power is set to 200kW, the capacity of the electrochemical energy storage system is set to 500kW·h, and the corresponding time for switching the system energy storage operation state is 150ms.

The hydrogen storage system uses metal hydride to store hydrogen, and releases heat when storing hydrogen and absorbs heat when releasing hydrogen. The operating temperature of the CO2 hydrogenation to methanol system is set at 50-300°C, and heat is released during the operation of CO2 hydrogenation to methanol. The temperature control system has a built-in heat exchanger, which exchanges and couples heat between the hydrogen storage system and the CO2 hydrogenation to methanol system to maintain the temperature required during system operation and keep each system in the optimal temperature working state.

In this embodiment, the operation cabinet is used to monitor the operating data of each system, and analyze and control the operating status of electrochemical energy storage and hydrogen energy storage. When adjusting the peak-valley difference during the day, electrochemical energy storage and energy supply are given priority, and when adjusting the peak-valley difference of electricity for long periods such as weather or climate, hydrogen energy storage and energy supply are given priority. The operation cabinet is set to complete the switching of the working states between energy storage, standby, and energy supply of the overall system within 1 second of receiving the energy storage operation state change signal, and maintain the stable operation of the working state of each system.

The system is also equipped with a fire-fighting system, which is used to monitor the temperature of each hardware device in the container and extinguish the fire when there is a fire to avoid it.

Example 2

This embodiment uses a 40-inch high-box container, and the system layout is shown in Figure 1. Different from Example 1, the container of this embodiment is divided into 5 areas, and each area is separated by an isolation door. The energy storage inverter cabinet and the electrical cabinet are located in the frontmost area, the operation cabinet and the fire protection system are located in the rearmost area, the pure water preparation system, the electrolysis water hydrogen production system, the hydrogen storage system, the hydrogen fuel cell system, and the temperature control system are in the same area, the carbon dioxide storage system, the carbon dioxide hydrogenation methanol system, and the methanol storage system are in the same area, and the electrochemical energy storage system is located in a separate area. The maximum energy storage power of the container energy storage system is 200kW, the maximum energy supply power is 300kW, the capacity of the electrochemical energy storage system is 1MW·h, and the corresponding time for switching the system energy storage operation state is 150ms.

Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims (7)

1. The utility model provides a collect energy storage, hydrogen manufacturing and system methyl alcohol distributed integrated energy system as an organic whole which characterized in that includes:

A pure water preparation system for preparing pure water, separating pure water and wastewater from raw water entering the pure water preparation system, and discharging wastewater;

the system comprises a water electrolysis hydrogen production system, a pure water preparation system, a pure water supply system, a water supply system and a water supply system, wherein the water electrolysis hydrogen production system is connected with the pure water preparation system, pure water in the water electrolysis hydrogen production system is introduced, and hydrogen and oxygen are separated in an electrolysis mode;

the hydrogen storage system is connected with the water electrolysis hydrogen production system and is used for storing hydrogen generated in the water electrolysis hydrogen production system;

A hydrogen fuel cell system connected to the hydrogen storage system, wherein the hydrogen fuel cell system generates electricity from hydrogen gas entering the hydrogen fuel cell system;

a carbon dioxide storage system for storing carbon dioxide gas;

the system comprises a carbon dioxide hydrogenation methanol preparation system, a carbon dioxide storage system and a hydrogen storage system, wherein the carbon dioxide hydrogenation methanol preparation system is connected with the carbon dioxide storage system, and hydrogen in the hydrogen storage system and carbon dioxide gas in the carbon dioxide storage system enter the carbon dioxide hydrogenation methanol preparation system together to prepare a methanol product; introducing methanol into a methanol storage system;

The methanol storage system is connected with the carbon dioxide hydrogenation methanol preparation system and is used for storing methanol generated in the carbon dioxide hydrogenation methanol preparation system;

the electrochemical energy storage system is connected with the hydrogen fuel cell system, so that electricity generated by the hydrogen fuel cell system is stored;

The energy storage inversion cabinet is respectively connected with the electrochemical energy storage system and the hydrogen fuel cell system and is used for controlling the conversion of alternating current and direct current;

The system comprises a container, an electric cabinet, an operation cabinet and a temperature control system, wherein the electric cabinet is connected with each electric system and provides alternating current power supply required by each system, the operation cabinet controls the operation state and data monitoring of each system, and the temperature control system controls the air temperature in the container, the operation temperature of a hydrogen storage system and the operation temperature of a methanol preparation system by hydrogenation of carbon dioxide;

The electric cabinet, the operation cabinet and the electrochemical energy storage system are arranged in the container, the interior of the container is divided into a plurality of areas in the form of isolation doors, the electric cabinet and the operation cabinet are respectively positioned in the independent areas at the two ends of the interior of the container, and the electrochemical energy storage system is independently positioned in the middle area;

the fire-fighting system is used for monitoring the temperature of each hardware device in the container and performing fire-fighting and fire-extinguishing when a fire occurs.

2. The distributed integrated energy system integrating energy storage, hydrogen production and methanol production as set forth in claim 1, wherein: the hydrogen storage system adopts a mode of hydrogen storage by metal hydride, releases heat when hydrogen is stored, and absorbs heat when hydrogen is released.

3. The distributed integrated energy system integrating energy storage, hydrogen production and methanol production as set forth in claim 1, wherein: the working temperature of the system for preparing methanol by carbon dioxide hydrogenation is set to be 50-300 ℃, and heat is released in the operation process of preparing methanol by carbon dioxide hydrogenation.

4. The distributed integrated energy system integrating energy storage, hydrogen production and methanol production as set forth in claim 1, wherein: the temperature control system is internally provided with a heat exchanger, and the heat exchanger exchanges and couples the hydrogen storage system and the methanol preparation system by hydrogenating carbon dioxide, so as to maintain the optimal temperature required by the system in operation.

5. The distributed, integrated energy system for storing energy, producing hydrogen and producing methanol as defined in claim 4, wherein: the operation cabinet is used for monitoring operation data of each system, analyzing and controlling operation states of electrochemical energy storage and hydrogen energy storage, preferentially performing electrochemical energy storage and energy storage during daytime peak-valley difference adjustment, and preferentially performing hydrogen energy storage and energy storage during weather or climate long-period power peak-valley adjustment.

6. The distributed, integrated energy system for storing energy, producing hydrogen and producing methanol as defined in claim 5, wherein: the operation cabinet is arranged to complete the working state switching among the whole system energy storage, standby and energy supply within 1s of receiving the energy storage operation state change signal, and maintain stability.

7. The distributed integrated energy system integrating energy storage, hydrogen production and methanol production as set forth in claim 1, wherein: oxygen generated by electrolysis of water in the water electrolysis hydrogen production system is separated from hydrogen and is collected and stored independently.