1. optimize the wind pressure set value
Usually, an initial value of the primary wind pressure setting value should be given preliminarily before the boiler is officially started. When the boiler is officially started, with the increase of unit load, the primary air volume will also increase, and the primary air duct pressure will also change. When the opening of the hot air baffle in the pulverizer system is less than 50%, the primary air pressure setting value can be reduced appropriately at this time. When the > is 80%, it is necessary to increase the wind pressure set value.
2. Adjust the burner to swing the nozzle properly
By adjusting the position of the burner nozzle, the purpose of automatic value setting is achieved. First of all, the nozzle Angle can be adjusted according to the internal flue gas temperature of the boiler. When the Angle is large, it will increase the burden of solid combustion and cause greater heat loss. However, a smaller inclination will result in a larger amount of residue accumulation, so it is necessary to find the best inclination by adhering to the principle of scientific adjustment. Secondly, the rotation rate of the burner nozzle can be adjusted to realize the synchronous operation of the air flow and avoid the uneven distribution of the air structure inside the boiler. Finally, the position of the burner nozzle can also be placed in accordance with the law of "upper group lower group upper group", so that the heat load of the main combustion area is reduced.
3. Scientific arrangement of cyclone burner
The cyclone burner is actually a new type of boiler burner, which is mainly composed of secondary air duct, primary air duct and cyclone. In order to ensure the timeliness of pulverized coal boiler combustion, the swirl burner can be optimized according to the following contents:
(1) The corresponding primary wind speed is designed for different kinds of coal to avoid the occurrence of local backflow area inside, which affects the combustion quality.
(2) The swirl intensity can be adjusted. When the swirl intensity of the swirl burner in the boiler is weakened, it will have an impact on the combustion degree, so it needs to be adjusted appropriately according to the actual situation.
4. Determine the secondary air damper setting value
When optimizing the automatic setting value, it is necessary to further determine the secondary air small damper setting value. The secondary air small damper plays an important role in pulverized coal boiler, which can effectively reduce the influence caused by the obstruction to the operation of the coal mill. When optimizing it, it can be carried out from the following two aspects:
(1) the adaptability of the burner in pulverized coal boiler can be appropriately enhanced, and the internal combustion effect can be better by using the way of circumferential wind. On the one hand, the perimeter wind can scientifically control the combustion rate of high-quality bituminous coal, so that it will not burn all the fuel prematurely, resulting in a shorter combustion time of the boiler. Therefore, if the quality of bituminous coal used in pulverized coal boilers is high, the circumferential air volume can be appropriately increased; On the other hand, the circumferential wind can reduce the concentration of pulverized coal. Therefore, for anthracite or coal with poor volatility, the circumferential air volume should be lowered to promote the development of coal combustion in the boiler to stabilize.
(2) the combustion of pulverized coal boiler needs reasonable use of auxiliary wind, which can adjust the wind direction in the boiler. When the momentum in the boiler is relatively small, it is not conducive to the smooth combustion of coal. On the contrary, the pulverized coal in the boiler will be separated from it, which affects the actual combustion quality and leads to more residue.
How a bowl of Baixiang good noodles is born? About 1.8 million years ago, humans learned to cook food with purposeful control of fire. The use of fire has made unprecedented progress in human health and life, and Darwin also called cooking the most important invention of mankind after language....
Heat delivers real deliciousness. In recent years, China's kimchi industry has grown rapidly, with a market size of more than 40 billion. With the gradual rise of the "stay-at-home economy", Chinese compound condiments and prepared dishes have become new trends in the industry....