Device and method for accurately measuring flue gas temperature field in front of low-temperature reheater of large coal-fired boiler

Abstract

The invention relates to a device for accurately measuring a flue gas temperature field in front of a low-temperature reheater of a large coal-fired boiler. The device comprises a measuring section, athermocouple, fins and fin holes. The measuring section is a rectangular surface in the horizontal rectangular flue and is arranged at the section position behind the high-temperature reheater and infront of the low-temperature reheater of the horizontal flue at the outlet of the boiler furnace. Fins are arranged on the boiler horizontal flue side wall enclosure pipe, and a plurality of fin holes are formed in the fins. The device has the beneficial effects that the problems that in existing boiler design, a low-temperature reheater front smoke temperature accurate measuring device is not arranged, boiler combustion in the low-load period is influenced, and consequently overtemperature of a vertical pipe section pipe bundle of a low-temperature reheater is serious are solved. The flue gas temperature measurement accuracy can be improved, accurate temperature measurement data are provided for follow-up boiler combustion control, the flue gas temperature in front of the low-temperaturereheater is controlled within a proper range, and it is guaranteed that the temperature of a vertical pipe section of the low-temperature reheater is normal.

Description

technical field [0001] The invention relates to the technical field of ultra-supercritical coal-fired boilers, in particular to a device and method for accurately measuring the flue gas temperature field before a low-temperature reheater of a large-scale coal-fired boiler. Background technique [0002] With the development of my country's economy, the society's demand for electric energy continues to grow, the capacity of the power grid continues to expand, the structure of power consumption has undergone great changes, and the peak-to-valley difference between major power grids is increasing day by day. In recent years, with the rapid development of new energy technologies, various new clean energy sources such as hydropower, wind energy, solar energy, biomass energy and ocean energy have been widely promoted and applied and connected to the grid for power generation. The contradiction between them is becoming increasingly acute, especially the problem of lack of effective ...

AI Technical Summary

Problems solved by technology

At present, no precise measuring device for the flue gas temperature before the low-temperature reheater is installed in the design of the boiler, so that the operator cannot grasp the specific temperature at this position, which affects the combustion control of the boiler during the low-load period, and may easily cause the flue gas temperature before the low-temperature reheater during the low-load period High and low temperature reheater vertical pipe bundle overtemperature serious situation

Images