CN115199366A - Dual-fuel gas-steam combined cycle power device - Google Patents

Dual-fuel gas-steam combined cycle power device Download PDF

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Publication number
CN115199366A
CN115199366A CN202210063089.0A CN202210063089A CN115199366A CN 115199366 A CN115199366 A CN 115199366A CN 202210063089 A CN202210063089 A CN 202210063089A CN 115199366 A CN115199366 A CN 115199366A
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China
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communicated
combustion chamber
channel
steam
temperature heat
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Chinese (zh)
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李鸿瑞
李华玉
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/14—Gas-turbine plants characterised by the use of combustion products as the working fluid characterised by the arrangement of the combustion chamber in the plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/08—Heating air supply before combustion, e.g. by exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/22—Fuel supply systems
    • F02C7/228—Dividing fuel between various burners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention provides a dual-fuel gas-steam combined cycle power device, belonging to the technical field of thermodynamics and thermodynamics. The external part is provided with a low-grade fuel channel communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel communicated with the secondary section combustion chamber, the external part is also provided with an air channel communicated with the primary section combustion chamber through a compressor and a high-temperature heat regenerator, the primary section combustion chamber is also provided with a primary section gas channel communicated with the secondary section combustion chamber, the secondary section combustion chamber is also provided with a gas channel communicated with the gas turbine, then the gas turbine is provided with a gas channel communicated with the gas turbine through the high-temperature heat regenerator, and the gas turbine is also provided with a gas channel communicated with the external part through a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is further provided with a steam channel which is communicated with a steam turbine, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form a dual-fuel gas-steam combined cycle power device.

Description

Dual-fuel gas-steam combined cycle power device
The technical field is as follows:
the invention belongs to the technical field of thermodynamics and thermodynamics.
Background art:
cold demand, heat demand and power demand, which are common in human life and production; among them, the conversion of chemical energy of high-quality fuel into thermal energy by combustion and the efficient conversion of thermal energy into mechanical energy by a gas-steam power device are important means for providing power or electricity to human beings.
The fuel has different types and different properties, wherein the temperature of fuel gas formed by burning the fuel directly determines the heat power conversion efficiency; from the view of the temperature of fuel gas formed by combustion (such as constant pressure combustion temperature), high-grade fuel with high constant pressure combustion temperature can convert more mechanical energy corresponding to a high-grade heat source; low-grade fuel with low constant pressure combustion temperature is difficult to form high-temperature combustion products, and can convert less mechanical energy corresponding to a low-grade heat source compared with the former.
In a conventional gas-steam power device, the adopted fuels such as gasoline, diesel oil, natural gas and the like are high-quality high-grade fuels; due to the limitation of the working principle or material properties or equipment manufacturing level and the like, in the combustion process of forming a high-temperature heat source by high-quality and high-grade fuel, the difference between the temperature of a combustion-supporting medium (such as air) and the constant-pressure combustion temperature of the fuel is large, and large temperature difference irreversible loss exists in the combustion process, so that the quality loss in fuel utilization is caused, however, the opportunity is provided for the low-grade fuel to participate in the construction of the heat source.
The invention provides a dual-fuel gas-steam combined cycle power device which reasonably matches and uses low-grade fuel and high-grade fuel, realizes the complementation of advantages and shortages, greatly improves the heat power conversion efficiency of the low-grade fuel, reduces the emission of greenhouse gas and can effectively reduce the fuel cost.
The invention content is as follows:
the invention mainly aims to provide a dual-fuel gas-steam combined cycle power device, and the specific invention contents are explained in detail as follows:
1. the double-fuel gas-steam combined cycle power plant mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber and a second-stage combustion chamber; the external part of the combustor is provided with a low-grade fuel channel communicated with the primary section combustor, the external part of the combustor is also provided with a high-grade fuel channel communicated with the secondary section combustor, the external part of the combustor is also provided with an air channel communicated with the primary section combustor through a compressor, the primary section combustor is also provided with a primary section fuel gas channel communicated with the secondary section combustor, and the secondary section combustor is also provided with a fuel gas channel communicated with the external part through a gas turbine and a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is communicated with a steam turbine through a steam channel, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form the dual-fuel gas-steam combined cycle power device.
2. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel communicated with the secondary section combustion chamber, the external part is also provided with an air channel communicated with the primary section combustion chamber through a compressor and a high-temperature heat regenerator, the primary section combustion chamber is also provided with a primary section fuel gas channel communicated with the secondary section combustion chamber, and the secondary section combustion chamber is also provided with a fuel gas channel communicated with the external part through a gas turbine, the high-temperature heat regenerator and a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is further provided with a steam channel which is communicated with a steam turbine, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form the dual-fuel gas-steam combined cycle power device.
3. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber, a second-stage combustion chamber and a high-temperature heat regenerator; the external part of the two-stage combustor is provided with a low-grade fuel channel communicated with the primary section combustor, the external part of the two-stage combustor is also provided with a high-grade fuel channel communicated with the secondary section combustor, the external part of the two-stage combustor is also provided with an air channel communicated with the primary section combustor through a compressor, the primary section combustor is also provided with a primary section fuel gas channel communicated with the secondary section combustor through a high-temperature heat regenerator, and the secondary section combustor is also provided with a fuel gas channel communicated with the external part through a gas turbine, the high-temperature heat regenerator and a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is communicated with a steam turbine through a steam channel, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form a dual-fuel gas-steam combined cycle power device.
4. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel communicated with the secondary section combustion chamber, the external part is also provided with an air channel communicated with the compressor, the compressor is further provided with an air channel communicated with the primary section combustion chamber through a high-temperature heat regenerator, the primary section combustion chamber is further provided with a primary section gas channel communicated with the secondary section combustion chamber, and the secondary section combustion chamber is further provided with a gas channel communicated with the external part through a gas turbine, the high-temperature heat regenerator and a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is further provided with a steam channel which is communicated with a steam turbine, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form a dual-fuel gas-steam combined cycle power device.
5. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel communicated with the secondary section combustion chamber, the external part is also provided with an air channel communicated with the primary section combustion chamber through a compressor and a high-temperature heat regenerator, the primary section combustion chamber is also provided with a primary section gas channel communicated with the secondary section combustion chamber, the secondary section combustion chamber is also provided with a gas channel communicated with the gas turbine, then the gas turbine is provided with a gas channel communicated with the gas turbine through the high-temperature heat regenerator, and the gas turbine is also provided with a gas channel communicated with the external part through a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is communicated with a steam turbine through a steam channel, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form the dual-fuel gas-steam combined cycle power device.
6. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel which is communicated with the secondary section combustion chamber, the external part is also provided with an air channel which is communicated with the primary section combustion chamber through a compressor, the primary section combustion chamber is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber through a high-temperature heat regenerator, the secondary section combustion chamber is also provided with a gas channel which is communicated with the gas turbine, then the gas turbine is also provided with a gas channel which is communicated with the gas turbine through the high-temperature heat regenerator, and the gas turbine is also provided with a gas channel which is communicated with the external part through a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is communicated with a steam turbine through a steam channel, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form the dual-fuel gas-steam combined cycle power device.
7. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the primary section combustion chamber, the external part is also provided with a high-grade fuel channel which is communicated with the secondary section combustion chamber, the external part is also provided with an air channel which is communicated with the compressor and then is provided with an air channel which is communicated with the compressor by a high-temperature heat regenerator, the compressor is also provided with an air channel which is communicated with the primary section combustion chamber, the primary section combustion chamber is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber, the secondary section combustion chamber is also provided with a gas channel which is communicated with the gas turbine and then is provided with a gas channel which is communicated with the compressor by the high-temperature heat regenerator, and the gas turbine is also provided with a gas channel which is communicated with the external part by a high-temperature heat exchanger; the condenser is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger through a booster pump, then the high-temperature heat exchanger is further provided with a steam channel which is communicated with a steam turbine, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine is connected with the compressor and transmits power to form a dual-fuel gas-steam combined cycle power device.
8. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices in items 1-7, a high heat exchanger is adjusted to be communicated with a steam turbine through a steam channel, and the high heat exchanger is adjusted to be communicated with the steam turbine through a primary combustion chamber through the steam channel, so that the dual-fuel gas-steam combined cycle power device is formed.
9. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices 1 to 7, a high heat exchanger with a steam channel is communicated with a steam turbine, and the high heat exchanger with the steam channel is communicated with the steam turbine, and then the steam turbine with the steam channel is communicated with the steam turbine through a primary combustion chamber to form the dual-fuel gas-steam combined cycle power device.
10. A dual-fuel gas-steam combined cycle power device is characterized in that a second booster pump and a low-temperature heat regenerator are added in any one of the dual-fuel gas-steam combined cycle power devices in items 1-9, a condenser is adjusted to be communicated with a condensate pipeline through the booster pump, the condenser is adjusted to be communicated with the low-temperature heat regenerator through the condensate pipeline, a steam turbine is provided with a steam extraction channel to be communicated with the low-temperature heat regenerator, and the low-temperature heat regenerator is communicated with the booster pump through the condensate pipeline, so that the dual-fuel gas-steam combined cycle power device is formed.
11. A dual-fuel gas-steam combined cycle power device is characterized in that an expansion speed increaser is added to any one of the dual-fuel gas-steam combined cycle power devices in items 1 to 9 to replace a steam turbine, and a diffuser pipe is added to replace a booster pump to form the dual-fuel gas-steam combined cycle power device.
12. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices described in item 10, an expansion speed increaser is added to replace a steam turbine, a diffuser pipe is added to replace a booster pump, and a second diffuser pipe is added to replace a second booster pump, so that the dual-fuel gas-steam combined cycle power device is formed.
Description of the drawings:
FIG. 1 is a schematic thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant 1 provided in accordance with the present invention.
FIG. 2 is a schematic thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant of type 2 provided in accordance with the present invention.
FIG. 3 is a schematic thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant of type 3 provided in accordance with the present invention.
FIG. 4 is a 4 th principal thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 5 is a diagram of a 5 th principle thermodynamic system of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 6 is a diagram of a 6 th principle thermodynamic system of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 7 is a 7 th principle thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 8 is a diagram of a 8 th principle thermodynamic system of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 9 is a diagram of a 9 th principal thermodynamic system of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 10 is a 10 th principal thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 11 is a diagram of a 11 th principal thermodynamic system of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
FIG. 12 is a 12 th principle thermodynamic system diagram of a dual fuel gas-steam combined cycle power plant provided in accordance with the present invention.
In the figure, 1-a steam turbine, 2-a booster pump, 3-a condenser, 4-a high-temperature heat exchanger, 5-a compressor, 6-a gas turbine, 7-a primary section combustion chamber, 8-a secondary section combustion chamber, 9-a high-temperature heat regenerator, 10-a second booster pump, 11-a low-temperature heat regenerator, 12-an expansion speed increaser, 13-a diffuser pipe and 14-a second diffuser pipe.
Regarding the expansion speed increaser, the primary combustion chamber, the low-grade fuel, the high-grade fuel and the primary fuel gas, the following brief descriptions are given here:
(1) In order to reveal the differences in the operational sequences of the steam turbine 1 and the expansion gear 12, the following explanations are made:
(1) in fig. 1, steam flows through a steam turbine 1 to achieve thermal work, the steam at the outlet of the steam turbine 1 has a very low pressure and a small flow rate (corresponding to a small kinetic energy), and the mechanical energy required by a booster pump 2 can be supplied by the steam turbine 1 through mechanical transmission or from the outside.
(2) In contrast, in fig. 11, the steam at the outlet of the expansion speed increaser 12 also has a very low pressure, but the flow rate is relatively large (a part of the pressure drop is converted into the kinetic energy of the low-pressure steam) to meet the requirement of reducing the speed and increasing the pressure of the diffuser pipe 13.
(3) The process of the steam flowing through the steam turbine 1 to realize the thermal variable work in fig. 1 adopts the decompression work, and the process of the steam flowing through the expansion speed increaser 12 to realize the thermal variable work in fig. 11 adopts the decompression work and the speed increase.
(2) Description on the primary combustion chamber and the primary gas:
(1) according to the requirement, a related heat exchanger (heat exchange tube bundle) is arranged in the primary combustion chamber; for example, fig. 8 shows a superheater that heats steam from the high-temperature heat exchanger 3, and fig. 9 shows a reheater that heats steam from the steam turbine 1.
(2) The specific heat exchange tube bundle (superheater or reheater) is not specifically designated, but is collectively expressed by using a primary stage combustor.
(3) In the application of the invention, the primary combustion chamber 7 provides heat source initial section construction heat load and undertakes the heating task of air entering the secondary combustion chamber 8; in some cases, the heating task of the circulating steam of the bottom Rankine cycle subsystem is also undertaken.
(4) Initial stage gas: the gas supplied to the secondary combustion chamber 8 from the primary combustion chamber 7 contains air required for combustion of the high-grade fuel in the secondary combustion chamber 8, i.e., the primary gas is rich in air components.
(3) Description of the fuels:
(1) low-grade fuel: refers to a fuel whose combustion products are difficult to form a high temperature heat source of higher temperature.
(2) High-grade fuel: refers to a fuel whose combustion products are capable of forming a high temperature heat source of relatively high temperature.
(3) The technical measures described in the first application of the present invention provide a high temperature thermal load for the same fuel, and the primary combustion chamber 7 heats the air required for the secondary combustion chamber 8 to raise the temperature, and raises the temperature of the combustion products formed in the secondary combustion chamber 8 by the fuel, which is the same fuel as the high-grade fuel charged into the secondary combustion chamber 8 for the low-grade fuel.
The specific implementation mode is as follows:
it is to be noted that, in the description of the structure and the flow, the repetition is not necessary; obvious flow is not described. The invention is described in detail below with reference to the figures and examples.
The dual fuel gas-steam combined cycle power plant shown in fig. 1 is implemented as follows:
(1) Structurally, the device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary combustion chamber and a secondary combustion chamber; a low-grade fuel channel is arranged outside and communicated with the primary section combustion chamber 7, a high-grade fuel channel is also arranged outside and communicated with the secondary section combustion chamber 8, an air channel is also arranged outside and communicated with the primary section combustion chamber 7 through a compressor 5, the primary section combustion chamber 7 is also provided with a primary section fuel gas channel and communicated with the secondary section combustion chamber 8, and the secondary section combustion chamber 8 is also provided with a fuel gas channel and communicated with the outside through a gas turbine 6 and a high-temperature heat exchanger 3; after a condensate pipeline of the condenser 4 is communicated with the high-temperature heat exchanger 3 through the booster pump 2, a steam channel of the high-temperature heat exchanger 3 is communicated with the steam turbine 1, and a low-pressure steam channel of the steam turbine 1 is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) In the flow, external air flows through the compressor 5, is boosted and heated, then enters the primary combustion chamber 7, external low-grade fuel enters the primary combustion chamber 7, and the low-grade fuel and the air are mixed and combusted in the primary combustion chamber 7 to form primary fuel gas which is high in temperature and rich in air, and then the primary fuel gas is supplied to the secondary combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from the primary section combustion chamber 7 and is combusted into high-temperature high-pressure gas, and the high-temperature high-pressure gas generated by the secondary combustion chamber 8 flows through a gas turbine 6 to perform decompression work and flows through a high-temperature heat exchanger 3 to release heat and reduce the temperature and is discharged outwards; the condensate of the condenser 4 is boosted by the booster pump 2, and then is absorbed by the high-temperature heat exchanger 3 to absorb heat, raise temperature, vaporize and overheat, and then enters the steam turbine 1 to reduce pressure and do work, and the low-pressure steam discharged by the steam turbine 1 enters the condenser 4 to release heat and condense; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the primary section combustion chamber 7 and the secondary section combustion chamber 8, the cooling medium takes away the low-temperature heat load through the condenser 4, and the air and the fuel gas take away the low-temperature heat load through the inlet and outlet flow; the work output by the steam turbine 1 and the gas turbine 6 is provided for the compressor 5 and external actuating power, or the work output by the steam turbine 1 and the gas turbine 6 is provided for the booster pump 2, the compressor 5 and external actuating power, so that a dual-fuel gas-steam combined cycle power device is formed.
The dual fuel gas-steam combined cycle power plant shown in fig. 2 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; a low-grade fuel channel is arranged outside and communicated with the primary section combustion chamber 7, a high-grade fuel channel is also arranged outside and communicated with the secondary section combustion chamber 8, an air channel is also arranged outside and communicated with the primary section combustion chamber 7 through a compressor 5 and a high-temperature heat regenerator 9, the primary section combustion chamber 7 is also provided with a primary section gas channel and communicated with the secondary section combustion chamber 8, and the secondary section combustion chamber 8 is also provided with a gas channel and communicated with the outside through a gas turbine 6, the high-temperature heat regenerator 9 and a high-temperature heat exchanger 3; after a condensate pipeline of the condenser 4 is communicated with the high-temperature heat exchanger 3 through the booster pump 2, a steam channel of the high-temperature heat exchanger 3 is communicated with the steam turbine 1, and a low-pressure steam channel of the steam turbine 1 is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: external air flows through the compressor 5 to be boosted and heated and flows through the high-temperature heat regenerator 9 to absorb heat and be heated, then enters the primary combustion chamber 7, external low-grade fuel enters the primary combustion chamber 7, and the low-grade fuel and the air are mixed and combusted in the primary combustion chamber 7 to be primary fuel gas which is high in temperature and rich in air, and then the primary fuel gas is supplied to the secondary combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from the primary section combustion chamber 7 and is combusted into high-temperature high-pressure gas, and the high-temperature high-pressure gas generated by the secondary combustion chamber 8 flows through a gas turbine 6 to reduce the pressure and do work; the gas discharged by the gas turbine 6 flows through the high-temperature heat regenerator 9 and the high-temperature heat exchanger 3 to gradually release heat and reduce temperature, and then is discharged outwards to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 3 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the primary section combustion chamber 7, the external part is also provided with a high-grade fuel channel which is communicated with the secondary section combustion chamber 8, the external part is also provided with an air channel which is communicated with the primary section combustion chamber 7 through a compressor 5, the primary section combustion chamber 7 is also provided with a primary section fuel gas channel which is communicated with the secondary section combustion chamber 8 through a high-temperature heat regenerator 9, and the secondary section combustion chamber 8 is also provided with a fuel gas channel which is communicated with the external part through a gas turbine 6, the high-temperature heat regenerator 9 and the high-temperature heat exchanger 3; after a condensate pipeline of the condenser 4 is communicated with the high-temperature heat exchanger 3 through the booster pump 2, a steam channel of the high-temperature heat exchanger 3 is communicated with the steam turbine 1, and a low-pressure steam channel of the steam turbine 1 is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: external air flows through the compressor 5, is boosted and heated, then enters the primary combustion chamber 7, external low-grade fuel enters the primary combustion chamber 7, the low-grade fuel and the air are mixed and combusted in the primary combustion chamber 7 to be primary fuel gas which is high in temperature and rich in air, the primary fuel gas flows through the high-temperature heat regenerator 9 to absorb heat and be heated, and then the primary fuel gas is supplied to the secondary combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section fuel gas from the primary section combustion chamber 7 and is combusted into high-temperature high-pressure fuel gas; the high-temperature and high-pressure gas generated by the second-stage combustion chamber 8 flows through the gas turbine 6 to reduce pressure and do work, flows through the high-temperature heat regenerator 9 and the high-temperature heat exchanger 3 to gradually release heat and reduce temperature, and is then discharged outwards to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 4 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber 7, the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber 8, the external part is also provided with an air channel which is communicated with a compressor 5, then the compressor 5 is also provided with an air channel which is communicated with the compressor by a high-temperature heat regenerator 9, the compressor 5 is also provided with an air channel which is communicated with the primary section combustion chamber 7, the primary section combustion chamber 7 is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber 8, and the secondary section combustion chamber 8 is also provided with a gas channel which is communicated with the external part by a gas turbine 6, the high-temperature heat regenerator 9 and a high-temperature heat exchanger 3; after a condensate pipeline of the condenser 4 is communicated with the high-temperature heat exchanger 3 through the booster pump 2, a steam channel of the high-temperature heat exchanger 3 is communicated with the steam turbine 1, and a low-pressure steam channel of the steam turbine 1 is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the external air enters the compressor 5 to be boosted and heated to a certain degree, then flows through the high-temperature heat regenerator 9 to absorb heat and be heated, and then enters the compressor 5 to be boosted and heated continuously; air discharged by the compressor 5 enters the primary section combustion chamber 7, external low-grade fuel enters the primary section combustion chamber 7, and the low-grade fuel and the air are mixed and combusted in the primary section combustion chamber 7 to form primary section fuel gas which is high in temperature and rich in air, and then the primary section fuel gas is supplied to the secondary section combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from the primary section combustion chamber 7 and is combusted into high-temperature high-pressure gas, and the high-temperature high-pressure gas generated by the secondary combustion chamber 8 enters a gas turbine 6 to reduce the pressure and do work; the gas discharged by the gas turbine 6 flows through the high-temperature heat regenerator 9 and the high-temperature heat exchanger 3 to gradually release heat and reduce temperature, and then is discharged outwards to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 5 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber 7, the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber 8, the external part is also provided with an air channel which is communicated with the primary section combustion chamber 7 through a compressor 5 and a high-temperature heat regenerator 9, the primary section combustion chamber 7 is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber 8, the secondary section combustion chamber 8 is also provided with a gas channel which is communicated with a gas turbine 6, then the gas turbine 6 is also provided with a gas channel which is communicated with the self through the high-temperature heat regenerator 9, and the gas turbine 6 is also provided with a gas channel which is communicated with the external part through a high-temperature heat exchanger 3; the condenser 4 is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger 3 through the booster pump 2, then the high-temperature heat exchanger 3 is provided with a steam channel which is communicated with the steam turbine 1, and the steam turbine 1 is also provided with a low-pressure steam channel which is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the external air flows through the compressor 5 to be boosted and heated, flows through the high-temperature heat regenerator 9 to absorb heat and be heated, and then enters the primary combustion chamber 7; the external low-grade fuel enters the primary combustion chamber 7, the low-grade fuel and air are mixed and combusted in the primary combustion chamber 7 to form primary fuel gas which is high in temperature and rich in air, and then the primary fuel gas is supplied to the secondary combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from a primary section combustion chamber 7 and is combusted into high-temperature high-pressure gas, the high-temperature high-pressure gas generated by the secondary combustion chamber 8 enters a gas turbine 6 to perform pressure reduction work to a certain degree, then flows through a high-temperature heat regenerator 9 to release heat and reduce temperature, and then enters the gas turbine 6 to continue to perform pressure reduction work; and the gas discharged by the gas turbine 6 is discharged through the high-temperature heat exchanger 3 to release heat and reduce temperature, and then is discharged to the outside to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 6 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber 7, the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber 8, the external part is also provided with an air channel which is communicated with the primary section combustion chamber 7 through a compressor 5, the primary section combustion chamber 7 is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber 8 through a high-temperature heat regenerator 9, the secondary section combustion chamber 8 is also provided with a gas channel which is communicated with a gas turbine 6, then the gas turbine 6 is provided with a gas channel which is communicated with the self through the high-temperature heat regenerator 9, and the gas turbine 6 is also provided with a gas channel which is communicated with the external part through a high-temperature heat exchanger 3; after a condensate pipeline of the condenser 4 is communicated with the high-temperature heat exchanger 3 through the booster pump 2, a steam channel of the high-temperature heat exchanger 3 is communicated with the steam turbine 1, and a low-pressure steam channel of the steam turbine 1 is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: external air flows through the compressor 5, is boosted and heated, then enters the primary combustion chamber 7, external low-grade fuel enters the primary combustion chamber 7, the low-grade fuel and the air are mixed and combusted in the primary combustion chamber 7 to be primary fuel gas which is high in temperature and rich in air, and the primary fuel gas flows through the high-temperature heat regenerator 9 to absorb heat and be heated and then is supplied to the secondary combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from the primary section combustion chamber 7 and is combusted into high-temperature and high-pressure gas, the high-temperature and high-pressure gas generated by the secondary combustion chamber 8 enters a gas turbine 6 to perform depressurization and work to a certain degree, then flows through a high-temperature heat regenerator 9 to release heat and reduce temperature, and then enters the gas turbine 6 to perform depressurization and work continuously; the gas discharged by the gas turbine 6 passes through the high-temperature heat exchanger 3 to release heat and reduce temperature, and then is discharged outwards, so that a dual-fuel gas-steam combined cycle power device is formed.
The dual fuel gas-steam combined cycle power plant shown in fig. 7 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber 7, the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber 8, the external part is also provided with an air channel which is communicated with a compressor 5, then the compressor 5 is further provided with an air channel which is communicated with the primary section combustion chamber 7 through a high-temperature heat regenerator 9, the primary section combustion chamber 7 is also provided with a primary section gas channel which is communicated with a secondary section combustion chamber 8, the secondary section combustion chamber 8 is also provided with a gas channel which is communicated with a gas turbine 6, then the gas turbine 6 is further provided with a gas channel which is communicated with the primary section combustion chamber through the high-temperature heat regenerator 9, and the gas turbine 6 is also provided with a gas channel which is communicated with the external part through a high-temperature heat exchanger 3; the condenser 4 is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger 3 through the booster pump 2, then the high-temperature heat exchanger 3 is provided with a steam channel which is communicated with the steam turbine 1, and the steam turbine 1 is also provided with a low-pressure steam channel which is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the gas turbine 6 is connected with the compressor 5 and transmits power.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the external air enters the compressor 5 to be boosted and heated to a certain degree, then flows through the high-temperature heat regenerator 9 to absorb heat and be heated, and then enters the compressor 5 to be boosted and heated continuously; air discharged by the compressor 5 enters the primary section combustion chamber 7, external low-grade fuel enters the primary section combustion chamber 7, and the low-grade fuel and the air are mixed and combusted in the primary section combustion chamber 7 to form primary section fuel gas which is high in temperature and rich in air, and then the primary section fuel gas is supplied to the secondary section combustion chamber 8; the external high-grade fuel enters a secondary combustion chamber 8, is mixed with the primary section gas from a primary section combustion chamber 7 and is combusted into high-temperature high-pressure gas, the high-temperature high-pressure gas generated by the secondary combustion chamber 8 enters a gas turbine 6 to perform pressure reduction work to a certain degree, then flows through a high-temperature heat regenerator 9 to release heat and reduce temperature, and then enters the gas turbine 6 to continue to perform pressure reduction work; and the gas discharged by the gas turbine 6 is discharged through the high-temperature heat exchanger 3 to release heat and reduce temperature, and then is discharged to the outside to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 8 is implemented as follows:
(1) Structurally, in the dual fuel gas-steam combined cycle power plant shown in fig. 1, the high heat exchanger 3 having the steam passage communicating with the steam turbine 1 is adjusted such that the high heat exchanger 3 having the steam passage communicating with the steam turbine 1 via the primary combustion chamber 7.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the steam discharged by the high-temperature heat exchanger 3 flows through the primary section combustion chamber 7 to absorb heat and raise temperature, and then enters the steam turbine 1 to reduce pressure and do work, so that the dual-fuel gas-steam combined cycle power device is formed.
The dual fuel gas-steam combined cycle power plant shown in fig. 9 is implemented as follows:
(1) Structurally, in the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the connection between the steam channel of the high heat exchanger 3 and the steam turbine 1 is adjusted so that the steam channel of the steam turbine 1 is connected to the high heat exchanger 3 and the steam turbine 1, and then the steam channel of the steam turbine 1 is connected to the dual-fuel gas-steam combined cycle power plant through the primary combustion chamber 7.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the steam discharged by the high-temperature heat exchanger 3 enters the steam turbine 1, is decompressed and does work to a certain degree, then flows through the primary section combustion chamber 7 to absorb heat and raise temperature, and then enters the steam turbine 1 to be decompressed and does work continuously to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 10 is implemented as follows:
(1) Structurally, in the dual-fuel gas-steam combined cycle power plant shown in fig. 1, a second booster pump and a low-temperature heat regenerator are added, the condenser 4 is adjusted to be communicated with the booster pump 2 through a condensate pipeline, the condenser 4 is adjusted to be communicated with the low-temperature heat regenerator 11 through a condensate pipeline of the second booster pump 10, the steam turbine 1 is provided with a steam extraction channel to be communicated with the low-temperature heat regenerator 11, and the low-temperature heat regenerator 11 is communicated with the booster pump 2 through a condensate pipeline.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the condensate discharged by the condenser 4 flows through the second booster pump 10 to be boosted and then enters the low-temperature heat regenerator 11 to be mixed with the extracted steam from the steam turbine 1, absorb heat and raise temperature, and the extracted steam releases heat to form condensate; the condensate of the low-temperature heat regenerator 11 flows through the booster pump 2 to be boosted, flows through the high-temperature heat exchanger 3 to absorb heat, raise temperature, vaporize and overheat, and then enters the steam turbine 1 to be decompressed and work; the steam entering the steam turbine 1 is decompressed and does work to a certain degree and then is divided into two paths, the first path is provided for the low-temperature heat regenerator 11, and the second path continues to be decompressed and does work and then enters the condenser 4 to release heat and condense to form the dual-fuel gas-steam combined cycle power device.
The dual fuel gas-steam combined cycle power plant shown in fig. 11 is implemented as follows:
(1) Structurally, in the dual-fuel gas-steam combined cycle power plant shown in fig. 1, an expansion speed increaser 12 is added to replace the steam turbine 1, and a diffuser pipe 13 is added to replace the booster pump 2.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 1, the difference in the flow is that: the condensate of the condenser 4 flows through the diffuser pipe 13 to reduce the speed and increase the pressure, flows through the high-temperature heat exchanger 3 to absorb heat, raise the temperature, vaporize and overheat, flows through the expansion speed increasing machine 12 to reduce the pressure, work and increase the speed, and then enters the condenser 4 to release heat and condense; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the air heating furnace 7 and the combustion chamber 8, the cooling medium takes away the low-temperature heat load through the condenser 4, and the air and the fuel gas take away the low-temperature heat load through the inlet and outlet flow; the work output by the gas turbine 6 and the expansion speed increaser 12 is supplied to the compressor 5 and external power to form a dual-fuel gas-steam combined cycle power plant.
The dual fuel gas-steam combined cycle power plant shown in fig. 12 is implemented as follows:
(1) Structurally, in the dual-fuel gas-steam combined cycle power plant shown in fig. 10, an expansion speed-increasing machine 12 is added in place of the steam turbine 1, a diffuser 13 is added in place of the booster pump 2, and a second diffuser 14 is added in place of the second booster pump 10.
(2) Compared with the dual-fuel gas-steam combined cycle power plant shown in fig. 10, the difference in the flow is that: the condensate discharged by the condenser 4 flows through a second diffuser pipe 14, is subjected to speed reduction and pressure increase, then enters a low-temperature heat regenerator 11, is mixed with the extracted steam from an expansion speed increaser 12, absorbs heat, is heated, and releases heat to form condensate after the extracted steam is extracted; the condensate of the low-temperature heat regenerator 11 flows through the diffuser pipe 13 to reduce the speed and increase the pressure, flows through the high-temperature heat exchanger 3 to absorb heat, raise the temperature, vaporize and overheat, and then enters the expansion speed increaser 12 to reduce the pressure, do work and increase the speed; the steam entering the expansion speed increaser 12 reduces the pressure and does work to a certain degree, and then is divided into two paths, the first path is provided for the low-temperature heat regenerator 11, the second path continues to reduce the pressure and do work and increase the speed, and then enters the condenser 4 to release heat and condense, so that the dual-fuel gas-steam combined cycle power device is formed.
The effect that the technology of the invention can realize-the dual-fuel gas-steam combined cycle power device provided by the invention has the following effects and advantages:
(1) The low-grade fuel and the high-grade fuel are reasonably matched, a high-temperature heat source is jointly built, and the fuel cost is effectively reduced.
(2) The high-temperature thermal load is utilized in a grading manner, so that the irreversible loss of temperature difference is obviously reduced, and the thermal power change efficiency is effectively improved.
(3) The low-grade fuel completes the temperature increase of compressed air and provides for high-grade fuel, and the irreversible loss of temperature difference in the combustion process of the high-grade fuel is effectively reduced.
(4) The low-grade fuel combines the high-grade fuel to provide high-temperature driving heat load for the dual-fuel gas-steam combined cycle power device, the low-grade fuel exerts the effect of the high-grade fuel, and the utilization value of converting the low-grade fuel into mechanical energy is greatly improved.
(5) The low-grade fuel can be used for or is beneficial to reducing the compression ratio of a circulating system of the top gas turbine, improving the flow of gas circulating working medium and increasing the load of a power plant.
(6) The investment of high-grade fuel is directly reduced, and the effect is equal to the improvement of the utilization rate of the high-grade fuel converted into mechanical energy.
(7) When the low-grade fuel is independently utilized, the grade of high-temperature fuel gas can be obviously improved, and the utilization value of the low-grade fuel is improved.
(8) The fuel selection range and the use value are improved, and the energy consumption cost of the device is reduced.
(9) The utilization value of the fuel is improved, the emission of greenhouse gases and pollutants is reduced, and the energy-saving and emission-reducing benefits are remarkable.
(10) The device has the advantages of simple structure, reasonable flow, rich scheme and contribution to reducing the manufacturing cost of the device and expanding the technical application range.

Claims (12)

1. The double-fuel gas-steam combined cycle power plant mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber and a second-stage combustion chamber; a low-grade fuel channel is arranged outside and communicated with the primary section combustion chamber (7), a high-grade fuel channel is arranged outside and communicated with the secondary section combustion chamber (8), an air channel is arranged outside and communicated with the primary section combustion chamber (7) through a compressor (5), a primary section gas channel is also arranged in the primary section combustion chamber (7) and communicated with the secondary section combustion chamber (8), and a gas channel is also arranged in the secondary section combustion chamber (8) and communicated with the outside through a gas turbine (6) and a high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
2. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber, a second-stage combustion chamber and a high-temperature heat regenerator; a low-grade fuel channel is arranged outside and communicated with a primary section combustion chamber (7), a high-grade fuel channel is arranged outside and communicated with a secondary section combustion chamber (8), an air channel is arranged outside and communicated with the primary section combustion chamber (7) through a compressor (5) and a high-temperature heat regenerator (9), the primary section combustion chamber (7) is also provided with a primary section gas channel communicated with the secondary section combustion chamber (8), and the secondary section combustion chamber (8) is also provided with a gas channel communicated with the outside through a gas turbine (6), the high-temperature heat regenerator (9) and a high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
3. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber, a second-stage combustion chamber and a high-temperature heat regenerator; a low-grade fuel channel is arranged outside and communicated with the primary section combustion chamber (7), a high-grade fuel channel is arranged outside and communicated with the secondary section combustion chamber (8), an air channel is arranged outside and communicated with the primary section combustion chamber (7) through a compressor (5), the primary section combustion chamber (7) and a primary section gas channel are communicated with the secondary section combustion chamber (8) through a high-temperature heat regenerator (9), and the secondary section combustion chamber (8) and a gas channel are communicated with the outside through a gas turbine (6), a high-temperature heat regenerator (9) and a high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
4. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the primary section combustion chamber (7), the external part is also provided with a high-grade fuel channel which is communicated with the secondary section combustion chamber (8), the external part is also provided with an air channel which is communicated with the compressor (5), then the compressor (5) is provided with an air channel which is communicated with the compressor through a high-temperature heat regenerator (9), the compressor (5) is also provided with an air channel which is communicated with the primary section combustion chamber (7), the primary section combustion chamber (7) is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber (8), and the secondary section combustion chamber (8) is also provided with a gas channel which is communicated with the external part through a gas turbine (6), a high-temperature heat regenerator (9) and a high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
5. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber, a second-stage combustion chamber and a high-temperature heat regenerator; a low-grade fuel channel is arranged outside and communicated with a primary section combustion chamber (7), a high-grade fuel channel is arranged outside and communicated with a secondary section combustion chamber (8), an air channel is arranged outside and communicated with the primary section combustion chamber (7) through a compressor (5) and a high-temperature heat regenerator (9), a primary section gas channel is also arranged in the primary section combustion chamber (7) and communicated with the secondary section combustion chamber (8), a gas channel is also arranged in the secondary section combustion chamber (8) and communicated with a gas turbine (6), then the gas turbine (6) is communicated with the gas turbine through the high-temperature heat regenerator (9), and the gas turbine (6) is also provided with a gas channel which is communicated with the outside through the high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
6. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a first-stage combustion chamber, a second-stage combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber (7), the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber (8), the external part is also provided with an air channel which is communicated with the primary section combustion chamber (7) through a compressor (5), the primary section combustion chamber (7) is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber (8) through a high-temperature heat regenerator (9), the secondary section combustion chamber (8) is also provided with a gas channel which is communicated with a gas turbine (6), then the gas turbine (6) is also provided with a gas channel which is communicated with the external part through the high-temperature heat regenerator (9), and the gas turbine (6) is also provided with a gas channel which is communicated with the external part through a high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
7. A dual-fuel gas-steam combined cycle power device mainly comprises a steam turbine, a booster pump, a high-temperature heat exchanger, a condenser, a compressor, a gas turbine, a primary section combustion chamber, a secondary section combustion chamber and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with a primary section combustion chamber (7), the external part is also provided with a high-grade fuel channel which is communicated with a secondary section combustion chamber (8), the external part is also provided with an air channel which is communicated with a compressor (5), then the compressor (5) is further provided with an air channel which is communicated with the primary section combustion chamber (7) through a high-temperature heat regenerator (9), the primary section combustion chamber (7) is also provided with a primary section gas channel which is communicated with the secondary section combustion chamber (8), the secondary section combustion chamber (8) is also provided with a gas channel which is communicated with a gas turbine (6), then the gas turbine (6) is further provided with a gas channel which is communicated with the external part through the high-temperature heat regenerator (9), and the gas turbine (6) is also provided with a gas channel which is communicated with the external part through the high-temperature heat exchanger (3); the condenser (4) is provided with a condensate pipeline which is communicated with the high-temperature heat exchanger (3) through the booster pump (2), then the high-temperature heat exchanger (3) is communicated with the steam turbine (1) through a steam channel, and the steam turbine (1) is also communicated with the condenser (4) through a low-pressure steam channel; the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the gas turbine (6) is connected with the compressor (5) and transmits power to form a dual-fuel gas-steam combined cycle power device.
8. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices disclosed in claims 1-7, a high heat exchanger (3) is communicated with a steam turbine (1) through a steam channel, and the high heat exchanger (3) is communicated with the steam turbine (1) through a primary combustion chamber (7) through the steam channel, so that the dual-fuel gas-steam combined cycle power device is formed.
9. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices of claims 1 to 7, a high heat exchanger (3) is communicated with a steam turbine (1) through a steam channel, and is adjusted to be in a state that the high heat exchanger (3) is communicated with the steam turbine (1) through the steam channel, and then the steam turbine (1) is communicated with the power device through a primary combustion chamber (7) through the steam channel, so that the dual-fuel gas-steam combined cycle power device is formed.
10. A dual-fuel gas-steam combined cycle power device is characterized in that a second booster pump and a low-temperature heat regenerator are added in any one dual-fuel gas-steam combined cycle power device of claims 1-9, a condenser (4) is communicated with a booster pump (2) through a condensate pipeline, the condenser (4) is adjusted to be communicated with the low-temperature heat regenerator (11) through a second booster pump (10), a steam turbine (1) is provided with a steam extraction channel to be communicated with the low-temperature heat regenerator (11), and the low-temperature heat regenerator (11) is further communicated with the booster pump (2) through the condensate pipeline to form the dual-fuel gas-steam combined cycle power device.
11. A dual-fuel gas-steam combined cycle power device is characterized in that in any one of the dual-fuel gas-steam combined cycle power devices disclosed by claims 1-9, an expansion speed increaser (12) is added to replace a steam turbine (1), a diffuser pipe (13) is added to replace a booster pump (2), and the dual-fuel gas-steam combined cycle power device is formed.
12. A dual-fuel gas-steam combined cycle power device is characterized in that in any one dual-fuel gas-steam combined cycle power device in claim 10, an expansion speed increaser (12) is added to replace a steam turbine (1), a diffuser pipe (13) is added to replace a booster pump (2), and a second diffuser pipe (14) is added to replace a second booster pump (10), so that the dual-fuel gas-steam combined cycle power device is formed.
CN202210063089.0A 2021-01-11 2022-01-10 Dual-fuel gas-steam combined cycle power device Pending CN115199366A (en)

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CN2021100736231 2021-01-11

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