CN115217556A - Dual-fuel combined cycle steam power device - Google Patents

Dual-fuel combined cycle steam power device Download PDF

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Publication number
CN115217556A
CN115217556A CN202210119600.4A CN202210119600A CN115217556A CN 115217556 A CN115217556 A CN 115217556A CN 202210119600 A CN202210119600 A CN 202210119600A CN 115217556 A CN115217556 A CN 115217556A
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China
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communicated
heating furnace
steam
channel
dual
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CN202210119600.4A
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Chinese (zh)
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李鸿瑞
李华玉
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Individual
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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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01B23/08—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
    • 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
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • 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
    • 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
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/24—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by separately-fired heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention provides a dual-fuel combined cycle steam power device, belonging to the technical field of thermodynamics and thermodynamics. The external part is provided with a low-grade fuel channel which is communicated with the heating furnace, the external part is also provided with an air channel which is communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator; the outside of the first heating furnace is also provided with a high-grade fuel channel communicated with a second heating furnace, the outside of the first heating furnace is also provided with an air channel communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel communicated with the outside through the second heat source heat regenerator; the condenser is communicated with the second heating furnace through a booster pump, the evaporator and the heating furnace, the compressor is communicated with the second heating furnace through the heating furnace, the second heating furnace is also 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 respectively communicated with the compressor and the condenser through the evaporator; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form the dual-fuel combined cycle steam power device.

Description

Dual-fuel combined cycle steam 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 fuel into thermal energy by combustion and the conversion of thermal energy into mechanical energy by a 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 is closely related to the heat power conversion efficiency; from the view of the temperature of fuel gas formed by combustion (such as constant-pressure combustion temperature), the high-grade fuel with high constant-pressure combustion temperature has high temperature of combustion products, and can be independently used as a high-temperature heat source capable of meeting high-efficiency power circulation to convert more mechanical energy; and low-grade fuel with low constant pressure combustion temperature is difficult to form high-temperature combustion products and to be a high-temperature heat source capable of meeting high-efficiency power circulation independently, and the converted mechanical energy is relatively less.
Due to the limitations of the operating principle, the nature of the working medium, the material nature, the manufacturing level of the compression equipment and other components, and the like, in the existing steam power plant adopting high-grade fuel, part of the combustion heat is supplied to the low-temperature section of the heat source in the process of utilizing the high-temperature heat source formed by the high-grade fuel, which causes the quality loss in fuel utilization, and provides an opportunity for the low-grade fuel to participate in constructing the heat source.
The invention provides a dual-fuel combined cycle steam power device which can reasonably match low-grade fuel and high-grade fuel to jointly build a heat source, realize the complementation of advantages and shortages and the complementation of advantages, greatly improve the heat power-changing efficiency of the low-grade fuel, reduce the emission of greenhouse gases and effectively reduce the fuel cost.
The invention content is as follows:
the invention mainly aims to provide a dual-fuel combined cycle steam power device, and the specific contents are set forth in the following sections:
1. the dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the external part of the heating furnace is provided with a low-grade fuel channel communicated with the heating furnace, the external part of the heating furnace is also provided with an air channel communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the first heating furnace is also provided with a high-grade fuel channel communicated with a second heating furnace, the outside of the first heating furnace is also provided with an air channel communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline, a booster pump is communicated with the evaporator, then a steam channel of the evaporator is communicated with a second heating furnace through a heating furnace, a steam channel of the compressor is communicated with the second heating furnace through the heating furnace, a steam channel of the second heating furnace is communicated with a steam turbine, and the steam turbine is also provided with a low-pressure steam channel which is communicated with the evaporator and then divided into two paths, namely a first path is communicated with the compressor and a second path is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
2. The dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace, the external part is also provided with an air channel which is communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator; the outside of the second heating furnace is also provided with a high-grade fuel channel which is communicated with the second heating furnace, the outside of the second heating furnace is also provided with an air channel which is communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline, the condenser is communicated with the evaporator through a booster pump, then a steam channel of the evaporator is communicated with a second heating furnace through a high-temperature heat regenerator and a heating furnace, a compressor is provided with a steam channel, the high-temperature heat regenerator and the heating furnace are communicated with the second heating furnace, the second heating furnace is also provided with a steam channel communicated with a steam turbine, the steam turbine is also provided with a low-pressure steam channel, the low-pressure steam channel is divided into two paths after the high-temperature heat regenerator is communicated with the evaporator, the first path is communicated with the compressor, and the second path is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
3. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace, the external part is also provided with an air channel which is communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator; the outside of the first heating furnace is also provided with a high-grade fuel channel communicated with a second heating furnace, the outside of the first heating furnace is also provided with an air channel communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline, a booster pump is communicated with the evaporator, then a steam channel of the evaporator is communicated with the second heating furnace through a high-temperature heat regenerator and a heating furnace, a steam channel of the compressor is communicated with the second heating furnace through the high-temperature heat regenerator and the heating furnace, the steam channel of the second heating furnace is also communicated with a steam turbine, then the steam channel of the steam turbine is communicated with the steam turbine, then the steam turbine is further provided with a steam channel which is communicated with the steam turbine, and then the steam channel of the steam turbine is divided into two paths, namely a first path is communicated with the compressor and a second path is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
4. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a heat supplier; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace, the external part is also provided with an air channel which is communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator; the outside of the first heating furnace is also provided with a high-grade fuel channel communicated with a second heating furnace, the outside of the first heating furnace is also provided with an air channel communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline which is communicated with the heating furnace through a booster pump, then a steam channel of the heating furnace is communicated with a second heating furnace, a steam channel of the compressor is communicated with the second heating furnace, a steam channel of the second heating furnace is communicated with a steam turbine, and the steam turbine is also divided into two paths after being communicated with a heat supply device, wherein the first path is communicated with the compressor and the second path is communicated with the condenser; the condenser is also provided with a cooling medium channel communicated with the outside, the heater is also provided with a heated medium channel communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
5. The dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the external part of the heating furnace is provided with a low-grade fuel channel communicated with the heating furnace, the external part of the heating furnace is also provided with an air channel communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the second heating furnace is also provided with a high-grade fuel channel which is communicated with the second heating furnace, the outside of the second heating furnace is also provided with an air channel which is communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline, the evaporator is further provided with a steam channel to be communicated with the heating furnace after the condensate pipeline is communicated with the evaporator through the booster pump, the heating furnace is also provided with a steam channel to be communicated with the steam turbine through an intermediate port, the compressor is provided with a steam channel to be communicated with the second heating furnace through the heating furnace, the second heating furnace is also provided with a steam channel to be communicated with the steam turbine, and the steam turbine is also provided with a low-pressure steam channel to be communicated with the evaporator and then divided into two paths, namely a first path is communicated with the compressor and a second path is communicated with the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
6. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a second steam turbine; the external part of the heating furnace is provided with a low-grade fuel channel communicated with the heating furnace, the external part of the heating furnace is also provided with an air channel communicated with the heating furnace through a heat source heat regenerator, and the heating furnace is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the first heating furnace is also provided with a high-grade fuel channel communicated with a second heating furnace, the outside of the first heating furnace is also provided with an air channel communicated with the second heating furnace through a second heat source heat regenerator, and the second heating furnace is also provided with a fuel gas channel communicated with the outside through the second heat source heat regenerator; the condenser is provided with a condensate pipeline, the evaporator is communicated with a second steam turbine through a steam channel after the condensate pipeline is communicated with the evaporator through a booster pump, the second steam turbine is also provided with a low-pressure steam channel to be communicated with the evaporator, the compressor is provided with a steam channel to be communicated with a second heating furnace through a heating furnace, the second heating furnace is also provided with a steam channel to be communicated with the steam turbine, the steam turbine is also provided with a low-pressure steam channel to be communicated with the evaporator, and the evaporator is also provided with a low-pressure steam channel to be respectively communicated with the compressor and the condenser; the condenser is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine is connected with the compressor and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine connects the compressor and the booster pump and transmits power.
7. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in items 1-6, a second heating furnace is provided with a steam passage to be communicated with a steam turbine, the communication between the second heating furnace and the steam turbine is adjusted to be that after the second heating furnace is provided with the steam passage to be communicated with the steam turbine, the steam turbine is also provided with a reheating steam passage to be communicated with the steam turbine through a heating furnace, and the dual-fuel combined cycle steam power device is formed.
8. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in items 1-6, a second heating furnace is provided with a steam passage to be communicated with a steam turbine, the steam turbine is provided with a reheat steam passage to be communicated with the steam turbine through the second heating furnace after the second heating furnace is provided with the steam passage to be communicated with the steam turbine, and the dual-fuel combined cycle steam power device is formed.
9. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in items 1-6, a second heating furnace is provided with a steam passage to be communicated with a steam turbine, the steam turbine is provided with a reheat steam passage to be communicated with the steam turbine after the second heating furnace is provided with the steam passage to be communicated with the steam turbine, and the steam turbine is also provided with the reheat steam passage to be communicated with the steam turbine through the heating furnace and the second heating furnace, so that the dual-fuel combined cycle steam power device is formed.
10. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices 1-9, an expansion speed increaser is added to replace a steam turbine, a dual-energy compressor is added to replace a compressor, a diffuser pipe is added to replace a booster pump, and the dual-fuel combined cycle steam power device is formed.
11. A dual-fuel combined cycle steam power device is characterized in that a low-temperature heat regenerator and a second booster pump are added in any one of the dual-fuel combined cycle steam power devices in items 1-9, a condenser with a condensate pipeline communicated with the booster pump is adjusted to be communicated with a low-temperature heat regenerator through the second booster pump, a compressor is additionally provided with a steam extraction channel 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 combined cycle steam power device is formed.
12. A dual-fuel combined cycle steam power device, which is characterized in that in any one of the dual-fuel combined cycle steam power devices in the item 11, an expansion speed increaser is added to replace a steam turbine, a dual-energy compressor is added to replace a compressor, 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 combined cycle steam power device is formed.
13. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in items 1 to 12, a second heat source heat regenerator is cancelled, an external air channel is communicated with a heating furnace through the heat source heat regenerator, and the external air channel is communicated with a second heating furnace through the second heat source heat regenerator, and the adjustment is that the external air channel is communicated with the heat source heat regenerator and then divided into two paths, namely, the first path is communicated with the heating furnace, and the second path is communicated with the second heating furnace; and adjusting the communication between the fuel gas channel of the second heating furnace and the outside through a second heat source heat regenerator to the communication between the fuel gas channel of the second heating furnace and the outside through the heat source heat regenerator to form the dual-fuel combined cycle steam power device.
Description of the drawings:
FIG. 1 is a schematic thermodynamic system diagram of a dual fuel combined cycle steam power plant 1 provided in accordance with the present invention.
FIG. 2 is a schematic thermodynamic system diagram of a dual fuel combined cycle steam power plant of type 2 provided in accordance with the present invention.
FIG. 3 is a schematic thermodynamic system diagram of a dual fuel combined cycle steam power plant of type 3 provided in accordance with the present invention.
FIG. 4 is a diagram of a 4 th principle thermodynamic system of a dual fuel combined cycle steam 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 combined cycle steam 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 combined cycle steam power plant provided in accordance with the present invention.
FIG. 7 is a 7 th principle thermodynamic system diagram of a dual fuel combined cycle steam 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 combined cycle steam 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 combined cycle steam power plant provided in accordance with the present invention.
FIG. 10 is a diagram of a 10 th principal thermodynamic system of a dual fuel combined cycle steam power plant provided in accordance with the present invention.
FIG. 11 is a diagram of a 11 th principle thermodynamic system of a dual fuel combined cycle steam power plant provided in accordance with the present invention.
In the figure, 1-steam turbine, 2-compressor, 3-booster pump, 4-condenser, 5-evaporator, 6-heating furnace, 7-second heating furnace, 8-heat source heat regenerator, 9-second heat source heat regenerator, 10-high temperature heat regenerator, 11-heat supplier, 12-second steam turbine, 13-expansion speed increaser, 14-dual-energy compressor, 15-diffuser pipe, 16-low temperature heat regenerator, 17-second booster pump and 18-second diffuser pipe.
Regarding the expansion speed increaser, the heating furnace, the heat source regenerator, the low-grade fuel and the high-grade fuel, the following brief description is given here:
(1) In order to reveal the differences in the operational sequences of the steam turbine 1 and the expansion gear 13, the following explanations are made:
(1) in fig. 1, the steam flows through the steam turbine 1 to realize thermal work, the steam at the outlet of the steam turbine 1 has very low pressure and small flow rate (corresponding to small kinetic energy), and the mechanical energy required by the booster pump 3 can be provided by the steam turbine 1 through mechanical transmission or from the outside.
(2) In contrast, in fig. 8, the steam at the outlet of the expansion speed increaser 13 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 speed reduction and pressure increase requirements of the diffuser pipe 15, and simultaneously meet the partial pressure increase (speed reduction) requirements of the dual-energy compressor 14.
(3) The process of realizing thermal variable work by steam flowing through the steam turbine 1 in fig. 1 adopts 'pressure reduction work', and the process of realizing thermal variable work by steam flowing through the expansion speed increaser 13 in fig. 8 adopts 'pressure reduction work and speed increase'.
(2) Heating furnace and heat source regenerator:
(1) according to the requirement, a heat exchange tube bundle is arranged in the heating furnace to heat the medium flowing through the heating furnace, wherein the heat exchange tube bundle comprises a heat exchanger for raising the temperature of the medium, and an evaporator for heating and vaporizing and a reheater for reheating steam can be arranged.
(2) The particular bundle of exchanger tubes involved in heating the circulating medium flowing through the furnace is not specified, but is generally referred to as the furnace.
(3) The heat source regenerator relates to the temperature grade of fuel gas (namely a high-temperature section of a heat source) in a heating furnace, and is listed separately.
(3) Low-grade and high-grade fuels:
(1) low-grade fuel: refers to a fuel in which the highest temperature at which combustion products can form (such as adiabatic combustion temperature or fixed pressure combustion temperature) is relatively low; compared with high-quality coal, coal gangue, coal slime and the like are low-grade fuels. From the concept of heat source, low grade fuel refers to fuel whose combustion products are difficult to form a high temperature heat source of higher temperature.
(2) High-grade fuel: refers to a fuel that has a relatively high maximum temperature at which combustion products can form (e.g., adiabatic or fixed pressure combustion temperatures); compared with fuels such as coal gangue and coal slime, high-quality coal, natural gas, methane, hydrogen and the like are high-grade fuels. From the concept of heat source, a low grade fuel refers to a fuel whose combustion products can form a high temperature heat source of higher temperature.
(3) For solid fuels, the gaseous substances of the combustion products are the core of the heat source and are important components of the thermodynamic system; the solid substances in the combustion products, such as waste slag, are discharged after the heat energy contained in the combustion products is utilized (the utilization process and equipment are included in the heating furnace or air is preheated outside the heating furnace body), and the solid substances are not separately listed, and the functions of the solid substances are not separately expressed.
(4) The grade of the fuels is divided by the highest temperature formed by combustion products minus the temperature difference of indirect heat transfer, especially for the fuels which need to provide driving high-temperature heat load to the circulating working medium by indirect means; or, the temperature that the circulating working medium can reach is divided according to the temperature that the circulating working medium can reach under the existing technical conditions, namely the one with higher temperature that the circulating working medium (working medium) can reach is the high-grade fuel, and the one with lower temperature that the circulating working medium (working medium) can reach is 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 combined cycle steam power plant shown in fig. 1 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the exterior of the furnace is provided with a low-grade fuel channel communicated with the heating furnace 6, the exterior of the furnace is also provided with an air channel communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel communicated with the exterior through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 is provided with a condensate pipeline, the condenser 5 is communicated with the evaporator 5 through the booster pump 3, then a steam channel of the evaporator 5 is communicated with the second heating furnace 7 through the heating furnace 6, the compressor 2 is provided with a steam channel which is communicated with the second heating furnace 7 through the heating furnace 6, the second heating furnace 7 is also provided with a steam channel which is communicated with the steam turbine 1, the steam turbine 1 is also provided with a low-pressure steam channel which is communicated with the evaporator 5 and then divided into two paths, namely, the first path is communicated with the compressor 2 and the second path is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In the process, external low-grade fuel enters the heating furnace 6, external first path air enters the heating furnace 6 after absorbing heat and raising temperature through the heat source heat regenerator 8, the low-grade fuel and the air are mixed and combusted in the heating furnace 6 to form high-temperature fuel gas, the fuel gas in the heating furnace 6 releases heat to a circulating working medium flowing through the heating furnace and lowers the temperature, and then the fuel gas flows through the heat source heat regenerator 8 to release heat and lower the temperature and is discharged outwards; external high-grade fuel enters a second heating furnace 7, external second path air enters the second heating furnace 7 after absorbing heat and raising temperature through a second heat source heat regenerator 9, the high-grade fuel and the air are mixed and combusted in the second heating furnace 7 to form high-temperature fuel gas, the high-temperature fuel gas releases heat to a circulating working medium flowing through the high-temperature fuel gas and lowers the temperature, and then the high-temperature fuel gas releases heat and lowers the temperature and is discharged to the outside through the second heat source heat regenerator 9; the condensate of the condenser 4 is boosted by the booster pump 3, absorbed and heated and vaporized by the evaporator 5, continuously absorbed by the heating furnace 6, absorbed and heated by the second heating furnace 7, and gradually absorbed and heated by the steam discharged by the compressor 2 by the heating furnace 6 and the second heating furnace 7; the steam discharged by the second heating furnace 7 flows through the steam turbine 1 to reduce pressure and do work, the low-pressure steam discharged by the steam turbine 1 flows through the evaporator 5 to release heat and reduce temperature, and then the low-pressure steam is divided into two paths, wherein the first path enters the compressor 2 to increase pressure and temperature, and the second path 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 heating furnace 6 and the second heating furnace 7, and the cooling medium takes away the low-temperature heat load through the condenser 4; the work output by the steam turbine 1 is provided for the compressor 2 and external power, or the work output by the steam turbine 1 is provided for the compressor 2, the booster pump 3 and external power, so that a dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 2 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace 6, the external part is also provided with an air channel which is communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 has a condensate pipeline which is communicated with the evaporator 5 through the booster pump 3, then the evaporator 5 has a steam channel which is communicated with the second heating furnace 7 through the high-temperature heat regenerator 10 and the heating furnace 6, the compressor 2 has a steam channel which is communicated with the second heating furnace 7 through the high-temperature heat regenerator 10 and the heating furnace 6, the second heating furnace 7 also has a steam channel which is communicated with the steam turbine 1, the steam turbine 1 also has a low-pressure steam channel which is divided into two paths after being communicated with the evaporator 5 through the high-temperature heat regenerator 10, wherein the first path is communicated with the compressor 2, and the second path is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In the flow chart, compared with the dual fuel combined cycle steam power plant shown in fig. 1, the difference lies in that: the condensate of the condenser 4 is boosted by the booster pump 3, absorbs heat, heats and vaporizes by the evaporator 5, continuously absorbs heat by the high-temperature heat regenerator 10 and the heating furnace 6, then enters the second heating furnace 7 to absorb heat and heat, and the steam discharged by the compressor 2 gradually absorbs heat and heats by the high-temperature heat regenerator 10, the heating furnace 6 and the second heating furnace 7; the steam discharged by the second heating furnace 7 flows through the steam turbine 1 to reduce the pressure and do work, the low-pressure steam discharged by the steam turbine 1 flows through the high-temperature heat regenerator 10 and the evaporator 5 to gradually release heat and reduce the temperature, and then the low-pressure steam is divided into two paths, wherein the first path enters the compressor 2 to increase the pressure and the temperature, and the second path enters the condenser 4 to release heat and condense, so that the dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 3 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the exterior of the furnace is provided with a low-grade fuel channel communicated with the heating furnace 6, the exterior of the furnace is also provided with an air channel communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel communicated with the exterior through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 has a condensate pipeline which is communicated with the evaporator 5 through the booster pump 3, then the evaporator 5 has a steam channel which is communicated with the second heating furnace 7 through the high-temperature heat regenerator 10 and the heating furnace 6, the compressor 2 has a steam channel which is communicated with the second heating furnace 7 through the high-temperature heat regenerator 10 and the heating furnace 6, the second heating furnace 7 also has a steam channel which is communicated with the steam turbine 1, then the steam channel of the steam turbine 1 has a steam channel which is communicated with the steam turbine 1 through the high-temperature heat regenerator 10, the steam turbine 1 also has a low-pressure steam channel which is communicated with the evaporator 5 and then is divided into two paths, wherein the first path is communicated with the compressor 2 and the second path is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In flow, compared to the dual fuel combined cycle steam power plant shown in fig. 1, the difference is that: the condensate of the condenser 4 is boosted by the booster pump 3, absorbs heat, heats and vaporizes by the evaporator 5, continuously absorbs heat by the high-temperature heat regenerator 10 and the heating furnace 6, then enters the second heating furnace 7 to absorb heat and heat, and the steam discharged by the compressor 2 gradually absorbs heat and heats by the high-temperature heat regenerator 10, the heating furnace 6 and the second heating furnace 7; the steam discharged by the second heating furnace 7 enters the steam turbine 1 to reduce the pressure and do work to a certain degree, then flows through the high-temperature heat regenerator 10 to release heat and reduce the temperature, and then enters the steam turbine 1 to continue reducing the pressure and do work; the low-pressure steam discharged by the steam turbine 1 passes through the evaporator 5 to release heat and reduce temperature, and then is divided into two paths, wherein the first path enters the compressor 2 to increase the pressure and the temperature, and the second path enters the condenser 4 to release heat and condense, so that the dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 4 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a heat supplier; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace 6, the external part is also provided with an air channel which is communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 is provided with a condensate pipeline which is communicated with the heating furnace 6 through the booster pump 3, then a steam channel of the heating furnace 6 is communicated with the second heating furnace 7, a steam channel of the compressor 2 is communicated with the second heating furnace 7, the steam channel of the second heating furnace 7 is communicated with the steam turbine 1, and the steam turbine 1 is divided into two paths after a low-pressure steam channel is communicated with the heater 11, wherein the first path is communicated with the compressor 2 and the second path is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, the heat supply device 11 is also communicated with the outside through a heated medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In the flow chart, compared with the dual fuel combined cycle steam power plant shown in fig. 1, the difference lies in that: the condensate of the condenser 4 is boosted by the booster pump 3, absorbed heat, heated and vaporized by the heating furnace 6, then enters the second heating furnace 7 for absorbing heat and heating, and the steam discharged by the compressor 2 enters the second heating furnace 7 for absorbing heat and heating; the steam discharged by the second heating furnace 7 flows through the steam turbine 1 to reduce pressure and do work, the low-pressure steam discharged by the steam turbine 1 flows through the heat supplier 11 to release heat and reduce temperature, and then the low-pressure steam is divided into two paths, wherein the first path enters the compressor 2 to increase pressure and temperature, and the second path enters the condenser 4 to release heat and condense; the low-grade fuel and the high-grade fuel jointly provide high-temperature driving heat load through the heating furnace 6 and the second heating furnace 7, the cooling medium takes away the low-temperature heat load through the condenser 4, and the medium-temperature heat load is taken away by the heated medium through the heater 11, so that the dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 5 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace 6, the external part is also provided with an air channel which is communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 is provided with a condensate pipeline, the evaporator 5 is further provided with a steam channel to be communicated with the heating furnace 6 after the condensate pipeline is communicated with the evaporator 5 through the booster pump 3, the heating furnace 6 is also provided with a steam channel to be communicated with the steam turbine 1 through an intermediate port, the compressor 2 is provided with a steam channel to be communicated with the second heating furnace 7 through the heating furnace 6, the second heating furnace 7 is also provided with a steam channel to be communicated with the steam turbine 1, and the steam turbine 1 is also provided with a low-pressure steam channel to be communicated with the evaporator 5 and then divided into two paths, namely a first path is communicated with the compressor 2 and a second path is communicated with the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In the flow chart, compared with the dual fuel combined cycle steam power plant shown in fig. 1, the difference lies in that: the condensate of the condenser 4 flows through the booster pump 3 to be boosted, flows through the evaporator 5 to absorb heat, is boosted and vaporized, flows through the heating furnace 6 to continuously absorb heat, and then enters the steam turbine 1 through the middle steam inlet port to be decompressed and work; the steam discharged by the compressor 2 flows through the heating furnace 6 and the second heating furnace 7 to gradually absorb heat and raise temperature, and then enters the steam turbine 1 to reduce pressure and do work; the low-pressure steam discharged by the steam turbine 1 passes through the evaporator 5 to release heat and cool, and then is divided into two paths, wherein the first path enters the compressor 2 to increase the pressure and the temperature, and the second path enters the condenser 4 to release heat and condense, so that the dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 6 is implemented as follows:
(1) Structurally, the system mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a second steam turbine; the exterior of the furnace is provided with a low-grade fuel channel communicated with the heating furnace 6, the exterior of the furnace is also provided with an air channel communicated with the heating furnace 6 through a heat source heat regenerator 8, and the heating furnace 6 is also provided with a fuel gas channel communicated with the exterior through the heat source heat regenerator 8; the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace 7, the outside is also provided with an air channel which is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and the second heating furnace 7 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 9; the condenser 4 has a condensate pipeline, after the condensate pipeline is communicated with the evaporator 5 through the booster pump 3, the evaporator 5 is provided with a steam channel which is communicated with the second steam turbine 12, the second steam turbine 12 is also provided with a low-pressure steam channel which is communicated with the evaporator 5, the compressor 2 is provided with a steam channel which is communicated with the second heating furnace 7 through the heating furnace 6, the second heating furnace 7 is also provided with a steam channel which is communicated with the steam turbine 1, the steam turbine 1 is also provided with a low-pressure steam channel which is communicated with the evaporator 5, and the evaporator 5 is also provided with a low-pressure steam channel which is respectively communicated with the compressor 2 and the condenser 4; the condenser 4 is also communicated with the outside through a cooling medium channel, and the steam turbine 1 is connected with the compressor 2 and transmits power.
(2) In the flow chart, compared with the dual fuel combined cycle steam power plant shown in fig. 1, the difference lies in that: the condensate of the condenser 4 flows through the booster pump 3 to be boosted, flows through the evaporator 5 to absorb heat, raise temperature and vaporize, flows through the second steam turbine 12 to reduce pressure and do work, and then enters the evaporator 5; the steam discharged by the compressor 2 gradually absorbs heat and increases temperature through the heating furnace 6 and the second heating furnace 7; the steam flows through the steam turbine 1 to reduce pressure and do work, and then enters the evaporator 5; the low-pressure steam entering the evaporator 5 is divided into two paths after releasing heat and reducing temperature, wherein the first path enters the compressor 2 for boosting pressure and heating, and the second path enters the condenser 4 for releasing heat and condensing; the work output by the turbine 1 and the second turbine 12 is provided to the compressor 2 and the external actuating power, or the work output by the turbine 1 and the second turbine 12 is provided to the compressor 2, the booster pump 3 and the external actuating power, so that a dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 7 is implemented as follows:
(1) Structurally, in the dual-fuel combined-cycle steam power plant shown in fig. 1, the communication between the steam passage of the second heating furnace 7 and the steam turbine 1 is adjusted so that the second heating furnace 7 has the steam passage to communicate with the steam turbine 1 and then the steam turbine 1 and the reheat steam passage communicate with each other through the second heating furnace 7.
(2) In the flow chart, compared with the dual fuel combined cycle steam power plant shown in fig. 1, the difference lies in that: the steam generated by the second heating furnace 7 enters the steam turbine 1 to reduce the pressure and do work to a certain degree, then enters the second heating furnace 7 to absorb heat and raise the temperature, then enters the steam turbine 1 to continue reducing the pressure and doing work, and the low-pressure steam discharged by the steam turbine 1 is supplied to the evaporator 5 to form the dual-fuel combined cycle steam power device.
The dual fuel combined cycle steam power plant shown in fig. 8 is implemented as follows:
(1) Structurally, in the dual fuel combined cycle steam power plant shown in fig. 1, an expansion speed increaser 13 is added to replace the steam turbine 1, a dual energy compressor 14 is added to replace the compressor 2, and a diffuser 15 is added to replace the booster pump 3.
(2) In flow, compared to the dual fuel combined cycle steam power plant shown in fig. 1, the difference is that: the condensate of the condenser 4 flows through the diffuser pipe 15 to reduce the speed and increase the pressure, flows through the evaporator 5 to absorb heat and increase the temperature and vaporize, flows through the heating furnace 6 to continuously absorb heat, then enters the second heating furnace 7 to absorb heat and increase the temperature, and the steam discharged by the dual-energy compressor 14 flows through the heating furnace 6 and the second heating furnace 7 to gradually absorb heat and increase the temperature; the steam discharged by the second heating furnace 7 flows through the expansion speed increaser 13 to reduce the pressure, do work and increase the speed, the low-pressure steam discharged by the expansion speed increaser 13 flows through the evaporator 5 to release heat and reduce the temperature, then the low-pressure steam is divided into two paths, the first path enters the dual-function compressor 14 to increase the pressure, increase the temperature and reduce the speed, the second path enters the condenser 4 to release heat and condense, the work output by the expansion speed increaser 13 is provided for the dual-function compressor 14 and the external power, and the dual-fuel combined cycle steam power device is formed.
The dual fuel combined cycle steam power plant shown in fig. 9 is implemented as follows:
(1) Structurally, in the dual-fuel combined cycle steam power plant shown in fig. 1, a low-temperature heat regenerator and a second booster pump are added, the condenser 4 is adjusted to be communicated with the booster pump 3 through a condensate pipeline, the condenser 4 is adjusted to be communicated with the low-temperature heat regenerator 16 through a second booster pump 17, a steam extraction channel is additionally arranged on the compressor 2 to be communicated with the low-temperature heat regenerator 16, and the low-temperature heat regenerator 16 is communicated with the booster pump 3 through a condensate pipeline.
(2) In flow, compared to the dual fuel combined cycle steam power plant shown in fig. 1, the difference is that: the condensate discharged by the condenser 4 flows through a second booster pump 17 to be boosted and then enters a low-temperature heat regenerator 16 to be mixed with the extracted steam from the compressor 2, absorb heat and raise the temperature, and the extracted steam releases heat to form condensate; the condensate of the low-temperature heat regenerator 16 flows through the booster pump 3 to be boosted, flows through the evaporator 5 to absorb heat and be boosted and vaporized, flows through the heating furnace 6 to continuously absorb heat, then enters the second heating furnace 7 to absorb heat and be boosted, and the steam discharged by the compressor 2 flows through the heating furnace 6 and the second heating furnace 7 to gradually absorb heat and be boosted; the steam discharged by the second heating furnace 7 flows through the steam turbine 1 to reduce the pressure and do work, the low-pressure steam discharged by the steam turbine 1 flows through the evaporator 5 to release heat and reduce the temperature, and then the low-pressure steam is divided into two paths, wherein the first path enters the compressor 2 to increase the pressure and the temperature, and the second path enters the condenser 4 to release heat and condense; the low-pressure steam entering the compressor 2 is subjected to pressure boosting and temperature rising to a certain degree and then is divided into two paths, wherein the first path is provided for the low-temperature heat regenerator 16, and the second path is subjected to pressure boosting and temperature rising continuously and then enters the heating furnace 6 to form the dual-fuel combined cycle steam power device.
The dual fuel combined cycle steam power plant shown in fig. 10 is implemented as follows:
(1) Structurally, in the dual fuel combined cycle steam power plant shown in fig. 9, an expansion speed increaser 13 is added to replace the steam turbine 1, a dual-energy compressor 14 is added to replace the compressor 2, a diffuser pipe 15 is added to replace the booster pump 3, and a second diffuser pipe 18 is added to replace the second booster pump 17.
(2) In the flow chart, compared to the dual fuel combined cycle steam power plant shown in fig. 9, the differences are: the condensate discharged by the condenser 4 flows through a second diffuser pipe 18, is subjected to speed reduction and pressure increase, then enters a low-temperature heat regenerator 16, is mixed with the extracted steam from the dual-energy compressor 14, absorbs heat and is heated, and the extracted steam releases heat to form condensate; the condensate of the low-temperature heat regenerator 16 flows through a diffuser pipe 15 for speed reduction and pressure increase, flows through the evaporator 5 for heat absorption and temperature increase and vaporization, flows through the heating furnace 6 for continuous heat absorption, then enters the second heating furnace 7 for heat absorption and temperature increase, and the steam discharged by the dual-energy compressor 14 flows through the heating furnace 6 and the second heating furnace 7 for gradual heat absorption and temperature increase; the steam discharged by the second heating furnace 7 flows through the expansion speed increaser 13 to reduce the pressure, do work and increase the speed, the low-pressure steam discharged by the expansion speed increaser 13 flows through the evaporator 5 to release heat and reduce the temperature, and then is divided into two paths, wherein the first path enters the dual-energy compressor 14 to increase the pressure, raise the temperature and reduce the speed, and the second path enters the condenser 4 to release heat and condense; the low-pressure steam entering the dual-energy compressor 14 is subjected to pressure boosting and temperature rising and speed reduction to a certain degree and then divided into two paths, wherein the first path is provided for the low-temperature heat regenerator 16, and the second path is subjected to pressure boosting and temperature rising continuously and then enters the heating furnace 6 to form the dual-fuel combined cycle steam power device.
The dual fuel combined cycle steam power plant shown in fig. 11 is implemented as follows:
(1) Structurally, in the dual-fuel combined cycle steam power plant shown in fig. 1, a second heat source heat regenerator is omitted, an external air channel is communicated with the heating furnace 6 through the heat source heat regenerator 8, and the external air channel is communicated with the second heating furnace 7 through a second heat source heat regenerator 9, and is adjusted into two paths after the external air channel is communicated with the heat source heat regenerator 8, wherein the first path is communicated with the heating furnace 6, and the second path is communicated with the second heating furnace 7; the second heating furnace 7 is adjusted to be communicated with the outside through a second heat source heat regenerator 9, and the second heating furnace 7 is adjusted to be communicated with the outside through a heat source heat regenerator 8.
(2) The difference in flow from the dual fuel combined cycle steam power plant shown in fig. 1 is: the fuel gas discharged by the second heating furnace 7 is discharged to the outside after being discharged by heat release of the heat source heat regenerator 8, and the external air is divided into two paths after being heated by heat absorption of the heat source heat regenerator 8, wherein the first path enters the heating furnace 6 to participate in combustion, and the second path enters the second heating furnace 7 to participate in combustion, so that the dual-fuel combined cycle steam power device is formed.
The effect that the technology of the invention can realize-the dual-fuel combined cycle steam power device provided by the invention has the following effects and advantages:
(1) The method has the advantages of reasonable collocation, sectional construction and gradual temperature rise, and effectively reduces the irreversible loss of temperature difference in the process of forming a high-temperature heat source.
(2) The low-grade fuel combines the high-grade fuel to provide high-temperature driving heat load for the combined cycle steam power device, and the low-grade fuel exerts the effect of the high-grade fuel, thereby greatly improving the utilization rate of converting the low-grade fuel into mechanical energy.
(3) The investment of high-grade fuel is directly reduced, and the effect is equal to the improvement of the utilization rate of converting the high-grade fuel into mechanical energy.
(4) When the low-grade fuel is used in a subsection mode, the grade of high-temperature fuel gas is obviously improved, and the utilization value of the low-grade fuel is improved.
(5) 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.
(6) The structure is simple, and the flow is reasonable; the selection range and the use value of the fuel of the thermal power device are improved, and the energy consumption cost is reduced.
(7) The technical schemes are provided, so that the manufacturing cost of the thermal power device is reduced, and the technical application range is expanded.

Claims (13)

1. The dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with a second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the condensate pipeline is communicated with the evaporator (5) through the booster pump (3), then a steam channel of the evaporator (5) is communicated with the second heating furnace (7) through the heating furnace (6), a steam channel of the compressor (2) is communicated with the second heating furnace (7) through the heating furnace (6), the second heating furnace (7) is also provided with a steam channel which is communicated with the steam turbine (1), the steam turbine (1) is also provided with a low-pressure steam channel which is communicated with the evaporator (5) and then divided into two paths, namely, the first path is communicated with the compressor (2) and the second path is communicated with the condenser (4); the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
2. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with a second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the condensate pipeline is communicated with the evaporator (5) through the booster pump (3), then a steam channel of the evaporator (5) is communicated with the second heating furnace (7) through the high-temperature heat regenerator (10) and the heating furnace (6), the compressor (2) is provided with a steam channel, the high-temperature heat regenerator (10) and the heating furnace (6) are communicated with the second heating furnace (7), the second heating furnace (7) is also provided with a steam channel which is communicated with the steam turbine (1), the steam turbine (1) is also provided with a low-pressure steam channel which is communicated with the evaporator (5) through the high-temperature heat regenerator (10) and then divided into two paths, namely, the first path is communicated with the compressor (2), and the second path is communicated with the condenser (4); the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the steam turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
3. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a high-temperature heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with a second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the condensate pipeline is communicated with the evaporator (5) through the booster pump (3), then a steam channel of the evaporator (5) is communicated with the second heating furnace (7) through the high-temperature heat regenerator (10) and the heating furnace (6), the compressor (2) is provided with a steam channel, the steam channel is communicated with the second heating furnace (7) through the high-temperature heat regenerator (10) and the heating furnace (6), the second heating furnace (7) is also provided with a steam channel which is communicated with the steam turbine (1), then the steam channel of the steam turbine (1) is communicated with the steam turbine (1) through the high-temperature heat regenerator (10), and the steam turbine (1) is also provided with a low-pressure steam channel which is communicated with the evaporator (5) and then divided into two paths, namely a first path is communicated with the compressor (2) and a second path is communicated with the condenser (4); the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the steam turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
4. The dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a heat supplier; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with a second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the condenser pipeline is communicated with the heating furnace (6) through the booster pump (3), then a steam channel of the heating furnace (6) is communicated with the second heating furnace (7), the compressor (2) is provided with a steam channel which is communicated with the second heating furnace (7), the second heating furnace (7) is also provided with a steam channel which is communicated with the steam turbine (1), the steam turbine (1) is also provided with a low-pressure steam channel which is communicated with the heater (11) and then divided into two paths, namely, the first path is communicated with the compressor (2) and the second path is communicated with the condenser (4); the condenser (4) is also provided with a cooling medium channel communicated with the outside, the heat supply device (11) is also provided with a heated medium channel communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the steam turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
5. The dual-fuel combined cycle steam power device mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator and a second heat source heat regenerator; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with a second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the condensate pipeline is communicated with the evaporator (5) through the booster pump (3), then a steam channel of the evaporator (5) is communicated with the heating furnace (6), a steam channel of the heating furnace (6) is communicated with the steam turbine (1) through an intermediate port, a steam channel of the compressor (2) is communicated with the second heating furnace (7) through the heating furnace (6), a steam channel of the second heating furnace (7) is communicated with the steam turbine (1), the steam turbine (1) is also provided with a low-pressure steam channel which is communicated with the evaporator (5) and then divided into two paths, namely, the first path is communicated with the compressor (2) and the second path is communicated with the condenser (4); the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the steam turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
6. The dual-fuel combined cycle steam power plant mainly comprises a steam turbine, a compressor, a booster pump, a condenser, an evaporator, a heating furnace, a second heating furnace, a heat source heat regenerator, a second heat source heat regenerator and a second steam turbine; the external part is provided with a low-grade fuel channel which is communicated with the heating furnace (6), the external part is also provided with an air channel which is communicated with the heating furnace (6) through a heat source heat regenerator (8), and the heating furnace (6) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (8); the outside is also provided with a high-grade fuel channel which is communicated with the second heating furnace (7), the outside is also provided with an air channel which is communicated with the second heating furnace (7) through a second heat source heat regenerator (9), and the second heating furnace (7) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (9); the condenser (4) is provided with a condensate pipeline, the evaporator (5) is further provided with a steam channel to be communicated with a second steam turbine (12) after the condensate pipeline is communicated with the evaporator (5) through a booster pump (3), the second steam turbine (12) is also provided with a low-pressure steam channel to be communicated with the evaporator (5), the compressor (2) is provided with a steam channel to be communicated with a second heating furnace (7) through a heating furnace (6), the second heating furnace (7) is also provided with a steam channel to be communicated with a steam turbine (1), the steam turbine (1) is also provided with a low-pressure steam channel to be communicated with the evaporator (5), and the evaporator (5) is also provided with a low-pressure steam channel to be respectively communicated with the compressor (2) and the condenser (4); the condenser (4) is also provided with a cooling medium channel which is communicated with the outside, and the steam turbine (1) is connected with the compressor (2) and transmits power to form a dual-fuel combined cycle steam power device; wherein, or the turbine (1) is connected with the compressor (2) and the booster pump (3) and transmits power.
7. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices of claims 1-6, a second heating furnace (7) is provided with a steam channel to be communicated with a steam turbine (1) and adjusted to be that the second heating furnace (7) is provided with a steam channel to be communicated with the steam turbine (1), and then the steam turbine (1) is also provided with a reheated steam channel to be communicated with the steam turbine (1) through the heating furnace (6) to form the dual-fuel combined cycle steam power device.
8. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices of claims 1-6, a second heating furnace (7) is provided with a steam channel to be communicated with a steam turbine (1) and adjusted to be that the second heating furnace (7) is provided with a steam channel to be communicated with the steam turbine (1), and then the steam turbine (1) is also provided with a reheated steam channel to be communicated with the steam turbine (1) through the second heating furnace (7) to form the dual-fuel combined cycle steam power device.
9. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices of claims 1-6, a second heating furnace (7) is provided with a steam channel to be communicated with a steam turbine (1) and adjusted to be that the second heating furnace (7) is provided with a steam channel to be communicated with the steam turbine (1), and then the steam turbine (1) is also provided with a reheated steam channel to be communicated with the dual-fuel combined cycle steam power device through the heating furnace (6) and the second heating furnace (7) to form the dual-fuel combined cycle steam power device.
10. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in claims 1-9, an expansion speed increaser (13) is added to replace a steam turbine (1), a dual-energy compressor (14) is added to replace a compressor (2), a diffuser pipe (15) is added to replace a booster pump (3), and the dual-fuel combined cycle steam power device is formed.
11. A dual-fuel combined cycle steam power device is characterized in that a low-temperature heat regenerator and a second booster pump are added in any one of the dual-fuel combined cycle steam power devices of claims 1 to 9, a condenser (4) is provided with a condensate liquid pipeline which is communicated with the booster pump (3) and adjusted to be that the condenser (4) is provided with a condensate liquid pipeline which is communicated with the low-temperature heat regenerator (16) through the second booster pump (17), a steam extraction channel is additionally arranged on a compressor (2) and is communicated with the low-temperature heat regenerator (16), and the low-temperature heat regenerator (16) is further provided with a condensate liquid pipeline which is communicated with the booster pump (3), so that the dual-fuel combined cycle steam power device is formed.
12. A dual-fuel combined cycle steam power device is characterized in that in any one of the dual-fuel combined cycle steam power devices in claim 11, an expansion speed increaser (13) is added to replace a steam turbine (1), a dual-energy compressor (14) is added to replace a compressor (2), a diffuser pipe (15) is added to replace a booster pump (3), and a second diffuser pipe (18) is added to replace a second booster pump (17), so that the dual-fuel combined cycle steam power device is formed.
13. A dual-fuel combined cycle steam power device is in any one dual-fuel combined cycle steam power device of claims 1 to 12, a second heat source heat regenerator is cancelled, an external air channel is communicated with a heating furnace (6) through a heat source heat regenerator (8), and an external air channel is communicated with a second heating furnace (7) through a second heat source heat regenerator (9), and the dual-fuel combined cycle steam power device is adjusted to be divided into two paths after the external air channel is communicated with the heat source heat regenerator (8), wherein the first path is communicated with the heating furnace (6), and the second path is communicated with the second heating furnace (7); and a fuel gas channel of the second heating furnace (7) is communicated with the outside through a second heat source heat regenerator (9) and adjusted to be communicated with the outside through a heat source heat regenerator (8) of the second heating furnace (7), so that the dual-fuel combined cycle steam power device is formed.
CN202210119600.4A 2021-01-27 2022-01-26 Dual-fuel combined cycle steam power device Pending CN115217556A (en)

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CN202110157335 2021-01-27
CN2021101573354 2021-01-27

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