WO2013086894A1

WO2013086894A1 - Solar energy and methane energy complementary power generation apparatus

Info

Publication number: WO2013086894A1
Application number: PCT/CN2012/083103
Authority: WO
Inventors: 陈义龙; 杨清萍; 张岩丰
Original assignee: 武汉凯迪工程技术研究总院有限公司
Priority date: 2011-12-12
Filing date: 2012-10-17
Publication date: 2013-06-20

Abstract

A solar energy and methane energy complementary power generation apparatus comprises solar energy heat collection devices (13, 14), a methane storage tank (19), a methane boiler (10), a turboset (2) and a generator (1). A methane combustor (16), a steam superheater (11) and a feed-water preheater (12) are arranged in the methane boiler; the solar energy heat collection devices (13, 14) and the methane combustor (16) can heat steam in the steam superheater (11) simultaneously or separately; an output end of the steam superheater (11) is connected to a high-pressure steam inlet (3) of the turboset (2); a lower-pressure steam outlet (4) of the turboset (2) is connected to the feed-water preheater (12) through a condenser (5), a deaerator (6) and a water feed pump (7) in turn; circulating water output from the feed-water preheater (12) is returned to the steam superheater (11) after being heated by the solar energy heat collection devices (13, 14). This apparatus does not discharge sulfur dioxide or carbon dioxide, can stabilize impact of weather fluctuation on the solar energy and can conveniently change the operating mode of the turboset; therefore, the generator can generate power 24 hours all the day from daytime to nighttime, no matter the weather is sunny or overcast.

Description

Solar energy and biogas complementary power generation equipment

The invention relates to a clean energy power generation device, in particular to a solar energy and biogas energy complementary power generation device. Background technique

At present, with the decreasing of traditional fossil energy reserves such as coal, oil and natural gas, the search for renewable clean energy has become the focus of widespread concern in society. On the other hand, since the environmental pollution caused by the use of fossil energy directly threatens the survival and development of human beings, it has become the consensus of governments to attach importance to and develop renewable clean energy and reduce SO ₂ and CO ₂ emissions. Solar energy is widely distributed, unlimited reserves, collected by the cleaning, so ₂ and C0 ₂ advantages zero emissions, but because it is more energy dispersion, influenced by the weather, energy discontinuity instability problems together, poly solar thermal power generation for a long time The large-scale development and utilization has been greatly limited. The biogas that exists in nature and the biogas produced by fermenting human and animal waste and agricultural and forestry waste biomass are also important renewable energy sources, which are also cleaner than fossil energy. 0 ₂ Zero emission characteristics, but due to the widespread distribution of human and animal waste, agricultural and forestry waste biomass, large dispersion, and difficult collection, not only the utilization rate is low, but also the environmental pollution is extremely high. How to effectively manage human and animal manure and agroforestry waste biomass, and combine it with solar thermal power generation to realize turning waste into treasure has always been a difficult problem for researchers in this field. Summary of the invention

The object of the present invention is to make full use of the energy contained in human and animal waste and abandonment biomass of agricultural and forestry, and overcome the defects that the known solar thermal power station is affected by the weather, unstable energy collection, and discontinuity, and provide a solar energy and biogas energy. Complementary power generation equipment.

In order to achieve the above object, the technical solution of the design of the present invention is as follows:

The invention provides a solar energy and biogas energy complementary power generation device, comprising a solar heat collecting device, a biogas storage tank, a biogas boiler, a steam turbine unit, and a generator coupled with a steam turbine unit, wherein the biogas boiler is provided with a biogas burner, Steam superheater and process water preheater. An output end of the solar heat collecting device is connected to an input end of a steam superheater through a first switching valve, and an output end of the steam superheater is connected to a high pressure steam inlet of a steam turbine through a steam regulating valve, and a low pressure of the steam turbine unit a steam outlet connected to the input of the condenser, the output of the condenser It is connected to the input end of the deaerator to remove oxygen from the circulating water to prevent oxidation corrosion of equipment and pipelines. The output end of the deaerator is connected to the input end of the feed water pump, and the output end of the feed water pump is connected to the input end of the process water preheater through the second on-off valve and the feed water regulating valve, and the preheating of the circulating water is passed. It can save biogas consumption and improve thermal efficiency. The output of the process water preheater is connected to the input of the solar collector, thereby forming a circulation loop for the steam. The outlet of the biogas storage tank is connected to a biogas burner through a biogas compression pump to provide heat to the steam in the steam superheater. The third switching valve and the biogas regulating valve are arranged on the pipeline between the outlet of the biogas storage tank and the biogas burner, the third switching valve is used for controlling the opening and closing of the biogas pipeline, and the biogas regulating valve controls the flow of the biogas. The size of the biogas burner flame is adjusted to control the temperature of the steam in the steam superheater.

The heat conducting medium in the above solar heat collecting device is water. After the water absorbs the solar energy, the steam is directly vaporized into a high temperature and high pressure steam to work on the steam turbine unit, and the structure is simple and the cost is low.

Further, the solar energy and biogas energy complementary power generation device further includes a soft water storage tank, wherein the water outlet of the soft water storage tank is connected to the water supply port of the deaerator through a water pump, and the water outlet of the soft water storage tank and the deaerator A fourth on-off valve is provided on the line between the water supply ports, thereby constituting a circulating water reserve and replenishment system in the steam circulation circuit. The soft water storage tank is used for storing soft water prepared from a chemical water treatment device, and the soft water removes calcium and magnesium ions therein, thereby effectively preventing scaling inside the device; and the fourth switching valve is used for controlling the supply of soft water. And the flow size to supplement the loss of circulating water according to the actual situation.

Further, the solar energy and biogas energy complementary power generating device further includes a biogas generating device, wherein the biogas outlet of the biogas generating device is connected to an input end of the gas water separator through a fifth switching valve, and an output end of the gas water separator Connected to the input end of the desulfurization decarbonization column, the output end of the desulfurization decarbonization column is connected to the inlet of the biogas storage tank. Since the raw materials used in the biogas generating device are mainly human and animal manure and agricultural and forestry waste biomass, the biogas generated during the fermentation process is a mixed gas containing about 60-65% methane and 30-35% carbon dioxide, 1 % hydrogen sulfide, a small amount of water, carbon monoxide, hydrogen and other hydrocarbons, wherein the presence of hydrogen sulfide and water is highly corrosive to equipment, carbon dioxide has no combustion value, and it will consume energy in the system, so gas The water separator and the desulfurization and decarbonization tower are arranged to purify the biogas and remove ineffective components such as water vapor, hydrogen sulfide and carbon dioxide.

Further, a pressure gauge and a thermometer are disposed on the pipeline at the high pressure steam inlet of the steam turbine unit. The purpose of setting the pressure gauge and thermometer is to intuitively control the steam pressure and temperature of the input turbine group to meet the operating requirements of the steam turbine unit.

Further, a sixth on-off valve is passed between the output end of the process water preheater and the input end of the steam superheater Connected. When the sun is sunny during the day, the sixth on-off valve is closed, and the steam and the biogas can simultaneously provide the steam required for the steam turbine to generate electricity. When the night is coming or rainy weather, the sixth on-off valve is opened and the first on-off valve is closed, and the steam line of the steam turbine unit does not have to flow to the solar heat collecting device, and only the biogas can separately supply the steam required for the steam turbine unit to generate electricity.

Another solar energy and biogas energy complementary power generation device provided by the invention comprises a solar heat collecting device, a biogas storage tank, a biogas boiler, a steam turbine unit, and a generator coupled with a steam turbine unit, wherein the biogas boiler is provided with a biogas burner , steam superheater and process water preheater. The output end of the solar heat collecting device is connected to the heat medium inlet of the heat storage heat exchanger through a first switching valve, and the heat medium outlet of the heat storage heat exchanger is connected to the input end of the solar heat collecting device through a hydrothermal pump . The steam output end of the heat storage heat exchanger is connected to the input end of the steam superheater through a seventh switching valve, and the output end of the steam superheater is connected to the high pressure steam inlet of the steam turbine unit through a steam regulating valve, the steam turbine unit The low pressure steam outlet is connected to the input end of the condenser, and the output end of the condenser is connected to the input end of the deaerator to remove oxygen in the circulating water to prevent oxidation corrosion of the equipment and the pipeline. The output end of the deaerator is connected to the input end of the feed water pump, and the output end of the feed water pump is connected to the input end of the process water preheater through the second on-off valve and the feed water regulating valve, and the preheating of the circulating water is passed. It can save biogas consumption and improve thermal efficiency. The output of the process water preheater is connected to the circulating water input of the heat storage heat exchanger, thereby forming a circulation loop for the steam. The outlet of the biogas storage tank is connected to a biogas burner through a biogas compression pump to provide heat to the steam in the steam superheater. The third switching valve and the biogas regulating valve are arranged on the pipeline between the outlet of the biogas storage tank and the biogas burner, the third switching valve is used for controlling the opening and closing of the biogas pipeline, and the biogas regulating valve controls the flow of the biogas. The size of the biogas burner flame is adjusted to control the temperature of the steam in the steam superheater.

The heat conducting medium in the above solar heat collecting device is made of high temperature heat conducting oil, etc., and may be heavy oil, paraffin, molten salt, or other known liquid heat conductive mixture, such as a mixture of biphenyl and diphenyl ether heating temperature up to 400. °C. The high-temperature heat-conducting medium that absorbs solar energy transfers heat to the water through the heat storage heat exchanger, and the water is vaporized into high-temperature and high-pressure steam through the steam superheater to work on the steam turbine unit, and the operation is stable, safe and reliable.

Preferably, it further comprises a soft water storage tank, wherein the water outlet of the soft water storage tank is connected to the water supply port of the deaerator through the water pump, and the pipe between the water outlet of the soft water storage tank and the water supply port of the deaerator A fourth on-off valve is provided on the road. Similarly, the soft water removes calcium and magnesium ions therein, thereby effectively preventing fouling inside the device; and the fourth on-off valve is used to adjust the supply and flow rate of the soft water to supplement the loss of circulating water.

Preferably, it further comprises a biogas generating device, the biogas outlet of the biogas generating device passing through the fifth switching valve Connected to the input end of the gas water separator, the output of the gas water separator is connected to the input end of the desulfurization decarbonization tower, and the output end of the desulfurization decarbonization tower is connected to the inlet of the biogas storage tank. Similarly, the setting of the biogas generating device can ensure the continuity of the operation of the system. The gas water separator and the desulfurization and decarbonization tower can be set to purify the biogas, remove the ineffective components such as water vapor, hydrogen sulfide and carbon dioxide, and prevent corrosion of the equipment. Biogas utilization efficiency.

Preferably, a pressure gauge and a thermometer are disposed on the pipeline at the high pressure steam inlet of the steam turbine unit. Similarly, the settings of the pressure gauge and thermometer can intuitively determine whether the steam pressure and temperature of the input turbine group have reached the rated design parameters, so that they can be adjusted in time to meet the operating requirements of the steam turbine unit.

Preferably, the steam output end of the heat storage heat exchanger is further provided with an emergency switching valve connected to the outside. The purpose of setting the emergency on/off valve is to cooperate with other on-off valves in the event of a sudden failure of the system to protect the system from safe shutdown.

The working principle of the present invention is briefly described as follows: By properly controlling the on-off of the on-off valve of the corresponding pipeline, the following three working modes can be realized: 1. The solar heat collecting device alone in the daytime when the sunshine is sufficient; 2, night or rainy weather The biogas burner alone operates in a mode; 3. The solar collector and the biogas burner operate in a synchronous mode when the daylight is insufficient. Regardless of the mode of the equipment, the steam in the steam superheater can be heated. The high-temperature and high-pressure steam formed is adjusted by the steam regulating valve to reach the rated pressure and temperature of the steam turbine, and then enters the steam turbine to do work and drive the generator. Power generation. The steam that has been completed is cooled by the condenser into normal-pressure low-temperature water, and then the oxygen is removed by the deaerator, and then sent to the process water preheater through the feed water pump and the feed water regulating valve. The circulating water output from the process water preheater can be reheated by the solar collector to return to the steam superheater, or it can be directly returned to the steam superheater to start a new cycle. The biogas burner is further heated for the steam superheater. When it is necessary to replenish the circulating water, the soft water in the soft water storage tank can be sucked into the deaerator by the make-up water pump, and the amount of the water supply is controlled by the corresponding on-off valve.

The invention has the advantages that: the steam thermal power of the designed power generation equipment comes from clean and inexhaustible, inexhaustible solar energy, and biogas energy from fermentation of human and animal waste and waste biomass, two kinds of The synergy of energy complements not only the problems of solar energy dispersion and unstable energy collection, but also the pollution of human and animal waste and waste biomass to the environment, the production of biogas by-product biogas residue, biogas slurry or high-quality crop organic fertilizer. Waste is a treasure, and you can get it in one fell swoop. Compared with the traditional fossil energy power generation, the present invention neither emits SO^CO ₂ and suppresses the influence of weather on the fluctuation of solar energy. Through the regulation of the corresponding on-off valve and regulating valve, the operation mode of the steam turbine is easily changed, so that the generator can be used 24 hours a day, day or night, whether it is sunny or cloudy. Stable power generation. DRAWINGS

1 is a schematic structural view of a solar energy and biogas energy complementary power generation device according to Embodiment 1. Among them: The tower top solar boiler directly transfers heat energy to the steam circulation line of the steam turbine unit.

2 is a schematic structural view of a solar energy and biogas energy complementary power generation device according to Embodiment 2. Among them: Solar solar heat collecting tubes directly transfer heat energy to the steam circulation pipeline of the steam turbine unit.

3 is a schematic structural view of a solar energy and biogas energy complementary power generation device according to Embodiment 3. Among them: The tower top solar energy boiler transfers heat energy indirectly to the steam circulation pipeline of the steam turbine unit.

4 is a schematic structural view of a solar energy and biogas energy complementary power generation device according to Embodiment 4. Among them: Solar solar heat collecting tubes transfer heat energy indirectly to the steam circulation pipeline of the steam turbine unit. detailed description

The invention is further described in detail below with reference to the drawings and specific embodiments.

Example 1:

The solar energy and biogas energy complementary power generation equipment shown in Fig. 1 is mainly composed of a solar heat collecting device, a biogas generating device 20, a gas water separator 31, a desulfurization decarbonization tower 32, a biogas storage tank 19, a biogas boiler 10, and a steam turbine unit 2. The generator 1, the condenser 5, the deaerator 6, the feed water pump 7, the soft water storage tank 9 and the make-up water pump 8 associated with the steam turbine unit 2 are combined by a pipeline and a valve. A biogas burner 16 is installed in the biogas boiler 10, a steam superheater 11 and a process water preheater 12. The valve includes first to sixth on-off valves 22, 24, 28, 26, 21, 33, and an emergency on-off valve 30 for controlling the on and off of the pipeline; the steam regulating valve 23, the feedwater regulating valve 25, and the biogas regulating valve 27 , to regulate the flow of the corresponding fluid.

The solar heat collecting device shown in Fig. 1 comprises a tower top solar boiler 13 and a plurality of matching day mirrors 14 matched thereto, and the sunday mirror 14 can track the sun during the day to concentrate the sunlight to the heat collecting tubes of the solar boiler 13. on. The heat collecting tube output end of the tower top solar boiler 13 is connected to the input end of the steam superheater 11 through the first switching valve 22, and the output end of the steam superheater 11 is connected to the high pressure steam inlet 3 of the steam turbine unit 2 through the steam regulating valve 23, and A pressure gauge P and a thermometer T are installed on the pipeline at the high pressure steam inlet 3 of the steam turbine unit 2 to visually display the pressure and temperature parameters of the steam. The low pressure steam outlet 4 of the steam turbine unit 2 described above is connected to the input end of the condenser 5, and the output end of the condenser 5 is connected to the input end of the deaerator 6. The water outlet of the soft water storage tank 9 is connected to the water supply port of the deaerator 6 through the makeup water pump 8, and the fourth switching valve 26 is disposed on the pipeline between the water outlet of the soft water storage tank 9 and the water supply port of the deaerator 6. To control the opening and closing of the water supply pipe and the amount of water. The output end of the deaerator 6 is connected to the input end of the feed water pump 7, and the output end of the feed water pump 7 is connected to the input end of the process water preheater 12 through the second on-off valve 24 and the feed water regulating valve 25, the process water preheater The output of 12 is connected to the input end of the collecting tube of the overhead solar boiler 13 to form a circulation loop for the steam of the steam turbine unit 2.

The biogas outlet of the biogas generating device 20 is connected to the input end of the gas water separator 31 through the fifth switching valve 21, and the output end of the gas water separator 31 is connected to the input end of the desulfurization decarbonization tower 32, and the desulfurization decarbonization tower 32 is connected. The output is connected to the inlet of the biogas storage tank 19, and the outlet of the biogas storage tank 19 is connected to the biogas burner 16 via a biogas compression pump 18. The third on-off valve 28 and the biogas regulating valve 27 are disposed on the pipeline between the outlet of the biogas storage tank 19 and the biogas burner 16 to regulate the on and off of the biogas, and thereby adjust the size of the flame in the biogas burner 16. Thereby controlling the temperature of the steam in the steam superheater 11.

The sixth on-off valve 33 is disposed on the connecting line between the output end of the process water preheater 12 and the input end of the steam superheater 11. When only biogas is used for power generation, the sixth on-off valve 33 is opened, and the first on-off valve 22 is closed, and the circulating steam of the steam turbine unit 2 can bypass the heat collecting tube of the tower-top solar boiler 13, thereby saving the steam circulation path, thereby reducing the biogas heat energy consumption. . The emergency switch valve 30 connected to the outside is disposed at the output end of the heat collecting pipe of the tower top solar boiler 13 to cooperate with other on-off valves in the event of a sudden failure, and the protection device is safely shut down.

The working process of Embodiment 1 is as follows: When there is sunlight during the day, the sixth on-off valve 33 is closed, the first on-off valve 22 and the second on-off valve 24 are opened, and the system is in a solar-heat collecting operation state. At this time, the day-to-day mirror 14 tracks the sunlight, and collects the sunlight heat energy on the heat collecting pipe of the tower top solar boiler 13, so that the circulating water therein is heated and pressurized, and flows into the steam superheater 11 to form high-temperature high-pressure steam. The high-temperature and high-pressure steam is adjusted to the rated pressure and temperature by the steam regulating valve 23, and then sent to the steam turbine unit 2 for power generation. The steam after the work is cooled by the condenser 5 to a normal-pressure low-temperature water of about 40 ° C, and is sent to the deaerator 6 to remove the dissolved oxygen in the water, and then sent to the process water preheater 12 by the feed water pump 7 to absorb the waste heat. Finally, it is sent back to the heat collecting tube of the tower top solar boiler 13 to start the next cycle. At the same time, the surface water or well water collected separately is initially purified, and then the calcium and magnesium ions are removed from the chemical water treatment workshop and sent to the soft water storage tank 9 for use. When hydration is required, the soft water is sucked by the make-up water pump 8, and the flow rate is controlled by the fourth on-off valve 26, and is supplied to the deaerator 6 to compensate for the amount of water loss. When the sun is insufficient or the amount of power generation needs to be increased, a mode in which solar energy and biogas can co-power can be used. At this time, the third on-off valve 28 is opened, and the biogas in the biogas storage tank 19 is sucked into the biogas burner 16 by the biogas compression pump 18, and the heat energy generated by the biogas combustion is applied to the steam superheater 11, further Heat the steam to compensate for the effects of insufficient solar energy. The biogas regulating valve 27 can be used to control the size of the biogas combustion flame, thereby controlling the temperature and pressure of the steam in the steam superheater to achieve the rated parameters required for the steam turbine unit 2 to generate electricity.

When the amount of biogas is required to be replenished, the fifth on-off valve 21 is opened, and the biogas generated by the biogas generating device 20 is treated by the gas-water separator 31 and the desulfurization and decarbonization tower 32, and then input into the biogas storage tank 19 for use. In general, the pipeline between the biogas generating device 20 and the biogas storage tank 19 can be kept open, so that the biogas can be continuously supplied to the biogas storage tank 19.

In the evening or in the rainy weather, the first on-off valve 22 is closed, the second on-off valve 24, the sixth on-off valve 33 and the third on-off valve 28 are opened, and the system is in a biogas combustion power generation operation state. At this time, the biogas compression pump 18 sucks the biogas in the biogas storage tank 19 into the biogas burner 16 for combustion, and heats the steam superheater 11 to heat up, and the biogas regulating valve 27 can control the size of the biogas combustion flame to form a high temperature and high pressure. After the steam is adjusted to the rated pressure and temperature by the steam regulating valve 23, it is sent to the steam turbine unit 2 for power generation. The steam after the work is cooled by the condenser 5 to a normal-pressure low-temperature water of about 40 ° C, and is sent to the deaerator 6 to remove the dissolved oxygen in the water, and then sent to the process water preheater 12 by the feed water pump 7 to absorb the waste heat. Finally, it is returned to the steam superheater 11 through the sixth switching valve 33 to start the next cycle. When biogas is burned to generate electricity, the biogas and soft water replenishment process is the same as above.

In the first embodiment, the heat conduction medium in the tower top solar boiler is water, and no additional heat exchange equipment is needed, and the water is directly vaporized into high temperature and high pressure steam to work on the steam turbine unit, and the structure is simple and the cost is low.

Example 2:

The solar energy and biogas energy complementary power generation equipment shown in Fig. 2 has the same structure as the solar energy and biogas energy complementary power generation equipment shown in Fig. 1, except that the solar heat collecting device in Fig. 2 is slightly changed, and it is composed of several sets of solar vacuum. The heat collecting tube 13' is composed of a matching grooved parabolic mirror 14', and the output end of the solar vacuum heat collecting tube 13' is connected to the input end of the steam superheater 11 through the first switching valve 22, and the input of the solar vacuum heat collecting tube 13' The end is connected to the output of the process water preheater 12. The working processes of these two types of solar energy and biogas complementary power generation equipment are basically the same, and will not be described here.

Example 3:

The solar energy and biogas energy complementary power generation equipment shown in FIG. 3 is mainly composed of a solar heat collecting device, a biogas generating device 20, a gas water separator 31, a desulfurization decarbonization tower 32, a biogas storage tank 19, a biogas boiler 10, and a steam turbine unit 2. And steam The generator 1, the condenser 5, the deaerator 6, the feed water pump 7, the soft water storage tank 9, and the make-up water pump 8 linked by the turbine unit 2 are combined by a pipeline and a valve. A biogas burner 16, a steam superheater 11 and a process water preheater 12 are installed in the biogas boiler 10. The valve includes first to fifth on-off valves 22, 24, 28, 26, 21, a seventh on-off valve 29, and an emergency on-off valve 30 for controlling the on and off of the pipeline; the steam regulating valve 23, the water supply regulating valve 25, A biogas regulating valve 27 is used to regulate the flow rate of the corresponding fluid.

The solar heat collecting device shown in Fig. 3 comprises a tower top solar boiler 13 and a plurality of matching day-end mirrors 14 which can track the sun during the day to concentrate the sunlight to the heat collecting tubes of the solar boiler 13. on. The heat collecting tube output end of the tower top solar boiler 13 is connected to the heat medium inlet of the heat storage heat exchanger 15 through the first switching valve 22, and the heat medium outlet of the heat storage heat exchanger 15 passes through the hot liquid pump 17 and the tower top solar boiler 13 The heat collecting tube inputs are connected. The heat medium is mixed with biphenyl and diphenyl ether, and is filled in the heat storage heat exchanger 15 provided with the heat insulation layer, and the heat absorption and temperature rise can reach about 40 CTC, which is sufficient for heat exchange to generate high temperature and high pressure steam. The steam output end of the heat storage heat exchanger 15 is connected to the input end of the steam superheater 11 via a seventh switching valve 29, and the output end of the steam superheater 11 is connected to the high pressure steam inlet 3 of the steam turbine unit 2 via a steam regulating valve 23, and A pressure gauge P and a thermometer T are installed on the pipeline at the high pressure steam inlet 3 of the steam turbine unit 2 to visually display the pressure and temperature parameters of the steam.

The low pressure steam outlet 4 of the steam turbine unit 2 described above is connected to the input end of the condenser 5, and the output end of the condenser 5 is connected to the input end of the deaerator 6. The water outlet of the soft water storage tank 9 is connected to the water supply port of the deaerator 6 through the makeup water pump 8, and the fourth switching valve 26 is disposed on the pipeline between the water outlet of the soft water storage tank 9 and the water supply port of the deaerator 6. To control the opening and closing of the water supply pipe and the amount of water. The output end of the deaerator 6 is connected to the input end of the feed water pump 7, and the output end of the feed water pump 7 is connected to the input end of the process water preheater 12 through the second on-off valve 24 and the feed water regulating valve 25, the process water preheater The output of 12 is connected to the circulating water input of the heat storage heat exchanger 15 to form a circulation loop for the steam of the steam turbine unit 2.

The biogas outlet of the biogas generating device 20 is connected to the input end of the gas water separator 31 through the fifth switching valve 21, and the output end of the gas water separator 31 is connected to the input end of the desulfurization decarbonization tower 32, and the desulfurization decarbonization tower 32 is connected. The output is connected to the inlet of the biogas storage tank 19, and the outlet of the biogas storage tank 19 is connected to the biogas burner 16 via a biogas compression pump 18. The third on-off valve 28 and the biogas regulating valve 27 are disposed on the pipeline between the outlet of the biogas storage tank 19 and the biogas burner 16 to regulate the on and off of the biogas, and thereby adjust the size of the flame in the biogas burner 16. Thereby controlling the temperature of the steam in the steam superheater 11. The emergency switch valve 30 connected to the outside is disposed at the steam output end of the heat storage heat exchanger 15 to cooperate with other on-off valves in the event of a sudden failure, and the protection device is safely shut down. The working process of Embodiment 3 is as follows: When there is sunlight during the day, the first on-off valve 22 and the second on-off valve 24 are opened, and the system is in a solar-heat collecting power generation operation state. At this time, the day-to-day mirror 14 tracks the sunlight, and collects the sunlight heat energy on the heat collecting tube of the tower top solar boiler 13, so that the heat medium biphenyl and diphenyl ether mixture absorbs heat and heats up, and the high temperature biphenyl around 40 CTC And the diphenyl ether mixture enters the heat storage heat exchanger 15 through the first switching valve 22, and exchanges heat with the circulating water in the other line in the heat storage heat exchanger 15, the mixed liquid of biphenyl and diphenyl ether The temperature is gradually reduced, and has been reduced to about 245 ° C from the heat storage heat exchanger 15, and then returned to the heat collecting tube of the tower top solar boiler 13 by the hot liquid pump 17, and the next round of absorption of solar energy is started. The loop. The circulating water in the heat storage heat exchanger 15 exchanges heat with the high temperature biphenyl and diphenyl ether mixture, and is heated and pressurized, and flows into the steam superheater 11 through the seventh on-off valve 29 to form high temperature and high pressure steam. The high temperature and high pressure steam is then adjusted to the rated pressure and temperature by the steam regulating valve 23, and then sent to the steam turbine unit 2 for power generation. The steam after the work is cooled by the condenser 5 to a normal-pressure low-temperature water of about 40 ° C, and is sent to the deaerator 6 to remove the dissolved oxygen in the water, and then sent to the process water preheater 12 by the feed water pump 7 to absorb the waste heat. Finally, it is sent back to the heat storage heat exchanger 15 to start the next cycle. At the same time, the surface water or well water collected separately is initially purified, and then the calcium and magnesium ions are removed from the chemical water treatment workshop and sent to the soft water storage tank 9 for use. When hydration is required, the soft water is sucked by the make-up water pump 8, and the flow rate is controlled by the fourth on-off valve 26, and is supplied to the deaerator 6 to compensate for the amount of water loss.

When the sun is insufficient or the amount of power generation needs to be increased, a mode in which solar energy and biogas can co-power can be used. At this time, the third on-off valve 28 is opened, and the biogas in the biogas storage tank 19 is sucked into the biogas burner 16 by the biogas compression pump 18, and the heat energy generated by the biogas combustion is applied to the steam superheater 11, further Heat the steam to compensate for the effects of insufficient solar energy. The biogas control valve 27 can be used to control the size of the biogas combustion flame, thereby controlling the temperature and pressure of the steam in the steam superheater to achieve the rated parameters required for the steam turbine unit 2 to generate electricity.

In the evening or in the rainy weather, the first on-off valve 22 is closed, the second on-off valve 24, the seventh on-off valve 29 and the third on-off valve 28 are opened, and the system is in a biogas combustion power generation operation state. At this time, the biogas compression pump 18 sucks the biogas in the biogas storage tank 19 into the biogas burner 16 for combustion, and heats the steam superheater 11 to heat up, and the biogas regulating valve 27 can control the size of the biogas combustion flame to form a high temperature and high pressure. After the steam is adjusted to the rated pressure and temperature by the steam regulating valve 23, it is sent to the steam turbine unit 2 for power generation. The steam after work is cooled by the condenser 5 to a normal pressure of about 40 ° C The low-temperature water is sent to the deaerator 6 to remove the dissolved oxygen in the water, and then sent to the process water preheater 12 by the feed water pump 7 to absorb the residual heat, and finally passes through the heat storage heat exchanger 15 and the seventh on-off valve 29 in turn. In the steam superheater 11, the next cycle begins. When biogas is burned to generate electricity, the biogas and soft water replenishment process is the same as above.

In the third embodiment, the heat transfer medium in the top solar boiler is a mixed liquid of biphenyl and diphenyl ether, and the heating temperature can reach 40 CTC. The high temperature biphenyl and diphenyl ether mixture which absorbs solar energy transfers heat to the water through the heat storage heat exchanger, and the water is vaporized into high temperature and high pressure steam to work on the steam turbine unit, and the operation is stable, safe and reliable.

Example 4:

The solar energy and biogas energy complementary power generation equipment shown in Fig. 4 has the same structure as the solar energy and biogas energy complementary power generation equipment shown in Fig. 3, except that the solar heat collecting device in Fig. 4 is slightly changed, and it consists of several sets of solar vacuum. The heat collecting tube 13' is composed of a matching grooved parabolic mirror 14', and the output end of the solar vacuum heat collecting tube 13' is connected to the heat medium inlet of the heat storage heat exchanger 15 through the first switching valve 22, and the solar vacuum heat collecting tube 13 The input of ' is connected to the heat medium outlet of the heat storage heat exchanger 15 through the hydrothermal pump 17. The working processes of these two types of solar energy and biogas complementary power generation equipment are also basically the same, and will not be described here.

Claims

Claim

1. A solar energy and biogas complementary power generation equipment, comprising a solar heat collecting device, a biogas storage tank (19), a biogas boiler (10), a steam turbine unit (2), and a generator associated with the steam turbine unit (2) (1) The biogas boiler (10) is provided with a biogas burner (16), a steam superheater (11) and a process water preheater (12), wherein: the output end of the solar heat collecting device passes through An on-off valve (22) is connected to the input of the steam superheater (11), and the output of the steam superheater (11) is connected to the high-pressure steam inlet (3) of the steam turbine (2) via a steam regulating valve (23). The low pressure steam outlet (4) of the steam turbine unit (2) is connected to the input end of the condenser (5), and the output end of the condenser (5) is connected to the input end of the deaerator (6), The output of the deaerator (6) is connected to the input of the feed water pump (7), and the output of the feed water pump (7) is preheated with the process water through the second on-off valve (24) and the feed water regulating valve (25). Connected to the input of the device (12) The output end of the water preheater (12) is connected to the input end of the solar heat collecting device; the outlet of the biogas storage tank (19) is connected to the biogas burner (16) through a biogas compression pump (18), the biogas A third switching valve (28) and a biogas regulating valve (27) are disposed in the line between the outlet of the storage tank (19) and the biogas burner (16).

The solar energy and biogas energy complementary power generating apparatus according to claim 1, characterized in that it further comprises a soft water storage tank (9), and the water outlet of the soft water storage tank (9) is passed through the water pump (8) A water supply port of the oxygen device (6) is connected, and a fourth switching valve (26) is disposed on the line between the water outlet of the soft water storage tank (9) and the water supply port of the deaerator (6).

The solar energy and biogas energy complementary power generation device according to claim 2, further comprising: a biogas generating device (20), wherein the biogas outlet of the biogas generating device (20) passes through the fifth switching valve (21) Connected to the input end of the gas-water separator (31), the output of the gas-water separator (31) is connected to the input end of the desulfurization decarbonization column (32), and the output end of the desulfurization decarbonization column (32) Connected to the inlet of the biogas storage tank (19).

The solar energy and biogas energy complementary power generation device according to claim 1 or 2 or 3, characterized in that: the pressure gauge (P) and the pipeline at the high pressure steam inlet (3) of the steam turbine unit (2) are provided Thermometer (T).

The solar energy and biogas energy complementary power generating apparatus according to claim 1 or 2 or 3, characterized in that: between the output end of the process water preheater (12) and the input end of the steam superheater (11) Connected via the sixth on-off valve (33).

The solar energy and biogas energy complementary power generation device according to claim 1 or 2 or 3, wherein: said solar heat collecting device comprises a tower top solar boiler (13) and a plurality of matching daytime mirrors matched thereto (14), the output end of the collecting heat pipe of the tower top solar boiler (13) is connected to the input end of the steam superheater (11) through the first switching valve (22), and the collecting heat pipe of the tower top solar boiler (13) The input is connected to the output of the process water preheater (12).

The solar energy and biogas energy complementary power generation device according to claim 1 or 2 or 3, wherein: the solar heat collecting device comprises a plurality of sets of solar vacuum heat collecting tubes (13') and matching groove type parabolic reflections thereof a mirror (14'), an output end of the solar vacuum heat collecting tube (13') is connected to an input end of a steam superheater (11) through a first switching valve (22), the solar vacuum heat collecting tube (13') The input is connected to the output of the process water preheater (12).

8. A solar energy and biogas complementary power generation equipment, comprising a solar heat collecting device, a biogas storage tank (19), a biogas boiler (10), a steam turbine unit (2), and a generator associated with the steam turbine unit (2) (1) The biogas boiler (10) is provided with a biogas burner (16), a steam superheater (11) and a process water preheater (12), wherein: the output end of the solar heat collecting device passes through An on-off valve (22) is connected to the heat medium inlet of the heat storage heat exchanger (15), and the heat medium outlet of the heat storage heat exchanger (15) passes through the input end of the hydrothermal pump (17) and the solar heat collecting device Connected; the steam output end of the heat storage heat exchanger (15) is connected to the input end of the steam superheater (11) through a seventh switching valve (29), and the output of the steam superheater (11) is regulated by steam The valve (23) is connected to the high pressure steam inlet (3) of the steam turbine unit (2), and the low pressure steam outlet (4) of the steam turbine unit (2) is connected to the input end of the condenser (5), the condenser (5) The output is connected to the input of the deaerator (6), The output of the oxygen generator (6) is connected to the input end of the feed water pump (7), and the output end of the feed water pump (7) passes through the second on-off valve (24) and the feed water regulating valve (25) and the process water preheater The input end of (12) is connected, the output end of the process water preheater (12) is connected to the circulating water input end of the heat storage heat exchanger (15); the biogas storage tank (19) The outlet is connected to the biogas burner (16) through a biogas compression pump (18), and a third on-off valve (28) is disposed on the line between the outlet of the biogas storage tank (19) and the biogas burner (16) and Biogas regulator valve (27).

The solar energy and biogas energy complementary power generation device according to claim 8, characterized in that it further comprises a soft water storage tank (9), and the water outlet of the soft water storage tank (9) is removed by the water pump (8) A water supply port of the oxygen device (6) is connected, and a fourth switching valve (26) is disposed on the line between the water outlet of the soft water storage tank (9) and the water supply port of the deaerator (6).

10. The solar energy and biogas energy complementary power generating apparatus according to claim 9, further comprising: a biogas generating device (20), wherein the biogas outlet of the biogas generating device (20) passes through the fifth switching valve (21) Connected to the input end of the gas-water separator (31), the output of the gas-water separator (31) is connected to the input end of the desulfurization decarbonization column (32), and the output end of the desulfurization decarbonization column (32) Connected to the inlet of the biogas storage tank (19).

The solar energy and biogas energy complementary power generation device according to claim 8 or 9 or 10, characterized in that: the pressure gauge (P) and the pipeline at the high pressure steam inlet (3) of the steam turbine unit (2) are provided Thermometer (T).

The solar energy and biogas energy complementary power generation device according to claim 8 or 9 or 10, wherein: the steam output end of the heat storage heat exchanger (15) is further provided with an emergency switching valve connected to the outside ( 30).

The solar energy and biogas energy complementary power generation device according to claim 8 or 9 or 10, wherein: said solar heat collecting device comprises a tower top solar boiler (13) and a plurality of fixed day mirrors matched thereto

(14), the output end of the collecting heat pipe of the tower top solar boiler (13) is connected to the heat medium inlet of the heat storage heat exchanger (15) through the first switching valve (22), the tower top solar boiler (13) The heat collecting tube input is connected to the heat medium outlet of the heat storage heat exchanger (15) through a hydrothermal pump (17).

14. The solar energy and biogas energy complementary power generation device according to claim 8 or 9 or 10, wherein: the solar heat collecting device comprises a plurality of sets of solar vacuum heat collecting tubes (13') and matched trough parabolic reflections. a mirror (14'), the output end of the solar vacuum heat collecting tube (13') is passed through the first switching valve (22) and the heat storage The heat medium inlet of the heat exchanger (15) is connected, and the input end of the solar vacuum heat collecting tube (13') is connected to the heat medium outlet of the heat storage heat exchanger (15) through a hydrothermal pump (17).