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Question:

How to form, deal with and protect low temperature coking and high temperature coking of circulating fluidized bed boiler?

How to form, deal with and protect low temperature coking and high temperature coking of circulating fluidized bed boiler?

Answer:

The local temperature is too high and the instrument indicates the normal temperature. In the combustion chamber, the local material flow is not normal, and the circulating ash is mixed or mixed with the fuel, and the heat released by the fuel can not be taken away in time. In the material layer of the uneven temperature field (even if the flow is normal, in the material layer and the temperature difference is there, but more close to the average value of the instrument, the daily operation indicates the temperature is not entirely consistent), flow abnormal parts distance temperature element relatively far, can not reflect the actual situation such as real local temperature. All temperature indications do not indicate excessive temperature. Coking at this time is low temperature coking. Boiler combustion chamber coking is mostly low temperature coking, generally occurred in the start and stop furnace, pressure, fire, fire, low load, poor coal (coal particle size and calorific value).
The reason of overheating of the fuel heat released in the combustion chamber, combustion, circulating ash into the mixing chamber and the fuel combustion device to absorb heat and heat from the combustion chamber, under normal circumstances, the relationship between them is balanced, the temperature of the combustion chamber will remain constant. The temperature of the combustion chamber rises only when the heat can not be taken out in time.
The circulating fluidized bed boiler in high temperature or low temperature coking coking refers to the instrument temperature (i.e. furnace temperature), high temperature or low temperature regardless of the actual coking coking, coking coking temperature temperatures in the region are more than ash (high to coal).
Overall over temperature, instrument temperature over temperature. This is the high temperature coking. When the feeder does not return the material suddenly, the coal quality changes suddenly, the fuel in the furnace is gathered in oxygen, and when the combustion is suddenly increased, the ventilation rate will happen. Handling in time is generally avoided. This is the least coking phenomenon. Even a large area of coke, but also mostly by low-temperature coking treatment improper or not timely. The temperature at which the first coke was deposited has been lowered by a single blow.
Local over temperature, instrument indicating overtemperature. In the combustion chamber, the local material flow is not normal, and the circulating ash is mixed or mixed with the fuel, and the heat released by the fuel can not be taken away in time. Over temperature or junction focus is just at the temperature measuring element. The temperature indication can reflect the actual temperature. This phenomenon of coking rarely occurs independently because the supervisor does not wait for the temperature to rise to the specified value. Therefore, this situation is generally caused by the gradual deterioration of low-temperature coking, coke blocks extended to the temperature sensor near the cause. The temperature element is coke when surrounded by a large open air temperature indicating a rapid decline or decline is very slow, Guan Xiaoyi wind, temperature indicating a rapid rise or rise very slowly as compared with other temperature indicating obvious abnormal temperature indicating this point, there may be a coke. The instrument indicated that the temperature rarely exceeded the coking temperature.

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