CN201496988U - Heat expansion device of air preheater - Google Patents

Abstract

The utility model relates to a thermal expansion device, in particular to a thermal expansion device in an air preheater for preheating the air entering the garbage incinerator, which is arranged outside the wall of the preheater box, and the thermal expansion device has two upper and lower pieces An elastic U-shaped plate, each side of the U-shaped plate is fixedly connected with a sealing plate, and the heat exchange tubes arranged in the preheater pass through the sealing plate and protrude out of the box. The unique thermal expansion device of the utility model can effectively reduce the influence of the thermal expansion of the heat exchange tube on the preheater, and greatly increase the service life of the preheater.

Description

A thermal expansion device for an air preheater

technical field

The utility model relates to a thermal expansion device, in particular to a preheater thermal expansion device used for preheating the air entering the garbage incinerator.

Background technique

In the process of waste incineration, in order to make the low-calorific value waste burn better and ensure that the combustion air entering the furnace of the waste incinerator is kept at a stable temperature, the combustion air must be heated by the air preheater before it can be sent into the incinerator.

The current air preheating method uses the waste heat of flue gas, which contains water vapor and sulfuric acid vapor, and the working conditions are relatively harsh, and low-temperature corrosion and ash blockage are prone to occur. Once low-temperature corrosion and ash blockage occur, the flue gas channel will be blocked, the resistance of the induced draft will increase, and the boiler will burn under positive pressure, which will not only reduce the output of the boiler, but even cause the forced shutdown of the boiler. As a result of corrosion, the air preheater tubes will be leaked and damaged, resulting in serious air leakage and deterioration of combustion conditions. In serious cases, the heating surface has to be replaced frequently, which not only increases the maintenance workload and material loss, but also affects the normal operation of the boiler. When cold air enters the flue gas side, it will also reduce the temperature of the flue gas, accelerate the speed of low-temperature corrosion and ash blocking, thus affecting the safe operation of the boiler, greatly reducing the service life of the equipment, and the leakage of flue gas will also cause environmental pollution. The above problems can be solved by steam preheating, but the existing steam preheater adopts serpentine tube heat exchange tubes, and the tubes will expand when heated, which affects the service life of the preheater.

Utility model content

The technical problem to be solved by the utility model is to provide a thermal expansion device for an air preheater to solve the technical problem of short service life of the original preheater.

The technical scheme adopted by the utility model to solve the technical problem is: a thermal expansion device of the air preheater, which is arranged outside the wall of the preheater box, and the thermal expansion device has two elastic U-shaped plates on the upper and lower sides, and the U-shaped plate A sealing plate is fixedly connected to each side, and the heat exchange tube arranged in the preheater passes through the sealing plate and protrudes out of the box.

The beneficial effects of the utility model: the unique thermal expansion device can effectively reduce the influence of the thermal expansion of the heat exchange tube on the preheater, and greatly increase the service life of the preheater.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the front view structural representation of the utility model;

Among them: 1. box body, 2. U-shaped plate, 3. sealing plate, 4. heat exchange tube.

Detailed ways

Now in conjunction with accompanying drawing and preferred embodiment the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1, a thermal expansion device for an air preheater is arranged on the outside of the preheater box wall. The thermal expansion device has two elastic U-shaped plates on the upper and lower sides, and a sealing plate is fixedly connected to each side of the U-shaped plate. , the heat exchange tubes set in the preheater pass through the sealing plate and protrude out of the box.

When in use, the air enters the preheater from the air inlet, and is quickly and evenly distributed through the deflector. The air is heated by the steam in the heat exchange tube and then sent out to the air outlet.

The unique thermal expansion device of the utility model can effectively reduce the influence of the thermal expansion of the heat exchange tube on the preheater, and greatly increase the service life of the preheater.

Claims (1)

1. A thermal expansion device for an air preheater, which is arranged outside the wall of the preheater casing (1), is characterized in that: the thermal expansion device has two elastic U-shaped plates (2) up and down, and the U-shaped plate (2) ) is fixedly connected with a sealing plate (3) on both sides, and the heat exchange tube (4) arranged in the preheater passes through the sealing plate (3) and protrudes outside the box body (1).

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