CN115217547A

CN115217547A - Double-fuel steam power device

Info

Publication number: CN115217547A
Application number: CN202111585496.XA
Authority: CN
Inventors: 李华玉; 李鸿瑞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-20
Filing date: 2021-12-19
Publication date: 2022-10-21

Abstract

The invention provides a dual-fuel steam power device, and belongs to the technical field of thermodynamics and thermodynamics. The steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump and the boiler, and then the second boiler is also provided with a high-pressure steam channel communicated with the steam turbine; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

Description

Dual-fuel 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 combustion to form fuel gas is closely related to the conversion efficiency; from the temperature of fuel gas formed by combustion, such as adiabatic combustion temperature or 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 the converted mechanical energy is relatively less corresponding to a low-grade heat source.

In addition, due to the limitations of the operating principle, the material properties, the manufacturing level of the heat exchange equipment, and the like, in the steam power plant using the high-grade fuel, the high-temperature heat source formed by the high-grade fuel is often used for reducing the temperature, which means that a part of combustion heat directly forms a heat source with a lower temperature, and this results in the quality loss in the utilization of the fuel.

The invention provides a dual-fuel steam power device which reasonably matches and uses low-grade fuel and high-grade fuel, realizes the complementation of advantages and shortages and the complementation of advantages, can simultaneously improve the utilization efficiency of the two fuels, reduces the emission of greenhouse gases and effectively reduces the fuel cost.

The invention content is as follows:

the invention mainly aims to provide a dual-fuel steam power device, and the specific contents of the invention are explained in detail as follows:

1. the dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump, and then the second boiler is provided with a high-pressure steam channel communicated with the steam turbine; the external part of the boiler is provided with a low-grade fuel channel communicated with the boiler, the external part of the boiler is also provided with an air channel communicated with the boiler through a heat source heat regenerator, and the boiler is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

2. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through a booster pump, then the second boiler is also provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheat steam channel communicated with the second boiler through the boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

3. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump, then the second boiler is provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheat steam channel communicated with the second boiler through the second boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the turbine is connected with the booster pump and transmits power.

4. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through a booster pump, then the second boiler is provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheat steam channel communicated with the steam turbine through the boiler and the second boiler; the external part of the boiler is provided with a low-grade fuel channel communicated with the boiler, the external part of the boiler is also provided with an air channel communicated with the boiler through a heat source heat regenerator, and the boiler is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

5. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump and the boiler, and then the second boiler is also provided with a high-pressure steam channel communicated with the steam turbine; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

6. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump and the boiler, then the second boiler is provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheat steam channel communicated with the steam turbine through the boiler; the external part of the boiler is provided with a low-grade fuel channel communicated with the boiler, the external part of the boiler is also provided with an air channel communicated with the boiler through a heat source heat regenerator, and the boiler is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

7. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline, the condensate pipeline is communicated with the second boiler through the booster pump and the boiler, then the second boiler is provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheat steam channel communicated with the second boiler through the second boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

8. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with the second boiler through the booster pump and the boiler, then the second boiler is also provided with a high-pressure steam channel communicated with the steam turbine, and the steam turbine is also provided with a reheating steam channel communicated with the steam turbine through the boiler and the second boiler; the external part of the boiler is provided with a low-grade fuel channel communicated with the boiler, the external part of the boiler is also provided with an air channel communicated with the boiler through a heat source heat regenerator, and the boiler is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine is connected with the booster pump and transmits power.

9. A dual-fuel steam power device is characterized in that a heat regenerator and a newly added booster pump are added in any one of the dual-fuel steam power devices in items 1 to 8, a condenser is adjusted to be communicated with the booster pump through a condensate pipeline, the condenser is adjusted to be communicated with the heat regenerator through the newly added booster pump, a steam turbine is provided with a steam extraction channel to be communicated with the heat regenerator, and the heat regenerator is communicated with the booster pump through the condensate pipeline, so that the dual-fuel steam power device is formed.

10. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam passage communicated with the condenser, the condenser is also provided with a condensate liquid pipeline communicated with the second boiler through a diffuser pipe, and then the second boiler is provided with a high-pressure steam passage communicated with the expansion speed increaser; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

11. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam passage communicated with the condenser, the condenser is also provided with a condensate liquid pipeline which is communicated with the second boiler through a diffuser pipe, then the second boiler is provided with a high-pressure steam passage communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheat steam passage communicated with the second boiler through the boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

12. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam passage communicated with the condenser, the condenser is also provided with a condensate liquid pipeline which is communicated with the second boiler through a diffuser pipe, then the second boiler is also provided with a high-pressure steam passage communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheat steam passage communicated with the second boiler through the second boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

13. The dual-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam passage communicated with the condenser, the condenser is also provided with a condensate liquid pipeline which is communicated with the second boiler through a diffuser pipe, then the second boiler is provided with a high-pressure steam passage communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheat steam passage communicated with the second boiler through the boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

14. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam channel communicated with a condenser, the condenser is also provided with a condensate liquid pipeline, the condenser is communicated with a second boiler through a diffuser pipe, and then the second boiler is provided with a high-pressure steam channel communicated with the expansion speed increaser; the external part of the boiler is provided with a low-grade fuel channel communicated with the boiler, the external part of the boiler is also provided with an air channel communicated with the boiler through a heat source heat regenerator, and the boiler is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator; the outside of the boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

15. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam channel communicated with a condenser, the condenser is also provided with a condensate pipeline which is communicated with a second boiler through a diffuser pipe and the boiler, then the second boiler is also provided with a high-pressure steam channel communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheating steam channel which is communicated with the second boiler through the boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

16. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam channel communicated with the condenser, the condenser is also provided with a condensate pipeline which is communicated with a second boiler through a diffuser pipe and the boiler, then the second boiler is also provided with a high-pressure steam channel communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheat steam channel which is communicated with the second boiler through the second boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

17. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser is provided with a low-pressure steam passage communicated with a condenser, the condenser is also provided with a condensate liquid pipeline which is communicated with a second boiler through a diffuser pipe, then the second boiler is also provided with a high-pressure steam passage communicated with the expansion speed increaser, and the expansion speed increaser is also provided with a reheat steam passage communicated with the second boiler through the boiler; the external part of the boiler is provided with a low-grade fuel channel which is communicated with the boiler, the external part of the boiler is also provided with an air channel which is communicated with the boiler through a heat source heat regenerator, and the boiler 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 boiler is also provided with a high-grade fuel channel which is communicated with a second boiler, the outside of the boiler is also provided with an air channel which is communicated with the second boiler through a second heat source heat regenerator and the boiler, and the second boiler is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator; the condenser is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

18. A dual-fuel steam power device is characterized in that a heat regenerator and a newly-added diffuser pipe are added in any one of the dual-fuel steam power devices in items 10-17, the communication between a condenser and the diffuser pipe is adjusted to be that the condenser is provided with a condensate pipeline which is communicated with the heat regenerator through the newly-added diffuser pipe, an expansion speed increaser is provided with a steam extraction channel which is communicated with the heat regenerator, and the heat regenerator is provided with a condensate pipeline which is communicated with the diffuser pipe to form the dual-fuel steam power device.

19. A dual-fuel steam power device is characterized in that in any one of the dual-fuel steam power devices 1 to 18, a second heat source heat regenerator is cancelled, an external air channel is communicated with a boiler through the heat source heat regenerator, the external air channel is communicated with a second boiler through the second heat source heat regenerator and the boiler, and the two paths are adjusted together into two paths after the external air channel is communicated with the heat source heat regenerator, wherein the first path is communicated with the boiler, and the second path is communicated with the second boiler through the boiler; and adjusting the communication between the second boiler gas channel and the outside through a second heat source heat regenerator to ensure that the second boiler gas channel is communicated with the outside through the heat source heat regenerator to form the dual-fuel steam power device.

Description of the drawings:

fig. 1 is a schematic thermodynamic system diagram of a dual fuel steam power plant 1 provided in accordance with the present invention.

Fig. 2 is a schematic thermodynamic system diagram of a dual fuel steam power plant of type 2 provided in accordance with the present invention.

Fig. 3 is a 3 rd principle thermodynamic system diagram of a dual fuel steam power plant provided in accordance with the present invention.

Fig. 4 is a diagram of a 4 th principle thermodynamic system of a dual fuel 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 steam power plant provided in accordance with the present invention.

Fig. 6 is a 6 th principle thermodynamic system diagram of a dual fuel steam power plant provided in accordance with the present invention.

Fig. 7 is a 7 th principle thermodynamic system diagram of a dual fuel steam power plant provided in accordance with the present invention.

Fig. 8 is a diagram of an 8 th principle thermodynamic system of a dual fuel steam power plant provided in accordance with the present invention.

Fig. 9 is a diagram of a 9 th principle thermodynamic system of a dual fuel steam power plant provided in accordance with the present invention.

Fig. 10 is a 10 th principle thermodynamic system diagram of a dual fuel steam 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 boiler, 5-a second boiler, 6-a heat source heat regenerator, 7-a second heat source heat regenerator, 8-an expansion speed increaser, 9-a diffuser pipe and 10-a heat regenerator; a-a newly-increased pressure pump and B-a newly-increased pressure-expanding pipe.

(1) In order to reveal the differences in the operational sequences of the steam turbine 1 and the expansion gear 8, the following is explained here:

(1) in the steam power plant shown in fig. 1, the steam flows through the steam turbine 1 to achieve heat-variable 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 2 can be provided by the steam turbine 1 through mechanical transmission or from the outside; in contrast, in the steam power plant shown in fig. 7, the steam at the outlet of the expansion speed increaser 8 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) so as to meet the requirement of reducing the speed and increasing the pressure of the diffuser pipe 9.

(2) The process of realizing thermal work change by the high-pressure high-temperature steam flowing through the steam turbine 1 in fig. 1 adopts 'pressure reduction work', and the process of realizing thermal work change by the high-pressure high-temperature steam flowing through the expansion speed increaser 8 in fig. 7 adopts 'pressure reduction work and speed increase'.

(2) Description on two boilers:

(1) the heat source regenerator relates to the temperature grade of fuel gas in a boiler and is listed separately.

(2) As required, a heat exchanger (heat exchange tube bundle) such as an economizer that heats condensate after being boosted by a booster pump, an evaporator, a reheater that reheats steam, and the like is provided inside the boiler.

(3) The specific heat exchange tube bundle (economizer, evaporator or reheater) involved in the heating and vaporization or reheating of the circulating medium flowing through the boiler is not specifically indicated, but the boiler is uniformly used for expression.

(3) With respect to low-grade and high-grade fuels, a brief description is given here:

(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, combustible garbage 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 in which the highest temperature at which combustion products can form (such as adiabatic combustion temperature or fixed pressure combustion temperature) is relatively high; 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 high 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), are not separately listed, and the functions of the solid substances are not separately expressed.

(4) The grade of the fuel is divided by the highest temperature formed by combustion products minus the temperature difference of indirect heat transfer, especially for the fuel which needs to provide driving high-temperature heat load to the circulating working medium by indirect means; or, the temperature which can be reached by the circulating working medium under the existing technical conditions is divided into high-grade fuel and low-grade fuel, wherein the high-grade fuel is the one with higher temperature which can be reached by the circulating working medium (working medium), and the low-grade fuel is the one with lower temperature which can be reached by the circulating working medium (working medium).

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 steam power plant shown in fig. 1 is implemented as follows:

(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine 1 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through the booster pump 2, and then the second boiler 5 is provided with a high-pressure steam channel communicated with the steam turbine 1; the external part is provided with a low-grade fuel channel communicated with the boiler 4, the external part is also provided with an air channel communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the steam turbine 1 to reduce the pressure and do work, low-pressure steam discharged by the steam turbine 1 flows through the condenser 3 to release heat and condense, flows through the booster pump 2 to increase the pressure, flows through the second boiler 5 to absorb heat, raise the temperature and vaporize, and then is supplied to the steam turbine 1; external low-grade fuel enters the boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through the heat source heat regenerator 6, the low-grade fuel and the air are mixed and combusted in the boiler 4 to form fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air flowing through the fuel gas and lowers the temperature, and then the fuel gas flows through the heat source heat regenerator 6 to release heat and lower the temperature and is discharged outwards; external high-grade fuel enters a second boiler 5, external second path air gradually absorbs heat and is heated after flowing through a second heat source heat regenerator 7 and a boiler 4, and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 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 is cooled, and then the high-temperature fuel gas flows through the second heat source heat regenerator 7 to release heat, is cooled and is discharged outwards; the low-grade fuel and the high-grade fuel jointly provide driving heat load through a boiler 4 and a second boiler 5, cooling medium takes away the low-temperature heat load through a condenser 3, work output by a steam turbine 1 is provided to the outside or work output by the steam turbine 1 is provided to a booster pump 2 and the outside, and the dual-fuel steam power device is formed.

The dual fuel steam power plant shown in fig. 2 is implemented as follows:

(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine 1 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through the booster pump 2, then the second boiler 5 is provided with a high-pressure steam channel communicated with the steam turbine 1, and the steam turbine 1 is also provided with a reheat steam channel communicated with the steam turbine 1 through the boiler 4; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the steam turbine 1 to reduce the pressure and do work to a certain degree, then flows through the boiler 4 to absorb heat and raise the temperature, and then enters the steam turbine 1 to continuously reduce the pressure and do work; the low-pressure steam discharged by the steam turbine 1 releases heat and is condensed through the condenser 3, is boosted through the booster pump 2, absorbs heat, is heated and vaporized through the second boiler 5, and is supplied to the steam turbine 1; the external low-grade fuel enters a boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through a heat source heat regenerator 6, the low-grade fuel and the air are mixed in the boiler 4 and are combusted into fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air and the circulating working medium flowing through the fuel gas and lowers the temperature, and then the fuel gas releases heat and lowers the temperature through the heat source heat regenerator 6 and is discharged to the outside; the external high-grade fuel enters a second boiler 5, the external second path of air gradually absorbs heat and heats through a second heat source heat regenerator 7 and a boiler 4 and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 to form high-temperature fuel gas, the high-temperature fuel gas releases heat to the circulating working medium flowing through the high-temperature fuel gas and cools, and then the high-temperature fuel gas releases heat and cools through the second heat source heat regenerator 7 and is discharged to the outside; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the boiler 4 and the second boiler 5, the cooling medium takes away the low-temperature heat load through the condenser 3, and the work output by the steam turbine 1 is provided outwards to form the dual-fuel steam power device.

The dual fuel steam power plant shown in fig. 3 is implemented as follows:

(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine 1 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through the booster pump 2, then the second boiler 5 is provided with a high-pressure steam channel communicated with the steam turbine 1, and the steam turbine 1 is also provided with a reheat steam channel which is communicated with the second boiler 5 through the second boiler 5; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the steam turbine 1 to reduce the pressure and do work to a certain degree, then flows through the second boiler 5 to absorb heat and raise the temperature, and then enters the steam turbine 1 to continuously reduce the pressure and do work; low-pressure steam discharged by the steam turbine 1 is subjected to heat release and condensation through the condenser 3, is subjected to pressure boosting through the booster pump 2, is subjected to heat absorption, temperature rise and vaporization through the second boiler 5, and is supplied to the steam turbine 1; external low-grade fuel enters the boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through the heat source heat regenerator 6, the low-grade fuel and the air are mixed and combusted in the boiler 4 to form fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air flowing through the fuel gas and lowers the temperature, and then the fuel gas flows through the heat source heat regenerator 6 to release heat and lower the temperature and is discharged outwards; external high-grade fuel enters a second boiler 5, external second path air gradually absorbs heat and is heated after flowing through a second heat source heat regenerator 7 and a boiler 4, and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 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 is cooled, and then the high-temperature fuel gas flows through the second heat source heat regenerator 7 to release heat, is cooled and is discharged outwards; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the boiler 4 and the second boiler 5, the cooling medium takes away the low-temperature heat load through the condenser 3, and the work output by the steam turbine 1 is provided outwards to form the dual-fuel steam power device.

The dual fuel steam power plant shown in fig. 4 is implemented as follows:

(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine 1 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through the booster pump 2, then the second boiler 5 is provided with a high-pressure steam channel communicated with the steam turbine 1, and the steam turbine 1 is also provided with a reheat steam channel which is communicated with the second boiler 5 through the boiler 4; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the steam turbine 1 to reduce pressure and do work to a certain degree, then flows through the boiler 4 and the second boiler 5 to gradually absorb heat and raise temperature, and then enters the steam turbine 1 to continuously reduce pressure and do work; the low-pressure steam discharged by the steam turbine 1 releases heat and is condensed through the condenser 3, is boosted through the booster pump 2, absorbs heat, is heated and vaporized through the second boiler 5, and is supplied to the steam turbine 1; the external low-grade fuel enters a boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through a heat source heat regenerator 6, the low-grade fuel and the air are mixed in the boiler 4 and are combusted into fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air and the circulating working medium flowing through the fuel gas and lowers the temperature, and then the fuel gas releases heat and lowers the temperature through the heat source heat regenerator 6 and is discharged to the outside; the external high-grade fuel enters a second boiler 5, the external second path of air gradually absorbs heat and heats through a second heat source heat regenerator 7 and a boiler 4 and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 to form high-temperature fuel gas, the high-temperature fuel gas releases heat to the circulating working medium flowing through the high-temperature fuel gas and cools, and then the high-temperature fuel gas releases heat and cools through the second heat source heat regenerator 7 and is discharged to the outside; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the boiler 4 and the second boiler 5, the cooling medium takes away the low-temperature heat load through the condenser 3, and the work output by the steam turbine 1 is provided outwards to form the dual-fuel steam power device.

The dual fuel steam power plant shown in fig. 5 is implemented as follows:

(1) Structurally, the system mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine 1 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through the booster pump 2 and the boiler 4, and then the second boiler 5 is provided with a high-pressure steam channel communicated with the steam turbine 1; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the steam turbine 1 to reduce the pressure and do work, low-pressure steam discharged by the steam turbine 1 flows through the condenser 3 to release heat and condense, flows through the booster pump 2 to increase the pressure, flows through the boiler 4 and the second boiler 5 to gradually absorb heat and increase the temperature and vaporize, and then is supplied to the steam turbine 1; the external low-grade fuel enters a boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through a heat source heat regenerator 6, the low-grade fuel and the air are mixed in the boiler 4 and are combusted into fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air and the circulating working medium flowing through the fuel gas and lowers the temperature, and then the fuel gas releases heat and lowers the temperature through the heat source heat regenerator 6 and is discharged to the outside; external high-grade fuel enters a second boiler 5, external second path air gradually absorbs heat and is heated after flowing through a second heat source heat regenerator 7 and a boiler 4, and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 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 is cooled, and then the high-temperature fuel gas flows through the second heat source heat regenerator 7 to release heat, is cooled and is discharged outwards; the low-grade fuel and the high-grade fuel jointly provide driving heat load through a boiler 4 and a second boiler 5, the cooling medium takes away the low-temperature heat load through a condenser 3, the work output by the steam turbine 1 is provided to the outside or the work output by the steam turbine 1 is provided to the booster pump 2 and the outside, and the dual-fuel steam power device is formed.

The dual fuel steam power plant shown in fig. 6 is implemented as follows:

(1) Structurally, in the dual-fuel steam power device shown in fig. 5, a heat regenerator and a newly added booster pump are added, a condensate pipeline of a condenser 3 is communicated with the booster pump 2, the condensate pipeline of the condenser 3 is communicated with the heat regenerator 10 through the newly added booster pump a, a steam extraction channel of the steam turbine 1 is communicated with the heat regenerator 10, and the heat regenerator 10 is communicated with the booster pump 2 through the condensate pipeline.

(2) In the flow, the difference from the dual-fuel steam power plant shown in fig. 5 is that: the high-temperature high-pressure steam entering the steam turbine 1 is decompressed to work to a certain degree and then divided into two paths, wherein the first path is provided for the heat regenerator 10, and the second path continues to be decompressed to work and then enters the condenser 3; the condensate discharged by the condenser 3 enters the heat regenerator 10 after being boosted by the newly-added booster pump A, is mixed with the extracted steam from the steam turbine 1, absorbs heat and raises the temperature, and the extracted steam releases heat to form condensate; the condensate of the regenerator 10 is boosted by the booster pump 2 and then supplied to the boiler 4, forming a dual-fuel steam power plant.

The dual fuel steam power plant shown in fig. 7 is implemented as follows:

(1) Structurally, the system mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine 8 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline communicated with the second boiler 5 through a diffuser pipe 9, and then the second boiler 5 is provided with a high-pressure steam channel communicated with the expansion speed increasing machine 8; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the expansion speed increaser 8 to reduce the pressure, do work and increase the speed, low-pressure steam discharged by the expansion speed increaser 8 flows through the condenser 3 to release heat and condense, flows through the diffuser pipe 9 to reduce the speed and increase the pressure, flows through the second boiler 5 to absorb heat, raise the temperature and vaporize, and then is supplied to the expansion speed increaser 8; the external low-grade fuel enters a boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through a heat source heat regenerator 6, the low-grade fuel and the air are mixed in the boiler 4 and are combusted into fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air flowing through the fuel gas and lowers the temperature, and then the fuel gas flows through the heat source heat regenerator 6 to release heat and lower the temperature and is discharged to the outside; external high-grade fuel enters a second boiler 5, external second path air gradually absorbs heat and is heated after flowing through a second heat source heat regenerator 7 and a boiler 4, and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 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 is cooled, and then the high-temperature fuel gas flows through the second heat source heat regenerator 7 to release heat, is cooled and is discharged outwards; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the boiler 4 and the second boiler 5, the cooling medium takes away the low-temperature heat load through the condenser 3, and the work output by the expansion speed increaser 8 is provided to the outside to form a dual-fuel steam power device.

The dual fuel steam power plant shown in fig. 8 is implemented as follows:

(1) Structurally, the system mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine 8 is provided with a low-pressure steam channel communicated with the condenser 3, the condenser 3 is also provided with a condensate pipeline which is communicated with the second boiler 5 through a diffuser pipe 9 and the boiler 4, and then the second boiler 5 is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine 8; the external part is provided with a low-grade fuel channel which is communicated with the boiler 4, the external part is also provided with an air channel which is communicated with the boiler 4 through a heat source heat regenerator 6, and the boiler 4 is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator 6; the outside is also provided with a high-grade fuel channel which is communicated with a second boiler 5, the outside is also provided with an air channel which is communicated with the second boiler 5 through a second heat source heat regenerator 7 and a boiler 4, and the second boiler 5 is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator 7; the condenser 3 also has a cooling medium passage communicating with the outside.

(2) In the process, high-temperature and high-pressure steam generated by the second boiler 5 flows through the expansion speed increaser 8 to reduce the pressure, do work and increase the speed, low-pressure steam discharged by the expansion speed increaser 8 flows through the condenser 3 to release heat and condense, flows through the diffuser pipe 9 to reduce the speed and increase the pressure, flows through the boiler 4 and the second boiler 5 to gradually absorb heat and increase the temperature and vaporize, and then is supplied to the expansion speed increaser 8; the external low-grade fuel enters a boiler 4, external first path air enters the boiler 4 after absorbing heat and raising temperature through a heat source heat regenerator 6, the low-grade fuel and the air are mixed in the boiler 4 and are combusted into fuel gas with higher temperature, the fuel gas in the boiler 4 releases heat to the air and the circulating working medium flowing through the fuel gas and lowers the temperature, and then the fuel gas releases heat and lowers the temperature through the heat source heat regenerator 6 and is discharged to the outside; external high-grade fuel enters a second boiler 5, external second path air gradually absorbs heat and is heated after flowing through a second heat source heat regenerator 7 and a boiler 4, and then enters the second boiler 5, the high-grade fuel and the air are mixed and combusted in the second boiler 5 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 is cooled, and then the high-temperature fuel gas flows through the second heat source heat regenerator 7 to release heat, is cooled and is discharged outwards; the low-grade fuel and the high-grade fuel jointly provide driving heat load through the boiler 4 and the second boiler 5, the cooling medium takes away the low-temperature heat load through the condenser 3, and the work output by the expansion speed increaser 8 is provided to the outside to form a dual-fuel steam power device.

The dual fuel steam power plant shown in fig. 9 is implemented as follows:

(1) Structurally, in the dual-fuel steam power device shown in fig. 8, a heat regenerator and a newly added diffuser pipe are added, a condensate pipeline of a condenser 3 is communicated with the diffuser pipe 9 and adjusted to be communicated with the heat regenerator 10 through the newly added diffuser pipe B, a steam extraction channel of an expansion speed increaser 8 is communicated with the heat regenerator 10, and the heat regenerator 10 is communicated with the diffuser pipe 9 through the condensate pipeline.

(2) In terms of flow, the difference from the dual-fuel steam power plant shown in fig. 8 lies in: the high-temperature high-pressure steam entering the expansion speed increaser 8 is divided into two paths after reducing pressure and doing work to a certain degree, wherein the first path is provided for the heat regenerator 10, and the second path continues to reduce pressure, do work and increase speed and then enters the condenser 3; the condensate discharged by the condenser 3 flows through a newly added diffuser pipe B to reduce the speed and increase the pressure, then enters a heat regenerator 10, is mixed with the extracted steam from the expansion speed increaser 8, absorbs heat and increases the temperature, and the extracted steam releases heat to form condensate; the condensate of the heat regenerator 10 is supplied to the boiler 4 after flowing through the diffuser pipe 9 and being subjected to speed reduction and pressure increase, so that the dual-fuel steam power device is formed.

The dual fuel steam power plant shown in fig. 10 is implemented as follows:

(1) Structurally, in the dual-fuel steam power plant shown in fig. 5, a second heat source heat regenerator is eliminated, an external air channel is communicated with the boiler 4 through a heat source heat regenerator 6, and an external air channel is communicated with the second boiler 5 through a second heat source heat regenerator 7 and the boiler 4, and the two air channels are adjusted into two paths after being communicated with the heat source heat regenerator 6, wherein the first path is communicated with the boiler 4, and the second path is communicated with the second boiler 5 through the boiler 4; the gas channel of the second boiler 5 is communicated with the outside through a second heat source heat regenerator 7, and the gas channel of the second boiler 5 is adjusted to be communicated with the outside through a heat source heat regenerator 6.

(2) In the flow, the difference from the dual-fuel steam power plant shown in fig. 5 is that: the fuel gas discharged by the second boiler 5 is discharged to the outside after being discharged and cooled by flowing through the heat source heat regenerator 6, the external air is divided into two paths after being heated by flowing through the heat source heat regenerator 6, the first path enters the boiler 4, and the second path enters the second boiler 5 after being heated by flowing through the boiler 4, so that the dual-fuel steam power device is formed.

The effect that the technology of the invention can realize-the dual-fuel steam power device provided by the invention has the following effects and advantages:

(1) The irreversible loss of the temperature difference of the steam power system is reduced, and the heat efficiency is improved.

(2) The low-grade fuel is used as the high-grade fuel, and the utilization rate of converting the low-grade fuel into mechanical energy is obviously improved.

(3) The investment of high-grade fuel is directly reduced, and the utilization rate of converting the high-grade fuel into mechanical energy is improved.

(4) The emission of greenhouse gases and pollutants is reduced, and the energy-saving and emission-reducing benefits are outstanding.

(5) The structure is simple, the flow is reasonable, and the application is wide; the fuel use value is improved, and the system operation cost is reduced.

Claims

1. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel to be communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline to be communicated with the second boiler (5) through the booster pump (2), and then the second boiler (5) is also provided with a high-pressure steam channel to be communicated with the steam turbine (1); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

2. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate liquid pipeline which is communicated with the second boiler (5) through the booster pump (2), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheat steam channel which is communicated with the steam turbine (1) through the boiler (4); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

3. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through the booster pump (2), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheat steam channel communicated with the steam turbine (1) through the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

4. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through the booster pump (2), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheat steam channel which is communicated with the steam turbine (1) through the boiler (4) and the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

5. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel to be communicated with the condenser (3), the condenser (3) is also provided with a condensate liquid pipeline to be communicated with the second boiler (5) through the booster pump (2) and the boiler (4), and then the second boiler (5) is also provided with a high-pressure steam channel to be communicated with the steam turbine (1); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

6. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel to be communicated with the condenser (3), the condenser (3) is also provided with a condensate liquid pipeline to be communicated with the second boiler (5) through the booster pump (2) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel to be communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheat steam channel to be communicated with the steam turbine (1) through the boiler (4); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

7. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through the booster pump (2) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheat steam channel communicated with the steam turbine (1) through the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

8. The dual-fuel steam power device mainly comprises a steam turbine, a booster pump, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the steam turbine (1) is provided with a low-pressure steam channel to be communicated with the condenser (3), the condenser (3) is also provided with a condensate liquid pipeline to be communicated with the second boiler (5) through the booster pump (2) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel to be communicated with the steam turbine (1), and the steam turbine (1) is also provided with a reheating steam channel to be communicated with the steam turbine (1) through the boiler (4) and the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device; wherein, or the steam turbine (1) is connected with the booster pump (2) and transmits power.

9. A dual-fuel steam power device is characterized in that a heat regenerator and a newly added booster pump are added in any one of the dual-fuel steam power devices in claims 1-8, a condenser (3) is provided with a condensate pipeline which is communicated with the booster pump (2) and adjusted to be that the condenser (3) is provided with a condensate pipeline which is communicated with the heat regenerator (10) through the newly added booster pump (A), a steam extraction channel of a steam turbine (1) is communicated with the heat regenerator (10), and the heat regenerator (10) is provided with a condensate pipeline which is communicated with the booster pump (2), so that the dual-fuel steam power device is formed.

10. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9), and then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

11. The dual-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheat steam channel which is communicated with the expansion speed increasing machine through the boiler (4); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

12. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheat steam channel which is communicated with the expansion speed increasing machine through the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

13. The dual-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheating steam channel which is communicated with the expansion speed increasing machine through the boiler (4) and the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

14. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increaser (8) is provided with a low-pressure steam channel which is communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9) and the boiler (4), and then the second boiler (5) is provided with a high-pressure steam channel which is communicated with the expansion speed increaser (8); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

15. The dual-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel which is communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel which is communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheat steam channel which is communicated with the expansion speed increasing machine (8) through the boiler (4); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

16. The dual-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheat steam channel communicated with the expansion speed increasing machine through the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

17. The double-fuel steam power device mainly comprises an expansion speed increaser, a diffuser pipe, a condenser, a boiler, a second boiler, a heat source heat regenerator and a second heat source heat regenerator; the expansion speed increasing machine (8) is provided with a low-pressure steam channel communicated with the condenser (3), the condenser (3) is also provided with a condensate pipeline which is communicated with the second boiler (5) through a diffuser pipe (9) and the boiler (4), then the second boiler (5) is also provided with a high-pressure steam channel communicated with the expansion speed increasing machine (8), and the expansion speed increasing machine (8) is also provided with a reheat steam channel which is communicated with the expansion speed increasing machine through the boiler (4) and the second boiler (5); the external part is provided with a low-grade fuel channel which is communicated with the boiler (4), the external part is also provided with an air channel which is communicated with the boiler (4) through a heat source heat regenerator (6), and the boiler (4) is also provided with a fuel gas channel which is communicated with the external part through the heat source heat regenerator (6); the outside is also provided with a high-grade fuel channel which is communicated with a second boiler (5), the outside is also provided with an air channel which is communicated with the second boiler (5) through a second heat source heat regenerator (7) and a boiler (4), and the second boiler (5) is also provided with a fuel gas channel which is communicated with the outside through the second heat source heat regenerator (7); the condenser (3) is also provided with a cooling medium channel which is communicated with the outside to form a dual-fuel steam power device.

18. A dual-fuel steam power device is characterized in that a heat regenerator and a newly added diffuser pipe are added in any dual-fuel steam power device of claims 10-17, a condenser (3) is communicated with the diffuser pipe (9) and adjusted to be communicated with the condenser (3) through a condensate pipeline and the heat regenerator (10) through the newly added diffuser pipe (B), an expansion speed increaser (8) is provided with a steam extraction channel to be communicated with the heat regenerator (10), and the heat regenerator (10) is communicated with the diffuser pipe (9) through the condensate pipeline to form the dual-fuel steam power device.

19. A dual-fuel steam power device is characterized in that in any one of the dual-fuel steam power devices of claims 1 to 18, a second heat source heat regenerator is omitted, an external air channel is communicated with a boiler (4) through a heat source heat regenerator (6), and the external air channel is communicated with a second boiler (5) through a second heat source heat regenerator (7) and the boiler (4), and is adjusted into two paths after the external air channel is communicated with the heat source heat regenerator (6), wherein the first path is communicated with the boiler (4), and the second path is communicated with the second boiler (5) through the boiler (4); and the gas channel of the second boiler (5) is communicated with the outside through a second heat source heat regenerator (7) and adjusted to be communicated with the outside through a heat source heat regenerator (6) to form the dual-fuel steam power device.