阅读说明：本技术 一种基于镁还原二氧化碳的双级储能发电系统和方法 (Two-stage energy storage power generation system and method based on magnesium reduction of carbon dioxide ) 是由 王晓冰 罗志 董陈 张波 鲁晓宇 李明皓 白永岗 向小凤 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种基于镁还原二氧化碳的双级储能发电系统和方法,镁碳分离子系统的出口及空分装置的O-(2)出口与碳/O-(2)燃烧器的入口相连通,碳/O-(2)燃烧器的出口与双燃烧锅炉透平发电机组中的第一锅炉相连通,第一锅炉的CO-(2)出口与CO-(2)压缩储存装置相连通；CO-(2)压缩储存装置的出口及镁还原子系统的出口与镁/CO-(2)燃烧器相连接；镁/CO-(2)燃烧器与双燃烧锅炉透平发电机组中的第二锅炉相连通,第二锅炉的MgO、C排出口与镁碳分离子系统相连通；双燃烧锅炉透平发电机组的发电输出端与外界的电网相连接,盐酸制备子系统与镁碳分离子系统及镁还原子系统相连接,该系统和方法能够在无煤可用时满足极端气候时的电网需求。(The invention discloses a two-stage energy storage power generation system and method based on magnesium reduction of carbon dioxide, an outlet of a magnesium-carbon separation subsystem and an O of an air separation device 2 Outlet and carbon/O 2 Inlet of the burner is communicated with carbon/O 2 The outlet of the combustor is communicated with a first boiler in a turbine generator set of a double-combustion boiler, and CO of the first boiler 2 Outlet and CO 2 The compression storage devices are communicated; CO 2 2 Outlet of compression storage device and outlet of magnesium reduction subsystem and magnesium/CO 2 The combustor is connected; magnesium/CO 2 The combustor is communicated with a second boiler in the double-combustion boiler turbine generator set, and MgO and C discharge ports of the second boiler are communicated with the magnesium-carbon separation subsystem; the power generation output end of the double-combustion boiler turbine generator set is connected with an external power grid, the hydrochloric acid preparation subsystem is connected with the magnesium-carbon separation subsystem and the magnesium reduction subsystem, and the system and the method can be used for realizing the purposes of improving the yield of the hydrochloric acid and reducing the yield of the hydrochloric acidCan meet the power grid requirement in extreme climates when no coal is available.)

1. A two-stage energy storage power generation system based on magnesium reduction of carbon dioxide is characterized by comprising a power generation subsystem, a magnesium-carbon separation subsystem, a magnesium reduction subsystem and a hydrochloric acid preparation subsystem;

the power generation subsystem comprises a turbine generator set (1) of a double-combustion boiler and carbon/O (carbon/oxygen)₂Burner (3), magnesium/CO₂Combustor (4), air separation plant (7) and CO₂A compressed storage device (8);

an outlet of the magnesium-carbon separation subsystem and O of an air separation device (7)₂Outlet and carbon/O₂The inlet of the burner (3) is communicated with carbon/O₂The outlet of the combustor (3) is communicated with a first boiler in the double-combustion boiler turbine generator set (1), and CO of the first boiler₂Outlet (6) with CO₂The compression storage devices (8) are communicated;

CO₂the outlet of the compression storage device (8) and the outlet of the magnesium reduction subsystem and the magnesium/CO₂The burner (4) is connected; magnesium/CO₂The combustor (4) is communicated with a second boiler in the double-combustion boiler turbine generator set (1), and MgO and C discharge ports (5) of the second boiler are communicated with the magnesium-carbon separation subsystem;

the power generation output end (2) of the double-combustion boiler turbine generator set (1) is connected with an external power grid, and the hydrochloric acid preparation subsystem is connected with the magnesium-carbon separation subsystem and the magnesium reduction subsystem.

2. The two-stage energy storage and power generation system based on magnesium-reduced carbon dioxide of claim 1, wherein the magnesium-carbon separation subsystem comprises MgCl₂Generating and separating device (9, carbon storage (13) and MgCl₂A tank (10);

MgCl₂the input end of the generating and separating device (9) is communicated with the MgO and C discharge port (5) of the second boiler and the hydrochloric acid preparation subsystem, and MgCl is adopted₂MgCl for the generating and separating device (9)₂Export with MgCl₂The inlet of the storage tank (10) is communicated with MgCl₂The outlet of the storage tank (10) is communicated with a magnesium reduction subsystem, MgCl₂The C outlet of the generating and separating device (9) is communicated with the inlet of the carbon storage field (13), MgCl₂H of the generating and separating device (9)₂The outlet of the O is communicated with the hydrochloric acid preparation subsystem, and the outlet of the carbon storage yard (13) is communicated with carbon/O₂The inlets of the burners (3) are communicated.

3. The two-stage energy storage and power generation system based on magnesium-reduced carbon dioxide as claimed in claim 2, wherein the magnesium reduction subsystem comprises an electrolytic magnesium device (11) and a Mg storage tank (12);

inlet of magnesium electrolysis device (11) and MgCl₂The outlet of the storage tank (10) is communicated with Cl of the magnesium electrolysis device (11)₂The outlet is communicated with the hydrochloric acid preparation subsystem, the Mg outlet of the magnesium electrolysis device (11) is communicated with the inlet of the Mg storage tank (12), and the outlet of the Mg storage tank (12) is communicated with magnesium/CO₂The inlets of the burners (4) are communicated.

4. The dual-stage energy storage and power generation system based on magnesium-reduced carbon dioxide as claimed in claim 3, wherein the salt preparation subsystem comprises a hydrochloric acid generation device (14) and a hydrochloric acid storage tank (15);

cl of electrolytic magnesium device (11)₂Export and MgCl₂H of the generating and separating device (9)₂The outlet of the O is communicated with the inlet of a hydrochloric acid generating device (14), and the outlet of the hydrochloric acid generating device (14) is communicated with the inlet of a hydrochloric acid storage tank (15); an outlet of the hydrochloric acid storage tank (15) and MgCl₂The inlets of the generating and separating device (9) are communicated.

5. The two-stage energy storage and power generation system based on magnesium-reduced carbon dioxide of claim 1, wherein carbon/O₂Burner (3) with magnesium/CO₂The burners (4) are put into operation in a time-sharing manner or simultaneously.

6. The two-stage energy storage and power generation system based on magnesium-reduced carbon dioxide of claim 1, wherein the CO is CO₂The compression storage device (8) is provided with a device for receiving external CO₂The interface of (2).

7. The two-stage energy storage and power generation method based on magnesium-reduced carbon dioxide is characterized in that the two-stage energy storage and power generation system based on magnesium-reduced carbon dioxide as claimed in claim 4 comprises:

when there is surplus renewable energy to supply power, MgCl will be used₂MgCl in the tank (10)₂Feeding into a magnesium electrolysis device (11), and utilizing surplus renewable energy to supply power and electrolyze to generate Mg and Cl₂Transferring electric energy to Mg in the reaction process to form primary energy storage, sending the generated Mg into a Mg storage tank (12) for storage to form primary energy storage, and generating Cl₂Sending the hydrochloric acid into a hydrochloric acid generating device (14), and sending the dilute hydrochloric acid generated by the hydrochloric acid generating device (14) into a hydrochloric acid storage tank (15) for storage; when the Mg storage reaches the preset storage, the magnesium/CO₂The combustor (4) is put into operation to carry out exothermic reaction, one part of the energy stored by the Mg is output to a second boiler, and the other part of the energy is transferred to the C to form secondary energy storage;

in non-extreme climatic conditions, only Mg/CO is put into operation₂The combustor, the double combustion boiler turbine generator set (1) operates at a lower load, and the power generation subsystem operates to output electric energy to an external power grid to consume CO₂Compressing CO stored in a storage device (8)₂MgO and C generated in the process and hydrochloric acid output by a hydrochloric acid storage tank (15) are proportionally sent into MgCl₂Separating with water in a generating and separating device (9), wherein the separated C is sent to a carbon storage yard (13) for storage, and the separated MgCl is₂Feeding into MgCl₂H generated by buffering in a storage tank (10)₂Feeding the O into a hydrochloric acid generation device (14);

when the whole network range is short of wind for a long time and the power supply of the power grid cannot be stably supplied, O output by the air separation device (7)₂Is sent into carbon/O with C output from a carbon storage yard (13)₂The combustor (3) is used for carrying out exothermic reaction, the double-combustion boiler turbine generator set (1) operates under the high-load working condition, and carbon/O (oxygen/oxygen)₂CO produced by the commissioning of the burner (3)₂Feeding back CO₂Compressing the storage device (8) for recycling.

Technical Field

The invention belongs to the technical field of safe and zero-emission power generation, and relates to a two-stage energy storage power generation system and method based on magnesium reduction of carbon dioxide.

Background

Wind power and photovoltaic power generation have intermittence, randomness and fluctuation, so that great challenges are formed on the safety and reliability of a power system, especially under extreme meteorological conditions, the wind power and photovoltaic power generation are blocked, an energy storage power station cannot be used, and the power supply faces a huge crisis.

In terms of the prior art, the cost is limited, the energy storage technology is limited to eliminate small-amplitude and short-time power fluctuation at the power supply side in the wind-solar power generation at present, the power supply cannot be adjusted according to the power grid requirement in a short period, and the power crisis in extreme climate cannot be dealt with even when no coal is available.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a double-stage energy storage power generation system and method based on magnesium reduction of carbon dioxide, which can meet the power grid requirements in extreme climates when no coal is available.

In order to achieve the aim, the two-stage energy storage power generation system based on magnesium reduction carbon dioxide comprises a power generation subsystem, a magnesium-carbon separation subsystem, a magnesium reduction subsystem and a hydrochloric acid preparation subsystem;

the power generation subsystem comprises a turbine generator set of a double-combustion boiler and carbon/O (carbon/oxygen)₂Burner, magnesium/CO₂Combustor, air separation plant and CO₂Compressing the storage device;

outlet of magnesium-carbon separation subsystem and O of air separation plant₂Outlet and carbon/O₂Inlet of burnerAre connected to carbon/O₂The outlet of the combustor is communicated with a first boiler in a turbine generator set of a double-combustion boiler, and CO of the first boiler₂Outlet and CO₂The compression storage devices are communicated;

CO₂outlet of compression storage device and outlet of magnesium reduction subsystem and magnesium/CO₂The combustor is connected; magnesium/CO₂The combustor is communicated with a second boiler in the double-combustion boiler turbine generator set, and MgO and C discharge ports of the second boiler are communicated with the magnesium-carbon separation subsystem;

the power generation output end of the double-combustion boiler turbine generator set is connected with an external power grid, and the hydrochloric acid preparation subsystem is connected with the magnesium-carbon separation subsystem and the magnesium reduction subsystem.

The magnesium carbon separator system comprises MgCl₂Generating and separating device, carbon storage yard and MgCl₂A storage tank;

MgCl₂the input end of the generating and separating device is communicated with the MgO and C discharge ports of the second boiler and the hydrochloric acid preparation subsystem, and MgCl is adopted₂MgCl for generating and separating device₂Export with MgCl₂The inlet of the storage tank is communicated with MgCl₂The outlet of the storage tank is communicated with a magnesium reduction subsystem, MgCl₂The C outlet of the generating and separating device is communicated with the inlet of the carbon storage field, and MgCl is added₂H of generating and separating device₂The outlet of the O is communicated with the hydrochloric acid preparation subsystem, and the outlet of the carbon storage yard is communicated with carbon/O₂The inlets of the burners are communicated.

The magnesium reduction subsystem comprises a magnesium electrolysis device and a Mg storage tank;

inlet of magnesium electrolysis apparatus and MgCl₂The outlet of the storage tank is communicated with Cl of the magnesium electrolysis device₂The outlet is communicated with the hydrochloric acid preparation subsystem, the Mg outlet of the magnesium electrolysis device is communicated with the inlet of the Mg storage tank, and the outlet of the Mg storage tank is communicated with the magnesium/CO₂The inlets of the burners are communicated.

The salt preparation subsystem comprises a hydrochloric acid generation device and a hydrochloric acid storage tank;

cl of electrolytic magnesium device₂Export and MgCl₂H of generating and separating device₂The outlet of the O is communicated with the inlet of the hydrochloric acid generating device, and the outlet of the hydrochloric acid generating device is communicated with the inlet of the hydrochloric acid storage tank; outlet of hydrochloric acid storage tank and MgCl₂The inlets of the generating and separating device are communicated.

carbon/O₂Burner and magnesium/CO₂The burners are put into operation time-divisionally or simultaneously.

CO₂The compression storage device is provided with a device for receiving external CO₂The interface of (2).

The invention discloses a two-stage energy storage power generation method based on magnesium reduction of carbon dioxide, which comprises the following steps:

when there is surplus renewable energy to supply power, MgCl will be used₂MgCl in storage tank₂Feeding into a magnesium electrolysis device, and utilizing surplus renewable energy sources to supply power and electrolyze to generate Mg and Cl₂Transferring electric energy to Mg in the reaction process to form primary energy storage, sending the generated Mg into a Mg storage tank for storage to form primary energy storage, and generating Cl₂Sending the diluted hydrochloric acid into a hydrochloric acid generating device, and sending the diluted hydrochloric acid generated by the hydrochloric acid generating device into a hydrochloric acid storage tank for storage; when the Mg storage reaches the preset storage, the magnesium/CO₂The combustor is put into operation to carry out exothermic reaction, one part of the energy stored by the Mg is output to a second boiler, and the other part of the energy is transferred to the C to form secondary energy storage;

in non-extreme climatic conditions, only Mg/CO is put into operation₂The combustor, the double-combustion boiler turbine generator set operate under lower load, and the power generation subsystem operates to output electric energy to an external power grid to consume CO₂Compressing CO stored in a storage device₂The MgO and C produced in the process and the hydrochloric acid output by the hydrochloric acid storage tank are proportionally sent into MgCl₂Separating with water in the generating and separating device, wherein the separated C is sent to a carbon storage yard for storage, and the separated MgCl₂Feeding into MgCl₂Caching in a storage tank, generated H₂Feeding the O into a hydrochloric acid generation device;

when the whole network range is short of wind for a long time and the power grid cannot stably supply power, the O output by the air separation device₂Feeding C from carbon storage site to carbon/O₂An exothermic reaction in the burner, twocarbon/O operation of combustion boiler turbine generator set under high load condition₂CO produced by burner commissioning₂Feeding back CO₂Compressing the storage device for recycling.

The invention has the following beneficial effects:

in the specific operation of the two-stage energy storage power generation system and the method based on magnesium reduction of carbon dioxide, the fixed sequence (Mg → MgO → MgCl) is formed in the form of simple substance or compound₂Closed circulation of → Mg), no consumption of magnesium in the production process; in addition, the first-stage Mg energy storage in the two-stage energy storage meets the requirement of a power grid for short-term stable power supply, the second-stage C energy storage can be stored indefinitely and infinitely, the power supply safety under the extreme climate condition is ensured, and then the power grid requirement under the extreme climate is met when no coal is available; in addition, CO is consumed during system operation₂Can resolve a large amount of CO sealed in a double-carbon target implementation process₂The risk of leakage to the environment is mitigated or eliminated.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is a turbine generator set of a double-combustion boiler, 2 is a power generation output end, and 3 is carbon/O₂Burner, 4 is magnesium/CO₂Burner, 5 as MgO, C outlet, 6 as CO₂An outlet, 7 is an air separation device, 8 is CO₂Compressed storage device, 9 is MgCl₂Generating and separating device, 10 is MgCl₂A storage tank, 11 an electrolytic magnesium device, 12 an Mg storage tank, 13 a carbon storage site, 14 a hydrochloric acid generation device, and 15 a hydrochloric acid storage tank.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, the two-stage energy storage power generation system based on magnesium reduction carbon dioxide of the present invention includes a power generation subsystem, a magnesium-carbon separation subsystem, a magnesium reduction subsystem, and a hydrochloric acid preparation subsystem;

the power generation subsystem comprises a turbine generator set 1 of a double-combustion boiler and carbon/O (carbon/oxygen)₂Burner 3, magnesium/CO₂Combustor 4, air separation plant 7 and CO₂A compression storage device 8; outlet of magnesium-carbon separation subsystem and O of air separation plant 7₂Outlet and carbon/O₂Inlet of the burner 3 is connected to carbon/O₂The outlet of the burner 3 is connected to the first boiler of the turbine generator set 1 of the double-combustion boiler, the CO of the first boiler₂Outlet 6 and CO₂The compression storage device 8 is communicated; CO 2₂The compression storage device 8 is provided with a device for receiving external CO₂Interface of, CO₂Export of the compression storage device 8 and magnesium reduction subsystem and magnesium/CO₂The combustor 4 is connected; magnesium/CO₂The combustor 4 is communicated with a second boiler in the double-combustion boiler turbine generator set 1, and MgO and C discharge ports 5 of the second boiler are communicated with the magnesium-carbon separation subsystem; carbon/O₂Burner 3 and magnesium/CO₂The burners 4 can be put into operation at different time or simultaneously, and the power generation output end 2 of the double-combustion boiler turbine generator set 1 is connected with an external power grid;

the magnesium carbon separator system comprises MgCl₂Generating and separating device 9, carbon storage 13 and MgCl₂A storage tank 10; MgCl₂The input end of the generating and separating device 9 is communicated with the MgO and C discharge port 5 of the second boiler and the hydrochloric acid preparation subsystem, MgCl₂MgCl for the generating and separating device 9₂Export with MgCl₂The inlet of the storage tank 10 is communicated with MgCl₂The outlet of the storage tank 10 is communicated with a magnesium reduction subsystem, MgCl₂The C outlet of the generating and separating device 9 is connected to the inlet of a carbon storage 13, MgCl₂H of generating and separating device 9₂The outlet of the O is communicated with the hydrochloric acid preparation subsystem, and the outlet of the carbon storage 13 is communicated with carbon/O₂The inlets of the burners 3 are in communication.

The magnesium reduction subsystem comprises a magnesium electrolysis device 11 and a Mg storage tank 12; inlet of the magnesium electrolysis apparatus 11 and MgCl₂The outlet of the storage tank 10 is communicated with Cl of the magnesium electrolysis device 11₂The outlet is communicated with the hydrochloric acid preparation subsystem, the Mg outlet of the magnesium electrolysis device 11 is communicated with the inlet of the Mg storage tank 12, and the outlet of the Mg storage tank 12 is communicated with magnesium/CO₂The inlets of the burners 4 are in communication.

The salt preparation subsystem comprises a hydrochloric acid generation device 14 and a hydrochloric acid storage tank 15; cl of the electrolytic magnesium device 11₂Export and MgCl₂H of generating and separating device 9₂The outlet of the O is communicated with the inlet of the hydrochloric acid generating device 14, and the outlet of the hydrochloric acid generating device 14 is communicated with the inlet of the hydrochloric acid storage tank 15; outlet of hydrochloric acid storage tank 15 and MgCl₂The inlets of the generating and separating device 9 are communicated; cl₂And H₂The O reacts in a hydrochloric acid generator 14 to generate hydrochloric acid, which is sent to a hydrochloric acid storage tank 15.

The invention discloses a two-stage energy storage power generation method based on magnesium reduction of carbon dioxide, which comprises the following steps:

when there is surplus renewable energy to supply power, MgCl will be used₂MgCl in tank 10₂Feeding into a magnesium electrolysis device 11, and utilizing surplus renewable energy to supply power and electrolyze to generate Mg and Cl₂Transferring electric energy to Mg in the reaction process to form primary energy storage, sending the generated Mg into the Mg storage tank 12 for storage to form primary energy storage, and generating Cl₂Sending to a hydrochloric acid generator 14 to generate hydrochloric acidThe dilute hydrochloric acid generated by the device 14 is sent to a hydrochloric acid storage tank 15 for storage, wherein the Mg storage tank 12 and MgCl₂The design reserve of the storage tank 10 is calculated and determined according to the total electric energy to be consumed in the first-stage energy storage design days; when the Mg storage reaches the preset storage, the magnesium/CO₂The burner 4 is put into operation, the reaction of which is an exothermic reaction: 2Mg + CO₂2MgO + C, outputting one part of the energy stored in the Mg to a second boiler in the form of reaction heat in the reaction process, and transferring the other part of the energy to the C to form secondary energy storage;

in non-extreme climatic conditions, the double-combustion boiler turbo-generator set 1 is only put into operation with Mg/CO₂The combustor and the unit operate under lower load, and the power generation subsystem flexibly outputs electric energy to the power grid and consumes CO₂Compressing CO stored in storage means 8₂When CO is present₂Compressing CO in storage 8₂When the reserves are less, the supply is from the outside, the MgO and C generated in the process and the hydrochloric acid output by the hydrochloric acid storage tank 15 are proportionally sent into MgCl₂In the generating and separating device 9, MgCl is used₂Dissolve in water, while C does not dissolve in water, to achieve MgCl₂And C separation, wherein the separated C is sent to a carbon storage site 13 for storage, and the separated MgCl is₂Feeding into MgCl₂Short term buffering of generated H in tank 10₂Feeding the O into a hydrochloric acid generation device 14 for preparing hydrochloric acid;

when the whole network range is short of wind for a long time and the power grid cannot stably supply power, the O output by the air separation device 7₂Is fed into carbon/O with C output from carbon storage 13₂An exothermic reaction is carried out in the burner 3, the reaction formula being: c + O₂＝CO₂The double-combustion boiler turbine generator set 1 operates under a high-load working condition; carbon/O₂CO produced by putting the burner 3 into operation₂Feeding back CO₂The compressed storage device 8 is used for recycling.