JPH0590107U - Pressurized fluidized bed boiler - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the responsiveness to load changes and reduce the burden of pressure acting on the boiler body. [Structure] The inside of the pressure vessel 1 and the inside of the boiler main body 2 are isolated from each other, and the compressed air supply pipe line 7 of the compressor 5 is connected to the bottom of the boiler main body 2 so that compressed air is directly supplied into the boiler main body 2, A supply pipe line 13 for supplying a pressure fluid and a discharge pipe line 14 for discharging the pressure fluid are connected to the container 1, and pressure adjusting valves 15, 16 are provided in the middle of the supply pipe line 13 and the discharge pipe line 14, respectively. Pressure gauge 1 for detecting the internal pressure of container 1
7, the pressure gauge 18 for detecting the internal pressure of the boiler main body 2, and the pressure control valves 15 so that the internal pressures of the pressure vessel 1 and the boiler main body 2 become substantially equal based on the detection signals 19, 20 from the pressure gauges 17, 18. , 16 are provided with a control device 23 for outputting the control signals 21, 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressurized fluidized bed boiler.

[0002]

[Prior Art]

 As shown in FIG. 2, a conventional pressurized fluidized bed boiler uses a bed material 3 in a boiler body 2 provided in a pressure vessel 1 from a compressor 5 driven by a gas turbine 4 to a compressed air supply pipeline. It is designed to be fluidized by compressed air supplied via 7.

The compressed air supply line 7 is connected to the bottom of the pressure vessel 1, a plurality of holes 8 are formed in the bottom of the boiler body 2, and compressed air is supplied into the pressure vessel 1. It is introduced into the boiler main body 2 through the hole 8 to form a fluidized bed, and fuel is supplied to the fluidized bed from a fuel supply line (not shown) to perform combustion, and its thermal energy is put into a flowing state. The steam turbine is driven by being transmitted to a reheater and a superheater (not shown) installed so as to be buried in a certain bed material 3.

The combustion gas of the fuel burned in the boiler main body 2 is supplied to the gas turbine 4 after the dust collector 10 removes soot dust and the like, and the generator 6 is driven. At the same time, the compressor 5 is driven.

[0005]

[Problems to be solved by the device]

 In the conventional pressurized fluidized bed boiler as described above, in order to increase or decrease the bed height of the fluidized bed when the load changes, the flow rate of the compressed air supplied to the pressure vessel 1 by adjusting the rotational speed of the compressor 5 and the like. Although the pressure is changed, there is a problem that the response is poor because the pressure vessel 1 has a very large capacity.

Further, in the case of the conventional pressurized fluidized bed boiler, as can be seen from the fact that the compressed air supplied into the pressure vessel 1 is introduced into the boiler body 2 through the holes 8, the pressure vessel 1 The internal pressure and the internal pressure of the boiler main body 2 are not completely equal, the internal pressure of the boiler main body 2 is slightly lower, and a slight external pressure is acting on the boiler main body 2. It was necessary to increase the strength of the boiler body 2 in design as compared with the case where it works.

In view of such circumstances, the present invention intends to provide a pressurized fluidized bed boiler capable of improving the responsiveness to a load change and reducing the burden due to the pressure acting on the boiler body. Is.

[0008]

[Means for Solving the Problems]

 The present invention relates to a pressurized fluidized bed boiler in which the bed material in the boiler main body provided in the pressure vessel is fluidized by the compressed air supplied from the compressor driven by the gas turbine through the compressed air supply pipeline. Isolate the inside of the pressure vessel from the inside of the boiler main body, and connect the compressed air supply pipeline of the compressor to the bottom of the boiler main body so that compressed air is directly supplied into the boiler main body. Connect the supply pipeline that supplies the pressure fluid to the inside and the discharge pipeline that discharges the pressure fluid from the inside of the pressure vessel, and install a pressure adjustment valve in the middle of the supply pipeline and in the middle of the discharge pipeline. A pressure gauge for detecting the internal pressure of the boiler and a pressure gauge for detecting the internal pressure of the boiler main body are provided, and the internal pressure of the pressure vessel and the internal pressure of the boiler main body are substantially equal based on the detection signals from the respective pressure gauges. In which characterized in that a control device for outputting a control signal to so that the respective pressure regulating valves.

[0009]

[Action]

 Therefore, the compressed air from the compressor is directly supplied into the boiler main body through the compressed air supply line to fluidize the bed material.At this time, the internal pressure of the pressure vessel and the internal pressure of the boiler main body are adjusted by each pressure gauge. When a control signal is output from the control device to each pressure control valve based on the detection signal from each pressure gauge, and the internal pressure of the pressure vessel is lower than the internal pressure of the boiler body, the pressure is fed from the supply line to the inside of the pressure vessel. When the pressure fluid is supplied and the internal pressure of the pressure vessel is higher than the internal pressure of the boiler body, the pressure fluid in the pressure vessel is discharged from the discharge pipeline, which causes the internal pressure of the pressure vessel and the internal pressure of the boiler body. Are always kept almost equal, and when the compressor rotation speed is adjusted in order to increase or decrease the height of the fluidized bed when the load changes, the compressed air does not flow directly through the pressure vessel but directly inside the boiler body. Offering Since the flow rate and pressure of the compressed air in the boiler body rapidly changes, the bed height of the fluidized bed is increased or decreased with good responsiveness.

[0010]

【Example】

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

FIG. 1 shows an embodiment of the present invention. In the figure, the parts designated by the same reference numerals as in FIG. 2 represent the same thing, and the inside of the pressure vessel 1 and the inside of the boiler body 2 are separated from each other. Then, the compressed air supply pipe line 7 of the compressor 5 is connected to the bottom of the boiler body 2 so that compressed air is directly supplied into the boiler body 2, and the pressure vessel 1 is stored in the accumulator 12 from the boosting compressor 11. The supply pipe line 13 for supplying the pressure fluid such as air to the pressure container 1 and the discharge pipe line 14 for discharging the pressure fluid from the pressure container 1 are connected to each other, and the middle of the supply pipe line 13 and the discharge pipe line. Pressure control valves 15 and 16 are provided in the middle of the passage 14, and a pressure gauge 17 that detects the internal pressure of the pressure vessel 1 and a pressure gauge 18 that detects the internal pressure of the boiler body 2 are provided, and the pressure gauges 17 and 18 Detection signal 19, 20 Based on the above, a control device 23 is provided for outputting control signals 21 and 22 to the pressure adjusting valves 15 and 16 so that the internal pressure of the pressure vessel 1 and the internal pressure of the boiler body 2 become substantially equal.

A circulation line 24 for circulating the pressure fluid in the pressure vessel 1 is connected to the pressure vessel 1, and a blower 25 for pressure fluid circulation and a pressure flow are provided in the middle of the circulation vessel 24. A cooler 26 for cooling the body is provided.

Next, the operation of the above embodiment will be described.

Compressed air from the compressor 5 is directly supplied into the boiler main body 2 through the compressed air supply pipe line 7 to fluidize the bed material 3, and at this time, the pressure gauges 17 and 18 pressure the pressure vessels. The internal pressure of 1 and the internal pressure of the boiler main body 2 are detected. Based on the detection signals 19 and 20 from the pressure gauges 17 and 18, the control device 23 outputs control signals 21 and 22 to the pressure control valves 15 and 16, respectively. When the internal pressure of the container 1 is lower than the internal pressure of the boiler main body 2, the pressure fluid is supplied into the pressure container 1 from the supply pipeline 13, and the internal pressure of the pressure container 1 is higher than the internal pressure of the boiler main body 2. At this point, the pressure fluid in the pressure vessel 1 is discharged from the discharge pipeline 14, whereby the internal pressure of the pressure vessel 1 and the internal pressure of the boiler body 2 are always kept substantially equal.

On the other hand, when the rotation speed of the compressor 5 is adjusted to increase or decrease the bed height of the fluidized bed when the load changes, the compressed air is directly supplied into the boiler body 2 without passing through the pressure vessel 1. Therefore, the flow rate and the pressure of the compressed air in the boiler body 2 change rapidly, and the bed height of the fluidized bed is increased or decreased with good responsiveness.

When the temperature inside the pressure vessel 1 is raised by heat transfer from the boiler body 2 and the like, the blower 25 is driven to guide the pressure fluid in the pressure vessel 1 to the circulation pipe line 24, and the cooler 26 After being cooled by, it is returned to the inside of the pressure vessel 1 again, whereby the temperature inside the pressure vessel 1 is kept substantially constant.

In this way, the responsiveness to load changes can be improved, the stress due to the difference between the internal pressure and the external pressure acting on the boiler main body 2 can be made smaller than before, and the design pressure of the boiler main body 2 can be made small. .

It is also possible to make the internal pressure of the pressure vessel 1 slightly lower than the internal pressure of the boiler main body 2 depending on the setting method. A state in which the internal pressure acts can be created, and the pressure acting on the boiler body 2 can be designed so that only the internal pressure is considered.

Furthermore, since the pressure fluid in the pressure vessel 1 is guided to the circulation line 24 equipped with the cooler 26 and circulated as necessary, the temperature in the pressure vessel 1 can be maintained substantially constant. It is also possible to lower the design temperature of the pressure vessel 1.

The pressurized fluidized bed boiler of the present invention is not limited to the above embodiment, but steam may be used instead of air as the pressure fluid. It is needless to say that various modifications can be made within the range that does not deviate from the gist of the present invention, such as not necessarily providing the circulation pipeline provided with.

[0021]

[Effect of the device]

 As described above, according to the pressurized fluidized bed boiler of the present invention, it is possible to improve the responsiveness to a load change and to exert the excellent effect of reducing the load due to the pressure acting on the boiler body.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional example.

[Explanation of symbols]

 1 Pressure Vessel 2 Boiler Main Body 3 Bed Material 4 Gas Turbine 5 Compressor 7 Compressed Air Supply Pipeline 13 Supply Pipeline 14 Discharge Pipeline 15 Pressure Regulator Valve 16 Pressure Regulator Valve 17 Pressure Gauge 18 Pressure Gauge 19 Detection Signal 20 Detection Signal 21 Control Signal 22 Control signal 23 Control device

Claims (1)

[Scope of utility model registration request] 1. A pressurized fluidized bed boiler for fluidizing a bed material in a boiler main body provided in a pressure vessel with compressed air supplied from a compressor driven by a gas turbine through a compressed air supply pipe line. In, the inside of the pressure vessel is separated from the inside of the boiler body, and the compressed air supply pipeline of the compressor is connected to the bottom of the boiler body so that the compressed air is directly supplied to the inside of the boiler body. A supply pipeline for supplying a pressure fluid to the inside and a discharge pipeline for discharging the pressure fluid from inside the pressure vessel are connected,
A pressure adjusting valve is provided in the middle of the supply pipeline and the discharge pipeline, and a pressure gauge for detecting the pressure inside the pressure vessel and a pressure gauge for detecting the internal pressure of the boiler main body are provided, and a detection signal from each pressure gauge is provided. A pressure fluidized bed boiler is provided with a control device for outputting a control signal to each of the pressure regulating valves so that the internal pressure of the pressure vessel and the internal pressure of the boiler main body are substantially equal to each other.