JPH0560318A - Pressurized fluidized bed boiler - Google Patents

Abstract

PURPOSE:To shorten ash discharge pipes in length by a method wherein ash intake ports are provided on both sides of ash coolers, and ash discharge ports of cyclones are respectively connected to closer one of the ash intake ports on both sides of the ash coolers. CONSTITUTION:An ash cooler 34 consists of zigzag pipes 31 and 32. The zigzag pipe 31 is provided with an ash intake port 25 at the lower end and an ash discharge port 27 at the upper end on the same sides. The zigzag pipe 32 is also provided with as an ash intake port 26 and ash discharge port 28 in the same manner. The ash intake ports 25 and 26 are located on both sides of the ash cooler 34. Ash discharge pipes 39 are provided so as to connect ash discharge ports 22 of cyclones 8 respectively to closer one of the ash intake ports 25 and 26 on both sides of the ash coolers 34. Therefore, the discharge pipes 39 can be shortened in length and easily arranged.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art At present, a pressurized fluidized bed boiler has been developed as a boiler having high thermal efficiency and hardly generating environmental pollutants.

A pressurized fluidized bed boiler is, in short, a fluidized bed boiler housed inside a pressure vessel and operated under pressurized conditions. The steam generated in the fluidized bed boiler is guided to a steam turbine to generate electricity. In addition, since the exhaust gas generated in the fluidized bed boiler can be used to rotate the gas turbine to generate electricity and drive the compressor,
It is expected that high thermal efficiency will be obtained.

Further, since the combustion temperature is low and the internal residence time of exhaust gas is long, it is expected that the amount of nitrogen oxides generated will be reduced by supplying the desulfurizing agent together with the fuel.

Furthermore, since high thermal efficiency can be obtained, it is expected that the equipment can be downsized.

A pressurized fluidized bed boiler, which is currently under study, will be described below with reference to FIGS.

In the figure, 1 is a pressure vessel, 2 is a partition wall for partitioning the interior of the pressure vessel 1 into an upper tank 3 and a lower tank 4, 5 is a fluidized bed boiler provided in the lower tank 4, and 6 is a fluidized bed boiler 5. Exhaust gas 7
To the upper tank 3, 8 is a plurality of cyclones connected to the upper end of the duct 6, 9 is an exhaust gas duct connected to the upper part of the cyclone 8 to guide the exhaust gas 7 to the outside of the pressure vessel 1,
Reference numeral 10 is an ash discharge pipe connected to an ash outlet 22 at the bottom of the cyclone 8 to guide the ash 11 separated by the cyclone 8 to the outside of the pressure vessel 1, 12 is an ash cooler provided in the middle of the ash discharge pipe 10, 13 Is an air supply port for supplying high pressure combustion air 14 from the outside to the upper tank 3 of the pressure vessel 1, and 15 is the combustion air 14 provided in the partition wall 2 and having passed through the inside of the ash cooler 12.
Is an air hole that guides to the lower tank 4.

The ash cooler 12, as shown in FIG.
A meandering pipe 20 having an ash intake port 16 at the lower end, an ash intake port 17 located on the same side as the ash intake port 16 at the upper end, and a horizontal part 18 and a folded part 19 alternately in the middle part is provided. , The ash inlet 16 and the ash outlet 17 are arranged so that the positions thereof are the same, and the pipe sheets 21 and 2 are provided near the folding portion 19.
1 through which the combustion air 14 is held between the meandering tubes 20.
Ash flowing inside the meandering tube 20 by passing through
Is designed to be cooled.

Reference numerals 23 and 24 in the figure denote headers for connecting the ash intakes 16 and the ash intakes 17 of the meandering pipes 20 of the ash cooler 12.

In the pressurized fluidized bed boiler, high pressure combustion air 14 pressurized by a turbine or a compressor (not shown) is introduced from the air supply port 13 into the upper tank 3 of the pressure vessel 1, and the upper tank 3 is heated. The combustion air 14 is guided to the lower tank 4 through the ash cooler 12 and the air holes 15 of the partition wall 2, and the combustion air 14 of the lower tank 4 is supplied to the fluidized bed boiler 5 and used for combustion.

Exhaust gas 7 generated as a result of combustion in the fluidized bed boiler 5 passes through a duct 6 and a cyclone 8 in the upper tank 3.
The ash 11 in the exhaust gas 7 is removed by the cyclone 8 and then taken out from the exhaust gas duct 9 to be used for starting a turbine or a compressor (not shown).

On the other hand, the ash 11 removed from the exhaust gas 7 by the cyclone 8 is taken out to the outside through the ash discharge pipe 10, and is cooled by the combustion air 14 in the ash cooler 12 on the way.

[0013]

However, the above-mentioned conventional pressurized fluidized bed boiler has the following problems.

That is, the ash cooler 12 has its ash intake port 16
However, since they were all planned to be on the same side, the ash discharge pipe 10 from the cyclone 8 to the ash cooler 12 has a long and complicated shape, making it difficult to handle the ash discharge pipe 10 inside the pressure vessel 1. There was a fear.

In view of the above situation, it is an object of the present invention to provide a pressurized fluidized bed boiler in which an ash intake port is provided on both sides so that the ash discharge pipe can be shortened. ..

[0016]

According to the present invention, a fluidized bed boiler, a plurality of cyclones for separating ash from exhaust gas generated in the fluidized bed boiler, and ash separated by the cyclone are provided inside a pressure vessel. With an ash cooler for cooling,
A ash intake is provided on both sides of the ash cooler, and the ash intake of each cyclone is connected to an adjacent ash intake of the ash intakes on each side of the ash cooler. It is a thing.

[0017]

According to the present invention, the ash intakes are provided on both sides of the ash cooler, and the ash intakes of each cyclone are connected to the adjacent ash intakes of the ash intakes on each side of the ash cooler. As the ash discharge pipe is shortened, the ash discharge pipe in the upper tank of the pressure vessel can be easily handled.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

Further, in the figure, the same components as those in FIGS. 3 to 5 are designated by the same reference numerals, and the description thereof will be omitted. Hereinafter, only the configuration unique to the present invention will be described.

A meander having an ash intake port 25 at the lower end, an ash intake port 27 located on the same side as the ash intake port 25 at the upper end, and alternating horizontal parts 29 and folding parts 30 in the middle part. A pipe 31 is provided, and an ash intake port 26 is provided at the lower end of the meandering pipe 31 opposite to the ash intake port 25, and an ash intake port 2 is provided at the upper end.
6 has a ash outlet 28 located on the same side as 6, and a meandering pipe 32 having a horizontal portion 29 and a folding portion 30 alternately provided at an intermediate portion, and the meandering tubes 31 and 32 are alternately arranged to form the folding portion 3
The vicinity of 0 is held by passing through the tube plates 33, 33, and an ash cooler 34 having ash intakes 25, 26 and ash intakes 27, 28 on both sides is configured, and the ash cooler 34 has an ash intake 2
5, 3 and ash outlets 27, 28 respectively have headers 3
Install 5, 36, 37, 38.

The ash cooler 34 is arranged in the upper tank 3 of the pressure vessel 1, and the ash intake port 22 of each cyclone 8 is adjacent to the ash intake port 25 of the ash cooler 34.
5 and 26 are connected using an ash discharge pipe 39.

Next, the operation will be described.

The operation of the pressurized fluidized bed boiler itself is the same as in FIGS.

In the present invention, ash intakes 25 and 26 are provided on both sides of the ash cooler 34 so that the ash intakes 22 of the cyclones 8 are adjacent to the ash intakes 25 and 26 on each side of the ash cooler 34. Since the ash discharge pipe 39 is connected to the inlets 25 and 26, the ash discharge pipe 39 can be shortened and the ash discharge pipe 39 inside the upper tank 3 of the pressure vessel 1 can be easily handled.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0027]

As described above, according to the pressurized fluidized bed boiler of the present invention, the excellent effect that the ash discharge pipe can be shortened can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic side view of an ash cooler according to an embodiment of the present invention.

FIG. 2 is a sectional view of a pressurized fluidized bed boiler using the ash cooler of FIG.

FIG. 3 is a schematic overall side view of a pressurized fluidized bed boiler.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a schematic side view of the ash cooler of FIG.

[Explanation of symbols]

 1 Pressure Vessel 5 Fluidized Bed Boiler 7 Exhaust Gas 8 Cyclone 11 Ash 22 Ash Removal Outlet 25,26 Ash Removal Inlet 34 Ash Cooler

Claims (1)

[Claims] 1. A pressure vessel is provided with a fluidized bed boiler, a plurality of cyclones for separating ash from exhaust gas generated in the fluidized bed boiler, and an ash cooler for cooling the ash separated by the cyclone. A pressurized fluidized bed boiler characterized in that ash intakes are provided on both sides of the ash cooler, and the ash intakes of each cyclone are connected to adjacent ash intakes of the ash intakes on each side of the ash cooler.