A solar-driven integrated system for onboard ammonia decomposition hydrogen production and BOG recovery

Abstract

The application provides a solar energy driven integrated system for onboard ammonia decomposition hydrogen production and BOG recovery, which comprises a power supply device, an ammonia fuel storage unit, a BOG recovery unit, an ammonia decomposition unit and a fuel cell unit; the power supply device comprises a dish type concentrating system (1); the dish type concentrating system distributes its concentrated light energy to a first light output end communicated with a Stirling generator (3) and a second light output end communicated with a trough type solar energy collector (2); when the integrated system works, the Stirling generator is driven by input light energy to supply power to the ammonia fuel storage unit, the BOG recovery unit, the ammonia decomposition unit or the fuel cell unit, and the trough type solar energy collector supplies heat to an ammonia decomposition reactor (17) of the ammonia decomposition unit; the application produces clean hydrogen by recovering BOG (boil-off gas) in the ammonia transportation process, and can also meet the power and heat demand by integrating the solar energy infrastructure on the energy transportation ship and the fuel cell cooperation.

Description

Technical Field

[0001] This invention relates to the field of liquid ammonia transport ship technology, and in particular to a solar-driven integrated system for shipborne ammonia decomposition to produce hydrogen and BOG recovery. Background Technology

[0002] Hydrogen energy is one of the most promising clean energy sources in the 21st century, and it is projected to account for 20% of global energy consumption by 2050. However, due to the low volumetric energy density of hydrogen, storage and transportation are key factors restricting the development of hydrogen energy.

[0003] Ammonia, with its advantages of high energy density, no pollution, safety, economy, and ease of storage and transportation, is becoming a promising hydrogen carrier. Therefore, transporting ammonia is a practical alternative, and ammonia distribution and transportation systems have been widely developed. Ammonia as a hydrogen carrier means the final product is likely to be hydrogen. Therefore, it is necessary to convert ammonia into hydrogen at the port of destination or on board the ship.

[0004] Existing technologies mostly focus on hydrogen production from ammonia decomposition on land, rather than hydrogen production from ammonia decomposition during ship transport, especially considering the recovery of vapors on board. Furthermore, research on integrated solar infrastructure for energy transport ships is limited due to traditional land-based and industrial applications. Summary of the Invention

[0005] This invention proposes a solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system, which is an integrated system that couples solar energy, ammonia decomposition hydrogen production, fuel cells, and BOG recovery. It produces clean hydrogen by recovering BOG (evaporated gas) during ammonia transportation, and can meet the electricity and heat requirements by integrating the solar infrastructure and fuel cells on the energy transport ship.

[0006] The present invention adopts the following technical solution.

[0007] A solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system includes an energy supply device, an ammonia fuel storage unit, a BOG recovery unit, an ammonia decomposition unit, and a fuel cell unit. The energy supply device includes a dish concentrator (1). The dish concentrator distributes its concentrated light energy to a first light output end connected to a Stirling generator (3) and a second light output end connected to a trough solar collector (2). When the integrated system is working, the Stirling generator supplies power to the ammonia fuel storage unit, the BOG recovery unit, the ammonia decomposition unit, or the fuel cell unit under the drive of the input light energy, and the trough solar collector heats the ammonia decomposition reactor (17) of the ammonia decomposition unit.

[0008] The ammonia fuel storage unit includes a liquid ammonia auxiliary tank (4) and a liquid ammonia storage tank (5), and the liquid ammonia auxiliary tank (4) is equipped with an in-tank pump (10); the BOG recovery unit includes a BOG buffer tank (6), a first compressor (7), a BOG condenser (8), a gas-liquid separator (9), a distributor (11), a shut-off valve (12), a stabilizing tank (13), and a booster pump (14); the ammonia decomposition unit includes a first preheater (15), a second preheater (16), an ammonia decomposition reactor (17), a gas purification module (18), a second compressor (19), a hydrogen storage tank (20), a pressure reducing valve (21), and a combustion furnace (22); the fuel cell unit includes a proton exchange membrane fuel cell (23), a blower (24), and an inverter (25);

[0009] The liquid ammonia auxiliary tank (4) of the ammonia fuel storage unit is connected to the distributor (11) of the BOG recovery unit via its in-tank pump (10);

[0010] The inlet of the BOG buffer tank (6) of the BOG recovery unit is connected to the liquid ammonia auxiliary tank (4) and the liquid ammonia storage tank (5) through the same pipeline; the outlet of the BOG buffer tank (6) is connected to the first compressor (7) and the gas-liquid separator (9) in sequence, and the pipeline between the compressor (7) and the gas-liquid separator (9) passes through the BOG condenser (8); the liquid output end of the gas-liquid separator (9) is connected to the liquid ammonia auxiliary tank (4); the gas-liquid separator... (9)’s gas output end is connected to the inlet of the stabilizer (13); the distributor (11) is connected to the pump (10) inside the tank, and the distributor (11) is provided with outlet one and outlet two. The outlet one of the distributor is connected to the inlet one of the BOG condenser (8) and the stabilizer (13) in sequence, and the outlet two of the distributor is connected to the inlet two of the stabilizer (13). A shut-off valve (12) is provided between the outlet two of the distributor (11) and the inlet two of the stabilizer (13).

[0011] The stabilizing tank (13) of the BOG recovery unit is connected to the ammonia decomposition unit via a booster pump (14), and then connected to the ammonia decomposition reactor (17) via the first preheater (15) and the second preheater (16) of the ammonia decomposition unit.

[0012] The decomposition products output from the ammonia decomposition reactor (17) are fed into the gas purification module (18) via the first preheater (15); the gas purification module (18) is provided with outlet one and outlet two. The outlet one of the gas purification module is connected to the second compressor (19) and the hydrogen storage tank (20), and the outlet two of the gas purification module is connected to the inlet one of the combustion furnace (22); the outlet of the combustion furnace (22) is connected in sequence to the ammonia decomposition reactor (17) and the second preheater (16);

[0013] The fuel cell unit includes a proton exchange membrane fuel cell (23), a blower (24), and an inverter (25). The hydrogen storage tank (20) is connected to the anode inlet of the proton exchange membrane fuel cell (23), and a pressure reducing valve (21) is provided on the pipeline between the anode inlet of the proton exchange membrane fuel cell (23) and the hydrogen storage tank (20). The anode outlet of the proton exchange membrane fuel cell (23) is connected to the inlet of the combustion furnace (22). The cathode inlet of the proton exchange membrane fuel cell (23) is connected to the blower (24).

[0014] The bottom of the liquid ammonia auxiliary tank (4) is equipped with an in-tank pump (10) for pumping the liquid ammonia in the tank to the distributor (11).

[0015] The liquid ammonia pumped out of the liquid ammonia auxiliary tank (4) by the in-tank pump (10) is partly transported to the BOG condenser (8) through the outlet of the distributor (11) to provide cold energy for BOG liquefaction, and then connected to the inlet of the stabilizer (13); the other part of the liquid ammonia is connected to the inlet of the stabilizer (13) through the outlet of the distributor (11) and the shut-off valve (12).

[0016] The BOG buffer tank (6) is used to absorb BOG from the liquid ammonia auxiliary tank (4) and the liquid ammonia storage tank (5). After the absorbent in the BOG buffer tank is mixed evenly, it is pressurized by the first compressor (7) and then condensed in the BOG condenser (8), and then enters the gas-liquid separator (9). The liquid output end of the gas-liquid separator (9) is connected to the liquid ammonia auxiliary tank (4), and the gas output end is connected to the inlet of the stabilizer tank (13) in a three-way connection to realize BOG recovery.

[0017] The material output from the stabilizer (13) is increased to the pressure required by the gas purification unit by the booster pump (14), and then enters the first preheater (15) and the second preheater (16) in sequence. After sufficient heat exchange, it enters the ammonia decomposition reactor (17) for decomposition.

[0018] The gas purification module (18) includes an integrated module containing a temperature-switching adsorption device and a palladium membrane separator. It has an outlet one and an outlet two. The high-purity hydrogen gas from the outlet one of the gas purification module is compressed by the second compressor (19) and then enters the hydrogen storage tank (20) for storage, providing fuel for the proton exchange membrane fuel cell (23). The output of the outlet two of the gas purification module is a mixture of partially incompletely converted residual ammonia and incompletely separated hydrogen and nitrogen gas, which is connected to the inlet one of the combustion furnace (22).

[0019] Hydrogen gas in the hydrogen storage tank (20) is regulated to a suitable pressure by the pressure reducing valve (21) and then introduced into the anode inlet of the proton exchange membrane fuel cell (23). The anode outlet of the proton exchange membrane fuel cell (23) is connected to the inlet of the combustion furnace (22) to introduce unconsumed hydrogen fuel into the combustion furnace (22). The combustion furnace (22) provides reaction heat to the ammonia decomposition reactor (17) by burning the unused fuel of the gas purification module (18) and the proton exchange membrane fuel cell (23). The blower (24) sends air into the cathode inlet of the proton exchange membrane fuel cell (23) and exhausts it through the cathode outlet. The electrical energy of the proton exchange membrane fuel cell (23) is converted and processed by the inverter (25) and connected to the load end equipment of the fuel cell unit.

[0020] The load-side equipment of the fuel cell unit includes compressor equipment, booster pump equipment, or marine electrical equipment in the integrated system.

[0021] The heat of the first preheater (15) is provided by the ammonia decomposition products; the heat of the second preheater (16) is provided by the combustion flue gas of the combustion furnace (22).

[0022] The dish-type light-concentrating system is equipped with a beam-splitting device at its light output end. The beam-splitting device includes a reflector or lens for adjusting the light energy distribution ratio between the first light output end and the second light output end.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. This invention employs a dish-type focusing system with an operating temperature of 250-700 ℃, suitable for typical ammonia decomposition, and has a small installation area and high thermal efficiency, making it very suitable for use in ships;

[0025] 2. This invention employs a liquid ammonia auxiliary tank, utilizing the cold energy of the liquid ammonia itself to recover ammonia-bound waste gas (BOG), thus avoiding direct BOG discharge and the excessive energy consumption associated with direct compression processes for BOG treatment. Furthermore, the liquid ammonia auxiliary tank also provides raw materials for the ammonia decomposition reactor and stores excess light resources.

[0026] 3. This invention employs a distributor and a shut-off valve to flexibly adjust the amount of liquid ammonia supplied to the ammonia decomposition reactor from the auxiliary tank based on the amount of BOG generated, thereby improving system stability;

[0027] 4. This invention employs a hydrogen storage tank and a combustion furnace. In the absence of sufficient light resources, hydrogen in the hydrogen storage tank is converted into electrical energy through a hydrogen fuel cell, or into the heat energy required for the ammonia decomposition reaction through a combustion furnace. At the same time, the combustion furnace can burn unused fuel as a heat source for the ammonia decomposition reactor, forming a multi-energy complementarity with solar energy, thereby improving the system's stability and sustainability. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Appendix Figure 1 This is a system schematic diagram of the present invention;

[0030] In the diagram: 1-Disc concentrator system, 2-Paratopic solar collector, 3-Stirling generator, 4-Liquid ammonia auxiliary tank, 5-Liquid ammonia storage tank, 6-BOG buffer tank, 7-First compressor, 8-BOG condenser, 9-Gas-liquid separator, 10-In-tank pump, 11-Distributor, 12-Stop valve, 13-Stabilizer, 14-Booster pump, 15-First preheater, 16-Second preheater, 17-Ammonia decomposition reactor, 18-Gas purification module, 19-Second compressor, 20-Hydrogen storage tank, 21-Pressure reducing valve, 22-Combustion furnace, 23-Proton exchange membrane fuel cell, 24-Blower, 25-Inverter. Detailed Implementation

[0031] As shown in the figure, a solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system includes a power supply device, an ammonia fuel storage unit, a BOG recovery unit, an ammonia decomposition unit, and a fuel cell unit. The power supply device includes a dish-type concentrating system 1. The dish-type concentrating system distributes its concentrated light energy to a first light output terminal connected to a Stirling generator 3 and a second light output terminal connected to a trough solar collector 2. When the integrated system is working, the Stirling generator supplies power to the ammonia fuel storage unit, the BOG recovery unit, the ammonia decomposition unit, or the fuel cell unit under the drive of the input light energy, and the trough solar collector heats the ammonia decomposition reactor 17 of the ammonia decomposition unit.

[0032] The ammonia fuel storage unit includes a liquid ammonia auxiliary tank 4 and a liquid ammonia storage tank 5, with the liquid ammonia auxiliary tank 4 equipped with an in-tank pump 10; the BOG recovery unit includes a BOG buffer tank 6, a first compressor 7, a BOG condenser 8, a gas-liquid separator 9, a distributor 11, a shut-off valve 12, a stabilizing tank 13, and a booster pump 14; the ammonia decomposition unit includes a first preheater 15, a second preheater 16, an ammonia decomposition reactor 17, a gas purification module 18, a second compressor 19, a hydrogen storage tank 20, a pressure reducing valve 21, and a combustion furnace 22; the fuel cell unit includes a proton exchange membrane fuel cell 23, a blower 24, and an inverter 25;

[0033] The liquid ammonia auxiliary tank 4 of the ammonia fuel storage unit is connected to the distributor 11 of the BOG recovery unit via its in-tank pump 10.

[0034] The inlet of the BOG buffer tank 6 of the BOG recovery unit is connected to the liquid ammonia auxiliary tank 4 and the liquid ammonia storage tank 5 through the same pipeline; the outlet of the BOG buffer tank 6 is connected to the first compressor 7 and the gas-liquid separator 9 in sequence, and the pipeline between the compressor 7 and the gas-liquid separator 9 passes through the BOG condenser 8; the liquid output end of the gas-liquid separator 9 is connected to the liquid ammonia auxiliary tank 4; the gas output end of the gas-liquid separator 9 is connected to the inlet of the stabilizing tank 13; the distributor 11 is connected to the in-tank pump 10, and the distributor 11 has an outlet one and an outlet two. The outlet one of the distributor is connected to the BOG condenser 8 and the inlet one of the stabilizing tank 13 in sequence, and the outlet two of the distributor is connected to the inlet two of the stabilizing tank 13. A shut-off valve 12 is provided between the outlet two of the distributor 11 and the inlet two of the stabilizing tank 13.

[0035] The stabilizing tank 13 of the BOG recovery unit is connected to the ammonia decomposition unit via the booster pump 14, and then connected to the ammonia decomposition reactor 17 via the first preheater 15 and the second preheater 16 of the ammonia decomposition unit.

[0036] The decomposition products output from the ammonia decomposition reactor 17 are fed into the gas purification module 18 via the first preheater 15. The gas purification module 18 has an outlet one and an outlet two. The outlet one of the gas purification module is connected to the second compressor 19 and the hydrogen storage tank 20, and the outlet two of the gas purification module is connected to the inlet one of the combustion furnace 22. The outlet of the combustion furnace 22 is connected in sequence to the ammonia decomposition reactor 17 and the second preheater 16.

[0037] The fuel cell unit includes a proton exchange membrane fuel cell 23, a blower 24, and an inverter 25. The hydrogen storage tank 20 is connected to the anode inlet of the proton exchange membrane fuel cell 23, and a pressure reducing valve 21 is provided on the pipeline between the anode inlet of the proton exchange membrane fuel cell 23 and the hydrogen storage tank 20. The anode outlet of the proton exchange membrane fuel cell 23 is connected to the inlet of the combustion furnace 22. The cathode inlet of the proton exchange membrane fuel cell 23 is connected to the blower 24.

[0038] The bottom of the liquid ammonia auxiliary tank 4 is equipped with an in-tank pump 10, which is used to pump the liquid ammonia in the tank to the distributor 11.

[0039] The liquid ammonia pumped out by the in-tank pump 10 from the liquid ammonia auxiliary tank 4 is partly transported to the BOG condenser 8 through the outlet of the distributor 11 to provide cold energy for BOG liquefaction, and then connected to the inlet of the stabilizing tank 13; the other part of the liquid ammonia is connected to the inlet of the stabilizing tank 13 through the outlet of the distributor 11 and the shut-off valve 12.

[0040] The BOG buffer tank 6 is used to absorb BOG from the liquid ammonia auxiliary tank 4 and the liquid ammonia storage tank 5. After the absorbent in the BOG buffer tank is mixed evenly, it is pressurized by the first compressor 7 and then condensed in the BOG condenser 8, and then enters the gas-liquid separator 9. The liquid output end of the gas-liquid separator 9 is connected to the liquid ammonia auxiliary tank 4, and the gas output end is connected to the inlet of the stabilizing tank 13 in a three-way connection to realize BOG recovery.

[0041] The material output from the stabilizer tank 13 is boosted to the pressure required by the gas purification unit by the booster pump 14, and then enters the first preheater 15 and the second preheater 16 in sequence. After sufficient heat exchange, it enters the ammonia decomposition reactor 17 for decomposition.

[0042] The gas purification module 18 includes an integrated module containing a temperature-switching adsorption device and a palladium membrane separator, and has an outlet one and an outlet two. The high-purity hydrogen gas from the outlet one of the gas purification module is compressed by the second compressor 19 and then enters the hydrogen storage tank 20 for storage, providing fuel for the proton exchange membrane fuel cell 23. The output of the outlet two of the gas purification module is a mixture of partially incompletely converted residual ammonia and incompletely separated hydrogen and nitrogen gas, which is connected to the inlet one of the combustion furnace 22.

[0043] Hydrogen gas in the hydrogen storage tank 20 is regulated to a suitable pressure by the pressure reducing valve 21 and then introduced into the anode inlet of the proton exchange membrane fuel cell 23. The anode outlet of the proton exchange membrane fuel cell 23 is connected to the inlet of the combustion furnace 22, allowing unconsumed hydrogen fuel to be introduced into the combustion furnace 22. The combustion furnace 22 provides reaction heat to the ammonia decomposition reactor 17 by burning the unused fuel from the gas purification module 18 and the proton exchange membrane fuel cell 23. The blower 24 sends air into the cathode inlet of the proton exchange membrane fuel cell 23 and exhausts it through the cathode outlet. The electrical energy of the proton exchange membrane fuel cell 23 is converted and processed by the inverter 25 and connected to the load end equipment of the fuel cell unit.

[0044] The load-side equipment of the fuel cell unit includes compressor equipment, booster pump equipment, or marine electrical equipment in the integrated system.

[0045] The heat of the first preheater 15 is provided by the ammonia decomposition products; the heat of the second preheater 16 is provided by the combustion flue gas of the combustion furnace 22.

[0046] The dish-type light-concentrating system is equipped with a beam-splitting device at its light output end. The beam-splitting device includes a reflector or lens for adjusting the light energy distribution ratio between the first light output end and the second light output end.

[0047] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A solar-driven integrated system for shipborne ammonia decomposition to produce hydrogen and BOG recovery, characterized in that: The system includes power supply equipment, an ammonia fuel storage unit, a BOG recovery unit, an ammonia decomposition unit, and a fuel cell unit. The power supply equipment includes a dish-type concentrating system. The dish-type concentrating system distributes its concentrated light energy to a first light output terminal connected to a Stirling generator and a second light output terminal connected to a trough solar collector. When the integrated system is working, the Stirling generator, driven by the input light energy, supplies power to the ammonia fuel storage unit, the BOG recovery unit, the ammonia decomposition unit, or the fuel cell unit, while the trough solar collector heats the ammonia decomposition reactor of the ammonia decomposition unit. The ammonia fuel storage unit includes a liquid ammonia auxiliary tank and a liquid ammonia storage tank, with the liquid ammonia auxiliary tank equipped with an in-tank pump; the BOG recovery unit includes a BOG buffer tank, a first compressor, a BOG condenser, a gas-liquid separator, a distributor, a shut-off valve, a stabilizing tank, and a booster pump; the ammonia decomposition unit includes a first preheater, a second preheater, an ammonia decomposition reactor, a gas purification module, a second compressor, a hydrogen storage tank, a pressure reducing valve, and a combustion furnace; the fuel cell unit includes a proton exchange membrane fuel cell, a blower, and an inverter; The liquid ammonia auxiliary tank of the ammonia fuel storage unit is connected to the distributor of the BOG recovery unit via its in-tank pump. The inlet of the BOG buffer tank of the BOG recovery unit is connected to the liquid ammonia auxiliary tank and the liquid ammonia storage tank through the same pipeline; the outlet of the BOG buffer tank is connected to the first compressor and the gas-liquid separator in sequence, and the pipeline between the first compressor and the gas-liquid separator passes through the BOG condenser; the liquid output end of the gas-liquid separator is connected to the liquid ammonia auxiliary tank; the gas output end of the gas-liquid separator is connected to the inlet three of the stabilizing tank; the distributor is connected to the in-tank pump, and the distributor has an outlet one and an outlet two. The outlet one of the distributor is connected to the BOG condenser and the inlet one of the stabilizing tank in sequence, and the outlet two of the distributor is connected to the inlet two of the stabilizing tank. A shut-off valve is provided between the outlet two of the distributor and the inlet two of the stabilizing tank. The stabilization tank of the BOG recovery unit is connected to the ammonia decomposition unit via a booster pump, and then connected to the ammonia decomposition reactor via the first preheater and the second preheater of the ammonia decomposition unit. The decomposition products output from the ammonia decomposition reactor are fed into the gas purification module via the first preheater. The gas purification module has an outlet one and an outlet two. The outlet one of the gas purification module is connected to the second compressor and the hydrogen storage tank, and the outlet two of the gas purification module is connected to the inlet one of the combustion furnace. The outlet of the combustion furnace is connected in sequence to the ammonia decomposition reactor and the second preheater. The fuel cell unit includes a proton exchange membrane fuel cell, a blower, and an inverter. The hydrogen storage tank is connected to the anode inlet of the proton exchange membrane fuel cell, and a pressure reducing valve is provided on the pipeline between the anode inlet of the proton exchange membrane fuel cell and the hydrogen storage tank. The anode outlet of the proton exchange membrane fuel cell is connected to the inlet of the combustion furnace. The cathode inlet of the proton exchange membrane fuel cell is connected to the blower.

2. The solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system according to claim 1, characterized in that: An in-tank pump is installed at the bottom of the liquid ammonia auxiliary tank to pump the liquid ammonia inside the tank to the distributor.

3. The solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system according to claim 1, characterized in that: The gas purification module includes an integrated module containing a temperature-switching adsorption device and a palladium membrane separator, and has an outlet one and an outlet two. The high-purity hydrogen gas from outlet one of the gas purification module is compressed by a second compressor and then stored in the hydrogen storage tank to provide fuel for the proton exchange membrane fuel cell. The output of outlet two of the gas purification module is a mixture of partially incompletely converted residual ammonia and incompletely separated hydrogen and nitrogen gas, which is connected to inlet one of the combustion furnace.

4. The solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system according to claim 3, characterized in that: Hydrogen gas in the hydrogen storage tank is regulated to a suitable pressure by the pressure reducing valve and then introduced into the anode inlet of the proton exchange membrane fuel cell. The anode outlet of the proton exchange membrane fuel cell is connected to the inlet of the combustion furnace, allowing unconsumed hydrogen fuel to be introduced into the combustion furnace. The combustion furnace provides reaction heat to the ammonia decomposition reactor by burning the unused fuel from the gas purification module and the proton exchange membrane fuel cell. The blower sends air into the cathode inlet of the proton exchange membrane fuel cell and exhausts it through the cathode outlet. The electrical energy of the proton exchange membrane fuel cell is converted and processed by the inverter and connected to the load-side equipment of the fuel cell unit. The load-side equipment of the fuel cell unit includes a compressor and a booster pump in the integrated system.

5. A solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system according to claim 3 or 4, characterized in that: The heat of the first preheater is provided by the ammonia decomposition products; the heat of the second preheater is provided by the combustion flue gas of the combustion furnace.

6. The solar-driven shipborne ammonia decomposition hydrogen production and BOG recovery integrated system according to claim 1, characterized in that: The dish-type light-concentrating system is equipped with a beam-splitting device at its light output end. The beam-splitting device includes a reflector or lens for adjusting the light energy distribution ratio between the first light output end and the second light output end.

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