A process for returning material and ash to a fluidized bed boiler

Abstract

The invention discloses a process for material returning and ash discharging of a fluidized bed boiler. After ash discharging of a loop seal is completed, ash cooling is started, an ash discharging pipe is a water cooling jacket tube, and a cooling water pipe which is connected with a cooling water main pipe is arranged between the inner layer and the outer layer of the water cooling jacket pipe;cooling water enters the cooling water pipe from the bottom of the water cooling jacket pipe through the main pipe and then enters a buffer tank for containing the loop seal through the cooling waterpipe; and the ash discharging pipe is inserted into the buffer tank to prevent the loop seat subjected to heat expansion from being blocked. According to the process of material returning and ash discharging, the boiler thermal efficiency can be improved, the slag discharge amount of a hearth is reduced, the probability that large-particle unfired coal is directly discharged from a slag dischargepipe can be reduced, and the safe and economical operation of the boiler can be guaranteed; an ash cooler is installed so that the bed temperature and the efficiency of the boiler can be improved, andthe safety coefficient of manual ash discharging can be improved; by adjusting the rotating speed of the ash cooler is adjusted, the differential pressure of the hearth is controlled to be 1400Pa, the bed temperature is stabilized, four workers are reduced, if each worker is provided with 5000 yuan each month, and the manual cost can be reduced by 20 thousand yuan per month; and the secondary pollution of on-site dust is avoided, and the operation efficiency of the boiler is improved.

Description

technical field [0001] The invention relates to a boiler technology, in particular to a process for feeding and ash-releasing a fluidized bed boiler. Background technique [0002] In order to meet the requirements of the national environmental protection policy, the latest generation of circulating fluidized bed boilers is equipped with a separator with high separation efficiency. Compared with the previous separator, the separation efficiency of the improved separator is not at the same level. Fluidized bed boilers can achieve environmental protection, energy saving, and high efficiency without losing the characteristics of traditional circulating fluidized bed coal types, strong adaptability, and strong load adjustment capabilities. Combustion in a fluidized bed boiler is a complex low-temperature combustion technology. During operation, the differential pressure control of the furnace is very critical. If the differential pressure is high, the bed temperature will drop, t...

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Problems solved by technology

[0002] In order to meet the requirements of the national environmental protection policy, the latest generation of circulating fluidized bed boilers is equipped with a separator with high separation efficiency. Compared with the previous separator, the separation efficiency of the improved separator is not at the same level. Fluidized bed boilers can achieve environmental protection, energy saving, and high efficiency without losing the characteristics of traditional circulating fluidized bed coal types, strong adaptability, and strong load adjustment capabilities. Combustion in a fluidized bed boiler is a complex low-temperature combustion technology. During operation, the differential pressure control of the furnace is very critical. If the differential pressure is high, the bed temperature will drop, the combustion efficiency will decrease, and the differential pressure will be low. The bed temperature is high, it is easy to coke, and the boiler is difficult to load. The function of the ash discharge tube of the return leg designed by the general boiler is: 1) When the boiler is abnormal, the red ash is directly discharged; If the differential pressure of the furnace is high, it can only be solved by strengthening the slagging at the bottom of the furnace. This kind of slagging in the furnace has a large amount of unburned coal to be discharged, resulting in energy waste, and the proportion of fine ash is extremely low. Coking generally requires at least four people to put dust manually. Due to the high temperature and large dust in the dusting process, the work is extremely dangerous and it is easy to burn

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