JPH0517305U - Reactor wall structure of fluidized bed boiler - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to maintain the combustion temperature within a specified temperature range. In a fluidized bed boiler in which a fuel is combusted while being fluidized together with a fluidizing medium and a part of the combustion heat is collected by a water pipe wall 7, an abrasion resistant block 8 is provided inside the water pipe wall 7. Is attached, and a heat insulating material 10 is interposed between the abrasion resistant block 8 and the water pipe wall 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a furnace wall structure of a fluidized bed boiler in which fuel is combusted while being combusted with combustion air.

[0002]

[Prior Art]

 A fluidized bed boiler is known as a boiler that efficiently burns solid fuel.

A fluidized bed boiler supplies combustion air into a furnace to burn fuel such as coal and petroleum coke while fluidizing it with a fluidizing medium (a bed material made of combustion ash). Some of the combustion heat is collected by the water pipe wall. The steam generated by this heat collection is supplied to the steam turbine.

[0004]

[Problems to be solved by the device]

 By the way, in the above fluidized bed boiler, since the temperature of the fluidized bed in the furnace, that is, the combustion temperature greatly contributes to the combustion characteristics (combustion efficiency, NOx reduction, desulfurization), it is desirable to maintain the temperature within the optimum range. Especially in a small fluidized bed boiler, the heat transfer surface of the water tube wall is relatively large, and it is difficult to maintain the temperature, and the combustion characteristics may deteriorate.

Therefore, the present invention has been made in consideration of such circumstances, and an object thereof is to provide a furnace wall structure of a fluidized bed boiler capable of maintaining a combustion temperature within a predetermined temperature range. To provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a fluidized bed boiler in which a fuel is combusted while being fluidized together with a fluidizing medium, and a part of the combustion heat is absorbed by the water tube wall. An abrasion resistant block is attached to the inside, and an insulating material is interposed between the abrasion resistant block and the water pipe wall.

[0007]

[Action]

 By installing a wear-resistant block inside the water pipe wall, wear of the water pipe wall due to fluidization of fluidizing media etc. is prevented and the water pipe wall is protected, and the wear-resistant block and water pipe Since the heat insulating material is interposed between the wall and the wall, heat transfer from the fluidized bed formed by fluidization to the wall of the water pipe is reduced, so that the combustion temperature can be maintained within a predetermined temperature range.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 4, reference numeral 1 denotes a furnace of a fluidized bed boiler 2, an air dispersion plate 3 is provided below the inside thereof, and a fuel such as coal or petroleum coke and a fluidizing medium are provided on the air dispersion plate 3. (Bed material composed of combustion ash, limestone, etc.). A combustion air line 5 is connected to the wind box 4 below the air distribution plate 3, and the combustion air from the line 5 fluidizes the fuel and the bed material on the air distribution plate 3 to form a fluidized bed. 6 is formed and the fuel is burned.

The furnace wall of the furnace 1 is formed of a water tube wall 7 so as to absorb a part of combustion heat. Inside the water tube wall 7 inside the furnace 1, from the air dispersion plate 3 to a position higher than the fluidized bed 6, a plurality of abrasion resistant blocks 8 as shown in FIG. 2 are attached with bolts 9 as shown in FIG. It is attached. That is, the wear resistant block 8 is attached to the inside of the furnace 1 of the water tube wall 7 on which the fluidized bed 6 is formed. When these wear resistant blocks 8 are attached to the water pipe wall 7, a clearance 11 is provided on the contact surface of the wear resistant block 8 so that the heat insulating material 10 can enter. As shown in FIGS. 3A and 3B, a plurality of horizontal fins 12 or studs 13 are provided on the wall surface for forming the clearance 11 at appropriate intervals in the height direction thereof. The heat insulating material 10 put in the clearance 11 is held by the horizontal fins 12 or the studs 13.

Next, the operation of this embodiment will be described.

As shown in FIG. 1, an abrasion resistant block 8 containing a heat insulating material 10 is attached inside the water pipe wall 1. Then, as shown in FIG. 4, combustion air is supplied from a combustion air line 5 into the wind box 4 of the furnace 1. Then, the fuel on the air dispersion plate 3 is fluidized by the combustion air together with the bed material to form the fluidized bed 6, and the fuel burns. Part of this combustion heat is collected by the water pipe wall 7.

As shown in FIGS. 1 and 4, an abrasion resistant block 8 is attached to the inside of the water pipe wall 7 on which the fluidized bed 6 is formed, so that the fluidizing medium or the like may flow. The water pipe wall 7 is prevented from being worn and the water pipe wall 8 is protected. Since the heat insulating material 10 is interposed between the clearance 11 of the wear resistant block 8, that is, between the wear resistant block 8 and the water pipe wall 7, heat transfer from the fluidized bed 6 to the water pipe wall 7 is prevented. Decrease. Therefore, the temperature of the fluidized bed in the furnace 1 can be maintained within a predetermined range, and deterioration of combustion characteristics can be prevented. Further, since the horizontal fins 12 or the studs 13 are provided on the clearance 11 forming wall surface of the wear resistant block 8, the heat insulating material 10 put in the clearances 11 is held, so that the temperature of the fluidized bed in the furnace 1 is increased. It will surely be maintained.

Therefore, since the abrasion resistant block 8 is attached to the inside of the water tube wall 7 in the furnace 1, and the heat insulating material 10 is interposed between the abrasion resistant block 8 and the water tube wall 7, fluidization is achieved. The water tube wall 7 can be protected from fluidization of the medium and the like, and the temperature of the fluidized bed in the furnace 1 can be maintained within a predetermined temperature range.

[0015]

[Effect of the device]

 In summary, according to the present invention, since the wear resistant block is attached to the inside of the water pipe wall and the heat insulating material is interposed between the wear resistant block and the water pipe wall, the water pipe wall is protected. It has an excellent effect that the combustion temperature can be maintained within a predetermined temperature range.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a wear resistant block of the present invention.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a schematic configuration diagram showing an example of a fluidized bed boiler.

[Explanation of symbols]

 7 Water pipe wall 8 Abrasion resistant block 10 Insulation material

Claims (1)

[Scope of utility model registration request] 1. A fluidized bed boiler in which a fuel is combusted while fluidizing it together with a fluidizing medium, and a part of the combustion heat is absorbed by a water pipe wall, and an abrasion resistant block is provided inside the water pipe wall. A furnace wall structure for a fluidized bed boiler, which is attached and has a heat insulating material interposed between the wear resistant block and the water pipe wall.