CN204830003U - Firepower power plant uses air heater - Google Patents

Abstract

The utility model belongs to the technical field of air preheaters and discloses an air preheater for thermal power plants. Its technical solution includes a cylindrical shell, a sub-bin fixed in it driven by the rotor to rotate for fixing the heat exchange element, and a fan-shaped plate fixed on the cylindrical shell; the fan-shaped plate corresponds to the sub-bin A brush mechanism with high temperature resistance is provided on the lower side of the machine. The air preheater can minimize the gap between the sub-compartment plate and the fan-shaped plate, thereby reducing the air leakage rate; it also has the characteristics of long life and convenient installation and maintenance.

Description

Air preheater for thermal power plant

technical field

The utility model belongs to the technical field of air preheaters and relates to an air preheater for thermal power plants.

Background technique

The air preheater is an essential equipment for thermal power plants to recover waste heat. Among them, the rotary air preheater is the main selection for large power plants. Because in the rotary air preheater, the heat conversion between the air side and the flue gas side relies on the rotor to drive the heat exchange element to rotate on the air side and the flue gas side to realize the conversion. There is a contact gap at the fan-shaped plate, so air leakage is inevitably caused, so that the heat conversion efficiency of the air preheater is reduced. Reducing air leakage is an important measure for power plants to save energy and reduce consumption. If the air leakage rate of a 600MW thermal power plant unit is reduced by 1%, the coal consumption can be saved by 0.2g/kwh, and tens of thousands of tons of coal can be saved annually. For this reason, power plants have done a lot of work on how to reduce air leakage. Many related technologies have also been born. For example, technologies such as setting flexible sealing parts on the sub-compartment board, automatic tracking and multi-compartment transformation, but these improvements all have problems such as the flexible sealing part of the sub-compartment board is prone to dust blocking failure, the design of automatic tracking is costly and cannot solve the problem of air leakage, and multi-compartment The modification of the cabin will greatly reduce various defects such as heat exchange efficiency.

Utility model content

The purpose of the utility model is to provide an air preheater for a thermal power plant that can minimize the gap between the compartment plate and the sector plate, thereby reducing the air leakage rate and having a long service life.

The technical scheme that realizes above-mentioned utility model purpose is:

An air preheater for a thermal power plant, comprising a cylindrical shell, a sub-bin fixed in it driven by a rotor to rotate for fixing heat exchange elements, and a fan-shaped plate fixed on the cylindrical shell; it is characterized in that: A brush mechanism with high temperature resistance is provided on the lower side of the fan-shaped plate corresponding to the compartment.

In the structure constituting the above-mentioned air preheater for a thermal power plant,

——Sealing sheets are arranged on the sub-compartment plates constituting the sub-compartments;

——A brush sealing sheet is arranged on the sub-compartment plate constituting the sub-compartment.

Compared with the prior art, the air preheater provided by the utility model has the following advantages: firstly, since the lower side of the fan-shaped plate corresponding to the compartment constituting the air preheater is provided with a high temperature resistant The brush mechanism makes the sub-compartment plate directly inserted into the brush mechanism, which can realize the sealed contact between the two, and the gap is almost zero, which can effectively avoid the occurrence of air leakage; There is a bristle-type sealing sheet on the sub-compartment board, which makes the sealing effect between the two better.

Description of drawings

Fig. 1 is the structural representation of the air preheater that the utility model provides;

Fig. 2 is a structural schematic diagram of the fan-shaped plate and the compartment plate.

Detailed ways

The structure and operating principle of an air preheater provided by the utility model will be further described in detail below in conjunction with the accompanying drawings:

The structure of the air preheater is shown in Figures 1 and 2. It consists of a cylindrical shell 1, a compartment 4 fixed in it that is driven by the rotor 2 to rotate for fixing the heat exchange element 3, and fixed in the cylinder. The fan-shaped plate 5 on the housing; a brush 6 with high temperature resistance is provided on the lower side of the fan-shaped plate corresponding to the compartment, and a sealing sheet 8 is provided on the compartment plate 9 constituting the compartment. When the rotor 2 drives the sub-chamber 4 and the heat exchange element 3 to rotate, the sub-chamber plate and its sealing sheet are directly inserted into the metal brush 6 of the fan-shaped plate, so that there is zero gap between the sub-chamber plate and its sealing sheet and the fan-shaped plate, thus The occurrence of air leakage phenomenon in the contact seam between the two is avoided. In addition, because the bristles of the high-temperature-resistant brush that realizes sealing contact are placed upside down on the lower side of the fan-shaped plate 5, it can effectively prevent the intrusion of dust on the flue gas side, resulting in the occurrence of its sealing failure. Therefore, the sealing mechanism of this structure has the advantages of using Long life characteristics.

In the air preheater with the above structure, brush sealing sheets 7 are provided on the compartment plates constituting the compartments, which further improve the sealing effect between the compartment plates and the fan-shaped plates.

Claims (3)

1. An air preheater for a thermal power plant, comprising a cylindrical shell, a compartment fixed therein driven by a rotor to rotate for fixing heat exchange elements, and a fan-shaped plate fixed on the cylindrical shell; its characteristics That is: a brush mechanism with high temperature resistance is provided on the lower side of the fan-shaped plate corresponding to the compartment. 2. An air preheater for a thermal power plant as claimed in claim 1, characterized in that: a sealing sheet is provided on a sub-compartment plate constituting the sub-compartment. 3. An air preheater for a thermal power plant as claimed in claim 1, characterized in that: a brush sealing sheet is arranged on the sub-compartment plate constituting the sub-compartment.