Boiler low grade residual heat combined reclamation method and device

A recovery device, low-grade technology, applied in separation methods, chemical instruments and methods, preheating, etc., can solve the problems of not mentioning the use of recovered steam, the steam contains many impurities, and is easy to cause corrosion, and achieves good social benefits, The effect of reducing pollution and reducing emissions

Inactive Publication Date: 2008-04-23
JIANGSU POLYTECHNIC UNIVERSITY
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Problems solved by technology

The disadvantages of this patent are: 1) Since the steam in the evaporation chamber is directly injected with sewage water, the recovered steam is alkaline an

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  • Boiler low grade residual heat combined reclamation method and device
  • Boiler low grade residual heat combined reclamation method and device

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Embodiment Construction

[0014] As shown in Figure 1, the drainage of the continuous expansion vessel (1) and the hot water after the flash steam in the continuous expansion vessel is used by the heat user (2) are sent to the flash tank (3) to promote its secondary flash evaporation , the flashed steam enters the jet mixing heater (5), and the softened water sent by the softening water pump (4) passes through the nozzle of the jet mixing heater (5), and the flow rate increases and the pressure decreases, which will generate suction for the steam Function, during the mixing process, the steam is condensed and its own temperature is raised to 90°C, and it enters the degassing water storage tank (6) driven by the residual speed of the injection. The temperature of the flash-evaporated wastewater in the flash tank (3) is lowered and discharged into the ditch. A solenoid valve (12) is installed in the sewage pipeline, and the opening of the solenoid valve is controlled by the liquid level control system to ...

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Abstract

This invention relates to a waste heat combined recovery method of power station boiler and its device composition. It mainly recovers the sewage of boiler, the waste heat and cleaning water of the discharged gas from high pressure deaerator. The device includes flash tank, jet type mixed heater, degas water storage tank, frequency converting pump, softening water pump, pipeline and valve. Softened water is used as working medium. It condenses the flash steam and discharged gas from high pressure deaerator through jet type mixed heater. In the degas water storage tank, the air in the discharged gas from high pressure deaerator is removed. The heat water in the water storage tank is transported into the low pressure deaerator through frequency converting pump. Thus, it fulfills the self-using of recovered heat. This invention only brings in softened water from outside and does not change the original thermal system.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization, in particular to a heat recovery method and device for combined recovery of boiler continuous sewage discharge and deaerator exhaust steam waste heat. Background technique [0002] During the operation of the boiler, it is necessary to ensure the water quality of the boiler through continuous and regular blowdown to ensure the safe, stable and economical operation of the boiler. At the same time, the oxygen in the boiler feed water must be removed to avoid corrosion of the boiler pipes. The deaerator is the preferred deaeration technology for power plant boilers. While the deaerator discharges the degassed air into the environment, it also enters the atmosphere with a large amount of working steam. Since boiler continuous sewage and deaerator exhaust steam contain a lot of heat and excellent water quality, if they are directly discharged, it will cause a lot of energy and water res...

Claims

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Application Information

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IPC IPC(8): F22D1/34F22D1/50
Inventor 肖立川陈辉
Owner JIANGSU POLYTECHNIC UNIVERSITY
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