Waste heat-to-steam supply system and steam supply method for alkaline electrolytic cells

A waste heat-to-steam supply system for alkaline electrolytic cells, comprising:

• a waste heat recovery module, including an alkaline electrolysis unit and a cooliing unit;
• the alkaline electrolysis unit is provided with cooling water, and the cooling unit is provided with a heat transfer medium;
• the cooling unit is connected to the alkaline electrolysis unit, and is configured to introduce the cooling water into the cooling unit to heat the heat transfer medium;
• a heat pump module, including a first power supply unit, a second power supply unit, an electric motor, and a compressor;
• the first power supply unit and the second power supply unit are respectively electrically connected to the electric motor;
• the first power supply unit provides green electricity and discarded photovoltaic power, and the second power supply unit provides electric energy as a backup when the first power supply unit does not work;
• the electric motor is connected to the compressor, and the compressor is connected to the cooling unit, so that the heated heat transfer medium in the cooling unit is introduced into the compressor for compression and heating;
• and the first power supply unit comprises a main power grid, a transformer, and a first circuit breaker;
• the main power grid provides green electricity and discarded photovoltaic power, and the main power grid, transformer, first circuit breaker, and electric motor are connected in sequence;the second power supply unit comprises an electrochemical energy storage device and a second circuit breaker;
• the electrochemical energy storage device provides stored electrochemical reaction electricity, and the electrochemical energy storage device, second circuit breaker, and electric motor are connected in sequence;
• a steam generation and supply module, comprising a steam generation unit and a steam supply unit;
• the steam generation unit is connected to the compressor, so that the compressed and heated heat transfer medium is introduced into the steam generation unit;
• the steam generation unit is connected to the steam supply unit, so that the heat network feedwater from the outlet of the steam supply unit is introduced into the steam generation
• unit, heated and evaporated by the heat transfer medium to generate industrial steam, and then provided it to the steam supply unit:
• the steam generation unit is further connected to the cooling unit, so that the cooled heat transfer medium in the steam generation unit circulates back to the cooling unit and is heated by the low-temperature water of the alkaline electrolysis unit;the heat pump module further comprises a heat regenerator;
• the cooling unit is connected to the compressor via the heat regenerator, so that the heated heat transfer medium in the cooling unit passes through the heat regenerator before being introduced into the compressor;
• the steam generation unit is connected to the cooling unit via the heat regenerator, so that the cooled heat transfer medium in the steam generation unit passes through the heat regenerator, heats the heat transfer medium introduced from the cooling unit, and then is returned to the cooling unit;the heat pump module further comprises an expander;
• the expander is coaxially connected to the drive shaft of the compressor, and the expander is connected to the drive end of the electric motor;
• andThe heat regenerator is connected to the cooling unit via the expander, so that the cooled heat transfer medium in the heat regenerator is introduced into the expander to recover the pressure potential energy and thermal energy, and then introduced into the cooling unit.