CN116267329A - Comprehensive utilization method of thermoelectricity of anaerobic fermentation biogas - Google Patents
Comprehensive utilization method of thermoelectricity of anaerobic fermentation biogas Download PDFInfo
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Abstract
The invention discloses a method for comprehensively utilizing thermoelectric energy of anaerobic fermentation biogas, which relates to the technical field of energy comprehensive utilization of anaerobic fermentation technology, and comprises the following steps: firstly, electric energy generated by anaerobic fermentation biogas power station is utilized to maintain anaerobic fermentation unitAnd the normal operation of the production living area, and then the residual electric energy and waste heat of the anaerobic fermentation biogas power station and the tail gas of anaerobic fermentation biogas power generation are used for planting greenhouse vegetables in winter; the plant growth light supplementing lamp is utilized to supplement light for greenhouse vegetables, the electric heating fan is utilized to provide electricity for the vegetable planting greenhouse for auxiliary heating, the biogas power generation waste heat is utilized to raise and maintain the temperature in the vegetable greenhouse, and the biogas power generation tail gas is utilized to provide CO for greenhouse vegetable growth 2 . The invention provides an on-site or near-site utilization way for methane 'thermoelectric', and has the advantages of small construction investment and high energy utilization rate. In addition, the greenhouse utilization of the tail gas generated by marsh gas power generation can also realize CO 2 The source of emissions is curtailed.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of energy sources of anaerobic fermentation technology, and particularly relates to a comprehensive utilization method of thermoelectricity of anaerobic fermentation biogas.
Background
The high-concentration organic wastewater such as food processing wastewater, livestock and poultry breeding wastewater, brewing wastewater and the like has the characteristics of high concentration of organic matters and good biodegradability, and has huge recycling potential. The biogas production by anaerobic fermentation is one of important ways for recycling high-concentration organic wastewater, not only can recover organic matters in the high-concentration organic wastewater in a renewable energy form, but also can effectively reduce the concentration of organic pollutants in the wastewater, thereby achieving the purposes of energy conservation and emission reduction. Biogas has many utilization ways, wherein the power generation by using biogas is widely popularized and applied worldwide. The biogas power generation can replace the traditional coal power generation to a certain extent, and the emission of greenhouse gases can be reduced.
The technology of methane heat and power cogeneration refers to not only utilizing the electricity generated by methane power generation, but also using the waste heat generated in the methane power generation process for maintaining the temperature of an anaerobic fermentation tank, heating residents or other production and living purposes. The related literature shows that only about 1/3 of energy is converted into electric power when methane is combusted for power generation, and the rest of the energy is dissipated in the form of heat energy, wherein the dissipation proportion of the generator cooling medium is 15-25%, and the dissipation proportion of the tail gas is 35-45%. Therefore, the reasonable mode is adopted to recycle the waste heat generated by the biogas power generation, and the energy utilization rate of the biogas power station can be greatly improved
The main component of the biogas is CH 4 (55% -70%) and CO 2 (30% -45%) and also contains a small amount of H 2 S、N 2 、H 2 Isogas (<)5％)。CH 4 The biogas with the content of more than 50 percent can be directly used for biogas power generation. By CH 4 For example, the biogas with 60% content is used for driving a generator to generate electricity by using a biogas internal combustion engine, and CO in tail gas of the biogas internal combustion engine 2 The content is up to 15% -17%, and the tail gas also contains a small amount of CO (less than 1%) and NO x (＜0.5％)。CO 2 Is one of the major greenhouse gases, and its excessive emissions create global climate warming and a series of social and ecological problems associated therewith.
Disclosure of Invention
The invention aims to solve the problems that the existing technology of 'cogeneration' of anaerobic fermentation biogas is used as one of the high-concentration organic wastewater recycling utilization ways, the existing implementation method is still relatively single, and 'thermoelectric' long-distance transportation has the defects of high construction investment, large heat energy loss and low energy utilization rate, and provides a comprehensive utilization method of the thermoelectricity of anaerobic fermentation biogas. The comprehensive utilization method of the thermoelectricity of the anaerobic fermentation biogas provides an on-site or near-site utilization way for the biogas, and has the advantages of low construction investment and high energy utilization rate. And the greenhouse utilization of the biogas power generation tail gas can also realize CO 2 The source of emissions is curtailed.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method is suitable for high latitude in the north of China, the technology of methane heat and power cogeneration is applied to winter greenhouse vegetable planting in winter climate and cold areas, and meanwhile, the greenhouse utilization way of methane power generation tail gas is increased on the basis. The method specifically comprises the following 3 aspects: 1) Greenhouse utilization of biogas power generation; 2) Greenhouse utilization of waste heat generated by biogas generation; 3) The greenhouse utilization of the biogas power generation tail gas specifically comprises the following steps: firstly, the electric energy generated by the anaerobic fermentation biogas power station is utilized to maintain the normal operation of the anaerobic fermentation unit and the production living area, and the self-utilization rate of biogas power generation can reduce the requirements of the anaerobic fermentation and the production living area (internal system) on external energy supply and the corresponding operation cost. And then the residual electric energy and waste heat of the anaerobic fermentation biogas power station and the tail gas of anaerobic fermentation biogas power generation are used for planting greenhouse vegetables in winter.
The waste heat of the anaerobic fermentation biogas power station is connected to a heat exchange system of the vegetable greenhouse through a heating pipeline in a heat medium mode, heat exchange is carried out to raise the temperature of the vegetable greenhouse, the residual electric energy of the anaerobic fermentation biogas power station is connected with a plant growth light supplementing lamp and an electric heating fan in the vegetable greenhouse, the electric heating fan is used for providing electricity and auxiliary heat for the greenhouse, a tail gas pipe of the anaerobic fermentation biogas power station is connected to the vegetable greenhouse, and CO in tail gas is used 2 Lifting and maintaining CO in greenhouse 2 Concentration.
Further, the distance between the closest point of the anaerobic fermentation biogas power station and the vegetable planting greenhouse is not more than 2km. Because of the high latitude in north of China and the low temperature, low illumination intensity and short illumination time in winter in cold climate areas, the requirements of winter greenhouse vegetable planting on illumination and heat energy supply are larger. The shorter distance between the biogas power station and the vegetable planting greenhouse can reduce the construction cost of a power transmission line and a heating power pipeline and the energy loss of electric energy and heat energy in the conveying process. The heat medium is transported in the heating power pipeline to supply power, and the shorter heating power pipeline can reduce the power requirement of heat medium transportation. The short-distance power transmission can adopt a safe low-voltage line, while the long-distance power transmission needs high-voltage transmission equipment (transformers and the like) and high-voltage transmission lines, so that the construction cost is greatly increased, and the implementation feasibility is reduced.
Furthermore, the anaerobic fermentation biogas power station consists of a biogas generator set and a battery pack energy storage system, wherein the anaerobic fermentation biogas yield is greater than the air inflow of the biogas generator set which keeps 80% of load operation for 24h and is smaller than the air inflow of the biogas generator set which runs for 24h under full load, and the storage of the battery pack energy storage system is not less than the requirement of the biogas generator set on 2h under full load operation. The biogas generator set can provide continuous and stable power supply for the anaerobic fermentation unit and the production living area by adopting 24h continuous operation. If the biogas generator set is operated intermittently, the power required to be supplied by the power utilization facility is required to be supplied by the battery pack energy storage system, which greatly increases the arrangement of the battery pack Metering and consequent cost of the battery. The installed power of the biogas generator set should be selected to fully consume the biogas output under the 24h full power operation condition, and in order to ensure that the biogas generator set is operated at 80% and above of the load as much as possible in the 24h operation period (namely, the high-efficiency section of the biogas generator set), the average biogas output in one day should exceed the biogas generator set 24h to keep 80% of the load operation air input. The battery pack energy storage system is only used as buffer equipment of power consumption load and is used for releasing power during peak power consumption, compensating for output voltage reduction caused by insufficient power generation capacity of the biogas power station, storing power during low power consumption, avoiding output voltage increase caused by excessive power generation capacity of the biogas power station, and ensuring normal operation of power generation equipment and normal use and safety of electric equipment. The biogas for generating power of the biogas power station needs to be subjected to desulfurization pretreatment to ensure that the biogas is H 2 S content is less than 20mg/m 3 The tail gas of methane power generation should be subjected to dust removal and denitration treatment, and the smoke concentration in the tail gas is lower than 5mg/m 3 Nitrogen oxide concentration lower than 100mg/m 3 . On one hand, the concentration of smoke dust and nitrogen oxides in H2S in methane and tail gas generated by methane power generation is limited, and on the one hand, the pollution of the tail gas which does not meet the emission requirement to the atmosphere is avoided based on the environmental protection requirement. On the other hand, the greenhouse utilization way of the biogas power generation tail gas can directly discharge the power generation tail gas into the greenhouse, SO that the pollutant concentration of the biogas power generation tail gas is limited, and the condition that the concentration of SO2, smoke dust and nitrogen oxides in the vegetable greenhouse exceeds the standard can be avoided, and the physical health of workers working in the greenhouse is endangered.
Further, when the plant growth light supplementing lamp (2) is used for supplementing light to greenhouse vegetables, the light supplementing allowed time period is 8 in one day: 00 to 17:00, when in light supplementing, the light intensity of the light supplementing lamp is adjusted according to the sunlight light intensity in the greenhouse, so that the light intensity in the greenhouse is maintained within the light intensity range required by photosynthesis of vegetables planted in the greenhouse. Because the sunlight intensity in winter in the northern high-latitude areas of China is weak, the sunlight reflection of the greenhouse, the material of the greenhouse, dew and dust attached to the greenhouse and the weakening of transmitted sunlight further reduce the illumination intensity in the greenhouse, and the sunlight irradiation time in winter is shortened, so that the growth of greenhouse vegetables is slow, the growth period is prolonged, the yield is reduced (melons and fruits vegetables are particularly obvious), and diseases and insect pests are more likely to occur. The plant growth light supplementing lamp is used for supplementing light for greenhouse vegetables, so that the growth speed and yield of the vegetables can be improved, and the occurrence of plant diseases and insect pests is reduced. And the illumination intensity and illumination time can be actively controlled through the plant lamp light supplementing, and the sunlight illumination condition can be actively regulated according to implementation, so that the vegetables can be favorably kept in a good and stable growth state. On the other hand, in the northern high-latitude areas of China, the winter illumination intensity is low, the illumination time is short, so that the winter greenhouse can only be used for planting leaf vegetables (such as lettuce, water spinach, chinese chives and the like) with lower illumination requirements, and after the plant light supplementing lamp is added, the winter greenhouse can be used for planting rootstocks, melons and fruits vegetables (such as radishes, tomatoes, peas and the like) with higher illumination requirements. In addition, due to the scarcity of the melon and fruit vegetables in the north in winter, higher prices can be sold. In general, the plant growth light supplementing lamp can increase the yield of winter greenhouse vegetables and widen the varieties of winter greenhouse vegetables, and brings remarkable economic benefits. The timing of utilizing the plant growth light filling lamp to fill in the light for greenhouse vegetables is selected in the daytime, so that the interference to the night sleep of the vegetables is avoided. The light intensity required for plant growth has a light compensation point and a light saturation point, and when the light intensity is larger than the light compensation point but smaller than the light saturation point, the photosynthesis intensity is increased along with the increase of the light intensity, and the plant growth speed is increased. However, when the illumination intensity exceeds the light saturation point, the illumination intensity is increased, the photosynthesis intensity is not increased any more, and even the plant growth inhibition, leaf scorch and other diseases can be caused by the too strong illumination. Therefore, the power of the plant growth light supplementing lamp needs to be adjusted along with the change of the illumination intensity in the daytime so as to maintain the illumination intensity in the greenhouse within the optimal illumination intensity range required by photosynthesis of vegetables planted in the greenhouse.
Further, the heat exchange system of the vegetable greenhouse transmits the waste heat of circulating cooling water and the waste heat of tail gas of the anaerobic fermentation biogas power station into the greenhouse, the average temperature in the greenhouse is maintained in a temperature range suitable for growing vegetables in the greenhouse, the total heat power of the heat exchange system in the full-flow operation of a heat medium and the full-power operation of an electric warm air blower is required to meet the requirement that the real-time average temperature in the greenhouse space can be maintained above the lower limit of the temperature range suitable for growing vegetables in the greenhouse, the heat exchange system is firstly adopted to heat the greenhouse, and when the heat exchange system cannot meet the temperature-rising requirement of the greenhouse in the full-flow operation of the heat medium, the electric warm air blower is started to assist in temperature rising. The heat energy required to maintain the proper temperature in the greenhouse has a great relationship with the illumination and the outside ambient temperature. In fact, the condition of large heat energy demand in the greenhouse is mostly occurred in the nighttime (17:00 to 8:00 of the next day) in winter and in the daytime of insufficient illumination, if the heat energy supply is insufficient, the temperature of the greenhouse is too low, poor growth of vegetables is caused by light weight, and the freezing injury of vegetables is possible to occur in heavy weight. In addition, the biogas power generation waste heat is preferably used for maintaining the temperature of the anaerobic fermentation tank and heating the internal living office area in winter, and the rest electric energy and waste heat can be transmitted to the vegetable planting greenhouse. During the winter night and the daytime when the illumination is insufficient, the thermal energy requirements of these functional areas can also be greatly increased, resulting in a reduction in the thermal energy that can be delivered to the greenhouse. Therefore, an electric auxiliary heating device is needed to be added to provide auxiliary heating for the greenhouse when the waste heat generated by methane power generation cannot meet the greenhouse heating requirement. The heat exchange system supplies heat to the greenhouse by using the waste heat generated by biogas generation, and the electric heater supplies heat to the greenhouse by using the electric energy generated by biogas generation.
Further, CO in tail gas of anaerobic fermentation biogas power generation 2 CO in greenhouse space 2 The average concentration is maintained in the interval of 0.1-0.15% of the required concentration of vegetable growth planted in the greenhouse, and the allowable adding time period of anaerobic fermentation biogas tail gas is 9 in one day: 00 to 16:00, the adding flow is less than 10L/(m) 3 ·h)。CO 2 Especially important for planting vegetables in greenhouse in winter, because the atmosphere in the greenhouse is relatively isolated from the atmosphere in the external environment, the photosynthesis of the vegetables in the greenhouse can continuously consume CO in the greenhouse 2 Such as the inability to obtain CO in the external environment 2 The replenishment can cause the vegetables to be 'carbon starved', the growth vigor of the vegetables is reduced, sub-health states such as yellow leaves, green loss and the like appear, and even the vegetables stop growing and die when serious. Meanwhile, related researches show that CO in the air 2 The concentration (0.03%) is far from that of most cropsOptimum CO for use 2 Concentration (typically 0.1% -0.15%), which indicates that the CO in the air is under sufficient sunlight during the day 2 The concentration becomes a limiting factor in crop growth. The practical result of agricultural production shows that the CO in the greenhouse is improved and maintained by applying the air fertilizer (diesel air furnace, firewood burning, slow release granular gas fertilizer and the like) in the greenhouse 2 The concentration can increase the yield of vegetables in the greenhouse by 10% -30%, and the incidence rate is reduced by more than 30%. Lifting CO in greenhouse by using biogas power generation tail gas 2 The method is similar to the firewood burning mode in nature, but has the advantage of recycling waste. CO in tail gas of biogas power generation 2 The content is up to 15% -17%, and the optimum CO for plant growth 2 The concentration interval is generally 0.1-0.15%, so that methane power generation tail gas is added into the greenhouse to promote CO in the greenhouse 2 The manner of concentration is possible. And compared with the extensive CO addition of firewood 2 In the mode, the biogas power generation tail gas is fed into the greenhouse, and the air supply amount can be regulated through the valve, so that CO in the greenhouse can be regulated 2 The concentration is stabilized at a proper level for vegetable growth. To ensure CO added in the mode of biogas power generation tail gas 2 The greenhouse vegetable energy-saving device can be fully utilized by greenhouse vegetables in time, and the adding time of the biogas power generation tail gas corresponds to the time of full photosynthesis of the vegetables, so that the adding time period of the biogas power generation tail gas is when the illumination (comprising sunlight and plant growth light supplementing lamps) is sufficient in daytime. And consider that vegetable respiration at night causes CO in the greenhouse 2 The concentration is increased, and the adding time of the biogas power generation tail gas is delayed to a certain extent. The biogas power generation tail gas is uniformly diffused to the greenhouse space through the internal circulating fan for a certain time, and the control of the flow of the biogas power generation tail gas can avoid the overhigh concentration of the tail gas in the local space in the greenhouse (namely CO) 2 Too high a concentration) adversely affects respiration of the vegetables.
Further, the heat exchange system comprises a heat exchanger, an internal circulation fan and a ventilation fan, wherein the heat exchanger is used for controlling the flow of a heat medium through a valve and adjusting the heat exchange power of the heat exchange system, and the positions of an air outlet of an exhaust pipe in a greenhouse, an air outlet of an electric heating fan and an air outlet of the ventilation fan are adjustedAt the air inlet of the internal circulation fan, the air outlet of the internal circulation fan faces the heat exchanger, the air outlet of the internal circulation fan faces upwards, and the temperature of the air outlet is not high at 35 ℃. The internal circulation fan runs continuously at constant power for 24h, and the circulation flow of the internal circulation fan ensures the temperature and CO in the greenhouse space served by the internal circulation fan 2 The concentration was as uniform as possible. The internal circulation fan is used for dispersing and homogenizing hot air and CO 2 Can maintain the temperature and CO in the greenhouse space 2 The concentration was uniform and constant. When entering the night, the vegetables no longer need CO 2 The heat supply is still needed to maintain the proper temperature in the greenhouse, and the internal circulation fans only play a role of diffusing the homogeneous hot air. The greenhouse is also provided with a ventilation fan for introducing fresh air of an external environment into the greenhouse, the ventilation frequency of the ventilation fan is more than 1 time/3 days, the ventilation amount of each ventilation is 2-3 times of the space volume of the greenhouse served by the ventilation fan, and the ventilation flow is less than 1/10 of the circulation flow of the internal circulation fan. Although the biogas power generation tail gas is pretreated to remove most of pollutants, the biogas power generation tail gas still contains trace SO 2 Smoke dust and nitrogen oxides, the greenhouse enclosed space is easy to cause accumulation of pollutants, and the physical health of workers working in the greenhouse is endangered, so that the greenhouse needs to be ventilated regularly, and sufficient ventilation frequency and ventilation amount are ensured to control the pollutant concentration of the greenhouse at a safe level. Because the ventilation fan directly introduces the external atmosphere with lower temperature, the air inlet flow needs to be controlled to avoid the damage to greenhouse vegetables caused by cold air impact. The hot air for greenhouse heating, the cold air for ventilation and the biogas power generation tail gas are diffused and homogenized into the greenhouse space by the internal circulation fan, and in order to ensure effective diffusion of cold and hot air and biogas power generation tail gas, the tail gas outlet and the hot air source are both positioned at the air inlet of the internal circulation fan. In order to avoid that hot air with higher temperature is directly blown onto greenhouse vegetables, the air outlet of the internal circulation fan should be upward. In addition, in order to avoid the damage to vegetables caused by local temperature rise and overhigh temperature in the greenhouse, the temperature of the air outlet of the internal circulation fan cannot be overhigh.
Further, the heat exchange system of the vegetable greenhouse is a heat exchange system formed by reforming a greenhouse framework and comprises a hollow structureThe heat exchange arched girder and the air conveying arched girder of the structure are alternately arranged to form a greenhouse main body framework, one side of the greenhouse framework is provided with a waste heat conveying pipe and a tail gas conveying pipe along the length direction, the other side of the greenhouse framework is provided with a waste heat return pipe, one end of the heat exchange arched girder is connected to the waste heat conveying pipe through a first connecting pipe, the other end of the heat exchange arched girder is connected to the waste heat return pipe through a second connecting pipe, one end of the air conveying arched girder is connected to the tail gas conveying pipe through a third connecting pipe, the tail gas conveying pipe is connected to an air outlet of the electric warming fan, an air inlet of the electric warming fan is connected to the tail gas pipe, air inlets are also connected to the tail gas pipe, valves are arranged on the tail gas pipe and the air inlets, and exhaust pipes are arranged on vertical faces corresponding to the two ends of the air conveying arched girder; the vegetable greenhouse also comprises a ventilation fan, wherein the ventilation fan is arranged on the vegetable greenhouse. Utilize arched girder structure of current vegetable greenhouse, reform transform the greenhouse main part, make greenhouse main part self form a heat exchange system and CO 2 The supply system forms a double-system structure, and can form uniform heat exchange and uniform supply of CO2 gas in the greenhouse by only modifying the existing greenhouse, and the concrete modification is that the greenhouse arched beams are equally divided into heat exchange arched beams and gas conveying arched beams, two ends of the heat exchange arched beams are respectively connected with a waste heat conveying pipe and a waste heat return pipe in an opening mode, so that the heat exchange arched beams form an independent heat exchanger. The heat exchange system of the vegetable greenhouse can reduce the investment of heat exchange equipment in the greenhouse and reduce the cost.
The vegetable greenhouse also comprises a ventilation fan, wherein the ventilation fan is arranged on the vegetable greenhouse and is used for introducing fresh air of an external environment into the greenhouse.
Further, what is said is The exhaust pipes at the two ends of the air conveying arched girder are arranged in a relatively inclined manner, and the blown-out air flow can form closed-loop air flow in the vegetable greenhouse. The closed-loop airflow can ensure the temperature and CO in the greenhouse space 2 The concentration was further homogenized. The exhaust pipe is used for diffusing and homogenizing hot air and CO 2 Can maintain the temperature and CO in the greenhouse space 2 The concentration was uniform and constant. When entering the night, the vegetables no longer need CO 2 The supply, but still the heat supply is required to maintain the proper temperature in the greenhouse, the exhaust duct 49 now only takes on the effect of diffusing the homogenized hot air.
Further, a plurality of cooling fins are arranged below the top of the heat exchange arched girder along the length direction, the bottom of the heat exchange arched girder is provided with a drill hole for connecting the cooling fins, the inside of the cooling fins is hollow, the cavity of the cooling fins is communicated with the inside of the heat exchange arched girder, the heat dissipation area of the single heat exchange arched girder can be increased by the arrangement of the cooling fins, the heat exchange efficiency is improved, and the temperature rise in the vegetable greenhouse is facilitated.
Compared with the prior art, the thermoelectric comprehensive utilization method for anaerobic fermentation biogas provided by the invention has the beneficial effects that:
(1) The comprehensive utilization method of anaerobic fermentation biogas thermoelectric provides a new implementation method for the biogas 'cogeneration' technology, provides an on-site or near-site utilization way for biogas 'thermoelectric', and has the advantages of low construction investment and high heat utilization rate. Meanwhile, the utilization way of the biogas power generation tail gas is increased on the basis, and the CO of the biogas power generation tail gas can be realized 2 The source of emissions is curtailed.
(2) The biogas power generation of the invention provides power for the plant growth light supplementing lamp in the greenhouse, maintains the illumination intensity in the greenhouse within the optimal illumination intensity range required by photosynthesis of vegetables planted in the greenhouse, can promote the growth of the vegetables, shortens the growth period of the vegetables, and increases the yield. In addition, the plant growth light supplementing lamp can enable melon and fruit vegetables (such as tomatoes, eggplants, cucumbers and the like) with higher illumination requirements to be planted in the greenhouse in winter through increasing the illumination intensity in the greenhouse and prolonging the illumination time.
(3) The invention utilizes the waste heat of methane power generation to heat the winter vegetable greenhouse, maintains the average temperature in the greenhouse in a temperature range suitable for growing vegetables in the greenhouse, and avoids slow growth and even low-temperature freezing injury of vegetables caused by too low temperature. The heat exchange power of the heat exchange system can be adjusted, so that the accumulation of sugar in melons and fruits vegetables can be promoted by actively controlling the day-night temperature difference in the greenhouse, and the quality of the vegetables can be improved. The recycling of the waste heat of the biogas power generation can greatly improve the energy utilization rate of the biogas power station, and is a specific measure for energy conservation and emission reduction. The electric heating fan is used as an auxiliary heating means of the greenhouse, and auxiliary heating is provided for the greenhouse when the waste heat generated by biogas generation cannot meet the greenhouse heating requirement. The on-site or near-site utilization of biogas generation also reduces the investment, power consumption and running cost of the transmission line and its ancillary facilities.
(4) Lifting and maintaining CO in greenhouse by utilizing biogas power generation tail gas 2 Concentration of CO in the space of the service greenhouse 2 Optimum CO for vegetable growth grown in greenhouse with average concentration 2 In the concentration interval, the growth of vegetables can be promoted, the yield is greatly improved, and the plant diseases and insect pests are obviously reduced. At the same time, CO 2 Is a greenhouse gas, and has higher CO in the greenhouse 2 The concentration also improves the winter heat preservation performance of the greenhouse to a certain extent. The utilization of the biogas power generation tail gas can realize the CO of the biogas power generation tail gas 2 The source of emissions is curtailed.
(5) The heat exchange system formed by reforming the greenhouse framework can enable the greenhouse main body to form a heat exchange system and CO 2 The supply system forms a double-system structure, can realize uniform heat exchange in the greenhouse and uniform supply of CO2 gas, can reduce equipment investment for heat exchange in the greenhouse, and reduces cost.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the method of the invention for the comprehensive utilization of the heat and electricity of anaerobic fermentation biogas;
Fig. 2 is a system block diagram concerning a heat exchange system in embodiment 1;
fig. 3 is a schematic view of the structure of the heat exchange system in embodiment 2;
FIG. 4 is a schematic view of a greenhouse skeleton structure after modification of the heat exchange system in example 2;
FIG. 5 is a schematic view of embodiment 2 regarding the formation of a closed loop air flow in a vegetable greenhouse in a heat exchange system;
FIG. 6 is a schematic view of a greenhouse skeleton structure after modification in a heat exchange system according to example 3;
marked in the figure as: 1. the anaerobic fermentation biogas power station comprises an anaerobic fermentation biogas power station 11, a heating power pipeline 12, a tail gas pipe 13, an air inlet pipe 14 and a valve; 2. a plant growth light supplementing lamp; 3. an electric warm-air machine; 41. heat exchange arched girders, 411, radiating fins, 42, gas conveying arched girders, 43, waste heat conveying pipes, 44, tail gas conveying pipes, 45, waste heat return pipes, 46, first connecting pipes, 47, second connecting pipes, 48, third connecting pipes, 49 and exhaust pipes; 5. a heat exchanger; 6. an internal circulation fan; 7. and a ventilation fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "… …" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "provided," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The structural features of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1-2, the present embodiment is a pilot experiment, where a livestock and poultry raising enterprise is located in a centralized pig farm in henna. The average daytime temperature in winter in the land is 8 ℃, the average nighttime temperature in winter is-3 ℃, and the minimum winter temperature can reach-10 to-15 ℃. The pig farm occupies about 50 mu, and breeds about 1.5 thousands of pigs altogether. The daily sewage output of the pig farm is 300-350 m 3 And/d, the sewage sources are the pig farm cultivation wastewater (including pig manure, pig urine and flushing water) and the pig farm staff domestic water, and the water quality conditions are shown in table 1. The pig farm sewage treatment unit is provided with 4 large CSTR anaerobic fermentation tanks, and the volume of each tank body is 2000m 3 Adopts medium temperature fermentation (38-42 ℃), and the HRT is 22-26 d. The total biogas yield of the anaerobic fermentation system is 270-310 m 3 /d, biogas CH 4 The concentration was 62%. The biogas generator set adopted in the pig farm comprises a PowerLink gas generator set and a set of 100 kW.h ternary lithium battery pack energy storage system, and the model specification and the winter (1 month) running condition of the biogas generator set are shown in Table 2. Before the implementation of the embodiment, the power of the biogas generator set is used for maintaining the daily operation (daily consumption of 310-340 kW.h) of a live pig farm (pigsty ventilation illumination, staff living office) and a sewage treatment facility (comprising an anaerobic fermentation tank) in winter, and the rest power (about 210-300 kW.h) is supplied to nearby residents through a low-voltage transmission line 。
TABLE 1 pig farm wastewater quality conditions
Table 2 biogas generating set specifications and operating conditions
The pilot test time is 2020.11-2021.2, and the test field is the farm land outside the fence of the live pig farm. And (3) building a vegetable planting greenhouse with the height of 3m, the width of 6m and the length of 25m on a test site, wherein the greenhouse adopts a PE transparent plastic film, and the nearest point distance between a biogas power station and the vegetable planting greenhouse is about 650m. 5 kinds of vegetables, including Chinese cabbage, lettuce, spinach, white radish and tomato, are planted in the greenhouse. Among the vegetables in the above item 5, cabbage, lettuce and spinach are leaf vegetables, white radish is root vegetables, and tomato is fruit vegetables. The Chinese cabbage, lettuce, spinach and white radish are planted by seeds, and the tomato is planted by young plants. The planting area of each vegetable is 25m 2 。
The comprehensive utilization method of anaerobic fermentation biogas thermoelectric in the embodiment specifically comprises the following 3 aspects: 1) Greenhouse utilization of biogas power generation; 2) Greenhouse utilization of waste heat generated by biogas generation; 3) Greenhouse utilization of biogas power generation tail gas. Firstly, maintaining normal operation of an anaerobic fermentation unit and a production living area by utilizing electric energy generated by an anaerobic fermentation biogas power station 1, and then using residual electric energy and waste heat of the anaerobic fermentation biogas power station 1 and anaerobic fermentation biogas power generation tail gas for planting greenhouse vegetables in winter; the waste heat of the anaerobic fermentation biogas power station 1 is connected to a heat exchange system of the vegetable greenhouse through a heating pipeline 11 in a heat medium mode, heat exchange is carried out for increasing the temperature of the vegetable greenhouse, and the residual electric energy of the anaerobic fermentation biogas power station 1 is connected with plant growth in the vegetable greenhouse The light supplementing lamp 2 and the electric warm air blower 3 are connected into the vegetable greenhouse by the tail gas pipe 12 of the anaerobic fermentation biogas power station 1, and CO in the tail gas is utilized to provide electricity and auxiliary heat for the greenhouse by utilizing the electric warm air blower 3 2 Lifting and maintaining CO in greenhouse 2 Concentration.
The biogas for biogas power generation is subjected to desulfurization pretreatment, and the tail gas of biogas power generation is subjected to dust removal and denitration treatment. H of biogas entering into biogas generator set after treatment 2 S concentration is lower than 20mg/m 3 SO in the tail gas of methane power generation 2 The concentration is lower than 10mg/m 3 The smoke concentration is lower than 5mg/m 3 Nitrogen oxides (in NO 2 Meter) concentration of less than 60mg/m 3 . In the greenhouse operation period of 4 months, SO in the greenhouse 2 The highest recorded concentrations of TSP and nitrogen oxides were 60. Mu.g/m, respectively 3 、110μg/m 3 And 90. Mu.g/m 3 Meets the secondary concentration limit standard of environmental air quality standard (GB 3095-2012).
The electric energy generated by biogas is preferentially used for maintaining normal operation of daily operations of pig farms (piggery ventilation lighting, working staff living offices) and sewage treatment facilities (including anaerobic fermentation tanks), and the residual electricity is used for vegetable greenhouses and supplied to nearby residents through low-voltage transmission lines. The waste heat is preferentially used for maintaining the temperature of the anaerobic fermentation tank and heating the live pig farm in winter (pig house heating and working office heating of staff), and the rest waste heat is conveyed to the vegetable planting greenhouse.
The greenhouse utilization way for generating electricity by using methane mainly comprises the following 3 aspects: 1) Providing power for the circulating cooling water and tail gas of the biogas generator to be conveyed to the greenhouse unit; 2) Providing power for the ventilation fan 7 and the internal circulation fan 6; 3) Providing power for the plant growth light supplementing lamp 2; 4) The electric warm air blower 3 is utilized to provide power for the greenhouse for auxiliary heating.
When the plant growth light supplementing lamp 2 is used for supplementing light to greenhouse vegetables, the light supplementing time period is 8 in one day: 00 to 17:00, and the illumination intensity of the light supplementing lamp is adjusted according to the illumination intensity of sunlight in the greenhouse (comprising the step of closing the light supplementing lamp), so that the illumination intensity in the greenhouse is maintained within the optimal illumination intensity range required by photosynthesis of vegetables planted in the greenhouse. Light supplementing lamp for plant growth in greenhouse2 adopts an LED light supplementing lamp, the LED light supplementing lamp adopts red and blue double-color lamp beads, the power of a single lamp is 110W, the power is 0-110W and is adjustable, and the designed service area is about 2m 2 . The number of the LED plant growth light supplementing lamps 2 is 15 in the greenhouse. An illumination sensor is arranged in each vegetable growing area, and the illumination intensity is measured in real time through the illumination sensor and the power of the light supplementing lamp is controlled (including the light supplementing lamp is turned off). The light supplement conditions of the plant lamps for 5 vegetables planted in the greenhouse of the greenhouse are shown in Table 3.
Table 3 light intensity of the 5 kinds of vegetables in the greenhouse
| Sequence number | Vegetable variety | Light supplementing intensity (Lux) |
| 1 | Chinese cabbage | 15000 |
| 2 | Lettuce | 8000 |
| 3 | Spinach | 8000 |
| 4 | White radish | 20000 |
| 5 | Tomato (tomato) | 32000 |
Remarks: the light supplementing intensity is the illumination intensity which is achieved by the plant lamp and the sunlight together, and when the sunlight intensity reaches the light supplementing intensity in the table, the plant lamp light supplementing is stopped.
The greenhouse utilizing way of the biogas power generation waste heat is that the circulating cooling water waste heat and the tail gas waste heat of the biogas power generator are transmitted into the greenhouse through a heat exchange system, and the average temperature in the greenhouse is maintained in a temperature range suitable for growing vegetables in the greenhouse. The heat exchange system inside the greenhouse comprises a heat exchanger 5, an internal circulation fan 6 and a ventilation fan 7. The heat exchanger 5 controls the flow of the heat medium (including completely cutting off the heat medium) through the valve 14, so as to realize the adjustment of the heat exchange power of the heat exchange system. The internal circulation fan 6 runs continuously for 24 hours with constant power. The greenhouse size for pilot test is: height 3m, width 6m, length 25m. The greenhouse uses a set of heat exchange system and an electric warm air blower 3, and the specific model parameters are shown in table 4.
Table 4 Heat exchange System and specific model parameters of electric Fan
The greenhouse utilization way of the biogas power generation tail gas is to utilize CO in the tail gas 2 Lifting and maintaining CO in greenhouse 2 Concentration of CO in the space of the service greenhouse 2 Optimum CO for vegetable growth grown in greenhouse with average concentration 2 In the concentration interval, the adding period of the biogas power generation tail gas is 9 in one day: 00 to 16:00, the adding flow is 50L/h.
The temperature and CO are respectively set at 0m, 5m, 10m, 15m, 20m and 25m from the initial section of the greenhouse 2 Concentration on-line monitoring control point, setting average temperature in greenhouse at 19-22 deg.C, average CO 2 The concentration is 0.08 to 0.11 percent. When the average temperature in the greenhouse is lower than 19 ℃, starting a heat exchange system and starting the electric warm air blower 3 if necessary; and when the average temperature in the greenhouse is higher than 22 ℃, the heat exchange system is closed. When CO in greenhouse 2 When the average concentration is lower than 0.08%, starting biogas power generation tail gas adding; when CO in greenhouse 2 When the average concentration is 0.11%, the addition of the biogas power generation tail gas is closed.
The air outlet of the tail air pipe 12 in the greenhouse, the air outlet of the electric warm-air blower 3 and the air outlet of the ventilation blower 7 are positioned at the air inlet of the internal circulation blower 6, the air outlet of the internal circulation blower 6 is opposite to the heat exchanger 5, the air outlet of the internal circulation blower 6 is upward, and the temperature of the air outlet is not higher than 35 ℃.
When 5 vegetables reached the harvest requirement, the vegetables in the pilot test greenhouse were picked and weighed to give the vegetable yields shown in table 5.
Table 5 5 yield of vegetables (including pilot plant test greenhouse and local greenhouse)
Remarks: the actual harvest period of tomatoes is the earliest harvest period of a batch of fruits; the average mass of a single tomato plant (individual) is the average mass of a single mature fruit.
Vegetable planting in the pilot test greenhouse adopts a local experienced greenhouse vegetable planter to plant, and the planting density and the planting conditions such as water, fertilizer and pesticide are the same as those of the local greenhouse. As can be seen from the data in Table 5, the harvest period of the Chinese cabbage, lettuce, spinach, white radish and tomato in the pilot test greenhouse is 6 days, 5 days, 3 days, 0 day and 3 days earlier than that in the local common greenhouse, the average mass improvement amplitude of the single plant(s) is (are) 26%, 19%, 22%, 15% and 22%, respectively, and the yield improvement amplitude (reduced) per mu is (are) 17%, 6%, 8%, 15% and 15%, respectively. In general, under the same planting conditions of planter, planting density, water fertilizer, pesticide and the like, the pilot test greenhouse vegetable of the invention has a significantly shorter harvest time and a higher single than the local common greenhouse vegetableThe average mass and (folded) yield per mu of plants, which may benefit from pilot plant test greenhouses, have the following advantages: 1) The waste heat and the electric auxiliary heat of methane power generation build a more suitable and stable vegetable growth temperature (19-22 ℃); 2) The plant growth light supplementing lamp provides more sufficient and stable illumination conditions for the growth of vegetables in winter; 3) CO is provided for vegetables in greenhouse by utilizing biogas power generation tail gas 2 The carbon source for vegetable growth is always kept sufficient and stable within the optimal concentration range (0.08-0.11%) required by vegetable growth.
Example 2
Referring to fig. 3 to 5, as another preferred embodiment of the present invention, the difference from embodiment 1 is that the heat exchange system is a heat exchange system formed by reforming a greenhouse frame, and comprises a heat exchange arched beam 41 and an air conveying arched beam 42 with hollow structures, wherein the heat exchange arched beam 41 and the air conveying arched beam 42 are alternately arranged to form a greenhouse main body frame, a waste heat conveying pipe 43 and a tail gas conveying pipe 44 are arranged on one side of the greenhouse frame along the length direction, a waste heat return pipe 45 is arranged on the other side of the greenhouse frame, one end of the heat exchange arched beam 41 is connected to the waste heat conveying pipe 43 through a first connecting pipe 46, the other end is connected to the waste heat return pipe 45 through a second connecting pipe 47, one end of the air conveying arched beam 42 is connected to the tail gas conveying pipe 44 through a third connecting pipe 48, the tail gas conveying pipe 44 is connected to an air outlet of the electric heating fan 3, an air inlet of the electric heating fan 3 is connected to the tail gas pipe 12, an air inlet pipe 13 is also connected to the tail gas pipe 12, valves 14 are arranged on the tail gas pipe 12 and the air inlet pipe 13, and exhaust pipes 49 are arranged on corresponding vertical surfaces on both ends of the air conveying arched beam 42. Utilize arched girder structure of current vegetable greenhouse, reform transform the greenhouse main part, make greenhouse main part self form a heat exchange system and CO 2 The supply system forms a double-system structure, and can form uniform heat exchange and uniform supply of CO2 gas in the greenhouse by only modifying the existing greenhouse, and the concrete modification is that the greenhouse arched beams are equally divided into heat exchange arched beams 41 and gas conveying arched beams 42, two ends of the heat exchange arched beams 41 are respectively connected with a waste heat conveying pipe 43 and a waste heat return pipe 44 in an open pore mode, so that the heat exchange arched beams 41 form an independent heat exchanger, and the heat pipeline 11 can be provided by adopting the heat exchange arched beams 41 which are arranged at intervalsWaste heat is evenly distributed in the greenhouse, CO2 gas in biogas power generation tail gas can be directly and evenly supplied into the greenhouse by adopting the gas conveying arched girder 42, the electric warm air blower 3 is connected to the tail gas pipe 12, heating of the tail gas can be realized, power supply and auxiliary heating for the greenhouse are realized, the flow of heat medium is controlled through the valve 14, the heat exchange power of the heat exchange system is adjusted, when auxiliary heating is needed at night, the valve 14 on the tail gas pipe 12 is closed, and the valve 14 on the air inlet pipe 13 is opened. The heat exchange system of the vegetable greenhouse can reduce the investment of heat exchange equipment in the greenhouse and reduce the cost.
The exhaust pipes 49 at the two ends of the air conveying arched girder 42 are arranged in a relatively inclined way, the blown air flow can form a closed loop air flow in the vegetable greenhouse, and the closed loop air flow can ensure the temperature and CO in the greenhouse space 2 The concentration was further homogenized. The exhaust pipe 49 carries the diffused and homogenized hot air and CO 2 Can maintain the temperature and CO in the greenhouse space 2 The concentration was uniform and constant. When entering the night, the vegetables no longer need CO 2 The supply, but still the heat supply is required to maintain the proper temperature in the greenhouse, the exhaust duct 49 now only takes on the effect of diffusing the homogenized hot air.
Still include ventilator 7, ventilator 7 sets up on vegetable greenhouse, ventilator 7 is used for introducing the fresh air of external environment in the greenhouse.
Specifically, when in use, the average temperature in the greenhouse is set to be 19-22 ℃ and the average CO 2 The concentration is 0.08 to 0.11 percent. When the average temperature in the greenhouse is lower than 19 ℃, starting a heat exchange system and starting the electric warm air blower 3 if necessary; and when the average temperature in the greenhouse is higher than 22 ℃, the heat exchange system is closed. When CO in greenhouse 2 When the average concentration is lower than 0.08%, starting biogas power generation tail gas adding; when CO in greenhouse 2 When the average concentration is 0.11%, the addition of the biogas power generation tail gas is closed.
Example 3
Referring to fig. 6, as another preferred embodiment of the present invention, there is a difference from embodiment 2 in that a plurality of heat radiation fins 411 are provided in a length direction under the top of the heat exchange arch 41, the bottom of the heat exchange arch 41 is provided with a drilled hole for connecting the heat radiation fins 411, the heat radiation fins 411 are hollow inside, and the hollow thereof communicates with the inside of the heat exchange arch 41. The heat radiating area of a single heat exchange arched girder can be increased by arranging the heat radiating fins, so that the heat exchange efficiency is improved, and the temperature rise in the vegetable greenhouse is facilitated.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The comprehensive utilization method of the thermoelectricity of anaerobic fermentation biogas is characterized by comprising the following steps: firstly, maintaining normal operation of an anaerobic fermentation unit and a production living area by utilizing electric energy generated by an anaerobic fermentation biogas power station (1), and then using residual electric energy and waste heat of the anaerobic fermentation biogas power station (1) and anaerobic fermentation biogas power generation tail gas for planting greenhouse vegetables in winter;
the waste heat of the anaerobic fermentation biogas power station (1) is connected to a heat exchange system of the vegetable greenhouse through a heating pipeline (11) in a heat medium mode, heat exchange is carried out to raise the temperature of the vegetable greenhouse, residual electric energy of the anaerobic fermentation biogas power station (1) is connected with a plant growth light supplementing lamp (2) and an electric heating fan (3) in the vegetable greenhouse, the electric heating fan (3) is utilized to provide power for the greenhouse for auxiliary heating, a tail gas pipe (12) of the anaerobic fermentation biogas power station (1) is connected into the vegetable greenhouse, and CO in tail gas is utilized 2 Lifting and maintaining CO in greenhouse 2 Concentration.
2. The method for comprehensively utilizing the heat and electricity of anaerobic fermentation biogas according to claim 1, wherein the closest point distance between the anaerobic fermentation biogas power station (1) and the vegetable planting greenhouse is not more than 2km.
3. Root of Chinese characterThe method for comprehensively utilizing the heat and electricity of anaerobic fermentation biogas as claimed in claim 1, wherein the anaerobic fermentation biogas power station (1) consists of a biogas generator set and a battery pack energy storage system, the anaerobic fermentation biogas yield is greater than the air inflow of the biogas generator set which keeps 80% of load operation for 24H and is smaller than the air inflow of the biogas generator set which runs at full load for 24H, the battery pack energy storage system stores not less than the requirement of 2H of the full load operation power generation of the biogas generator set, and the biogas generated by the anaerobic fermentation biogas power station (1) is subjected to desulfurization pretreatment to ensure H 2 S content is less than 20mg/m 3 The tail gas of methane power generation should be subjected to dust removal and denitration treatment, and the smoke concentration in the tail gas is lower than 5mg/m 3 Nitrogen oxide concentration lower than 100mg/m 3 。
4. The method for comprehensively utilizing the heat and electricity of anaerobic fermentation biogas according to claim 1, wherein when the plant growth light supplementing lamp (2) is used for supplementing light to greenhouse vegetables, the light supplementing time period is 8:00 to 17:00, when in light supplementing, the light intensity of the light supplementing lamp is adjusted according to the sunlight light intensity in the greenhouse, so that the light intensity in the greenhouse is maintained within the light intensity range required by photosynthesis of vegetables planted in the greenhouse.
5. The comprehensive utilization method of the heat and electricity of anaerobic fermentation biogas as claimed in claim 1, wherein the heat exchange system of the vegetable greenhouse transmits the waste heat of circulating cooling water and the waste heat of tail gas of the anaerobic fermentation biogas power station (1) into the greenhouse, the average temperature in the greenhouse is maintained in a temperature range suitable for growing vegetables in the greenhouse, the total heat power of the heat exchange system in the full-flow operation of a heat medium and the full-power operation of the electric warming fan (3) is required to be more than the lower limit of the temperature range suitable for growing vegetables in the greenhouse, the heat exchange system is adopted to heat the greenhouse, and when the heat exchange system in the full-flow operation of the heat medium cannot meet the temperature-rising requirement of the greenhouse, the electric warming fan (3) is started to assist in heating.
6. The method for comprehensively utilizing the heat and electricity of anaerobic fermentation biogas as claimed in claim 1, wherein CO in the tail gas generated by anaerobic fermentation biogas is 2 CO in greenhouse space 2 The average concentration is maintained in the interval of 0.1-0.15% of the required concentration of vegetable growth planted in the greenhouse, and the allowable adding time period of anaerobic fermentation biogas tail gas is 9 in one day: 00 to 16:00, the adding flow is less than 10L/(m) 3 ·h)。
7. The comprehensive utilization method of the hot air of anaerobic fermentation biogas according to claim 1, wherein the heat exchange system comprises a heat exchanger (5), an inner circulating fan (6) and a ventilation fan (7), the heat exchanger (5) is used for controlling the flow of the heat medium through a valve (14) for adjusting the heat exchange power of the heat exchange system, an air outlet of an air tail pipe (12) in a greenhouse, an air outlet of an electric warm air blower (3) and an air outlet of the ventilation fan (7) are positioned at the air inlet of the inner circulating fan (6), the air outlet of the inner circulating fan (6) is opposite to the heat exchanger (5), the air outlet of the inner circulating fan (6) is upward, and the temperature of the air outlet is not high at 35 ℃.
8. The comprehensive utilization method of the heat and electricity of anaerobic fermentation biogas according to claim 1, wherein the heat exchange system is formed by reforming a greenhouse skeleton and comprises heat exchange arched beams (41) and air conveying arched beams (42) with hollow structures, the heat exchange arched beams (41) and the air conveying arched beams (42) are alternately arranged to form a greenhouse main skeleton, a waste heat conveying pipe (43) and a tail gas conveying pipe (44) are arranged on one side of the greenhouse skeleton along the length direction, a waste heat return pipe (45) is arranged on the other side of the greenhouse skeleton, one end of the heat exchange arched beams (41) is connected to the waste heat conveying pipe (43) through a first connecting pipe (46), the other end of the heat exchange arched beams (41) is connected to the waste heat return pipe (45) through a second connecting pipe (47), one end of the air conveying arched beams (42) is connected to the tail gas conveying pipe (44) through a third connecting pipe (48), the tail gas conveying pipe (44) is connected to an air outlet of a tail gas fan (3), an air inlet of the tail gas fan (3) is connected to the tail gas pipe (12), an air inlet of the electric heater (12) is connected to the air inlet pipe (12), and two air inlet pipes (14) are connected to the air inlet pipes (14) and two corresponding air inlet pipes (14);
The vegetable greenhouse also comprises a ventilation fan (7), wherein the ventilation fan (7) is arranged on the vegetable greenhouse.
9. The comprehensive utilization method of the thermoelectricity of anaerobic fermentation biogas according to claim 1, wherein the exhaust pipes (49) at two ends of the gas conveying arched girder (42) are arranged obliquely relatively, and the blown-out air flow can form a closed-loop air flow in the vegetable greenhouse.
10. The comprehensive utilization method of the thermoelectricity of anaerobic fermentation biogas according to claim 1, wherein a plurality of cooling fins (411) are arranged below the top of the heat exchange arched beam (41) along the length direction, holes for connecting the cooling fins (411) are arranged at the bottom of the heat exchange arched beam (41), the inside of the cooling fins (411) is hollow, and the cavity of the cooling fins is communicated with the inside of the heat exchange arched beam (41).
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