Energy utilization system for coupling water electrolysis hydrogen production with solid waste incineration

Abstract

The utility model relates to an energy utilization system for hydrogen production by electrolysis of water coupled with solid waste incineration, which is divided into a system for hydrogen production by electrolysis of water and comprises an electrolytic bath, a hydrogen (oxygen) steam-water separator, a hydrogen (oxygen) purification device, a hydrogen (oxygen) storage device, an electrolyte filter, an electrolyte supplementing device, a waste heat recovery system and a circulating water system, the solid waste incineration system comprises a waste heat utilization system, airflow drying equipment, an incinerator, a waste heat boiler, a waste heat power generation system and a flue gas treatment system. According to the system, energy of the two systems is utilized mutually, waste heat generated in the water electrolysis hydrogen production process is used as a heat source for sludge drying, heat generated by sludge and garbage coupling incineration is used as a power utilization source for water electrolysis hydrogen production, and the comprehensive energy utilization efficiency of surplus heat in the system and garbage incineration power generation is improved.

Description

Technical Field

[0001] The utility model belongs to the field of water electrolysis hydrogen production, and in particular relates to an energy utilization system for water electrolysis hydrogen production coupled with solid waste incineration. Background Art

[0002] With the increasing awareness of energy conservation and emission reduction, the development and utilization of new energy has become an important direction of scientific research and industrial production. The electrolysis of water to produce hydrogen has been widely used in the fields of industry and energy storage due to its green, low-carbon and environmentally friendly characteristics. However, the existing electrolysis of water to produce hydrogen still has problems such as low energy utilization and insufficient utilization of the generated heat.

[0003] At present, solid wastes such as domestic garbage and municipal sludge are usually treated by incineration. Part of the heat generated can be used for grid-connected power generation, and the other part can be used for hydrogen production by water electrolysis. The oxygen obtained by water electrolysis can assist the incineration process of solid wastes. In addition, the waste heat generated by the hydrogen production process can be effectively recycled to the sludge drying system, and the efficient use of energy can achieve the goal of efficient and stable operation of the entire system.

[0004] For the process of combining the water electrolysis hydrogen production system with the sludge and garbage coupled incineration system, the route of converting thermal energy into electrical energy has developed maturely, but the industry has not considered the effective use of waste heat from the hydrogen production process for sludge drying, resulting in the problem of insufficient energy utilization. Utility Model Content

[0005] In order to improve the energy utilization rate of water electrolysis hydrogen production and the heat utilization efficiency of solid waste incineration, the utility model provides an energy utilization system of water electrolysis hydrogen production coupled with solid waste incineration, including a water electrolysis hydrogen production system and a solid waste incineration system:

[0006] An energy utilization system for electrolyzing water to produce hydrogen coupled with solid waste incineration, comprising an electrolyzing water to produce hydrogen system and a solid waste incineration system:

[0007] The water electrolysis hydrogen production system comprises an electrolyzer, the output end of the electrolyzer is connected to a hydrogen steam-water separator and an oxygen steam-water separator, the gas output port of the hydrogen steam-water separator is connected to an input port of a hydrogen purification device, the gas output port of the oxygen steam-water separator is connected to an input port of an oxygen purification device, the gas output port of the hydrogen purification device is connected to one end of a hydrogen storage device, the gas output port of the oxygen purification device is connected to one end of an oxygen storage device, and the gas output port of the oxygen storage device is connected to one end of an incinerator;

[0008] The solid waste incineration system includes an incinerator, the flue gas outlet of the incinerator is connected to one end of a waste heat boiler, the flue gas outlet of the waste heat boiler is connected to a flue gas treatment system, the waste heat boiler is also connected in series with a waste heat power generation system, and the power output port of the waste heat power generation system is connected to an electrolytic cell; the inlet of the incinerator is connected to low-moisture sludge and a garbage pit, and the low-moisture sludge is dehydrated by an airflow drying device; the airflow drying device is connected to a waste heat utilization system, and the waste heat utilization system is connected to a waste heat recovery system.

[0009] Preferably, the electrolyte output port of the hydrogen steam-water separator and the oxygen steam-water separator is connected to one end of the waste heat recovery system, the other end of the waste heat recovery system is connected to the electrolyte filter, and the electrolyte output port of the electrolyte filter is connected to the electrolytic cell through an electrolyte circulation pump.

[0010] Preferably, the circulating water inlet of the waste heat recovery system is connected to the circulating water outlet of the oxygen purification device, the other end of the circulating water of the oxygen purification device is connected to the hydrogen purification device, the circulating water inlet of the hydrogen purification device is connected to the circulating water system, the circulating water of the circulating water system is connected to the waste heat utilization system, and the circulating water of the waste heat utilization system is connected to the waste heat recovery system.

[0011] Preferably, another output port of the waste heat power generation system is connected to the power grid.

[0012] Preferably, an electrolyte replenishing device is connected to the electrolyte output pipeline of the electrolyte filter.

[0013] Beneficial effects: The utility model is an energy utilization system for electrolytic water hydrogen production coupled with solid waste incineration. By coupling the incineration of solid wastes such as domestic garbage and municipal sludge, the heat generated is converted into electricity, part of which is provided for grid-connected power generation, and the other part is provided for electrolytic water hydrogen production. The oxygen obtained by electrolytic water hydrogen production can improve the incineration effect of solid waste, and the waste heat generated in the hydrogen production process can be effectively recovered and used for drying high-water content sludge. The entire system not only reduces the cost of hydrogen production through the effective utilization and conversion of energy, but also improves the waste incineration effect, achieving the purpose of energy saving and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the system disclosed in the embodiment.

[0015] Numbers in the figure: 1. electrolytic cell; 2. hydrogen gas-water separator; 3. oxygen gas-water separator; 4. hydrogen purification device; 5. oxygen purification device; 6. hydrogen storage device; 7. oxygen storage device; 8. waste heat recovery system; 9. electrolyte filter; 10. electrolyte replenishing device; 11. circulating water system; 12. waste heat utilization system; 13. high-moisture sludge; 14. airflow drying equipment; 15. low-moisture sludge; 16. garbage pit; 17. incinerator; 18. waste heat boiler; 19. flue gas treatment system; 20. waste heat power generation system; 21. power grid. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] The overall process diagram of an energy utilization system for electrolysis of water to produce hydrogen coupled with solid waste incineration is as follows Figure 1 As shown, it includes a water electrolysis hydrogen production system and a solid waste incineration system:

[0018] The water electrolysis hydrogen production system comprises an electrolyzer 1, a hydrogen gas-water separator 2, an oxygen gas-water separator 3, a hydrogen purification device 4, an oxygen purification device 5, a hydrogen storage device 6, an oxygen storage device 7, a waste heat recovery system 8, an electrolyte filter 9, and an electrolyte replenishing device 10;

[0019] The solid waste incineration system includes a waste heat utilization system 12 , an airflow drying device 14 , an incinerator 17 , a waste heat boiler 18 , a flue gas treatment system 19 , and a waste heat power generation system 20 .

[0020] The electrolytic cell 1 generates hydrogen and oxygen through the electrolysis of water. Hydrogen is separated from most of the electrolyte by the hydrogen gas-water separator 2, and then further removed from the gas by the hydrogen purification device 4. The obtained pure hydrogen is output to the hydrogen storage device 6 for standby. Similarly, oxygen is separated from most of the electrolyte by the oxygen gas-water separator 3, and then further removed from the gas by the oxygen purification device 5. The obtained pure oxygen is output to the oxygen storage device 7 for standby, providing sufficient and stable oxygen for the incinerator 17 to ensure the stability and completeness of the solid waste combustion process.

[0021] The process of producing hydrogen by electrolysis of water is an exothermic process, and the temperature of the electrolyte at the outlet of the electrolyzer 1 can reach up to 95°C. In order to ensure that the temperature of the alkali solution in the electrolyzer 1 is stable within the 85°C-90°C required by the equipment, the electrolyte outlets of the hydrogen gas-water separator 2 and the oxygen gas-water separator 3 are connected to the waste heat recovery system 8, and the heat is recovered through the circulating water system 11 and then connected to the electrolyte filter 9. Temperature sensors are provided on both sides of the electrolyte inlet and outlet of the waste heat recovery system 8 to control the stability of the alkali solution temperature. The electrolyte filter 9 can remove impurities and unstable components in the alkali solution and improve the purity and stability of the electrolyte. The filtered electrolyte is sent to the electrolyzer 1 for reuse by the circulating pump.

[0022] Since the concentration of electrolyte is continuously reduced during the process of producing hydrogen by electrolysis of water, an electrolyte replenishing device 10 is provided on the electrolyte output pipeline of the electrolyte filter 9 to ensure the concentration of electrolyte and the electrolysis efficiency.

[0023] The circulating water input port of the waste heat recovery system 8 is connected to the circulating water output port of the oxygen purification device 5, and the other end of the circulating water of the oxygen purification device 5 is connected to the hydrogen purification device 4, and the circulating water input port of the hydrogen purification device 4 is connected to the output port of the circulating water system 11. The hydrogen (oxygen) purification device includes gas washing, cooling and drying. The circulating water system 11 achieves primary heat exchange by cooling the two gases, and then the waste heat recovery system 8 cools the electrolyte to achieve secondary heat exchange. The heated circulating water is transported to the waste heat utilization system 12, and the heat utilization of the water electrolysis hydrogen production system is completed through water vapor heat exchange. Finally, the circulating water after heat exchange is transported to the circulating water system 11 to achieve circulation.

[0024] The circulating air required by the airflow drying equipment 14 is heated by the circulating water in the waste heat utilization system 12, and the water in the high-water content sludge 13 is removed by hot air. The dehydrated low-water content sludge 15 and the garbage pit 16 enter the incinerator 17 through the feeding device for coupled incineration. The large amount of flue gas generated is heat-exchanged with saturated water in the waste heat boiler 18 to produce superheated steam. The flue gas after heat exchange is finally disposed of by the subsequent flue gas treatment system 19. The superheated steam generated is used to generate electricity for the waste heat power generation system 20, and the power output port is connected to the electrolyzer 1 to provide electricity for the water hydrogen production in the electrolyzer. Another power output port is connected to the power grid 21 for online sales.

Claims

1. An energy utilization system for hydrogen production by water electrolysis coupled with solid waste incineration, characterized in that: Including water electrolysis hydrogen production system and solid waste incineration system: The water electrolysis hydrogen production system comprises an electrolyzer (1), the output end of the electrolyzer (1) is connected to a hydrogen steam-water separator (2) and an oxygen steam-water separator (3), the gas output port of the hydrogen steam-water separator (2) is connected to an input port of a hydrogen purification device (4), the gas output port of the oxygen steam-water separator (3) is connected to an input port of an oxygen purification device (5), the gas output port of the hydrogen purification device (4) is connected to one end of a hydrogen storage device (6), the gas output port of the oxygen purification device (5) is connected to one end of an oxygen storage device (7), and the gas output port of the oxygen storage device (7) is connected to one end of an incinerator (17); The solid waste incineration system comprises an incinerator (17), the flue gas outlet of the incinerator (17) is connected to one end of a waste heat boiler (18), the flue gas outlet of the waste heat boiler (18) is connected to a flue gas treatment system (19), the waste heat boiler (18) is also connected in series with a waste heat power generation system (20), the power output port of the waste heat power generation system (20) is connected to an electrolytic cell (1); the inlet of the incinerator (17) is connected to low-moisture sludge (15) and a garbage pit (16), the low-moisture sludge (15) is dehydrated by an airflow drying device (14); the airflow drying device (14) is connected to a waste heat utilization system (12), and the waste heat utilization system (12) is connected to a waste heat recovery system (8).

2. According to claim 1, an energy utilization system for electrolyzing water to produce hydrogen coupled with solid waste incineration is characterized in that: The electrolyte outlets of the hydrogen steam-water separator (2) and the oxygen steam-water separator (3) are connected to one end of a waste heat recovery system (8), the other end of the waste heat recovery system (8) is connected to an electrolyte filter (9), and the electrolyte outlet of the electrolyte filter (9) is connected to the electrolytic cell (1) via an electrolyte circulation pump.

3. According to claim 1, an energy utilization system for electrolyzing water to produce hydrogen coupled with solid waste incineration is characterized in that: The circulating water input port of the waste heat recovery system (8) is connected to the circulating water output port of the oxygen purification device (5), the other end of the circulating water of the oxygen purification device (5) is connected to the hydrogen purification device (4), the circulating water input port of the hydrogen purification device (4) is connected to the circulating water system (11), the circulating water of the circulating water system (11) is connected to the waste heat utilization system (12), and the circulating water of the waste heat utilization system (12) is connected to the waste heat recovery system (8).

4. According to claim 1, an energy utilization system for electrolyzing water to produce hydrogen coupled with solid waste incineration is characterized in that: Another output port of the waste heat power generation system (20) is connected to the power grid (21).

5. According to claim 2, an energy utilization system for hydrogen production by water electrolysis coupled with solid waste incineration is characterized in that: The electrolyte output pipeline of the electrolyte filter (9) is connected to an electrolyte replenishing device (10).

Images