CN102852741B - System and method for combined heat and power generation of micro biomass and solar energy - Google Patents

Abstract

The invention discloses a micro-biomass and solar heat and power cogeneration system. The system includes a heat transfer fluid circulation loop (I), an organic working fluid circulation loop (II) communicated with the heat transfer fluid circulation loop (I), and a The power generation system and the heat supply system connected by the organic working fluid circulation loop (II); wherein, the thermal fluid circulation loop (I) and the organic working fluid circulation loop (II) share the superheater (4) and the evaporator (5); The thermal system and the organic working medium circulation circuit (II) share the condenser (12). The invention also provides a micro-biomass and solar heat and power cogeneration method, which adopts solar heat and power combined cycle process, biomass heat and power combined cycle process and biomass and solar heat and power combined cycle process. The invention can provide electric energy and thermal energy to users at the same time, has low investment cost, high power generation efficiency and good system stability, and realizes reasonable matching and efficient comprehensive utilization of different renewable energy sources.

Description

A micro-biomass and solar heat and power cogeneration system and method

technical field

The invention relates to a high-efficiency micro-biomass and solar heat and power cogeneration method with an adjustable operation mode, and belongs to the field of renewable energy technology and micro-distributed energy technology.

Background technique

The micro-distributed energy system is an energy supply system arranged at the user end in a small-scale, small-capacity, modularized, and decentralized manner, and the energy supply power is less than 100 kilowatts. The system has the advantages of reducing primary energy consumption, greatly reducing transmission and distribution loss and transmission and distribution costs, and low system cost. It has been valued by countries all over the world, and is especially suitable for remote mountainous areas, farms, forest farms, and single-family buildings with low population density. and other living environments.

At present, distributed energy supply technology and equipment are mainly monopolized by developed countries such as Europe, America and Japan. The United States is one of the first countries to develop distributed energy supply systems. The development level of distributed energy supply in Europe is said to be the world's leading, among which Denmark's distributed energy generation accounts for 52% of the total domestic power generation, which is much higher than the world average. Japan's distributed heat and power (cold) cogeneration system is the third largest energy supply method after gas and electricity.

In my country, the "National Medium and Long-Term Science and Technology Development Plan" regards distributed energy supply technology as four cutting-edge technologies in the energy field alongside hydrogen energy and nuclear energy. Compared with developed countries, my country's distributed energy supply technology is still in its infancy, and there are still many problems that need to be improved, such as poor system adaptability, low cycle efficiency, and imperfect core equipment technology. It is urgent to accelerate the development of related processes and technologies. and equipment development.

Among the many micro-distributed energy supply processes at present, the cogeneration of biomass and solar heat and power has become the focus of the development of countries all over the world because it fully combines the advantages of renewable energy. However, there are still common problems in the existing process systems at present, such as: (1) The environmental adaptability of the equipment is poor. It is difficult to achieve flexible matching of biomass energy and solar energy; (2) The system efficiency is low, and the theoretical power generation efficiency of a well-designed micro-distributed energy system can reach 20%-25%, and the total efficiency of thermoelectricity can reach 70%- At present, my country's current power generation efficiency is only about 10%, and there is still huge room for technological improvement and market development potential.

For this reason, the high-efficiency micro-biomass and solar heat and power cogeneration method proposed in this patent has flexible and adjustable operation modes (solar heat and power combined cycle, biomass combined heat and power cycle, and biomass and solar heat and power combined cycle) to improve renewable energy. The environmental adaptability of the energy system enables it to be applied to a wide range of regions with different climates, and is not restricted by time factors such as seasons and day and night. In addition, this patent uses the organic refrigerant Rankine cycle to replace the conventional steam/refrigerant Rankine cycle, which not only significantly improves the system efficiency, ensures the stability of equipment operation, but also realizes zero damage to the environment by the system.

Contents of the invention

Technical problem: The present invention proposes a micro-biomass and solar heat and power cogeneration system and method to solve the problems of low efficiency and low stability when solar energy and biomass energy are used alone, and at the same time improve the efficiency of renewable energy systems and reduce equipment costs and enable the distribution and miniaturization of renewable energy systems.

Technical solution: In order to solve the above technical problems, the present invention provides a micro-biomass and solar heat and power cogeneration system, the system includes a heat transfer fluid circulation loop, an organic working fluid circulation loop connected to the heat transfer fluid circulation loop, and an organic The power generation system and the heating system connected by the working fluid circulation loop; among them,

The thermal fluid circulation loop and the organic working fluid circulation loop share a superheater and evaporator; the heating system and the organic working fluid circulation loop share a condenser.

Preferably, the heat transfer fluid circulation circuit includes a biomass boiler device, a solar heat absorption conversion device, a heat transfer working medium flow meter, a superheater, an evaporator and a heat transfer working medium circulation pump connected in sequence by a heat transfer fluid pipeline ,in,

The outlet of the biomass boiler device is connected to the inlet of the solar heat absorption conversion device, the outlet of the solar absorption heat conversion device is connected to the inlet of the heat transfer working medium flowmeter, the outlet of the heat transfer working medium flowmeter is connected to the inlet of the superheater, and the superheater The output port of the heat transfer working medium is connected with the heat transfer working medium input port of the evaporator, the outlet of the evaporator is connected with the inlet of the heat transfer working medium circulation pump, and the outlet of the heat transfer working medium circulation pump is connected with the inlet of the biomass boiler device ; A fourth valve and a third valve are respectively provided at the inlet and outlet of the biomass boiler device, and a second valve and a first valve are respectively provided at the inlet and outlet of the solar heat absorption conversion device;

In the cycle of organic working fluid, it includes superheater, monitoring window, micro expander, recuperation heater, condenser, organic working medium liquid storage tank, organic working medium circulation pump, organic working medium flowmeter, organic working medium flowmeter, recuperation heater and evaporator; among them,

The outlet of the superheater is connected to the inlet of the monitoring window, the outlet of the monitoring window is connected to the steam inlet of the micro expander, and the steam outlet of the micro expander is respectively connected to the first inlet of the alternator and the regenerative heater, and the regenerative heater The first outlet of the heater is connected with the first inlet of the evaporator; the second outlet of the regenerative heater is connected with the first inlet of the condenser, and the first outlet of the condenser is connected with the inlet of the organic working fluid storage tank. The outlet of the working fluid storage tank is connected with the inlet of the organic working medium circulation pump, the outlet of the organic working medium circulating pump is connected with the inlet of the organic working medium flowmeter, and the outlet of the organic working medium flowmeter is connected with the second inlet of the regenerative heater connected;

The power generation system includes an alternator, a transformer connected to the alternator;

The heating system includes a condenser, a return water pump and heat users; wherein, the outlet of the return water pump is connected to the second inlet of the condenser, the second outlet of the condenser is connected to the user, and the inlet of the return water pump is connected to the user.

Preferably, the heat transfer fluid circulating in the heat transfer fluid circulation loop is heat transfer oil or water.

Preferably, the circulating working medium used in the organic working medium circulation loop is a non-toxic and non-polluting organic working medium solution.

The present invention also provides a micro-biomass and solar heat and power cogeneration method, the method adopts three cycle modes, namely: solar heat and power combined cycle process, biomass heat and power combined cycle process and biomass and solar heat and power combined cycle process; wherein ,

Solar thermal power combined cycle process: under the condition that the solar energy resources are sufficient to meet the heat energy and electric energy needs of users, the flow directions of the fourth valve, the third valve, the second valve and the first valve are adjusted so that the valves between the fourth valve and the third valve The pipeline between the second valve and the first valve is in a disconnected state, so that the biomass boiler system is not connected to the heat transfer fluid circulation loop, and the heat transfer fluid only passes through the solar heat absorption conversion system , the heat transfer fluid is heated by solar energy alone, and the heat is transferred to the organic working medium circulation loop to realize cogeneration of heat and power;

Biomass heat and power combined cycle process: when there is no solar energy resource or the intensity of solar radiation is less than the operating cost of the combined heat and power system, by adjusting the flow directions of the fourth valve, the third valve, the second valve and the first valve, the fourth The pipelines of the valve and the third valve are disconnected, and the pipeline between the second valve and the first valve is in a straight-through state, so that the heat transfer fluid only passes through the biomass boiler system, and the heat is independently heated by the combustion of biomass Fluid, and transfer heat to the organic working fluid circulation loop to realize cogeneration of heat and power;

Biomass and solar thermal power combined cycle process: In addition to the normal operating conditions of the above two cases, by adjusting the flow direction of the fourth valve, the third valve, the second valve and the first valve, the fourth valve, the third valve The pipeline between them is in a straight-through state, and the pipeline between the second valve and the first valve is in a straight-through state. At this time, the heat transfer fluid is jointly heated by the biomass boiler system and the solar heat absorption conversion system at the same time, and heat transfer Give the organic working medium a circulation loop to realize cogeneration of heat and power.

Beneficial effects: a micro-biomass and solar heat and power cogeneration system with adjustable operation mode proposed by the present invention has the following characteristics and advantages:

1. It can reasonably match the two renewable energy sources of solar energy and biomass energy, that is, make full use of solar energy resources, and overcome the instability of conventional solar power generation systems, making it highly adaptable to the environment, affected by regions and The time limit is small.

2. The present invention only embeds the solar heat absorption and conversion equipment into the system, which saves the necessary heat storage subsystem and afterburning subsystem of the conventional solar thermal power generation system, reduces the complexity of the equipment, and saves investment costs at the same time.

3. The temperature of the heating fluid in the conventional solar heat collection system is generally low. By integrating it into the biomass power generation system, the temperature of the heat transfer fluid can be further increased and the power generation efficiency of the system can be improved.

4. The Rankine cycle of organic working medium is used to replace the conventional steam Rankine cycle to improve the power generation efficiency of the system, and at the same time, it can ensure the dryness of the expander outlet, protect the equipment and improve the stability of the system operation.

The solar heat absorption conversion equipment can be distributed on the top floor of the building, and the biomass boiler system can directly replace the domestic heating boiler. The main equipment does not occupy additional building space, does not affect the architectural design and appearance, and at the same time realizes the maximum utilization of resources.

Description of drawings

Fig. 1 is the schematic diagram of the micro solar energy and biomass combined heat and power system of the present invention.

The system consists of two loops of heat transfer fluid circulation I and organic working medium circulation II. The figure includes: biomass boiler system 1, solar heat absorption conversion system 2, heat transfer working medium flow meter 3, superheater 4, evaporator 5, heat transfer working medium circulation pump 6, monitoring window 7, micro expander 8, Alternator 9, Transformer 10, Regeneration Heater 11, Condenser 12, Organic Working Fluid Storage Tank 13, Organic Working Fluid Circulation Pump 14, Organic Working Fluid Flowmeter 15, Return Water Pump 16, Heat User 17, the first Three-phase valve V1, second three-phase valve V2, third three-phase valve V3, and fourth three-phase valve V4.

Biomass particle inlet A, boiler flue gas outlet B, cooling water inlet C, hot water output D, and electric energy output E.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

The present invention combines solar heat collection technology with biomass combustion technology to provide the system with a stable heat source that is not affected by external environmental factors such as region and time. Boiling point organic working fluid to replace the conventional water vapor Rankine cycle. The basic idea is as follows: use concentrating devices and heat collecting devices to convert solar radiation heat into heat energy, and heat the heat transfer fluid with the heat generated by the combustion of biomass particles in the micro-biomass boiler. The heat transfer fluid passes through the superheater and evaporator in turn to exchange heat with the organic working medium solution, turning it into superheated dry steam, driving the micro turbine unit to generate electricity, and exchanging heat in the condenser to the cooling water to realize the output of electric energy and heat energy.

Referring to Fig. 1, the micro-biomass and solar heat and power cogeneration system provided by the present invention includes a heat transfer fluid circulation loop I, an organic working fluid circulation loop II communicated with the heat transfer fluid circulation loop I, and an organic working fluid circulation loop respectively The power generation system and the heating system connected by loop II; wherein,

The thermal fluid circulation loop I and the organic working medium circulation loop II share the superheater 4 and the evaporator 5; the heat supply system and the organic working medium circulation loop II share the condenser 12 .

In the heat transfer fluid circulation loop I, it includes a biomass boiler device 1, a solar heat absorption conversion device 2, a heat transfer working fluid flowmeter 3, a superheater 4, an evaporator 5 and a heat transfer device connected in sequence by a heat transfer fluid pipeline. Mass circulation pump 6, wherein, the outlet of biomass boiler device 1 is connected with the inlet of solar heat absorption conversion device 2, the outlet of solar energy absorption heat conversion device 2 is connected with the inlet of heat transfer working medium flowmeter 3, and the flow rate of heat transfer working medium The outlet of gauge 3 is connected to the inlet of superheater 4, the heat transfer working medium output port of superheater 4 is connected to the heat transfer working medium input port of evaporator 5, and the outlet of evaporator 5 is connected to the inlet of heat transfer working medium circulation pump 6 , the outlet of the heat transfer working fluid circulation pump 6 is connected with the inlet of the biomass boiler device 1; the inlet and outlet of the biomass boiler device 1 are respectively provided with a fourth valve V4 and a third valve V3, and the solar heat absorption conversion device 2 The inlet and outlet of the valve are respectively provided with a second valve V2 and a first valve V1.

In the organic working medium cycle II, it includes a superheater 4, a monitoring window 7, a micro expander 8, a recuperation heater 11, a condenser 12, an organic working medium liquid storage tank 13, and an organic working medium connected sequentially by the organic working medium pipeline. Mass circulation pump 14, organic working medium flowmeter 14, organic working medium flowmeter 15, recuperation heater 11 and evaporator 5; wherein, the outlet of superheater 4 is connected with the inlet of monitoring window 7, and the outlet of monitoring window 7 is connected with The steam inlet of the micro expander 8 is connected, the steam outlet of the micro expander 8 is connected with the alternator 9 and the first inlet of the regenerative heater 11 respectively, and the first outlet of the regenerative heater 11 is connected with the first outlet of the evaporator 5 The first inlet is connected; the second outlet of the recuperation heater 11 is connected with the first inlet of the condenser 12, and the first outlet of the condenser 12 is connected with the inlet of the organic working fluid storage tank 13, and the organic working fluid storage tank 13 The outlet of the organic working fluid circulation pump 14 is connected to the outlet, the outlet of the organic working fluid circulation pump 14 is connected to the inlet of the organic working fluid flowmeter 15, and the outlet of the organic working fluid flowmeter 15 is connected to the second inlet of the regenerative heater 11 connected.

The power generation system includes an alternator 9, a transformer 10 connected to the alternator 9; the heating system includes a condenser 12, a return water pump 16 and a heat user 17; wherein, the outlet of the return water pump 16 is connected to the second inlet of the condenser 12, The second outlet of the condenser is connected with the user, and the inlet of the return water pump 16 is connected with the user.

The heat transfer fluid circulating in the heat transfer fluid circulation loop I is heat transfer oil or water.

The circulating working medium used in the organic working medium circulation loop II is a non-toxic and non-polluting organic working medium solution.

The present invention also provides a micro-biomass and solar heat and power cogeneration method, the method adopts three cycle modes, namely: solar heat and power combined cycle process, biomass heat and power combined cycle process and biomass and solar heat and power combined cycle process; wherein ,

Solar thermal power combined cycle process: under the condition that the solar energy resources are sufficient to meet the heat energy and electric energy needs of users, the flow directions of the fourth valve V4, the third valve V3, the second valve V2 and the first valve V1 are adjusted so that the fourth valve V4 , The pipeline between the third valve V3 is in a straight-through state, and the pipeline between the second valve V2 and the first valve V1 is in a disconnected state, so that the biomass boiler system 1 is not connected to the heat transfer fluid circulation loop I, The heat transfer fluid only passes through the solar heat absorption conversion system 2, the heat transfer fluid is heated by solar energy alone, and the heat is transferred to the organic working fluid circulation loop II to realize cogeneration of heat and power;

Biomass heat and power combined cycle process: when there is no solar resource or the intensity of solar radiation is less than the operating cost of the combined heat and power system, by adjusting the flow direction of the fourth valve V4, the third valve V3, the second valve V2 and the first valve V1 , so that the pipelines of the fourth valve V4 and the third valve V3 are disconnected, and the pipelines between the second valve V2 and the first valve V1 are in a straight-through state, so that the heat transfer fluid only passes through the biomass boiler system 1, by The heat released by burning biomass heats the heat transfer fluid separately, and transfers the heat to the organic working fluid circulation loop II to realize cogeneration of heat and power.

Biomass and solar thermal power combined cycle process: In addition to the normal operating conditions of the above two cases, by adjusting the flow direction of the fourth valve V4, the third valve V3, the second valve V2 and the first valve V1, the fourth valve of the valve The pipeline between V4 and the third valve V3 is in a straight-through state, and the pipeline between the second valve V2) and the first valve V1 is in a straight-through state. At this time, the heat transfer fluid receives the biomass boiler system 1 and solar heat at the same time. The common heating of the absorption conversion system 2, and heat transfer to the organic working medium circulation loop II, realizes cogeneration of heat and power.

The heat transfer fluid circulating in the heat transfer fluid circulation loop I is heat transfer oil or water.

What circulates in the organic working medium loop II is the Rankine cycle working medium, which is a non-toxic and pollution-free organic working medium solution. For example, the cycle power generation efficiency can reach 20%~25%.

The organic working medium solution is a series of solutions of hydrofluoroether (Hydrofluo-roether).

Details are as follows.

The construction method and realization method of the system of the present invention are shown in Fig. 1 , the heat and power cogeneration system is composed of two loops of a heat transfer fluid cycle I and an organic working medium cycle II. In the dotted line box on the left side of Figure 1 is the heat transfer fluid circulation I. In the case of solar radiation, the solar heat absorption conversion system 2 uses solar radiation heat absorption to heat the heat transfer fluid (such as heat transfer oil, water, etc.) to the set value When the solar radiation is weak or there is no solar radiation, the biomass boiler system 1 burns biomass particles to supplement the heat required for heating to the set temperature. The heat transfer fluid heated to the set temperature passes through the superheater 4 and the evaporator 5 to transfer heat to the organic working medium solution, the temperature of the heat transfer fluid after heat transfer drops, and then pressurized by the heat transfer working medium circulation pump 6 Then re-enter the solar heat absorption conversion system 2 and the biomass boiler system 1 for heating to complete a cycle. The dotted line box on the right side of Figure 1 is the organic working medium cycle II. The organic working medium solution is first preheated by the regenerative heater 10, and then enters the evaporator 5 to be heated to become saturated steam, and is further heated to high pressure in the superheater 4 The superheated dry steam, the superheated dry steam passes through the monitoring window 7, enters the micro expander 8, and drives the alternator 9 to generate electric energy. After doing work, the superheated dry steam turns into wet steam, which is partially released by the heat recovery heater 11, and then enters the condenser 12 to be cooled by the cooling water, and the wet steam recondenses into a liquid organic working medium solution, which flows into the organic working medium storage solution Tank 13, completed one cycle.

Among them, the biomass boiler system 1 is connected to the heat transfer fluid cycle I through the three-way valves V3 and V4, while the solar heat absorption conversion system 2 is connected to the heat transfer fluid cycle I through the three-way valves V1 and V2. Therefore, by operating the different settings of the four three-phase valves, the system can change the operating conditions according to the influence of factors such as the user's local time and seasons, and realize the following three operations:

1. Solar heat and power combined cycle: under the condition that the solar energy resources are sufficient to meet the needs of users for heat and electricity, adjust the flow direction of the four three-way valves so that the pipeline between the valves V3 and V4 is in a straight-through state, and the valves V1 and V2 The pipeline between them is disconnected, so that the biomass boiler system 1 is not connected to the heat transfer fluid circulation I, and the heat transfer fluid only passes through the solar heat absorption conversion system 2, and the heat transfer fluid is heated by the solar energy alone to realize the thermoelectricity of the system. joint production.

2. Biomass heat and power combined cycle: When there is no solar energy resource (such as at night) or the solar radiation intensity is less than the operating cost of the combined heat and power system, by adjusting the flow direction of the four three-way valves, the flow between valves V3 and V4 The pipeline is disconnected, and the pipeline between valves V1 and V2 is in a straight-through state, so that the heat transfer fluid only passes through the biomass boiler system 1, and the heat transfer fluid is heated independently by the heat released by burning biomass to realize the combined heat and power generation of the system .

Biomass and solar thermal power combined cycle: In addition to the normal operating conditions of the above two cases, by adjusting the flow direction of the four three-way valves, the pipeline between the valves V3 and V4 is in a straight-through state, and the pipeline between the valves V1 and V2 The pipeline is in a straight-through state. At this time, the heat transfer fluid is simultaneously heated by the biomass boiler system 1 and the solar heat absorption conversion system 2 to realize cogeneration of heat and power in the system.

According to the solar radiation situation and the user's demand situation, the system has three main operation modes. The following will be described with reference to Figure 1. The operation mode adopts the combined cycle operation of biomass and solar thermal power, the heat transfer medium is water, and the organic working medium is hydrofluoroether (Hydrofluo-roether) solution HFE7000 as an example. Practical operation method of organic Rankine cycle micro-biomass and solar cogeneration system.

After adding fuel particles into the biomass boiler system 1, start the boiler, set the temperature of the heat transfer fluid at the inlet of the superheater 4 to 140°C, and the pressure to 400-500kPa, and at the same time turn on the solar heat absorption and conversion system 2 to absorb solar heat radiation, adjust the three According to the flow direction of the valve, the pipeline between V1 and V2 is disconnected, and the pipeline between V3 and V4 is disconnected. Turn on the heat transfer working fluid circulation pump 6, the heat transfer fluid circulation I starts, the water is heated together by the biomass boiler system 1 and the solar heat absorption conversion system 2, and the temperature rises to the set temperature and pressure, and then passes through the superheater 4 and the evaporator in turn 5 Transfer heat to the organic working medium solution. The heat transfer working medium after heat release is pressurized by the heat transfer working medium circulation pump 6 and then returns to the biomass boiler system 1 and the solar heat absorption conversion system (2) for reheating, thereby continuously circulating.

Turn on the organic working medium circulation pump 13, the organic working medium cycle II starts, and the organic working medium HFE7000 is heated and vaporized in the evaporator 5, heated to 90-100°C, saturated steam of 400-500kPa, and further heated by the heater 4. After superheated dry steam at 110-120°C and 500-600kPa passes through the monitoring window 7, it enters the micro-expander 8 to expand and perform work. The micro-expander 8 drives the alternator 9 to generate electricity, and the low-voltage electricity generated is boosted by the transformer 10 and then supplied. user use. After doing work, the superheated dry steam turns into wet steam with a temperature of 80-100°C and 150-200kPa. After passing through the heat recovery heater 11, the temperature drops to 70-80°C, and then enters the condenser 12 to be further cooled. The liquid organic working fluid condensed from the steam flows into the organic working medium liquid storage tank 13, and after being pressurized by the organic working medium circulation pump 14, it enters the evaporator 5 and the superheater 4 again to be heated, thereby continuously circulating.

The cooling water from the heat user 17 is sent to the condenser 12 to be heated to 50-60°C through the return pump 16, and the hot water after the heating process is completed is sent back to the heat user 17 for building heating and domestic hot water.

The difference between the other two modes of operation and the operation of biomass and solar thermal power combined cycle is only that in the solar thermal power combined cycle, the heat transfer fluid only passes through the solar heat absorption conversion system2; in the biomass combined heat and power cycle, the heat transfer fluid only passes Through the biomass boiler system 1.

The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.

Claims (2)

1. A micro biomass and solar cogeneration system, is characterized in that the system comprises a heat transfer fluid circulation loop (I), an organic working fluid circulation loop (II) communicated with the heat transfer fluid circulation loop (I), A power generation system and a heat supply system respectively connected with the organic working fluid circulation loop (II); wherein, The thermal fluid circulation loop (I) and the organic working medium circulation loop (II) share a superheater (4) and an evaporator (5); the heating system and the organic working medium circulation loop (II) share a condenser (12); The heat transfer fluid circulation loop (I) includes a biomass boiler device (1), a solar heat absorption conversion device (2), a heat transfer working medium flowmeter (3), and a superheater ( 4), evaporator (5) and heat transfer working fluid circulation pump (6), wherein, The outlet of the biomass boiler device (1) is connected to the inlet of the solar heat absorption conversion device (2), the outlet of the solar energy absorption heat conversion device (2) is connected to the inlet of the heat transfer working fluid flow meter (3), and the heat transfer working fluid The outlet of the flowmeter (3) is connected to the inlet of the superheater (4), the heat transfer working medium output port of the superheater (4) is connected to the heat transfer working medium input port of the evaporator (5), and the outlet of the evaporator (5) It is connected with the inlet of the heat transfer working medium circulation pump (6), and the outlet of the heat transfer working medium circulation pump (6) is connected with the inlet of the biomass boiler device (1); at the inlet and outlet of the biomass boiler device (1) respectively A fourth valve (V4) and a third valve (V3) are provided, and a second valve (V2) and a first valve (V1) are respectively provided at the inlet and outlet of the solar heat absorption conversion device (2); In the organic working medium cycle (II), it includes a superheater (4), a monitoring window (7), a micro expander (8), a recuperation heater (11), a condenser (12) connected in sequence by an organic working medium pipeline ), organic working medium liquid storage tank (13), organic working medium circulation pump (14), organic working medium flowmeter (14), organic working medium flowmeter (15), reheating heater (11) and evaporator ( 5); where, The outlet of the superheater (4) is connected to the inlet of the monitoring window (7), the outlet of the monitoring window (7) is connected to the steam inlet of the micro expander (8), and the steam outlet of the micro expander (8) is respectively connected to the AC The generator (9) is connected to the first inlet of the regenerative heater (11), and the first outlet of the regenerative heater (11) is connected to the first inlet of the evaporator (5); the regenerative heater (11) The second outlet links to each other with the first inlet of condenser (12), and the first outlet of condenser (12) links to each other with the inlet of organic working medium liquid storage tank (13), and the outlet of organic working medium liquid storage tank (13) is connected with The inlet of the organic working medium circulation pump (14) is connected, the outlet of the organic working medium circulation pump (14) is connected with the inlet of the organic working medium flowmeter (15), and the outlet of the organic working medium flowmeter (15) is connected with the regenerative heater (11) connected to the second entrance; The power generation system includes an alternator (9), a transformer (10) connected to the alternator (9); The heat supply system includes a condenser (12), a return water pump (16) and a heat user (17); wherein, the outlet of the return water pump (16) is connected to the second inlet of the condenser (12), and the second outlet of the condenser is connected to the user Link to each other, and the inlet of the water return pump (16) links to each other with the user. 2. a kind of micro-biomass and solar energy cogeneration method as claimed in claim 1 micro-biomass and solar energy cogeneration system, it is characterized in that, the method adopts three kinds of cycle patterns, that is: solar energy heat and electricity combined cycle process, Biomass heat and power combined cycle process and biomass and solar heat and power combined cycle process; where, Combined cycle process of solar heat and electricity: under the condition that the solar energy resources are sufficient to meet the heat energy and electric energy needs of users, the fourth valve (V4), the third valve (V3), the second valve (V2) and the first valve (V1) are adjusted. flow direction, so that the pipeline between the fourth valve (V4) and the third valve (V3) is in a straight-through state, and the pipeline between the second valve (V2) and the first valve (V1) is in a disconnected state, so that The biomass boiler system (1) is not connected to the heat transfer fluid circulation loop (I), the heat transfer fluid only passes through the solar heat absorption conversion system (2), the heat transfer fluid is heated by solar energy alone, and the heat is transferred to the organic working medium for circulation Loop (II) realizes cogeneration of heat and power; Biomass heat and power combined cycle process: when there is no solar resource or the intensity of solar radiation is less than the operating cost of the combined heat and power system, by adjusting the fourth valve (V4), the third valve (V3), the second valve (V2) and The flow direction of the first valve (V1) makes the pipelines of the fourth valve (V4) and the third valve (V3) disconnected, and the pipeline between the second valve (V2) and the first valve (V1) is Straight-through state, so that the heat transfer fluid only passes through the biomass boiler system (1), and the heat transfer fluid is heated independently by the heat released by the burning biomass, and the heat is transferred to the organic working medium circulation loop (II), realizing cogeneration of heat and power; Biomass and solar thermal power combined cycle process: In addition to the normal operating conditions of the above two cases, by adjusting the fourth valve (V4), the third valve (V3), the second valve (V2) and the first valve (V1) The flow direction of the valve makes the pipeline between the fourth valve (V4) and the third valve (V3) in a straight-through state, and the pipeline between the second valve (V2) and the first valve (V1) is in a straight-through state. At this time, the heat transfer fluid is heated by the biomass boiler system (1) and the solar heat absorption conversion system (2) at the same time, and transfers heat to the organic working medium circulation loop (II), realizing cogeneration of heat and power.