The base of the furnace with the formation of the fluidized bed

 

(57) Abstract:

The base or under the furnace with the formation of a boiling or fluidized bed contains a metal support sheet, through which pass the nozzle of the injection of fluidizing the solid layer of hot particles in the gas, is equipped with a special coating of refractory material, and the supporting plate is made of refractory metal, and its floor is formed by many flat protective elements, also made of refractory metal and completely covering the base sheet, each of the flat protective elements attached to the support sheet by means of a weld in some localized area of the dot character. Task: improved resistance to thermal and mechanical erosion, thermal shock and temperature extremes. 6 C.p. f-crystals, 5 Il.

The invention relates to a base or hearth of the furnace, which uses boiling or fluidized bed.

More specifically, the invention relates to the Foundation of the furnace, which is formed by boiling or fluidized bed. This furnace contains a metal support sheet, which passes through the injector nozzle gas supply, creating a fluidized bed, and that SN is Chiyo materials have a strong erosive effect on the refractory lining, given their considerable speed of movement created by the flow siraudeau gas. In addition, because of the significant deviations of temperature between the inner cavity of this furnace and supplied to it fluidizing gas at the outlet of the injector nozzles this zone of the furnace is subjected to significant thermal stresses.

There is a method of protection of the reference sheet of the furnace of this type with a layer of refractory material deposited on the sheet and usually consisting of refractory concrete (US patent 5161471).

Such refractory layer must have a sufficiently large thickness exceeding, for example, 100 mm, This thickness of the protective layer significantly affects the total height of this furnace and the length of the respective feeder siraudeau gas nozzle injectors.

On the other hand, this protective layer of refractory material is subjected to constant wear and tear, which require periodic repair and restore the protective coating. At the level of the base or hearth of this furnace, the concentration of solid fuels is really quite large and ranges from approximately 500 to 1200 kg/m3.in separation of the particles of the material from which the layer is made. These particles are mixed with a fluidized bed of solid particles of combustible material and make a perturbation of the input process of fluidization in the furnace.

The present invention can solve the aforementioned technical problems. For this purpose, in accordance with this invention the above-mentioned base sheet, the base of the furnace is made of refractory metal and the cladding or lining is made from flat metal refractory elements, covering referred to the reference list, and each of the said flat protective elements attached to the support sheet by welding in a localized spot area.

Designed protective coating of the reference sheet is able to withstand thermal and mechanical erosion and thermal shock or sudden temperature changes. Welding mentioned protective elements only in a localized spot areas of opportunity for these flat elements can freely deform under the effect of differential thermal expansion. Thus, the flat refractory protective elements are not exposed to effort, estline of the present invention protective flat elements are located close to each other.

In accordance with the preferred method of the practical implementation of each of the flat protective elements is equipped with a special hole in which welding is carried out with the formation of the weld connecting the element with the supporting sheet, the base of the furnace.

In the most preferred embodiment, the hole is located strictly in the center of this flat protective element.

Flat protective elements may be of a strictly rectangular shape. When this nozzle injectors fluidizing gas can be arranged in one line in two mutually perpendicular directions on this reference sheet. When this nozzle injectors are located at the rounded inside corners of these flat protective elements. In a preferred embodiment of the invention supporting a sheet of Foundation of this furnace and flat protective elements on its surface made of refractory steel.

Below is a more detailed description of the invention, in which reference is given in Appendix figures represent only a preferred method of implementation of this invention. Among presented in Appendix figures:

- FINGO or fluidized bed in accordance with the invention;

- Fig. 2, which schematically presents a top view of the support sheet of the base of the furnace, provided with a protective coating in accordance with the invention;

- Fig. 3, which schematically shows in vertical sectional view on the line III-III shown in Fig. 1;

- Fig. 4, which schematically shows in vertical sectional view on the line IV-IV shown in Fig. 1;

- Fig. 5, which schematically shows in a vertical sectional view of the base of the furnace, provided with a protective coating in accordance with the invention.

In Fig. 1 schematically presents the supporting sheet 1 of metal, situated at the bottom of this furnace. This reference sheet in accordance with the invention made of a refractory metal, preferably of refractory steel, such as Incoloy 800 HT".

This reference sheet 1 is mechanically reinforced by means of reinforcing elements formed by cross-beams, welded intermittent weld seam to the bottom of this reference sheet 1. The reinforcing elements may consist, for example, two cross-beams 2, which are continuous and pass around the scale referred to the reference sheet, and TLD is 3, 3' and 3", which is located on a square grid with the above-mentioned solid crossbars. Over the points of intersection of these reinforcing elements in the support sheet 1 is made of a special hole 4, which provide the possibility of mounting the base of this furnace at the point of construction, as will be described in more detail below.

In this reference sheet 1 made holes 5, intended for the passage of the supply pipe to the nozzles for the injection of gas, creating a fluid bed or fluidized bed, as shown in the diagrams shown in Fig. 2 and 5. These openings 5 are located on the support sheet in straight rows, which are located in two mutually perpendicular directions with the formation of a uniform square grid. In the most preferred embodiment of the present invention, the holes 4 in the base sheet 1 are located at equal distances from the four adjacent holes 5, designed nozzles for the injection of gas 10.

Many flat protective elements 6 made of refractory metal, in the preferred embodiment, refractory steel-type Incoloy 800 HT, and having a thickness of about 15 mm, are arranged closely to each the 6 is attached to this plate by welding in some localized point area. These flat protective elements 6 for the most part have a square shape with sides exactly equal to the distance between adjacent injection nozzles 6, and a flat protective elements 6 of rectangular shape is provided at the edges of the mentioned reference sheet 1.

Each flat protective element 6 provided with a hole 7 located strictly in the center of this flat element 6. In this opening 7 is mounting weld seam 8, preferably welded seam, usually called seam-seal. This welded connection is formed by a welded seam along the edge of the hole 7, connecting the flat protective element 6 and the support sheet 1. Corners flat protective elements 6 are rounded in such a way as to surround the openings 5.

These flat protective elements 6 are welded to the support sheet 1, as shown in Fig. 3, in the factory, in addition to the four elements 6', which should be placed in the locations of the holes 4 in this reference sheet 1 and which is welded to the place where the construction of this furnace, as shown in Fig. 4.

On-site facilities of the furnace immediately welded four flat protective element 6' to the support sheet 1, already rolled the social round flat part 9 is welded in the holes 4 of the reference sheet 1 to the pipe 11, fixed in the supporting structure 12, which serves as the basis for the reference sheet 1 and preventing bending. To implement the above-mentioned operation, the tube 11 has openings for the passage of the reinforcing crossbars 2, 3, 3', 3". These flat round parts 9 are welded via a weld, similar to the welded seam 8 in the hole 7, a flat protective elements 6'.

These flat protective elements 6' are in their corners more extensive excavation in comparison with other flat elements 6. This is done in order to allow insertion through the passage between the heads injection nozzles 10 that are already installed in its place, with a diameter greater than the diameter of the passage 5.

As an example, it can be noted that square flat protective elements 6 can have a side length of about 240 mm and the diameter of the Central hole 7 may be approximately 30 mm

Such arrangement of the elements of the proposed device can be used for any reason the furnace with the formation of a fluidized bed or fluidized bed. This can be, for example, the main base of the furnace, the base with an external fluidized bed associated with the main fire chamber or base with internal what ielem.

1. The base of the furnace with the formation of a fluidized bed containing a metal support sheet 1, through which pass the injection nozzle 10 fluidizing gas, is equipped with a special coating of refractory material, characterized in that the supporting sheet 1 made of refractory metal, and a special coating is formed by many flat protective elements 6, 6' made of refractory metal and covering the base sheet 1, each flat element 6, 6' is attached to the plate 1 by means of a welded seam 8 in a localized area of point type.

2. The base of the furnace under item 1, characterized in that the flat protective elements 6, 6' are located close to each other.

3. The base of the furnace on PP.1 or 2, characterized in that each flat protective element 6, 6' has a hole 7, which is welded seam 8 linking this flat element with a support sheet 1.

4. The base of the furnace under item 3, characterized in that the aperture 7 is located strictly in the center of this flat protective element 6, 6'.

5. The base of the furnace according to any one of paragraphs.1-4, characterized in that the flat protective elements 6, 6' are strictly rectangular shape.

6. The basis toernig directions of the support sheet 1 and are rounded inside corners flat protective elements 6,6'.

7. The base of the furnace according to any one of paragraphs.1-6, characterized in that the support sheet 1 and a flat protective elements 6, 6' made of refractory steel.

 

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