Combined cycle gas turbine power plant system

Abstract

The utility model provides a combined cycle gas turbine power plant system which at least comprises a waste heat boiler, a bypass chimney and a front module, the bypass chimney and the waste heat boiler are sequentially arranged in the smoke direction, and the bypass chimney and the waste heat boiler are connected through a compensator. The front module is located on one side of the waste heat boiler, a fence is arranged around the front module, a heater is arranged in the front module, and an outlet of a medium-pressure economizer of the waste heat boiler is communicated with the heater through a pipeline. An independent water supply pump room is omitted, the water supply pump room is combined with the steam engine room, a water supply pump and equipment in the steam engine room share an overhaul channel, the size of a building is reduced, and the construction cost is reduced; by arranging the bypass chimney, two operation modes of single cycle and combined cycle of the unit can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power engineering, in particular to a combined cycle gas turbine power plant system. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] The waste heat boiler is an important main equipment of the combined cycle gas turbine power plant. The gas turbine power plant has the characteristics of modular layout. The layout of the waste heat boiler island area is directly related to the safe and economical operation, inspection and maintenance, and project cost of the gas turbine power plant.

[0004] The inventors found that the existing waste heat boiler island area layout scheme is: the waste heat boiler is arranged in the open air, the front module is arranged on one side of the waste heat boiler, and the feed water pump room is arranged on the other side of the waste heat boiler. The feed water pump room is an independent building, and the steam turbine room is independently arranged on one side of the waste heat boiler. Figure 1 As shown, the steam engine room and the gas engine room are arranged together at the lower side of the flue gas inlet of the waste heat boiler, such as Figure 2 As shown, both of the above solutions occupy a large area, which leads to a large initial investment. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the utility model provides a combined cycle gas turbine power plant system, which eliminates the independent feedwater pump room, merges the feedwater pump room with the steam turbine room, and provides a common maintenance passage for the feedwater pump and the equipment in the steam turbine room, thereby reducing the size of the building and the project cost; by setting a bypass chimney, two operating modes of the unit, single cycle and combined cycle, can be achieved.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A combined cycle gas turbine power plant system comprises at least: a waste heat boiler, a bypass chimney and a front module, wherein the bypass chimney and the waste heat boiler are arranged in sequence along the flue gas direction, and the bypass chimney and the waste heat boiler are connected via a compensator;

[0008] The front module is located at one side of the waste heat boiler. A fence is arranged around the front module. A heater is arranged inside the front module. The outlet of the medium-pressure economizer of the waste heat boiler is connected to the heater through a pipeline.

[0009] As a further implementation of the utility model, a three-way baffle is provided in the bypass chimney, and the bypass chimney is connected to the flue gas outlet of the combustion engine through a pipeline. When the three-way baffle door is in a vertical position, the flue gas does not flow through the waste heat boiler, but is directly discharged to the air through the bypass chimney, and the unit is in single-cycle operation;

[0010] When the three-way damper door in the bypass chimney is in a horizontal position, the flue gas channel on the bypass chimney side is closed, the flue gas flows through the waste heat boiler, and the unit operates in a combined cycle.

[0011] As a further implementation of the utility model, the front module is arranged on the left side of the flue gas flow direction of the waste heat boiler, and the steam turbine room is arranged on the right side of the flue gas flow direction of the waste heat boiler; or, the front module is arranged on the right side of the flue gas flow direction of the waste heat boiler, and the steam turbine room is arranged on the left side of the flue gas flow direction of the waste heat boiler.

[0012] As a further implementation of the present invention, an integrated pipe rack is arranged between the front module and the waste heat boiler, and the hot water pipe between the heater and the waste heat boiler is supported and hung on the integrated pipe rack.

[0013] As a further implementation of the present invention, the waste heat boiler is arranged in the open air, and a rainproof canopy is arranged on the top of the waste heat boiler.

[0014] As a further implementation of the utility model, the feed water pump is arranged on one side of the turbine room close to the waste heat boiler.

[0015] As a further implementation of the utility model, the feed water pump includes a high-pressure feed water pump, a medium-pressure feed water pump and a recirculation pump, and the high-pressure feed water pump, the medium-pressure feed water pump and the recirculation pump are all connected to the waste heat boiler through pipelines.

[0016] As a further implementation of the utility model, a maintenance passage is arranged around the steam engine room.

[0017] As a further implementation of the utility model, a frequency conversion power distribution room is arranged on one side of the steam engine room close to the waste heat boiler.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model innovatively proposes a combined cycle gas turbine power plant system, which cancels the independent feedwater pump room, merges the feedwater pump room with the steam turbine room, and provides a common maintenance passage for the feedwater pump and the equipment in the steam turbine room, thereby reducing the size of the building and the project cost.

[0020] 2. The utility model innovatively proposes a combined cycle gas turbine power plant system, which can realize two operating modes of the unit: single cycle and combined cycle by setting a bypass chimney.

[0021] 3. The utility model innovatively proposes a combined cycle gas turbine power plant system. Under the premise of meeting the safety distance, the front module is arranged as close to the waste heat boiler as possible, which can reduce the length of the hot water pipe between the front module and the waste heat boiler, reduce the pipe resistance, and reduce the project investment.

[0022] 4. The utility model innovatively proposes a combined cycle gas turbine power plant system, in which a comprehensive pipe rack is arranged between the front module and the waste heat boiler, so as to facilitate the support and suspension of the hot water pipe between the front module and the waste heat boiler.

[0023] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 It is a schematic diagram of the steam turbine room provided in the background technology being independently arranged on one side of the waste heat boiler;

[0026] Figure 2 It is a schematic diagram of the steam turbine room and the gas turbine room provided in the background technology being arranged together below the flue gas inlet side of the waste heat boiler;

[0027] Figure 3 A schematic diagram of a combined cycle gas turbine power plant system provided by the utility model;

[0028] Figure 4 A schematic diagram of the front module and integrated pipe rack provided by the utility model;

[0029] Figure 5 A schematic diagram of a waste heat boiler provided by the utility model;

[0030] Figure 6 A schematic diagram of a steam engine room provided by the utility model;

[0031] Among them, 1-waste heat boiler; 2-bypass chimney; 3-front module; 4-integrated pipe rack; 5-steam engine room; 6-high-pressure feed water pump; 7-medium-pressure feed water pump; 8-recirculation pump; 9-frequency conversion distribution room; 10-maintenance passage; 11-fence. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] In the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In this implementation, if Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a combined cycle gas turbine power plant system is proposed, which at least includes: a waste heat boiler 1, a bypass chimney 2 and a front module 3, the bypass chimney 2 and the waste heat boiler 1 are arranged in sequence along the flue gas direction, and the bypass chimney 2 and the waste heat boiler 1 are connected through a compensator;

[0036] The front module 3 is located at one side of the waste heat boiler 1. A fence 11 is arranged around the front module 3. A heater is arranged inside the front module 3. The hot water at the outlet of the medium-pressure economizer of the waste heat boiler 1 is connected to the heater through a pipeline.

[0037] In this implementation, further, a three-way baffle is provided in the bypass chimney 2, and the bypass chimney 2 is connected to the flue gas outlet of the combustion engine through a pipeline. When the three-way baffle door is in a vertical position, the flue gas does not flow through the waste heat boiler 1, but is directly discharged to the air through the bypass chimney 2, and the unit is in single-cycle operation;

[0038] When the three-way damper door in the bypass chimney 2 is in a horizontal position, the flue gas channel on the bypass chimney 2 is closed, and the flue gas flows through the waste heat boiler 1. The unit is in combined cycle operation.

[0039] In this implementation, further, the front module 3 is arranged on the left side of the flue gas flow direction of the waste heat boiler 1, and the steam engine room 5 is arranged on the right side of the flue gas flow direction of the waste heat boiler 1; or, the front module 3 is arranged on the right side of the flue gas flow direction of the waste heat boiler 1, and the steam engine room 5 is arranged on the left side of the flue gas flow direction of the waste heat boiler.

[0040] In this implementation, further, an integrated pipe rack 4 is arranged between the front module 3 and the waste heat boiler 1 , and the hot water pipe between the heater and the waste heat boiler 1 is supported and hung on the integrated pipe rack 4 .

[0041] In this implementation, further, the waste heat boiler 1 is arranged in the open air, and a rainproof canopy is arranged on the top of the waste heat boiler 1.

[0042] In this implementation, further, the feed water pump is arranged on one side of the turbine room close to the waste heat boiler 1 to reduce the length of the feed water pipeline connecting the feed water pump and the waste heat boiler.

[0043] In this implementation, further, the feed water pump includes a high-pressure feed water pump 6, a medium-pressure feed water pump 7 and a recirculation pump 8, and the high-pressure feed water pump 6, the medium-pressure feed water pump 7 and the recirculation pump 8 are all connected to the waste heat boiler 1 through pipelines.

[0044] In this implementation, further, a maintenance passage 10 is arranged around the turbine room.

[0045] In this implementation, further, a frequency conversion distribution room 9 is arranged on one side of the steam engine room close to the waste heat boiler 1 .

[0046] In this implementation, the hot water at the outlet of the medium-pressure economizer of the waste heat boiler 1 is supplied to the FGH (heater) through a pipeline for heating natural gas, and the hot water after heating the natural gas is returned to the inlet of the low-pressure economizer of the waste heat boiler 1.

[0047] In this implementation, the hot water pipe between the FGH (heater) and the waste heat boiler can be supported and hung on the integrated pipe rack.

[0048] Optionally, in some other implementations, the ancillary equipment of the waste heat boiler mainly includes a continuous row expansion tank, a fixed row expansion tank, an elevator, a staircase, a denitrification equipment and a fixed row cooling water tank, etc.

[0049] The utility model eliminates the independent water supply pump room and arranges the water supply pumps in the turbine room, that is, the water supply pump room and the turbine room are arranged together. The water supply pumps include two high-pressure water supply pumps 6, two medium-pressure water supply pumps 7 and two recirculation pumps 8.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A combined cycle gas turbine power plant system, characterized in that: At least: Waste heat boiler, bypass chimney and front module, the bypass chimney and waste heat boiler are arranged in sequence along the flue gas direction, and the bypass chimney and waste heat boiler are connected through a compensator; The front module is located at one side of the waste heat boiler. A fence is arranged around the front module. A heater is arranged inside the front module. The outlet of the medium-pressure economizer of the waste heat boiler is connected to the heater through a pipeline.

2. The combined cycle gas turbine power plant system according to claim 1, characterized in that: The front module is arranged on the left side of the flue gas flow direction of the waste heat boiler, and the steam turbine room is arranged on the right side of the flue gas flow direction of the waste heat boiler; or, the front module is arranged on the right side of the flue gas flow direction of the waste heat boiler, and the steam turbine room is arranged on the left side of the flue gas flow direction of the waste heat boiler.

3. The combined cycle gas turbine power plant system according to claim 1, characterized in that: An integrated pipe rack is arranged between the front module and the waste heat boiler, and the hot water pipe between the heater and the waste heat boiler is supported and hung on the integrated pipe rack.

4. The combined cycle gas turbine power plant system according to claim 1, characterized in that: The waste heat boiler is arranged in the open air, and a rainproof shed is arranged on the top of the waste heat boiler.

5. The combined cycle gas turbine power plant system according to claim 1, characterized in that: The steam engine room is arranged on the right side of the flue gas flow direction of the waste heat boiler.

6. The combined cycle gas turbine power plant system according to claim 5, characterized in that: The feed water pump is arranged on one side of the turbine room close to the waste heat boiler.

7. The combined cycle gas turbine power plant system according to claim 6, characterized in that: The feed water pump comprises a high-pressure feed water pump, a medium-pressure feed water pump and a recirculation pump, and the high-pressure feed water pump, the medium-pressure feed water pump and the recirculation pump are all connected to the waste heat boiler through pipelines.

8. The combined cycle gas turbine power plant system according to claim 5, characterized in that: There are maintenance passages arranged around the steam engine room.

9. The combined cycle gas turbine power plant system according to claim 5, characterized in that: A frequency conversion distribution room is arranged on one side of the steam turbine room close to the waste heat boiler.

10. The combined cycle gas turbine power plant system according to any one of claims 1 to 9, characterized in that: A three-way baffle is installed in the bypass chimney. The bypass chimney is connected to the flue gas outlet of the gas turbine through a pipeline. When the three-way baffle door is in a vertical position, the flue gas does not flow through the waste heat boiler, but is directly discharged to the air through the bypass chimney. The unit is in single-cycle operation. When the three-way damper door in the bypass chimney is in a horizontal position, the flue gas channel on the bypass chimney side is closed, the flue gas flows through the waste heat boiler, and the unit operates in a combined cycle.

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