System and method for recycling heat energy generated by deslagging of fluidized-bed combustion boiler
A fluidized bed boiler, thermal energy technology, applied in the combustion method, indirect carbon dioxide emission reduction, preheating and other directions, can solve the problem that the effective recycling rate of thermal energy is not very high, the temperature of the slag cooler outlet is difficult to control, and the slag cooling effect is not very good. It can achieve the effect of improving the overall thermal efficiency, easy project implementation and simple structure
Inactive Publication Date: 2014-09-03
BEIJING JIAOTONG UNIV
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Problems solved by technology
In the actual operation process, due to the mismatch between boiler feed water and slag discharge volume, it is difficult to control the outlet water temperature of the slag cooler, resulting in poor slag cooling effect, and the effective recovery rate of heat energy is not very high
Method used
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Embodiment 2
[0034] The difference between embodiment 2 and embodiment 1 is that in figure 2 Among them, a multi-stage steam turbine extraction heat recovery device 11 is provided in front of the deaerator, and the outlet water of the slag cooler can be connected to the water inlet pipe of the deaerator 12, or can be connected to the water inlet pipe before the deaerator 12. In the water inlet pipe of a certain level of low heating and heating system.
[0035] When the outlet water of the slag cooler is connected to the water inlet pipe of the deaerator 12, in order to prevent the outlet water temperature of the slag cooler from being too low and affect the deaerator effect of the deaerator, the outlet water temperature of the slag cooler should be higher than that of the access point The local saturation temperature is 2-20°C lower and not lower than the inlet water temperature of the deaerator. Preferably, in this embodiment, the outlet water temperature of the slag cooler is controlle...
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The invention discloses a system for recycling heat energy generated by deslagging of a fluidized-bed combustion boiler. The system comprises a slag cooler, a turbine condenser, a deaerator, at least one stage of turbine steam extraction heat return device and an air preheater, wherein heat sources of the air preheater, the deaerator and the at least one stage of turbine steam extraction heat return device come from low-pressure steam extraction of the turbine; the multiple stages of turbine steam extraction heat return devices are sequentially connected through a pipe; a first condensed water outlet of the turbine condenser is connected with a cooling water inlet of the slag cooler through a pipe; a cooling water outlet of the slag cooler is connected with a water outlet pipe of one of the multiple stages of turbine steam extraction heat return devices through a pipe; a second condensed water outlet of the turbine condenser is connected with a water inlet of the first stage of turbine steam extraction heat return device through a pipe; and a water outlet of the last stage of turbine steam extraction heat return device is connected with a water inlet of the deaerator through a pipe.
Description
technical field [0001] The invention relates to the technical field of fluidized bed boilers, in particular to a system and method for recycling heat energy from slag discharge of fluidized bed boilers. Background technique [0002] Coal gangue is one of the industrial solid wastes with the largest emissions at present, and has the characteristics of low volatile matter, high ash content, low calorific value and difficult to burn. Coal gangue is the carbonaceous rock discharged from coal mines during the construction of wells, development and excavation, coal mining and coal washing, and is the associated waste in the process of coal mine construction and production. Coal gangue generally accounts for 15% to 20% of raw coal production. At present, the total accumulation in my country has reached 4 billion tons. [0003] Fluidized bed combustion technology is a new type of combustion technology gradually developed in the past two decades. It has good combustion adaptability...
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IPC IPC(8): F22D1/36F23L15/00
CPCY02E20/34
Inventor 周岩梅张琼许兆义刘伟富姚晓飞
Owner BEIJING JIAOTONG UNIV