JPH0113210Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a partition plate for starting a fluidized bed combustion furnace, and more particularly to a partition plate for use in a starting cell of a fluidized bed furnace.

When starting a fluidized bed, a fluidized medium in an amount corresponding to the rated load is introduced into the furnace in advance, and fluidizing air (combustion air) is introduced from the bottom of the furnace to fluidize the inside of the bed. At the same time, a method is adopted in which the layer temperature is raised using a starting burner. Specifically, a startup fuel such as heavy oil is used to raise the bed temperature, and when the bed temperature reaches the ignition temperature of the main fuel, such as pulverized coal, the main fuel is gradually switched to, and finally only the main fuel is used. Shift to steady operation. However, this method has the following problems.

First, the amount of fluidized medium corresponding to the rated load is considerable, and even if starting combustion is performed using air (usually cold air equivalent to room temperature) to fluidize this fluidized medium, it is easy to do because the amount of media is large. The bed temperature does not rise and a large amount of startup fuel is required. Heavy oil, natural gas, and other fuels with good ignitability are used as startup fuel, but all of these fuels are expensive, and an increase in startup fuel consumption has a large impact on the operating costs of the fluidized bed reactor. This will affect the

Next, in order to effectively utilize the heat within the fluidized bed, heat transfer tubes such as evaporator tubes and superheater tubes may be placed within the bed, but a certain amount of time is required for the feed water to be heated and steam to be produced. Therefore, even if the temperature in the layer rises, it is impossible to supply steam to the superheater tubes etc. until a certain period of time has elapsed, and there is a risk that the superheater tubes will burn out during this period due to no flow of steam.

To prevent this, as shown in Figure 1,
The air chambers under the perforated plate 2 of the fluidized bed furnace 1 are divided into multiple chambers 3A,
3B and 3C, and a dam is provided on the perforated plate 2 to make the fluidized bed into multiple sections 4A, 4B, and 4C. After starting one of the sections 4A as a starting section, the heated fluidized medium is A method is used in which the water is activated by sequentially overflowing to other adjacent compartments 4B and 4C. In the figure, 7 is a fuel supply line, 8 is a fluidizing air supply line, and 11 is a partition plate. In this method, the combustion gas of the starting burner 5 is introduced into the starting section 3A of the air chamber at the time of starting, so that the starting chamber 3A is heated to high temperature and high pressure (for example, 900°C,
Differential pressure is 1000mm to 3000mmHg), while in the adjacent compartment the temperature is relatively low (e.g. 300°C), so the partition plate 6 made of steel plate is deformed and damaged due to thermal stress etc., and the seal in the starting compartment 3A is damaged. It has the disadvantage of being insufficient.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional technology, and to prevent
To provide a partition plate that will not be deformed or damaged due to thermal stress or the like and will not cause gas leakage into adjacent compartments.

The present invention provides a partition plate that partitions a part of the air chamber formed under the perforated plate of a fluidized bed reactor into a starting compartment, and the partition plate is provided vertically under the perforated plate, and its ends are A steel plate fixed to the perforated plate and the furnace body by welding, a plate-shaped heat insulating material welded to the front side of the starting compartment side of the steel plate, and a removable heat-resistant steel plate provided on the front side. A partition plate for starting a fluidized bed combustion furnace is characterized by comprising:

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 2 is a cross-sectional view showing one embodiment of the starting compartment partition plate of the present invention, and FIG. 3 is a plan view seen from the 3A side in FIG. 2. In the figure, this partition plate is
A starting section 3A is formed by partitioning a part of the air chamber formed under the perforated plate of the fluidized bed furnace.
A steel plate (usually made of mild steel) 13 that is vertically provided below the perforated plate 2 and whose ends are fixed to the perforated plate 2 and the furnace body 20 by welded portions 14;
It is mainly composed of a plate-shaped heat insulating material 12 provided in close contact with the front surface of the starting section 3A side, and a removable heat-resistant steel plate 11 further provided on the front surface. The heat-resistant steel plate provided at the forefront consists of a thin heat-resistant stainless steel plate 11A and a reinforcing steel plate 11B provided in the center excluding the edges, and the upper and lower edges of the heat-resistant stainless steel plate 11A are perforated plates. 2
It is slidably held by support members 10 provided on the lower surface of the furnace body 20 and on the furnace body 20, respectively.

In the above configuration, the high-temperature combustion gas generated by the starting burner 5 is introduced into the starting section 3A, and fluidizes the fluidized bed 4A above the perforated plate. At this time, the partition plate 11 is exposed to high-temperature and high-pressure gas, but the partition steel plate 13 that seals the startup compartment 3A from the adjacent compartment 3B is fixed by welding, and its front surface is connected to the heat-resistant stainless steel plate 11A, its reinforcing plate 11B, and Since it is thermally protected by the heat insulating material 12, the starting compartment can be safely and completely sealed without causing deformation or damage to the partitioning steel plate 13 due to thermal stress. Furthermore, since the heat-resistant stainless steel plate 11 provided on the front surface is removably provided, it can be easily replaced if thermal deterioration or damage occurs.

According to the embodiment described above, it is possible to completely seal the high-temperature, high-pressure startup section and prevent gas leakage due to deformation or damage caused by thermal stress or the like.

As described above, according to the present invention, the steel plate that partitions the starting compartment is thermally protected by the heat insulating material and the removable heat-resistant steel plate sequentially provided on the front side of the starting compartment. The startup compartment can be safely and completely sealed to prevent gas leakage without causing deformation or damage due to thermal stress. Furthermore, the removable heat-resistant steel plate provided at the front can be easily replaced in the event of thermal deterioration or damage, thereby improving the durability of the device.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the fluidized bed section of a fluidized bed combustion furnace;
FIG. 2 is a sectional view of a starting compartment partition plate showing an embodiment of the present invention, and FIG. 3 is a plan view thereof. DESCRIPTION OF SYMBOLS 1...Fluidized bed furnace, 2...Perforated plate, 3A...Start-up compartment, 4A...Start-up compartment fluidized bed furnace, 5...Start-up burner, 10...Support part, 11...Start-up compartment partition Plate, 11A...Heat-resistant stainless steel plate, 1
2...Plate heat insulating material, 13...Partitioning steel plate, 14...
...welding part, 20...furnace body.

Claims (1)

[Scope of utility model registration request] In a partition plate that partitions a part of the air chamber formed under the perforated plate of a fluidized bed furnace to serve as a starting compartment, the partition plate is provided vertically under the perforated plate, and its ends are welded. A steel plate fixed to a perforated plate and a furnace main body, a plate-shaped heat insulating material provided closely to the front side of the starting compartment side of the steel plate, and a removable heat-resistant steel plate provided in front of the steel plate. A partition plate for starting a fluidized bed combustion furnace, characterized by: