JPH0942613A - Gas pressure measuring device for pressure fluidized bed boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the sure removal of bed material which fills a measuring seat. SOLUTION: The gas pressure measuring device of a pressure fluidized bed boiler is provided with a measuring seat 21, projectingly provided on the side surface of the fluidized bed boiler 2 installed in the pressure vessel 1 of pressurized atmosphere, a measuring pipeline 22, having a pressure meter 24 and connected to the measuring seat 21, a hole 25, bored on the tip end of the measuring seat 21, and a purge gas supplying pipe 27, connected to the measuring pipeline 22. A check valve 29, allowing the flow of gas from the pressure vessel 1 into the measuring seat 21 but precluding the flow of gas from the measuring seat 21 into the pressure vessel 1, is attached to the hole 25. In this case, purge gas 28 is prevented from leaking into the pressure vessel 1 through the hole 25 and all of the purge gas is conducted so as to flow toward the fluidized bed boiler 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a gas pressure measuring device for a pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art An example of a pressurized fluidized bed boiler will be described with reference to FIG. 2. The pressure vessel 1 has a pressurized atmosphere inside.
A fluidized bed boiler 2 is provided inside, and a plurality of air diffusers 3 extending in the left-right direction in the drawing are arranged side by side in the lower part in the fluidized bed boiler 2. Pressure vessel 1
The pressurized air 4 inside is taken in through the lower intake port 3a and jetted upward.

A fuel supply pipe 5 for supplying a fuel such as coal particles or coal slurry is disposed above the air diffuser pipe 3, and a desulfurization material such as limestone for forming a fluidized bed 6,
The bed material 7 mixed with sand or the like is supplied, and the pressurized air 4 supplied from the compressor 8 into the pressure vessel 1 is supplied to the diffuser pipe 3 from the lower intake port 3a and jetted upward to flow. The layer 6 is formed, and the fuel supplied from the fuel supply pipe 5 is agitated and efficiently burned in the fluidized bed 6, so that the heat transfer pipe 9 disposed in the formation portion of the fluidized bed 6 causes water to flow. Is heated to generate steam.

Further, the ash produced by the combustion and a part of the bed material 7 fall from between the air diffusers 3 to the ash discharge hopper 10 provided on the lower side, and the ash discharge pipe 11 at the lower part is removed. It is designed to be taken out through the bottom.

At the upper part of the fluidized bed boiler 2, a plurality of (for example, 6) cyclones 14 through which the high-temperature high-pressure exhaust gas 12 after heating the water in the heat transfer tube 9 is guided through a branch duct 13 are provided. Then, the ash in the exhaust gas 12 is separated. The exhaust gas 12 from which the ash has been separated by the cyclone 14 is supplied to a gas turbine 16 provided outside the pressure vessel 1 via an exhaust gas pipe 15 and the gas turbine 1
6, the gas turbine 16 drives the compressor 8 described above, and the gas turbine generator 1 is driven by the surplus power.
It is designed to drive 7.

Separated ash 1 separated by the cyclone 14
The ash cooler 19 is cooled by the pressurized air 4 in the ash cooler 19 and then transported to the outside of the pressure vessel 1 by the ash transport pipe 20.

In the fluidized bed boiler 2, it is necessary to constantly measure the pressure in the fluidized bed boiler 2 during operation. Therefore, a measurement seat 21 is provided on the side surface of the fluidized bed boiler 2 and a pressure gauge 24 is connected via a measurement pipe 22 and a valve 23.

However, in the fluidized bed boiler 2, especially in the fluidized bed 6, since the particles of the bed material 7 mixed with desulfurization material such as limestone and sand are vigorously moving, the inside of the measuring seat 21 is clogged with the bed material 7. Will end up.

For this reason, a hole 25 is formed at the tip of the measuring seat 21 so that the pressurized air 4 in the pressure vessel 1 can flow from the hole 25 into the measuring seat 21.
To flow inside the fluidized bed boiler 2 to prevent the inside of the measuring seat 21 from being clogged with the bed material 7.

However, even in this case, the inside of the measuring seat 21 may be clogged with the bed material 7 during the adjustment of the trial run, so that the purge gas supply pipe 27 is connected to the measuring pipe 22 via the purge gas supply valve 26. High-pressure air, purge gas 28 such as nitrogen gas is blown into the inside of the measurement seat 21 from the purge gas supply pipe 27 through the purge gas supply valve 26 and the measurement pipe 22, and the bed material 7 clogged inside the measurement seat 21 is moved to the fluidized bed boiler. It is designed to be blown into the inside of 2.

[0011]

However, in the conventional gas pressure measuring device, since the hole 25 is formed at the tip of the measuring seat 21, the purge gas 28 blown into the measuring seat 21 passes through the hole 25. It leaks to the pressure vessel 1,
There is a drawback that the bed material 7 clogged inside the measuring seat 21 cannot be reliably blown into the inside of the fluidized bed boiler 2.

The present invention eliminates such conventional drawbacks,
An object of the present invention is to provide a gas pressure measuring device for a pressurized fluidized bed boiler, which is capable of surely removing the bed material clogged inside the measuring seat.

[0013]

A gas pressure measuring apparatus for a pressurized fluidized bed boiler according to the present invention comprises a measuring seat projecting from a side surface of the fluidized bed boiler installed in a pressure vessel of a pressurized atmosphere. A measurement pipe having a pressure gauge and connected to the measurement seat,
A gas pressure measuring device for a pressurized fluidized bed boiler, comprising: a hole drilled at the tip of the measuring seat; and a purge gas supply pipe connected to the measuring pipe. The hole is provided with a check valve that allows the flow of gas and blocks the flow of gas from the measurement seat into the pressure vessel.

Normally, it is prevented that the pressurized air in the pressure vessel opens the check valve, flows into the inside of the measuring seat, flows toward the inside of the fluidized bed boiler, and the inside of the measuring seat is clogged with the bed material. To do.

When the inside of the measuring seat is clogged with the bed material, when the purge gas is supplied from the purge gas supply pipe, the check valve prevents the purge gas from flowing toward the pressure vessel,
Since all the purge gas flows into the inside of the measurement seat, the bed material clogged inside the measurement seat is efficiently blown into the inside of the fluidized bed boiler.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of an embodiment for carrying out the present invention. In FIG. 1, the same parts as those shown in FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 1, a check valve 29 is attached to a hole 25 at the tip of a measuring seat 21 projecting from the side surface of the fluidized bed boiler 2.

The check valve 29 opens the valve for the gas flowing in the direction from the pressure vessel 1 to the inside of the measuring seat 21, and allows the flow, but from the inside of the measuring seat 21 to the inside of the pressure vessel 1. A valve closes to block the flow of gas to the flow.

Next, the operation of the apparatus shown in FIG. 1 will be described.

During normal operation of the fluidized bed boiler 2, the valve 23 is opened and the purge gas supply valve 26 is kept closed. As a result, the pressure inside the fluidized bed boiler 2 during operation is displayed on the pressure gauge 24. Then, the pressurized air 4 in the pressure vessel 1 opens the check valve 29 and flows into the inside of the measurement seat 21, and the inside of the measurement seat 21 is clogged with the bed material 7 while flowing toward the fluidized bed boiler 2. Prevent.

When the inside of the measuring seat 21 is clogged with the bed material 7, the purge gas supply valve 26 is opened and high pressure air in the purge gas supply pipe 27 and the purge gas 28 such as nitrogen gas are supplied to the measurement pipe 22. It blows into the inside of the measurement seat 21 via.

At this time, the check valve 29 closes the gas flowing in the pressure vessel 1 from the measurement seat 21,
The purge gas 28 blown into the measurement seat 21 does not leak to the pressure vessel 1 and is effective in blowing all the purge gas 28 into the fluidized bed boiler 2 of the bed material 7 clogged inside the measurement seat 21. To be used for.

The gas pressure measuring device for a pressurized fluidized bed boiler according to the present invention is not limited to the above-described example of the embodiment, and various modifications may be made without departing from the scope of the present invention. Of course you can get it.

[0025]

As described above, according to the gas pressure measuring device for a pressurized fluidized bed boiler of the present invention, the purge gas for blowing off the bed material clogged inside the measuring seat does not leak to the pressure vessel, Since the bed material clogged inside the measuring seat is effectively used for blowing it toward the fluidized bed boiler, the bed material clogged inside the measuring seat can be reliably removed.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of an embodiment for implementing the present invention.

FIG. 2 is a system diagram showing an example of a conventional gas pressure measuring device for a pressurized fluidized bed boiler.

[Explanation of symbols]

 1 Pressure Vessel 2 Fluidized Bed Boiler 21 Measuring Seat 22 Measuring Pipe 24 Pressure Gauge 25 Hole 27 Purge Gas Supply Pipe 29 Check Valve

Claims (1)

[Claims] 1. A measurement seat projecting from a side surface of a fluidized bed boiler installed in a pressure vessel of a pressurized atmosphere, a measurement pipe having a pressure gauge and connected to the measurement seat, and the measurement seat. A gas pressure measuring device for a pressurized fluidized bed boiler equipped with a hole drilled at the tip of a gas pipe and a purge gas supply pipe connected to the measuring pipe, the flow of gas from inside the pressure vessel into the measuring seat. A gas pressure measuring device for a pressurized fluidized bed boiler, characterized in that a check valve for allowing the flow of gas from the measurement seat to the pressure vessel is blocked in the hole.