1. Adjust the temperature of superheated steam
Adjusting the superheated steam temperature of industrial gas steam boiler is generally based on water spray and temperature reduction, which is used as a means of fine adjustment. The temperature reducer is arranged at two or more levels to adjust the steam temperature by changing the amount of water injected. In addition, the inclination angle of the burner and the shutdown of the upper and lower nozzles can be changed, and the air distribution condition can be changed to change the position of the flame center as a rough adjustment means, so as to achieve the purpose of steam temperature regulation.
2. Adjust the reheat steam temperature
There are four methods to adjust the reheat steam temperature: flue gas recycling, separating flue baffle, steam first steam heat exchanger and changing flame center height. By using the recirculation fan, part of the low temperature flue gas after the economizer is extracted and then fed into the furnace from near the cold ash hopper in order to change the endothermic ratio of the radiation heating surface to the convective heating surface. For the reheater arranged in the convective flue, when the load decreases, the reheat steam temperature decreases, which can increase the amount of recirculation smoke, increase the heat absorption of the reheater, and keep the reheat steam temperature unchanged.
The tail flue is divided into two parallel flue by partition wall, superheater and reheater are arranged respectively in the two flue, and the flue baffle is installed after the coal economizer of the parallel flue. Adjusting the opening of the baffle can change the flue gas flow through the two flue. In order to adjust the reheat steam temperature. Steam first steam heat exchanger is a kind of equipment which uses superheated steam to heat reheated steam to adjust the temperature of reheated steam. For industrial gas steam boilers with wall reheater and semi-radiation reheater, the reheat steam temperature can be adjusted by changing the height of furnace flame center. In addition, the reheater also set up a small amount of water spray as an auxiliary fine adjustment means.
