Device for preventing low-temperature corrosion of economizer heating surface
A low-temperature corrosion and economizer technology, applied in preheating, feed water heaters, lighting and heating equipment, etc., can solve problems such as increased low-temperature corrosion speed, economic loss of power plants, frequent pipe bursts, etc., to prevent low-temperature corrosion, Effect of increasing metal wall temperature and easy operation
Active Publication Date: 2014-04-16
自贡华西能源工业有限公司
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[0002] At present, biomass direct-fired boilers have been applied and promoted in China. However, due to insufficient supply of biomass fuel and other reasons, the boiler cannot work at full load under B-MCR all the year round, which prevents the steam turbine from working at full load, and consequently causes boiler feed water The temperature is lower than the design value all the year round (generally not lower than 150°C), and once the metal wall temperature is lower than 150°C, the low-temperature corrosion rate will increase geometrically, which will cause aggravated corrosion of the economizer, frequent tube bursts, and continuous boiler The running time is greatly shortened, causing losses to the economics of the power plant
At present, in domestic boiler technology, there is no good way to protect the economizer from low-temperature corrosion. It is very common to encounter such a situation. Under such working conditions, the economizer can only passively accept low-temperature corrosion
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[0026] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0027]Any feature disclosed in this specification (including any appended claims, abstract), unless otherwise stated, may be replaced by alternative features that are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0028] The device for preventing low-temperature corrosion of the heating surface of the economizer of the present invention is different from conventional coal-fired boilers that often encounter sulfur corrosion. The corrosion of biomass boilers mainly comes from elemental chlorine, see Figure 4 , metal surface (pipe wall) temperature (°C).
[0029] It can be seen from the figure that in the low temperature section below 150 °C, electrochemical corrosion is mainly ...
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The invention discloses a device for preventing low-temperature corrosion of an economizer heating surface, and belongs to the technical field of boilers. The device comprises an economizer system pipeline, a boiler barrel and a mixer. A heat exchanger is arranged on the steam side in the boiler barrel, and a water inlet of the heat exchanger is connected with a heat exchanger water inlet pipe which is connected to a water supply control board. A water outlet of the heat exchanger is connected with a heat exchanger water return pipe which is connected to the mixer. The mixer is further connected with a water inlet pipe which is connected to the water supply control board. An outlet of the mixer is connected to an economizer inlet header of an economizer, and an economizer outlet header of the economizer is connected into the boiler barrel through a boiler barrel water supply pipe. The device enables the temperature of the metal wall at the inlet end of the economizer to be higher than 150 DEG C, so that low-temperature corrosion to the thinnest inlet end of the economizer is avoided, the temperature of the metal wall of the economizer is improved, and the phenomenon of low-temperature corrosion of the economizer heating surface can be prevented on the entire economizer.
Description
technical field [0001] The invention relates to the technical field of biomass direct-fired boilers, in particular to a technology for preventing low-temperature corrosion of a heating surface of an economizer. Background technique [0002] At present, biomass direct-fired boilers have been applied and promoted in China. However, due to insufficient supply of biomass fuel and other reasons, the boiler cannot work at full load under B-MCR all the year round, which prevents the steam turbine from working at full load, and consequently causes boiler feed water The temperature is lower than the design value all the year round (generally not lower than 150°C), and once the metal wall temperature is lower than 150°C, the low-temperature corrosion rate will increase geometrically, which will cause aggravated corrosion of the economizer, frequent tube bursts, and continuous boiler The running time is greatly shortened, causing losses to the economy of the power plant. At present, i...
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Login to View More IPC IPC(8): F22B37/02F22D1/00
Inventor 蔡文钢邱竑翔
Owner 自贡华西能源工业有限公司