CN116006324A - Biomass gasification power generation system - Google Patents

Abstract

The specification discloses a biomass gasification power generation system, comprising: a biomass preheater; a biomass gasifier; the solar focusing mechanism is used for gathering solar radiation and providing heat for biomass gasification reaction so as to generate synthesis gas; the cyclone dust collector is communicated with the biomass gasification furnace; the first heat exchanger is communicated with the cyclone dust collector; the gas-liquid separator is communicated with the first heat exchanger; the combustion chamber is communicated with the gas-liquid separator; the gas turbine is used for generating power by using the gas; the third heat exchanger is communicated with the gas turbine; the waste heat boiler is communicated with the third heat exchanger; the first circulation loop is formed between the first heat exchanger and the biomass preheater; the branch circuit is arranged on the first circulation loop; and the second circulation loop is formed between the third heat exchanger and the combustion chamber. The power generation system can utilize concentrated solar energy to replace biomass combustion to provide gasification reaction heat, and reasonably and fully utilize waste heat resources of synthesis gas and flue gas.

Description

Biomass gasification power generation system

technical field

The present application relates to the technical field of biomass gasification, in particular to a biomass gasification power generation system.

Background technique

Compared with traditional energy, new energy has the characteristics of less pollution and large reserves, and it plays an important role in solving the problems of serious environmental pollution and resource depletion in today's world. Among them, solar energy and biomass energy are considered as potential alternative energy sources for fossil fuels due to their unique advantages, and their efficient and clean utilization technologies have attracted widespread attention.

Biomass gasification technology converts biomass with low energy density into easy-to-use syngas, which transfers the chemical energy of the fuel to the syngas and improves the utilization efficiency of gas. The conventional biomass gasification technology burns part of the biomass fuel to provide the heat required for the gasification reaction, and usually consumes about 30% of the biomass raw material, which not only makes the effective utilization of biomass low, but also makes the by-product of syngas Increase, decrease synthesis gas calorific value and purity.

In the existing biomass gasification power generation system, the biomass and gasification agent (air and steam) are first passed into the gasification furnace to undergo gasification reaction and generate high-temperature syngas, which are passed into the cyclone dust collector and separator to Fly ash and water are separated, and the separated syngas and compressed air are passed into the combustion chamber for combustion, and the high-temperature gas generated is passed into the gas turbine for power generation, and finally the flue gas of the turbine is discharged into the air .

However, the main problems of the biomass gasification power generation system in the existing design implementation are:

1) The reaction heat of biomass gasification is obtained by burning biomass raw materials, which reduces the effective utilization rate of biomass, and the concentration of CO ₂ in by-products is high, which reduces the calorific value and purity of syngas;

2) The potential energy utilization of synthesis gas and waste heat of flue gas is not sufficient enough, so that the energy utilization rate of the system is not high, and the comprehensive cascade utilization of heat energy has not been realized;

3) The biomass gasification power generation system uses biomass as the main raw material, and the use of renewable energy is single, without considering the flexibility of the system, and there is no real meaning to realize multi-energy complementarity and deep application;

4) The output product of the biomass gasification power generation system is electricity, which cannot meet the diversity of end-user needs.

Contents of the invention

In order to solve at least one technical problem existing in the prior art, this application provides a biomass gasification power generation system, which couples solar energy with the biomass gasification system, so that solar energy can replace biomass combustion to provide heat for the gasification reaction, In addition, the waste heat resources of synthesis gas and flue gas can be reasonably and fully utilized, and the energy utilization rate of the system can be improved.

In order to achieve the above object, the technical solution provided by the application is as follows:

A biomass gasification power generation system, the system comprising:

Biomass preheater for preheating biomass;

A biomass gasifier, connected to the biomass preheater, is used for biomass, steam and air to participate in the gasification reaction;

The solar energy focusing mechanism is used to gather solar radiation to provide heat for the biomass gasification reaction to generate syngas;

A cyclone dust collector, which is connected with the biomass gasifier, is used to remove fly ash generated during the gasification reaction;

The first heat exchanger is connected with the cyclone dust collector, and is used for exchanging heat between the syngas and water to cool the syngas;

a gas-liquid separator, communicated with the first heat exchanger, for removing moisture in the cooled syngas;

a combustion chamber, which communicates with the gas-liquid separator, and is used to mix and combust the synthesis gas and air to generate gas;

A gas turbine, used to use the gas to generate power and generate flue gas;

A first circulation loop, formed between the first heat exchanger and the biomass preheater, for providing first preheated steam to the biomass preheater;

The branch circuit is arranged on the first circulation circuit and is used for supplying the gasifying agent for the biomass gasification furnace.

As a preferred embodiment, the syngas and water are exchanged to generate cooled syngas and second preheated steam, and the first heat exchanger has: a water inlet for passing in water, used for the The first water outlet for discharging the second preheated steam and the cooling outlet for cooling the syngas discharge, the cooling outlet is connected to the gas-liquid separator, and the first water outlet is arranged on the first circulation loop .

As a preferred embodiment, the first circulation loop is sequentially arranged between the first water outlet and the biomass preheater along the direction from upstream to downstream: a liquid splitter and a second heat exchanger The second heat exchanger is used to exchange heat between the air and the second preheated steam to generate the first preheated steam and preheated air, and the liquid flow divider is connected to the first water outlet The liquid inlet through which is connected, and a first split port and a second split port, the first split port is used to introduce the second preheated steam into the second heat exchanger, and the second split port is used for The second preheated steam is introduced into the biomass gasifier.

As a preferred embodiment, the gasification agent includes: preheated air and second preheated steam, and the second heat exchanger has: a first air inlet for passing in air for the first A second water outlet through which the preheated steam is discharged and a discharge port through which the preheated air is discharged, and the second water outlet is connected with the biomass preheater.

As a preferred implementation, the power generation system includes: a flow controller for group flow control of the gasification agent, the flow controller is connected to the bottom of the biomass gasifier; The flow controller includes: an air flow controller and a steam flow controller, the air flow controller is arranged between the outlet and the biomass gasifier, and the steam flow controller is arranged in the second Between the split port and the biomass gasifier.

As a preferred embodiment, the power generation system further includes: a third heat exchanger, connected to the gas turbine, for exchanging heat between air and flue gas to generate cooling flue gas and heating air; A secondary circulation loop, formed between the third heat exchanger and the combustion chamber, for supplying the heated air to the combustion chamber; a waste heat boiler, connected with the third heat exchanger, for recovering The residual heat of the cooling flue gas.

As a preferred embodiment, the solar energy focusing mechanism includes: a heliostat, a parabolic concentrator, and a focal plane, wherein the heliostat is used to reflect solar radiation to the parabolic concentrator, and then pass through the parabolic concentrator Converging light to the focal plane for heat collection, the focal plane is set on the biomass gasification furnace to provide reaction heat for biomass gasification.

As a preferred embodiment, the biomass preheater adopts a dividing wall heat exchanger, which has a heating interlayer for preheating the biomass, and the heating interlayer is connected to the second outlet of the second heat exchanger. The mouth of the water is connected.

As a preferred implementation manner, the branch includes: a first branch and a second branch, the first branch is formed between the second branch port and the steam flow controller, the A second branch is formed between the outlet and the air flow controller, the first preheated steam has a first preset temperature, the second preheated steam has a second preset temperature, the The first preset temperature is lower than the second preset temperature.

As a preferred embodiment, the third heat exchanger has: a second air inlet for passing in air, a flue gas inlet for passing in flue gas, and a cooling flue gas inlet for cooling flue gas discharged. The gas outlet and the heated air outlet discharged through the heated air, the flue gas inlet is connected with the gas turbine, the cooling flue gas outlet is connected with the waste heat boiler, and the second circulation loop is set in the Between the heated air outlet and the combustion chamber.

As a preferred embodiment, the system includes: a compressor connected to the second air inlet for providing compressed air to the third heat exchanger to meet the pressure of the combustion chamber Requirements: The fly ash bin is connected with the cyclone dust collector and is used to collect the separated fly ash particles.

Beneficial effect:

The biomass gasification power generation system provided by this application converts biomass with low energy density into high-quality electric energy, uses concentrated solar energy to replace biomass combustion to provide gasification reaction heat, and converts solar energy into chemical energy of syngas to enhance solar energy Grade and application flexibility, solve the problems of solar discontinuity and instability, promote the complementary application of solar energy and biomass energy, and realize efficient and stable energy conversion.

In the biomass gasification power generation system provided by this application, the gasification agent can be injected from the bottom of the biomass gasification furnace, and the biomass particles can be pushed to the top of the biomass gasification furnace to fully absorb concentrated solar energy and strengthen the relationship between biomass and gasification. The mixing degree of the agent, and the flow control of the gasification agent in groups, and the biomass gasification capacity can be controlled by adjusting the flow rate of the gasification agent.

The biomass gasification power generation system provided by this application can make full use of the waste heat resources of the syngas to provide the first preheated steam to the biomass preheater to preheat the biomass, and provide gasification agent to the biomass gasifier, which improves the The energy recycling rate of the system. In addition, it can also make full use of the waste heat resources of the exhaust gas at the outlet of the gas turbine, part of which is used to provide heated air to the combustion chamber to meet the temperature requirements of the combustion chamber, and improve power generation efficiency without increasing energy consumption; In the waste heat boiler, waste heat is recovered to generate steam, which realizes product diversification and comprehensive cascade utilization of waste heat resources of different grades.

With reference to the following description and accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not limited thereby in scope.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. For those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is a schematic structural diagram of a biomass gasification power generation system provided in an embodiment of this specification.

Explanation of reference signs:

1. Biomass preheater; 2. Biomass gasifier; 3. Heliostat; 4. Parabolic condenser; 5. Focal plane; 6. Steam flow controller; 7. Air flow controller; 8. Cyclone dust removal 9. Fly ash bin; 10. First heat exchanger; 11. Liquid splitter; 12. Second heat exchanger; 13. Gas-liquid separator; 14. Combustion chamber; 15. Gas turbine; 16. 17. Compressor; 18. Waste heat boiler; 19. First circulation loop; 191. First branch; 192. Second branch; 20. Second circulation loop.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope. After reading the present invention, those skilled in the art will understand the present invention Modifications of various equivalent forms fall within the scope defined in the present application.

It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The biomass gasification power generation system of the embodiment of this specification will be explained and described below in conjunction with FIG. 1 .

This specification provides a biomass gasification power generation system, the system includes: a biomass preheater 1 for preheating biomass; a biomass gasifier 2, the biomass gasifier 2 and the The biomass preheater 1 is connected; the solar focusing mechanism is used to gather solar radiation to provide heat for the biomass gasification reaction to generate syngas; the cyclone dust collector 8 is connected to the biomass gasifier 2 for Removing the fly ash produced in the gasification reaction process; the first heat exchanger 10, communicated with the cyclone dust collector 8, is used to exchange heat between the syngas and water to cool the syngas; the gas-liquid separator 13, It communicates with the first heat exchanger 10 and is used to remove moisture in the cooled syngas; the combustion chamber 14 communicates with the gas-liquid separator 13 and is used to mix and burn the syngas with air Generate gas; gas turbine 15, used to use the gas to generate power and generate flue gas; a first circulation loop 19, formed between the first heat exchanger 10 and the biomass preheater 1, used The first preheating steam is provided to the biomass preheater 1; the branch circuit is arranged on the first circulation loop 19, and is used to provide the gasification agent for the biomass gasifier.

The biomass gasification furnace 2 is used for the preheated biomass and gasification agent to participate in the gasification reaction to generate syngas. The cyclone dust collector 8 is connected with a fly ash bin 9, and the fly ash bin 9 is used to collect separated fly ash particles, thereby avoiding blockage of subsequent equipment. The first circulation loop 19 and its branches can make full use of the waste heat resources of the syngas to provide the first preheated steam to the biomass preheater 1 to preheat the biomass, and to provide the gasification agent to the flow controllers 6 and 7, The energy recycling rate of the system is improved.

In this specification, the syngas is exchanged with water to generate cooled syngas and second preheated steam, and the first heat exchanger 10 has: a water inlet for passing in water for the second preheating The first water outlet for steam discharge and the cooling outlet for cooling the syngas discharge, the cooling outlet is connected to the gas-liquid separator 13 , and the first water outlet is arranged on the first circulation loop 19 . Specifically, after water and syngas exchange heat through the first heat exchanger 10, the temperature of the water increases to generate second preheated steam, the temperature of the syngas decreases to generate cooled syngas, and the cooled syngas enters gas-liquid separation 13 to enter the subsequent process steps, while the second preheated steam enters the first circulation loop 19.

In this specification, the first circulation loop 19 is provided sequentially along the direction from upstream to downstream between the first water outlet and the biomass preheater 1: a liquid splitter 11 and a second heat exchanger device 12, the second heat exchanger 12 is used to exchange heat between air and the second preheated steam to generate first preheated steam and preheated air, and the liquid splitter 11 has a The liquid inlet connected to the water port, and a first split port and a second split port, the first split port is used to introduce the second preheated steam into the second heat exchanger 12, and the second split port The port is used to introduce the second preheated steam into the biomass gasifier 2 .

Specifically, after the second preheated steam enters the liquid inlet of the liquid splitter 11, it is divided into two parts through the first split port and the second split port, and one part enters the second heat exchanger 12 to continue heat exchange to generate the first preheated steam , so that it can be used as the heat source of the biomass preheater 1, and the other part enters the steam flow controller 6 to provide the second preheating steam to the steam flow controller 6.

The gasifying agent includes: preheated air and second preheated steam, and the second heat exchanger 12 has: a first air inlet for introducing air, and a second air inlet for discharging the first preheated steam. Two water outlets and a discharge outlet through which the preheated air is discharged, and the second water outlet is connected with the biomass preheater 1 .

Further, the power generation system includes: a flow controller for group flow control of the gasification agent, the flow controller is connected to the bottom of the biomass gasifier 2; the flow controller includes : an air flow controller 7 and a steam flow controller 6, the air flow controller 7 is arranged between the outlet and the biomass gasifier 2, and the steam flow controller 6 is arranged at the second Between the two split ports and the biomass gasifier 2 .

In this embodiment, the flow controller can control the flow rate of the gasification agent in groups to reasonably adjust the biomass gasification capacity. The steam flow controller 6 is connected to the bottom inlet of the biomass gasifier 2 to control the flow of steam gasification agent; the air flow controller 7 is connected to the bottom inlet of the biomass gasifier 2, Control air vaporizer flow. The steam flow controller 6 and the air flow controller 7 control the biomass gasification capacity by adjusting the gasification agent flow, and at the same time push the biomass particles to the top of the biomass gasification furnace 2 to fully absorb concentrated solar energy.

In this specification, the biomass preheater 1 adopts a dividing wall heat exchanger, which has a heating interlayer for preheating the biomass, and the heating interlayer and the second water outlet of the second heat exchanger 12 connected.

After the air and the second preheated steam pass through the second heat exchanger 12 for heat exchange, the temperature of the air increases to generate preheated air, the temperature of the second preheated steam decreases to generate first preheated steam, and the first preheated steam The steam enters the heating interlayer of the biomass preheater 1 through the second water outlet to preheat the biomass raw material, and the preheated air enters the air flow controller 7 through the outlet. Therefore, the second heat exchanger 12 can not only be used to preheat the air with the second preheated steam at the outlet of the first heat exchanger 10, and provide gasification agent for the gasification reaction together with the second preheated steam; Substance preheater 1 provides first preheated steam.

Further, the branch includes: a first branch 191 and a second branch 192, the first branch 191 is formed between the second branch port and the steam flow controller 6, the first branch Two branches 192 are formed between the outlet and the air flow controller 7, the first preheated steam has a first preset temperature, and the second preheated steam has a second preset temperature, so The first preset temperature is lower than the second preset temperature. The first preset temperature and the second preset temperature are not limited in this application, for example, the first preset temperature may be 300°C, and the second preset temperature may be 500°C.

In this specification, the solar energy focusing mechanism includes: a heliostat 3, a parabolic concentrator 4 and a focal plane 5; wherein the heliostat 3 is used to reflect solar radiation to the parabolic concentrator 4, and then pass The parabolic concentrator 4 converges light to the focal plane 5 for heat collection, and the focal plane 5 is set on the biomass gasification furnace 2 to provide reaction heat for biomass gasification. Specifically, the parabolic concentrator 4 can be located above the biomass gasifier 2 for concentrating the solar radiation reflected by the heliostat 3; the focal plane 5 can be located above the biomass gasifier 2 The plane is used to absorb solar radiation and provide heat for the gasification reaction.

Further, the system includes: a third heat exchanger 16 and a waste heat boiler 18, the third heat exchanger 16 is connected to the gas turbine 15, and is used to exchange heat between air and the flue gas to generate cooling flue gas and heating air; the third heat exchanger 16 has: a second air inlet for passing in air, a flue gas inlet for passing in flue gas, and a cooling flue gas for discharging the cooling flue gas outlet and the heated air outlet discharged through the heated air, the flue gas inlet is connected to the gas turbine 15, the cooling flue gas outlet is connected to the waste heat boiler 18, and the waste heat boiler 18 is used to recover all Describe the waste heat of cooling flue gas.

Specifically, the air and flue gas are exchanged by the third heat exchanger 16 to form cooling flue gas and heated air, and the cooling flue gas enters the waste heat boiler 18 to continue recovering the remaining heat. The waste heat boiler 18 will generate steam and a small amount of flue gas. Compared with the method of directly discharging flue gas from the gas turbine, the pollution to the environment can be reduced, and at the same time, the steam provided by the waste heat boiler 18 can meet the heat demand of users.

Further, the system further includes: a second circulation loop 20, the second circulation loop 20 is arranged between the heating air outlet and the combustion chamber 14, and is used to provide heating air to the combustion chamber 14, To meet the temperature requirements of the combustion chamber 14. The system further includes: a compressor 17 connected to the second air inlet for providing compressed air to the third heat exchanger 16 to meet the pressure requirement of the combustion chamber.

The biomass gasification power generation system provided in the embodiments of this specification reasonably and fully utilizes waste heat resources of synthesis gas and flue gas through multiple heat exchangers, thereby improving the energy utilization rate of the system. In order to better understand the biomass gasification power generation system provided by the embodiment of this specification, the following will introduce the process flow of this system in detail in combination with a specific application environment:

The biomass raw material is preheated by the first preheating steam at 300°C in the biomass preheater 1 to reduce the water content in the biomass raw material, and the dried biomass raw material enters the biomass gasifier 2, which is at the same temperature as 200°C The air and the second preheated steam at 500°C are mixed to undergo a gasification reaction (gasification pressure is 0.1Mpa, gasification temperature is 850°C), and the generated high-temperature syngas enters the first heat exchanger 10 to be heated at 25°C and 0.1Mpa The water is heated to 500°C by the second preheated steam. The second preheated steam is split through the liquid flow divider 11, and is respectively used for preheating air and participating in gasification reaction as a gasification agent. Wherein, the air in the second heat exchanger 12 at 25° C. and 0.1 Mpa is preheated to 200° C. by steam and then passed into the air flow controller 7 to participate in the gasification reaction.

The cooled syngas whose temperature at the outlet of the first heat exchanger 10 has dropped to 25°C passes through the gas-liquid separator 13 to separate condensed water, and the dehydrated syngas is passed into the combustion chamber 14 and mixed with preheated air for combustion, resulting in high temperature The gas is fed into the gas turbine 15 to generate power, and the flue gas generated at about 600-700°C enters the third heat exchanger 16, and exchanges heat with the air compressed to 500°C and 1.7Mpa by the compressor 17, and the air is heated to 700°C After that, it passes into the combustion chamber 14, and the cooled flue gas at the outlet of the third heat exchanger 16 passes into the waste heat boiler 18 to recover the remaining heat to generate steam at about 580°C, and finally the flue gas at about 130°C is discharged to the atmosphere.

The biomass gasification power generation system provided in the embodiments of this specification selects cotton as the research object, and performs simulation calculation with an input of 800 kg/h cotton. The simulation results are shown in Table 1. The output energy of the system is 2348.73Kw, of which the power generation and gas production are 1489.99kW and 868.74kW respectively; the primary energy efficiency is 43.95%. The refrigerant gas efficiency in the biomass gasification process is 66.67%. It can be seen from the design analysis that this system realizes cogeneration of heat and power and cascade utilization of energy; at the same time, biomass and solar energy are used as input energy to realize multi-energy complementarity and deep application of new energy.

Table 1 Simulation results of power generation system

The biomass gasification power generation system provided in the embodiments of this specification is a comprehensive heat supply and power generation system formed by solar-driven biomass gasifiers as the core, supplemented by gas turbine power generation systems, waste heat boilers and other waste heat recovery equipment. The energy system fully combines the energy attributes of solar energy and biomass energy, realizes cogeneration of heat and power and cascade utilization of energy, and improves system performance. In addition, this system uses concentrated solar energy to replace biomass combustion to provide gasification reaction heat, convert solar energy into chemical energy of syngas, enhance solar energy grade and application flexibility, and solve the problems of solar energy discontinuity and instability. Biomass and solar energy are used as input energy to achieve multi-energy complementarity and deep application of new energy, reducing greenhouse gas emissions.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those familiar with this technology to understand the content of the present application and implement it accordingly, and not to limit the protection scope of the present application. All equivalent changes or modifications made according to the spirit of the present application shall fall within the protection scope of the present application.

It should be understood that the foregoing description is for purposes of illustration and not limitation. Many implementations and many applications other than the examples provided will be apparent to those of skill in the art from reading the above description. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for completeness.

Claims (11)

1. A biomass gasification power generation system, the power generation system comprising:

a biomass preheater for preheating biomass;

the biomass gasification furnace is communicated with the biomass preheater and is used for enabling biomass, steam and air to participate in gasification reaction;

the solar focusing mechanism is used for gathering solar radiation and providing heat for biomass gasification reaction so as to generate synthesis gas;

the cyclone dust collector is communicated with the biomass gasification furnace and is used for removing fly ash generated in the gasification reaction process;

the first heat exchanger is communicated with the cyclone dust collector and is used for exchanging heat between the synthesis gas and water to cool the synthesis gas;

the gas-liquid separator is communicated with the first heat exchanger and is used for removing moisture in the cooled synthesis gas;

the combustion chamber is communicated with the gas-liquid separator and is used for mixing and combusting the synthesis gas and air to generate fuel gas;

the gas turbine is used for generating power by utilizing the gas and generating smoke;

a first circulation loop formed between the first heat exchanger and the biomass preheater for providing a first preheating steam to the biomass preheater;

and the branch circuit is arranged on the first circulation loop and used for providing gasifying agent for the biomass gasification furnace.

2. The biomass gasification power generation system according to claim 1, wherein said syngas exchanges heat with water to produce cooled syngas and second pre-heat steam, said first heat exchanger having: the device comprises a water inlet for introducing water, a first water outlet for discharging the second preheated steam and a cooling outlet for cooling the synthesis gas, wherein the cooling outlet is connected with the gas-liquid separator, and the first water outlet is arranged on the first circulation loop.

3. The biomass gasification power generation system according to claim 2, wherein the first circulation loop is provided with, in order from upstream to downstream, between the first water outlet and the biomass preheater: the second heat exchanger is used for exchanging heat between air and the second preheating steam to generate first preheating steam and preheating air, the liquid diverter is provided with a liquid inlet communicated with the first water outlet, a first diversion port and a second diversion port, the first diversion port is used for guiding the second preheating steam into the second heat exchanger, and the second diversion port is used for guiding the second preheating steam into the biomass gasification furnace.

4. The biomass gasification power generation system according to claim 3, wherein said gasifying agent comprises: the second heat exchanger has: the biomass preheater comprises a first air inlet for introducing air, a second water outlet for discharging the first preheated steam and a discharge outlet for discharging the preheated air, wherein the second water outlet is connected with the biomass preheater.

5. The biomass gasification power generation system of claim 4, wherein the power generation system comprises: the flow controller is used for controlling the grouping flow of the gasifying agent and is connected with the bottom of the biomass gasifier; the flow controller includes: the air flow controller is arranged between the exhaust port and the biomass gasification furnace, and the steam flow controller is arranged between the second split port and the biomass gasification furnace.

6. The biomass gasification power generation system according to claim 1, wherein said power generation system further comprises: the third heat exchanger is connected with the gas turbine and is used for exchanging heat between air and the flue gas to generate cooled flue gas and heated air; a second circulation loop formed between the third heat exchanger and the combustion chamber for supplying the heating air to the combustion chamber; and the waste heat boiler is connected with the third heat exchanger and is used for recovering the waste heat of the cooling flue gas.

7. The biomass gasification power generation system according to claim 1, wherein said solar focusing mechanism comprises: the solar energy collecting device comprises a heliostat, a parabolic collecting mirror and a focal plane, wherein the heliostat is used for reflecting solar radiation to the parabolic collecting mirror, and then collecting light rays to the focal plane for heat collection through the parabolic collecting mirror, and the focal plane is arranged on the biomass gasification furnace and used for providing reaction heat for biomass gasification.

8. The biomass gasification power generation system according to claim 4, wherein said biomass preheater employs a divided wall heat exchanger having a heating jacket for preheating biomass, said heating jacket being connected to a second water outlet of said second heat exchanger.

9. The biomass gasification power generation system according to claim 5, wherein said bypass comprises: the steam flow controller comprises a first branch and a second branch, wherein the first branch is formed between the second flow dividing port and the steam flow controller, the second branch is formed between the discharge port and the air flow controller, the first preheating steam has a first preset temperature, the second preheating steam has a second preset temperature, and the first preset temperature is smaller than the second preset temperature.

10. The biomass gasification power generation system according to claim 6, wherein said third heat exchanger has: the second air inlet is used for introducing air, the flue gas inlet is used for introducing flue gas, the cooling flue gas outlet is used for cooling flue gas exhaust and the heating air outlet is used for heating air exhaust, the flue gas inlet is connected with the gas turbine, the cooling flue gas outlet is connected with the waste heat boiler, and the second circulation loop is arranged between the heating air outlet and the combustion chamber.

11. The biomass gasification power generation system according to claim 10, wherein said power generation system comprises: the compressor is connected with the second air inlet and is used for providing compressed air for the third heat exchanger so as to meet the pressure requirement of the combustion chamber; the fly ash bin is communicated with the cyclone dust collector and is used for collecting the separated fly ash particles.

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