Sinter waste heat recovery and utilization system based on CO2 transcritical cycle

Abstract

The invention discloses a sinter waste heat recovery and utilization system based on CO2 transcritical cycle, comprising a sinter waste heat recovery system, a CO2 transcritical cycle power generationsystem and a hot water recovery system; cold air contacts with the sinter to exchange heat, absorb heat and raise temperature; after dust removal, the cold air exchanges heat with a CO2 working medium and cooling water through a first heat exchanger and a second heat exchanger, and then the cold air is blown into a vertical tank through a fan; the CO2 working medium in the CO2 transcritical cyclepower generation system absorbs heat and warms up through the first heat exchanger, enters an expander to do work under a state of high temperature and high pressure to drive the generator to generate electricity, exhausted gas is pressurized by a pump after condensation, and exchanges heat through a heat regenerator and the first heat exchanger to complete the cycle; the cooling water entering the second heat exchanger and a condenser in the hot water recovery system absorbs heat and heats up and then mixes in a mixer to provide domestic hot water. The system can work circularly, so the resources can be used repeatedly; the system has higher waste heat recovery and utilization rate, and effectively reduces the energy consumption in a sintering process; the system is reasonable and efficient, and the equipment is simple and easy to operate.

Description

Technical field [0001] The invention belongs to the field of metallurgical waste heat recovery and utilization, and relates to a CO 2 Transcritical cycle sinter waste heat recovery and utilization system. Background technique [0002] Efficient recovery and utilization of waste heat resources in the sintering process is one of the main measures to further reduce the energy consumption of the sintering process. The temperature at the end of the sintering machine is about 800℃~950℃. The sensible heat carried by the sinter (that is, the sensible heat of the sinter) ) About 70% of the total waste heat resources of the sintering process. After the sintered ore is crushed and screened, the temperature when it enters the cooling equipment is about 650°C to 700°C, and its heat quality is still high. Based on this, the efficient recovery and utilization of sensible heat of sintering is the core and focus of the entire sintering waste heat recovery and utilization. [0003] The vertical ta...

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Problems solved by technology

The current sinter waste heat power generation generally adopts the waste heat boiler-steam turbine system. The steam production efficiency of the waste heat boiler is low, and the "quantity" and "quality" of steam fluctuate greatly. Therefore, finding a suitable heat exchange medium is a problem that plagues the engineering community.

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