Low-pressure coal saver for boiler

A low-pressure economizer and economizer tube technology, applied in indirect carbon dioxide emission reduction, combustion methods, lighting and heating equipment, etc., can solve the problem of increasing the heating surface of the high-pressure economizer, increasing the high-pressure Large air preheater and other problems, to avoid low temperature corrosion and ash blocking, high waste heat recovery effect, and improve reliability.

Inactive Publication Date: 2007-02-28
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

This seriously affects the boiler efficiency and the cycle efficiency of the power plant, and increases the coal consumption of the boiler
At present, there are many ways to solve the problem of rising exhaust gas temperature. Measures such as increasing the heating surface of the high-pressure economizer and increasing the heating surface of the air preheater can be adopted. However, these measures are often restricted by technology or structure.
Enlarging the heating surface of the high-pressure economizer will inevitably lead to an increase in the outlet water temperature. The limit value is the saturation temperature in the boiler drum, and it is also limited by the installation space.
Enlarging the heating area of ​​the air preheater will inevitably lead to an increase in the temperature of the hot air, which is also limited by the installation space and the temperature resistance of the metal

Method used

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  • Low-pressure coal saver for boiler
  • Low-pressure coal saver for boiler

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Embodiment Construction

[0011] The best embodiment of the present invention is illustrated below in conjunction with accompanying drawing:

[0012] As shown in Figure 1 and Figure 2, the inlet header 2 is connected to the heater of the low-pressure recuperation system through pipelines, the outlet header 3 is connected to the deaerator through pipelines, and the low-pressure economizer is installed at the tail of the outlet of the boiler air preheater on the flue. The heat exchange tube bundles in the economizer tube panel are spiral finned tubes or longitudinally finned tubes. A high-temperature switching valve 4 and a low-temperature switching valve 5 are arranged in the pipeline connecting the inlet header 2 and the low-pressure heater. When the present invention works, the flue gas flowing out from the air preheater enters the outer space of the tube bundle 1 of the low-pressure economizer to flow, and releases heat so that the temperature of the flue gas is lowered. Condensed water is drawn fr...

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Abstract

The invention relates to a left-heat recycle energy-saving device of boiler, wherein the low-pressure coal saver is mounted at the tail smoke channel at the outlet of air preheater, which is formed by tube beam, inlet couple bank, and outlet couple bank; the tube beam uses fin improved tube structure; the surfaces of base tube and fin are modified. The invention uses the condensed water inside the low-pressure recycle heating system to switch between high and low temperatures, while the outlet water is leaded into oxygen remover. The invention can reduce the smoke temperature and improve the cycle heat efficiency, with corrosion resistance.

Description

1. Technical field [0001] The invention belongs to boiler waste heat recovery and energy-saving equipment, in particular to a low-pressure economizer capable of reducing the exhaust gas temperature of various power station boilers. 2. Background technology [0002] During the operation of many boilers, due to various reasons such as changes in the type of coal burned, changes in load, changes in combustion methods, and changes in the heating surface, etc., the deviation from the design condition is caused, and the exhaust gas temperature deviates from the design value and increases by about 20-50 °C. This seriously affects the boiler efficiency and the cycle efficiency of the power plant, and increases the coal consumption of the boiler. At present, there are many ways to solve the problem of rising exhaust gas temperature. Measures such as increasing the heating surface of the high-pressure economizer and increasing the heating surface of the air preheater can be adopted. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00F23J15/00
CPCY02E20/34
Inventor 孙奉仲黄新元史月涛王乃华
Owner SHANDONG UNIV
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