CN111271718A - A device and method for blowing soot by using flue gas in a low-low temperature economizer - Google Patents

Abstract

The invention relates to a device and a method for blowing soot by using flue gas of a low-temperature economizer, which mainly comprise the low-temperature economizer (or the low-temperature economizer), a low-temperature economizer inlet flue, a low-temperature economizer outlet flue, an electrostatic precipitator outlet flue, a soot blowing fan inlet baffle door, a soot blowing fan outlet baffle door, an air distribution pipe and a fluidization plate. The invention relates to the field of low-temperature electric dust removal and flue gas waste heat recovery of boilers in thermal power plants, and is suitable for the application field of arranging low-temperature economizers and low-temperature economizers in a horizontal flue in a high-ash environment. The invention has low operation cost and convenient maintenance and repair.

Description

A device and method for blowing soot by using flue gas in a low-low temperature economizer

technical field

The invention relates to the field of low-low temperature electrostatic precipitator and flue gas waste heat recovery of boilers in thermal power plants, and is suitable for the application field of arranging low-low temperature economizers and low-temperature economizers in a horizontal flue in a high-ash environment.

Background technique

Low and low temperature electrostatic precipitator technology is a new type of dust removal technology that is widely used in China. Under certain conditions, it can reduce the specific resistance and improve the dust removal efficiency of electrostatic precipitators. The low and low temperature economizer usually adopts water-mediated heat exchange, and the metal heat exchange tube is arranged in the flue in front of the electrostatic precipitator, and the indirect heat exchange between water and flue gas is used to reduce the temperature of flue gas and the specific resistance of dust, thereby increasing the The dust removal efficiency of the electrostatic precipitator, the heated water can be returned to the boiler feed water or hot network water for waste heat recovery.

Since the low and low temperature economizer is usually arranged in the horizontal flue of the electrostatic precipitator, the ash accumulation site is inevitable. The current low and low temperature economizer usually adopts a sonic sootblower or a fixed rotary steam sootblower, but these two This method has a certain effect on removing the ash deposits on the tube bundles of the low-low temperature economizer, but cannot effectively remove the ash deposits at the bottom of the low-low temperature economizer.

The present invention intends to develop a method for cleaning the ash deposited at the bottom of the low and low temperature economizer.

SUMMARY OF THE INVENTION

In order to effectively remove the ash deposits at the bottom of the low and low temperature economizer. The technical scheme of the present invention is realized in the following manner:

A device and method for low-low temperature economizer using flue gas soot blowing, characterized in that it comprises a low-low temperature economizer (or low-temperature economizer), a low-low temperature economizer inlet flue, a low-low temperature economizer, and a low-low temperature economizer. Coaler outlet flue, electrostatic precipitator, electrostatic precipitator outlet flue, soot blowing flue, soot blower, soot blower inlet baffle door, soot blower outlet baffle door, air distribution pipe, fluidization plate.

When the low and low temperature economizer is put into operation, the clean flue gas after dedusting is extracted from the outlet flue of the electrostatic precipitator, and after being pressurized by the fan, it is connected to the air distribution pipe of the bottom shell of the low and low temperature economizer, and the air is passed into the flow The ash at the bottom is fluidized and taken away by the flue gas.

The outlet flue of the low and low temperature economizer is connected to the electrostatic precipitator; the outlet flue of the electrostatic precipitator is arranged at the outlet of the electrostatic precipitator; the soot blowing flue is connected to the bottom shell of the low and low temperature economizer and the electrostatic precipitator The soot blower outlet flue; the soot blower inlet baffle door, the soot blower, the fan outlet baffle door, the air distribution pipe, and the fluidization plate are sequentially arranged on the soot blower flue; the fluidization plate is a hemispherical structure, It is evenly arranged at the bottom of the low and low temperature economizer shell; the air distribution pipe is horizontally connected to the fluidization plate.

The low and low temperature economizer (low temperature economizer) heat exchange tube adopts the type of plain tube, spiral fin, H-shaped fin or double H-shaped fin, and the heat exchange tube is made of 20 steel, ND steel, stainless steel tube, etc. .

The invention will be further described below with reference to the accompanying drawings and specific embodiments.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is the process flow schematic diagram of the patent of the present invention.

In the picture: 1. Low and low temperature economizer, 2. Low and low temperature economizer inlet flue, 3. Low and low temperature economizer outlet flue, 4. Electrostatic precipitator, 5. Electrostatic precipitator outlet flue, 6. Soot blowing flue, 7. Soot blower, 8. Soot blower inlet baffle door, 9. Soot blower outlet baffle door, 10. Air distribution duct, 11. Fluidization plate.

Detailed ways

1, a device and method for low-low temperature economizer utilizing flue gas soot blowing is characterized in that it comprises a low-low temperature economizer (or low-temperature economizer) (1), a low-low temperature economizer Inlet flue (2), low and low temperature economizer outlet flue (3), electrostatic precipitator (4), electrostatic precipitator outlet flue (5), soot blowing flue (6), soot blower (7) , soot blower inlet baffle door (8), soot blower outlet baffle door (9), air distribution pipe (10), fluidization plate (11).

The outlet flue (3) of the low-low temperature economizer is connected with the electrostatic precipitator (4); the outlet flue (5) of the electrostatic precipitator is arranged at the outlet of the electrostatic precipitator (4); the soot blowing flue ( 6) Connect the bottom shell of the low and low temperature economizer (1) and the outlet flue of the electrostatic precipitator (5); the inlet baffle door (8), the soot blower (7), and the fan outlet baffle door of the soot blower (9) The air distribution pipe (10) and the fluidizing plate (11) are arranged on the soot blowing flue (6) in sequence; the fluidizing plate (11) is of an arc structure and is evenly arranged on the low-low temperature economizer (1) The bottom of the casing; the air distribution pipe (10) is horizontally connected to the fluidization plate (11).

In the system shown in Fig. 1, when the electrostatic precipitator (4) is in normal operation, regardless of whether the low-low temperature economizer (1) is in operation or not, the dust-removed flue gas from the outlet flue (5) of the electrostatic precipitator is extracted into the system. The soot blowing flue (6), after being pressurized by the soot blower (7), blows the flue gas evenly into the fluidized plate (11) through the air distribution pipe (10), and the fluidized plate (11) avoids low and low temperature and saves coal The bottom support of the economizer (1) is evenly arranged on the bottom shell of the low and low temperature economizer (1). It is convenient for the main flue gas to be carried, so as to achieve the purpose of reducing the ash accumulation at the bottom of the low and low temperature economizer (1).

The invention has low operation cost, convenient maintenance and operation and maintenance.

The above are only specific embodiments of the present invention, and the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art in the field of the present invention should be included in the patent scope of the present invention.

Claims (3)

1. A device and method for low-low temperature economizer using flue gas soot blowing, mainly consisting of low-low temperature economizer (or low-temperature economizer), low-low temperature economizer inlet flue, low-low temperature economizer It is composed of outlet flue, electrostatic precipitator, electrostatic precipitator outlet flue, soot blowing flue, soot blower, soot blower inlet baffle door, soot blower outlet baffle door, air distribution pipe and fluidization plate. It is characterized in that: the low-low temperature economizer heat exchange tube adopts the type of plain tube, spiral fin, H-shaped fin or double H-shaped fin, and the heat exchange tube is made of 20 steel, ND steel, stainless steel tube, etc. The low and low temperature economizer medium is water, and the shell side medium is flue gas. The low and low temperature economizers include low temperature economizers, low pressure economizers, etc. according to different uses. 2. According to claim 1, the outlet flue of the low-low temperature economizer is connected with the electrostatic precipitator; the outlet flue of the electrostatic precipitator is arranged at the outlet of the electrostatic precipitator; the soot blowing flue is connected to the low-low temperature economizer Bottom shell and electrostatic precipitator outlet flue; the soot blower inlet baffle door, soot blower, fan outlet baffle door, air distribution pipe and fluidization plate are arranged on the soot blower flue in sequence. 3. According to claim 1, the fluidized plate has an arc-shaped structure and is evenly arranged at the bottom of the low-low temperature economizer shell; , block the pipe.

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