From the perspective of operation, what are the main measures to reduce boiler coal consumption?

Now when it comes to reducing coal consumption, there are probably several schools. Combustion optimization based on intelligent monitoring hardware, such as the American Zuo furnace product series, furnace plane temperature distribution, need to install a large number of hardware probes, the cost is relatively high, of course, there are a lot of pulverized coal monitoring hardware, pulverized coal fineness monitoring hardware, air powder ratio hardware; The combustion optimization model based on combustion mechanism is widely used in major research institutions, but it is only limited to rated working conditions or fixed furnace types, and has low adaptability. There is also an expert experience model based on combustion experience, which requires a large amount of expert experience as the support, needs to carry out different weight ratios, subjective factors are larger, and there is a combustion optimization based on big data mining and analysis, and the optimization principle is to select the best adjustment method for each working condition in a large number of historical working conditions. This optimization strategy not only has no investment in hardware costs, but also is closer to the equipment working environment, high operability, according to incomplete statistics, this combustion optimization mode can reduce the minimum 2g standard coal, if you are interested, you can @ me (comments are also OK).

Do a good job of surface insulation of the outlet pipe or steam pipe, use the device to reduce the flue gas temperature of the boiler flue gas outlet, the hot water heated by the heat after the first heat can be used for the boiler water replenishment, adjust the ratio of the air volume of the drum and induced draft fan to make the fuel fully combusted, and open the large furnace door less when observing the combustion condition in the furnace, and only check from the fire viewing port.

Maintain an appropriate amount of excess air, reduce the exhaust gas temperature, keep the heating surface such as economizer and air preheater clean, and prevent coking and dust accumulation. In addition, a waste heat ** device can be installed.

(1) Reduce the amount of smoke emitted. Maintain the proper amount of excess air to reduce boiler air leakage.

2) Reduce the exhaust gas temperature, keep the heating surface clean, and prevent coking and dust accumulation.

3) Reduce air leakage in the milling system.

Maintain proper furnace pressure. Reduces air leakage. Ensure the gradation of coal or the fineness of pulverized coal. Maintain proper exhaust temperature.

Answer] :(1) The decrease of volatile matter in coal will increase the excess air coefficient, reduce the lead of the theoretical combustion temperature source, decrease the flue gas temperature of the furnace, insufficient radiative heat exchange, and decrease the heat absorption of the heating surface such as the water wall and front screen.

2) In order to make the boiler evaporation reach the rated value, more fuel and air must be put in according to the same air-fuel ratio, and the total flue gas of the boiler has increased at this time.

How boiler efficiency changes when boiler load decreases.

Pro, because each Huai or accompanying boiler has an economic load range, generally in the boiler rated load of 75% 90% or so, more than this load, the efficiency should be reduced, below this load, the efficiency should also decrease, because the furnace and flue volume of each boiler is fixed, when the rated load is exceeded, the fuel will stay in the furnace for too short a time, not enough time will only be taken out of the furnace, resulting in Q4 heat loss increase; Due to the excessive flue gas volume, the flue gas velocity and smoke temperature group type are greater than the normal value, resulting in large flue gas loss and reduced efficiency. In low-load operation, the boiler efficiency will also decrease due to the fact that the temperature of the furnace lead chamber drops more, the combustion disturbance is weakened, and the heat loss of incomplete combustion of solids increases.