A gas turbine exhaust system

Abstract

The invention discloses an exhaust system of a gas turbine. The exhaust system comprises a shell, a sealing member, connecting pieces, a support, a pedestal, a heat dissipation layer, an isolating layer, a pad and a pressing plate, wherein the shell is of a transverse cylindrical steel plate structure with a big end and a small end and is assembled and connected by the connecting pieces; the sealing member is arranged on the inner edge of an inlet in the small end of the shell; the upper end of the support is connected below the transverse shell, and the lower end of the support is connected with the pedestal; the heat dissipation layer is tightly attached to the inner wall of the shell; the isolating layer is connected with the heat dissipation layer and is laid along the side wall; the pad is arranged on the other side of the isolating layer and is fixedly connected through the pressing plate by using bolts and nuts. According to the product, the heat efficiency can be integrally improved, the thermal stress produced by non-uniform heating on a heated surface is relieved, stress concentration is avoided, and the safety of operation is improved; meanwhile, the failure condition in operation of the conventional products can also be eliminated, and the product cost is reduced and the development period is shortened on the premise of guaranteeing the product quality.

Description

technical field [0001] The invention belongs to the technical field of gas turbines, and relates to a gas turbine exhaust system. Background technique [0002] Due to the rapid development of my country's economy, the demand for electric energy continues to grow, but with the increasingly serious problem of global warming and the increasingly scarce mineral resources, the demand for various clean energy is particularly important. [0003] Gas turbine combined cycle (GTCC), also known as gas-steam combined cycle, refers to a power generation method that combines gas turbines and steam turbines, mainly consisting of gas turbines (compressors, combustion chambers, turbines, control systems and auxiliary systems), It consists of three parts: waste heat boiler and steam turbine. The compressor inhales and compresses the air and sends it into the combustion chamber, so that the fuel (oil or natural gas) is burned to produce high-temperature and high-pressure gas, which enters the...

AI Technical Summary

Problems solved by technology

If the structural design of the exhaust system is unreasonable, resonance occurs or fails due to insufficient strength, it will cause a large displacement of the exhaust system, and the gas turbine cannot be discharged smoothly, which will affect the normal operation of the gas turbine, thereby reducing the efficiency of the gas turbine and even causing the shutdown of the gas turbine

Similarly, if the thermal design is unreasonable, it will cause overheating of the exhaust system casing and even gas leakage, which will endanger personal safety and cause the shutdown of the gas turbine

Due to the particularity of the power industry, the unplanned downtime of gas turbines will not only affect the economic benefits of the power plant itself, but also have an impact on the power grid. Timely downtime is likely to cause regional power outages, which will affect people's production and life

Images