Co2 working fluid split flow and drag reduction system for supercritical co2 Brayton cycle coal-fired power boiler

Abstract

The invention belongs to the field of efficient power generation equipment, and discloses a CO2 working medium flow dividing and resistance reducing system of a supercritical CO2 Bretton circulation coal-fired power generation boiler. The system comprises a first cooling wall, a second cooling wall, a first superheater, a second superheater, a coal economizer, a first turbine, a reheating arrangement system and a compression system. The reheating arrangement system feeds an input working medium into the boiler for absorbing heat and then applies work. By means of the compression system, the temperature and mass flow of the working medium at an inlet of the boiler are further reduced. A main flow heated face in the boiler is divided into a plurality of parts, and therefore the effects thatthe circulation efficiency is improved, the temperature is easier to adjust and the flue gas temperature is additionally reduced are achieved on the basis that the boiler interior pressure drop is greatly ensured. Multiple key problems of supercritical CO2 Bretton circulation and coal-fired power generation coupling are solved, system arrangement is simple, operation parameters are stable, and thethermodynamic system and boiler efficiency is high.

Description

technical field [0001] The invention belongs to the field of high-efficiency power generation equipment, in particular to a supercritical CO 2 CO of Brayton cycle coal-fired power boiler 2 Working fluid diversion drag reduction system. technical background [0002] As a primary energy source, coal plays an important role in the global energy structure. It has large reserves, is easy to mine, and has rich experience in use. Taking China as an example, coal accounts for 75% of China's primary energy consumption structure, accounting for the world's total coal consumption. a quarter of. Especially in the power sector, thermal power units account for more than 70% of the total installed capacity, most of which are coal-fired steam turbine power stations. However, the use of coal has increased the burden on environmental protection and the greenhouse effect. Under such circumstances, the development of advanced power cycle technology to improve unit performance is of great sig...

AI Technical Summary

Problems solved by technology

The intercooling will reduce the power consumption of the compressor, and at the same time, it will appropriately reduce the temperature of the working fluid at the boiler inlet, which can be reduced by about 5°C under the calculated working conditions, but the intercooling will have an impact on the operating characteristics of the low temperature regenerator

Heat recovery can reduce the loss of cold source and improve cycle efficiency, especially the shunt recompression heat recovery arrangement, and make the heat capacity of the working fluid on the cold and hot sides of the low-temperature regenerator close to each other, improving the heat recovery effect, but the heat recovery will also increase the CO 2 The temperature of the working fluid at the boiler inlet

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