A system for coupling compressed air to a biomass power generator

Abstract

The application discloses a system for coupling compressed air and a biomass generator set, which comprises a low-pressure compressor, an intermediate cooler, a high-pressure compressor, a cooler, a combustion chamber, a compressor, a gasification furnace, a biomass input pipeline and a power generation system; the outlet of the low-pressure compressor is connected with the inlet of the high-pressure compressor through the tube side of the intermediate cooler; the outlet of the high-pressure compressor is connected with the inlet of the combustion chamber through the tube side of the cooler; the outlet of the compressor is connected with the inlet of the gasification furnace through the shell side of the intermediate cooler and the shell side of the cooler; the outlet of the gasification furnace is connected with the inlet of the combustion chamber; the biomass input pipeline is connected with the biomass inlet of the gasification furnace; and the outlet of the combustion chamber is connected with the power generation system. The system can realize the coupling of compressed air and the biomass generator set, realize the waste heat recovery of the compressor and reduce the emission of greenhouse gases.

Description

TECHNICAL FIELD

[0001] The present application relates to a power generation system, in particular to a system coupling compressed air and a biomass generator set. BACKGROUND

[0002] In recent years, the global electricity production based on renewable energy sources such as wind and solar energy has grown dramatically. According to the current energy scenario, it is expected that this growth trend will continue in the near future. In 2014, non-hydropower renewable energy sources contributed 6% to the global electricity production, and by 2025, their expected contribution could be between 12% and 18%, depending on the policy scenario considered. On the other hand, the intermittent nature of solar and wind energy makes energy storage technology an inevitable requirement to improve the flexibility and efficiency of the energy system. The dispersion of these resources will affect the stability of the grid, and after that, the load balancing problem will begin to appear. Therefore, renewable energy sources cannot completely replace traditional energy systems without the use of effective energy storage systems. Energy storage technologies include pumped storage, thermal storage, compressed air storage, flywheels, supercapacitors, superconducting magnetic storage, batteries, hydrogen storage, and many other technologies. Pumped storage is still the most common large-scale energy storage technology, but its share of global installed capacity has fallen from 99% to 96.2% in 2018; at the same time, the scarcity of water resources and specific geographical conditions limit their application. Compared with other energy storage technologies, compressed air energy storage technology has the advantages of large energy storage capacity, long energy storage period, long service life, and green environmental protection, and is a new type of energy storage technology with great development potential.

[0003] Compressed air energy storage is an energy storage technology that can achieve low-carbon, pollution-free, and green environmental protection of the unit, and effectively improve the economic and ecological relationship. In recent years, it has also received extensive attention from domestic and foreign scientific research institutions. At present, there is no related public patent for coupling compressed air and a biomass generator set to solve the waste heat recovery of the compressor and reduce greenhouse gas emissions. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a system coupling compressed air and a biomass generator set, which can realize the coupling of compressed air and a biomass generator set, realize the waste heat recovery of the compressor, and reduce greenhouse gas emissions.

[0005] To achieve the above-mentioned purpose, the system coupling compressed air and a biomass generator set according to the present application comprises a low-pressure compressor, an intercooler, a high-pressure compressor, a cooler, a combustion chamber, a compressor, a gasification furnace, a biomass input pipeline, and a power generation system.

[0006] The outlet of the low-pressure compressor is connected to the inlet of the high-pressure compressor through the tube side of the intercooler, and the outlet of the high-pressure compressor is connected to the inlet of the combustion chamber through the tube side of the cooler.

[0007] The outlet of the compressor is connected to the inlet of the gasifier via the shell side of the intercooler and the shell side of the cooler, the outlet of the gasifier is connected to the inlet of the combustion chamber, and the biomass input pipeline is connected to the biomass inlet of the gasifier; the outlet of the combustion chamber is connected to the power generation system.

[0008] The power generation system comprises a high-pressure turbine, a medium-pressure turbine, a low-pressure turbine, an evaporator and a chimney.

[0009] The outlet of the combustion chamber is connected to the inlet of the high-pressure turbine, the outlet of the high-pressure turbine is connected to the inlet of the medium-pressure turbine, the outlet of the medium-pressure turbine is connected to the inlet of the low-pressure turbine, and the outlet of the low-pressure turbine is connected to the chimney via the heat-releasing side of the evaporator.

[0010] The motor system comprises a first generator and a motor, wherein the motor is coaxially arranged with the high-pressure compressor and the low-pressure compressor, and the first generator is coaxially arranged with the high-pressure turbine, the medium-pressure turbine and the low-pressure turbine.

[0011] The system further comprises a feedwater pipeline, an evaporator, a small turbine and a second generator.

[0012] The outlet of the feedwater pipeline is connected to the inlet of the heat-absorbing side of the evaporator, the outlet of the heat-absorbing side of the evaporator is connected to the inlet of the small turbine, and the small turbine is connected to the second generator.

[0013] The outlet of the feedwater pipeline is connected to the inlet of the heat-absorbing side of the evaporator via a feedwater pump.

[0014] The system further comprises an air storage chamber, wherein the inlet of the air storage chamber is connected to the pipeline between the combustion chamber and the tube side of the cooler, and the outlet of the air storage chamber is connected to the pipeline between the combustion chamber and the tube side of the cooler.

[0015] The inlet of the air storage chamber is connected to the pipeline between the combustion chamber and the tube side of the cooler via an air storage chamber inlet valve.

[0016] The outlet of the air storage chamber is connected to the pipeline between the combustion chamber and the tube side of the cooler via an air storage chamber outlet valve.

[0017] The present application has the following beneficial effects:

[0018] The compressed air and biomass generator set coupling system disclosed by the application is characterized in that: an intermediate cooler is arranged between the low-pressure compressor and the high-pressure compressor, the outlet of the high-pressure compressor is connected with the inlet of the combustion chamber through the pipe side of the cooler, and the air output by the compressor is heated in the intermediate cooler and the cooler and then sent into the gasification furnace, so that the compressed air and the biomass generator set are coupled, the waste heat of the compressor is recycled, the emission of greenhouse gases is reduced, the structure is simple, the operation is convenient, and the practicability is extremely high. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural diagram of the application.

[0020] 1 is a high-pressure compressor, 2 is a low-pressure compressor, 3 is an intermediate cooler, 4 is a cooler, 5 is a compressor, 6 is a gasification furnace, 7 is a gas storage chamber, 8 is an electric machine system, 9 is a high-pressure turbine, 10 is a medium-pressure turbine, 11 is a low-pressure turbine, 12 is a feed pump, 13 is an evaporator, 14 is a combustion chamber, 15 is a generator, 16 is a small steam turbine, 17 is a chimney, 18 is a gas storage chamber inlet valve, and 19 is a gas storage chamber outlet valve. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0022] The structural schematic diagram according to the disclosed embodiments of the present application is shown in the drawings. These drawings are not drawn to scale, in which some details are exaggerated for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and the regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0023] REFERENCE Figure 1The system for coupling compressed air and a biomass generator set comprises a high-pressure compressor 1, a low-pressure compressor 2, an intercooler 3, a cooler 4, a compressor 5, a gasification furnace 6, an air storage chamber 7, a motor system 8, a high-pressure turbine 9, a medium-pressure turbine 10, a low-pressure turbine 11, a feedwater pump 12, an evaporator 13, a combustion chamber 14, a generator 15, a small steam turbine 16, a chimney 17, an air storage chamber inlet valve 18 and an air storage chamber outlet valve 19.

[0024] The outlet of the low-pressure compressor 2 is connected to the inlet of the high-pressure compressor 1 through the tube side of the intercooler 3, and the outlet of the high-pressure compressor 1 is connected to the inlet of the combustion chamber 14 through the tube side of the cooler 4.

[0025] The outlet of the compressor 5 is connected to the inlet of the gasification furnace 6 through the shell side of the intercooler 3 and the shell side of the cooler 4, the outlet of the gasification furnace 6 is connected to the inlet of the combustion chamber 14, and a biomass input pipeline is connected to the biomass inlet of the gasification furnace 6.

[0026] The outlet of the combustion chamber 14 is connected to the inlet of the high-pressure turbine 9, the outlet of the high-pressure turbine 9 is connected to the inlet of the medium-pressure turbine 10, the outlet of the medium-pressure turbine 10 is connected to the inlet of the low-pressure turbine 11, and the outlet of the low-pressure turbine 11 is connected to the chimney 17 through the heat releasing side of the evaporator 13.

[0027] The outlet of the feedwater pipeline is connected to the heat absorbing side inlet of the evaporator 13 through the feedwater pump 12, the heat absorbing side outlet of the evaporator 13 is connected to the inlet of the small steam turbine 16, and the small steam turbine 16 is connected to the second generator 15.

[0028] The motor system 8 comprises a first generator and a motor, wherein the motor is coaxially arranged with the high-pressure compressor 1 and the low-pressure compressor 2, and the first generator is coaxially arranged with the high-pressure turbine 9, the medium-pressure turbine 10 and the low-pressure turbine 11.

[0029] Further, the application further comprises the air storage chamber 7, the air storage chamber inlet valve 18 and the air storage chamber outlet valve 19, wherein the inlet of the air storage chamber 7 is connected to the pipeline between the combustion chamber 14 and the tube side of the cooler 4 through the air storage chamber inlet valve 18, and the outlet of the air storage chamber 7 is connected to the pipeline between the combustion chamber 14 and the tube side of the cooler 4 through the air storage chamber outlet valve 19.

[0030] The working process of the application is as follows:

[0031] Air is compressed by the low-pressure compressor 2, enters the tube side of the intercooler 3 to release heat and reduce temperature, then enters the high-pressure compressor 1 for compression, and then enters the combustion chamber 14 after being cooled by the tube side of the cooler 4;

[0032] The air compressed by the compressor 5 enters into the shell side of the intercooler 3 to absorb heat, and then enters into the gasifier 6 to absorb heat in the shell side of the cooler 4, and the biomass enters into the gasifier 6 to be gasified, the gasification product of the gasifier 6 enters into the combustion chamber 14 to be combusted, the flue gas generated by the combustion chamber 14 enters into the high-pressure turbine 9, the medium-pressure turbine 10 and the low-pressure turbine 11 in turn, and then is discharged from the chimney 17 after absorbing heat in the heat releasing side of the evaporator 13, and the high-pressure turbine 9, the medium-pressure turbine 10 and the low-pressure turbine 11 drive the first generator to generate electricity;

[0033] The feed water output by the feed water pipeline absorbs heat in the heat absorbing side of the evaporator 13 to generate steam, and then is sent into the small turbine 16 to drive the second generator 15 to work.

[0034] In this process, the high-pressure compressor 1, the low-pressure compressor 2 and the compressor 5 are driven to compress air by consuming the power available in the power grid, and the heat energy generated in the two-stage compression process is absorbed by the intercooler 3 and the cooler 4.

[0035] After the high-pressure and high-temperature compressed air leaves the cooler 4, part of the air enters into the combustion chamber 14, and part of the air is stored in the air storage chamber 7 to be mixed with the gas generated by the gasifier 6.

[0036] The biomass is supplied to the gasifier 6 to generate gas in the gasification process and flow into the combustion chamber 14.

[0037] In addition, the power station operates in three different scenarios, namely, charging, storage and discharging stages. During the charging period (8 hours), the high-temperature and high-pressure air after leaving the cooler 4 is divided into two air flows, one of which is stored in the air storage chamber 7 and the other of which enters into the combustion chamber 14, and the air stored in the air storage chamber 7 is used during the discharging period, which in turn leads to more power generated during the discharging period.

[0038] The biomass power generation system converts various low-calorific-value solid biomass energy resources into biomass gas through gasification, and the biomass energy resources can be agricultural and forestry wastes or household organic garbage. The present application continuously operates by using the air storage chamber 7, and compared with the traditional system based on fossil fuels, the present application is more beneficial to the environment and reduces greenhouse gas emissions, and eliminates the dependence on fossil fuels.

[0039] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A system for coupling compressed air with a biomass generator set, characterized in that, It includes a low-pressure compressor (2), an intercooler (3), a high-pressure compressor (1), a cooler (4), a combustion chamber (14), a compressor (5), a gasifier (6), a biomass input pipeline, and a power generation system; The outlet of the low-pressure compressor (2) is connected to the inlet of the high-pressure compressor (1) via the pipe side of the intercooler (3), and the outlet of the high-pressure compressor (1) is connected to the inlet of the combustion chamber (14) via the pipe side of the cooler (4). The outlet of the compressor (5) is connected to the inlet of the gasifier (6) after passing through the shell side of the intercooler (3) and the shell side of the cooler (4). The outlet of the gasifier (6) is connected to the inlet of the combustion chamber (14). The biomass input pipe is connected to the biomass inlet of the gasifier (6). The outlet of the combustion chamber (14) is connected to the power generation system. It also includes a gas storage chamber (7), wherein the inlet of the gas storage chamber (7) is connected to the pipe between the combustion chamber (14) and the cooler (4), and the outlet of the gas storage chamber (7) is connected to the pipe between the combustion chamber (14) and the cooler (4). The inlet of the gas storage chamber (7) is connected to the pipe between the combustion chamber (14) and the cooler (4) via the gas storage chamber inlet valve (18); The outlet of the gas storage chamber (7) is connected to the pipeline between the combustion chamber (14) and the cooler (4) via the gas storage chamber outlet valve (19); The power generation system includes a high-pressure turbine (9), a medium-pressure turbine (10), a low-pressure turbine (11), an evaporator (13), and a chimney (17). The outlet of the combustion chamber (14) is connected to the inlet of the high-pressure turbine (9), the outlet of the high-pressure turbine (9) is connected to the inlet of the intermediate-pressure turbine (10), the outlet of the intermediate-pressure turbine (10) is connected to the inlet of the low-pressure turbine (11), and the outlet of the low-pressure turbine (11) is connected to the chimney (17) via the heat release side of the evaporator (13). It also includes an electric motor system (8); the electric motor system (8) includes a first generator and an electric motor, wherein the electric motor is arranged coaxially with the high-pressure compressor (1) and the low-pressure compressor (2), and the first generator is arranged coaxially with the high-pressure turbine (9), the medium-pressure turbine (10) and the low-pressure turbine (11); It also includes water supply pipes, evaporator (13), small steam turbine (16) and second generator (15); The outlet of the water supply pipe is connected to the heat absorption side inlet of the evaporator (13), the heat absorption side outlet of the evaporator (13) is connected to the inlet of the small steam turbine (16), and the small steam turbine (16) is connected to the second generator (15). The outlet of the water supply pipe is connected to the heat absorption side inlet of the evaporator (13) via the water supply pump (12).

Images