Method for avoiding temperature internal pinch point problem in S-CO2 low-temperature regenerative system

The invention relates to a method for avoiding the temperature internal pinch point problem in an S-CO2 low-temperature heat regeneration system, the S-CO2 low-temperature heat regeneration system comprises a low-temperature heat regenerator, a high-pressure tube bundle and a low-pressure tube bundle are arranged in the low-temperature heat regenerator, a first fluid flows into the high-pressure tube bundle, a second fluid flows into the low-pressure tube bundle, and the first fluid flows into the low-pressure tube bundle; the temperature of the inlet end of the high-pressure tube bundle is lower than that of the inlet end of the low-pressure tube bundle; the method comprises the steps that first fluid in the low-temperature heat regenerator is subjected to middle flow division, so that the heat capacity flow rate of the first fluid in the low-temperature heat regenerator is kept smaller than that of second fluid. According to the low-temperature heat regenerator, the problem of internal pinch points possibly