Novel supercritical carbon dioxide coal-fired boiler

Abstract

The invention discloses a novel supercritical carbon dioxide coal-fired boiler. The novel supercritical carbon dioxide coal-fired boiler comprises a horizontally arranged hearth, a wall-attached radiation cooling heating surface system, a superheater and reheater system, smoke gas coolers and air preheaters, wherein the wall-attached radiation cooling heating surface system is arranged in the hearth in a graded and segmented mode, the superheater and reheater system is arranged in a horizontal flue in a graded mode, and the smoke gas coolers and the air preheaters are arranged in a tail flue in a graded and flow-dividing mode. The wall-attached radiation cooling heating surface system greatly reduces the length of a high-temperature working medium pipeline, and reduces the number of needed high-temperature convection heating surfaces and high-temperature alloy pipelines, thereby reducing fixed investment of equipment. The superheater and reheater system combines with turbines which are arranged in a multi-stage and multi-axis mode, so the air inlet temperature and the turbine efficiency of the turbine of each grade can be improved. The tail flue comprises an upper-grade smoke gas coal economizer and a lower-grade smoke gas coal economizer which are used for heating a new working medium to meet requirements of an inlet of a primary wall-attached radiation cooling heating surface of the boiler, and the upper-grade air preheater and the lower-grade air preheater are used for heating combustion air, so that the special requirements for hearth combustion and heat transfer of the supercritical working medium circulation are met.

Description

technical field [0001] The invention belongs to the field of advanced high-efficiency power generation equipment, and in particular relates to a novel supercritical carbon dioxide coal-fired boiler. Background technique [0002] Continuously improving the efficiency of generator sets is the eternal theme and goal of power industry research. The traditional energy conversion system based on the steam Rankine cycle needs to increase the steam parameters to 700°C to achieve an efficiency of about 50%. Therefore, it is necessary to spend high economic and time costs to develop new nickel-based superalloys. In order to break through the bottleneck of the traditional route, some advanced power systems with new concepts have received more and more attention. Supercritical working fluid has inherent advantages such as high energy density, high heat transfer efficiency, and simple system, which can greatly improve the heat-to-power conversion efficiency and reduce energy consumption....

AI Technical Summary

Problems solved by technology

However, most of the existing patents are preliminary conceptual designs for new energy sources such as solar energy. There is a lack of practical and efficient power generation systems for traditional fossil energy, especially coal-fired power generation. In order to achieve the expected goals of the new system, the core components of the system still need a lot of Original research work, supercritical carbon dioxide coal-fired boiler is the core component of a new coal-based supercritical carbon dioxide power cycle, and there are no related patents and research results so far

Images