Method for heating inlet water of boiler deaerator

A heating method and deaerator technology, which is applied in the field of boilers, can solve the problems of poor deoxygenation effect of boilers of small steam turbine units and affect the power of steam turbines, etc., and achieve the effects of reducing steam extraction of steam turbines, improving economic benefits, and improving economic efficiency

Inactive Publication Date: 2020-08-14
JINAN DANENG POWER TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a heating method for the inlet water of the boiler deaerator. By using various waste heat resources instead of the steam extraction of the steam turbine, the water inlet of the deaerator is heated to the saturation temperature, so as to solve the problem of poor deoxygenation effect of the boiler of the small steam turbine unit. Steam Turbine Power and Power Plant Economics

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  • Method for heating inlet water of boiler deaerator
  • Method for heating inlet water of boiler deaerator
  • Method for heating inlet water of boiler deaerator

Examples

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Embodiment 1

[0046] refer to figure 1 , a back-pressure turbogenerator set based on boiler sewage composite heating boiler deaerator inlet water heating system, mainly including the boiler body, boiler sewage waste heat supplementary heat heater and heat pipe boiler flue gas waste heat heat exchange device. The steam volume of the boiler is 480t / h, the temperature of the boiler sewage is generally about 150°C, the pressure is about 0.5MPa, and the size of the heat exchanger is 900mm×2200mm. The size of boiler flue gas waste heat heat exchanger is 4000mm×5000mm×3200mm, and the heat exchanger is installed in the vertical flue behind the dust collector.

Embodiment 2

[0048] refer to figure 2 The invention discloses a boiler deaerator inlet water heating system based on steam heating and supplementary heat of a back pressure turbogenerator set, which mainly includes a low-pressure steam source, a low-pressure steam supplementary heat heater and a boiler flue gas waste heat exchanger. The steam capacity of the boiler is 240t / h, and the steam waste heat supplementary heater is a shell-and-tube heat exchanger with a steam temperature of about 150°C. The size of the heat exchanger is 450mm×2250mm, and it is installed on a 12m platform in the steam turbine workshop. The boiler flue gas waste heat exchanger is installed in the tail flue of the outlet of the dust collector, and the installation size is 3600mm×4500mm×3500mm.

Embodiment 3

[0050] refer to image 3 , a back pressure turbogenerator set based on waste water recirculation boiler deaerator inlet water heating system, mainly includes: recirculation regulating valve group, pipeline booster pump group and boiler flue gas waste heat exchanger. The recirculation regulating valve group is the key to improving the wall temperature and maintaining the system. A recirculation loop is added, and the recirculation regulating valve group divides part of the water from the B-way water flowing out of the boiler flue gas waste heat heat exchanger as the C-way water. , and then the recirculation regulating valve group returns the C-way water into the boiler flue gas waste heat heat exchanger to complete the recirculation of waste water, and can adjust the recirculation water volume to adjust the wall temperature. In order to improve the heat exchange tube wall temperature in the flue and maintain the system, the recirculation regulating valve group is composed of on...

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Abstract

The invention discloses a method for heating inlet water of a boiler deaerator. The method for heating the inlet water of the boiler deaerator comprises the steps of dividing water entering the deaerator into A-path water and B-path water, heating the A-path water by utilizing a regenerative system, heating the B-path water by utilizing waste heat of a boiler, and merging the A-path water heated by the regenerative system with the B-path water heated by the waste heat of the boiler to enter the deaerator. Therefore, the inlet water temperature of the deaerator is improved, and reaches or is close to the saturated temperature under the working pressure of the deaerator, the deaeration effect of the deaerator is improved, the waste heat of flue gas is utilized, the steam extraction quantityof a steam turbine is reduced, the whole plant economy is improved, and the reliability of a boiler flue gas waste heat exchanger can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a method for heating water entering a boiler deaerator. Background technique [0002] The deaerator is widely used in boiler equipment, and its main purpose is to remove oxygen entering the boiler water and prevent oxygen corrosion in the heating surface of the boiler. The working principle of the deaerator is: using an external heat source to heat the water entering the deaerator to the saturation temperature, the partial pressure of water vapor increases, and the partial pressure of oxygen decreases, so that oxygen escapes from the water. The closer the water entering the deaerator is to saturation, the better the deaeration effect. Therefore, the water entering the deaerator should be heated to the saturation temperature corresponding to the working pressure of the deaerator as much as possible. [0003] The heat source for heating the water entering the deaerato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/50F22D1/00F22B37/54
CPCF22B37/54F22D1/003F22D1/50
Inventor 孙奉仲张良
Owner JINAN DANENG POWER TECH
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