A multi-energy complementary recycling system and application method for facility agriculture

Abstract

A multi-energy complementary recycling system and application method for facility agriculture. The multi-energy complementary energy control system intelligently and uniformly dispatches electricity from wind power generation systems, municipal power grids, gas-fired distributed generator sets and solar power generation systems to supply electricity for production and life. The gas-fired distributed generator sets use municipal gas or biogas from biogas digesters to generate electricity. The flue gas waste heat of the gas-fired distributed generator sets provides thermal energy for planting greenhouses, biogas digesters, livestock and poultry breeding and aquaculture. The solar power generation system is arranged on the roof of the planting greenhouse. The planting greenhouse provides green fodder for livestock and poultry breeding and aquaculture, and the planting greenhouse, livestock and poultry breeding and aquaculture jointly provide biogas raw materials for biogas digesters. The biogas digesters provide biogas for the gas-fired distributed generator sets and fertilizer for the planting greenhouses at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of energy supply, and in particular relates to a multi-energy complementary recycling system and an application method for facility agriculture. Background Art

[0002] Facility agriculture is a production method that comprehensively applies engineering equipment technology, biotechnology and environmental technology. By adopting certain facilities and devices, it improves or creates environmental meteorological factors in a local area in accordance with the optimal environment required for the growth and development of plants and animals, so that plants or animals can obtain the best growth environment, such as greenhouses, sheds, agricultural factories, factory farms, etc.

[0003] In order to achieve and maintain the best growth environment for plants and animals, facility agriculture needs to consume a large amount of electricity, heat, cold and other energy. Energy costs account for about 15% to 40% of the total cost of facility agriculture production. Therefore, the security of energy supply directly affects the normal production of facility agriculture; the cost of energy directly affects the production cost of facility agriculture; the way of obtaining energy directly determines the emission level of CO2 and pollutants in facility agriculture.

[0004] There are two main types of energy for facility agriculture, namely conventional energy and renewable energy. Conventional energy mainly includes municipal electricity and fossil fuels; renewable energy mainly includes solar energy, wind energy, biogas, ground source heat pumps, etc.

[0005] At present, in the process of facility agriculture production, there are several ways to use energy:

[0006] (1) Municipal electricity is mainly used to drive agricultural production machinery and production control systems, and is also used to convert into heat and cold to maintain the environmental requirements of facility agriculture, such as electric heating and electric refrigeration;

[0007] (2) Fossil fuels are mainly used for boiler heating, among which natural gas is also used for gas-fired distributed cooling, heating and power trigeneration: gas-fired distributed generator sets burn natural gas to generate electricity, provide electricity for facility agriculture, and at the same time recycle the waste heat and flue gas generated by power generation. The heat of the flue gas is used as the heat and cooling source of the greenhouse, and the CO2 in the flue gas is purified and used as plant gas fertilizer to promote plant growth;

[0008] (3) Solar energy is mainly used for solar photovoltaic power generation systems and solar water heating systems;

[0009] (4) Wind energy is mainly used for wind power generation and wind heating;

[0010] (5) Biogas is produced by microbial fermentation of agricultural waste and livestock, poultry and aquaculture excrement. It is mainly used for boiler heating and gas-fired distributed power generation: gas-fired distributed power generation units burn biogas to generate electricity and provide electricity for agricultural greenhouses. At the same time, the waste heat and flue gas generated by power generation are recycled and utilized. The heat of the flue gas is used as the heat and cooling source of the greenhouse. The CO2 in the flue gas is purified and used as plant gas fertilizer to promote plant growth. Biogas residue and biogas liquid are used as fertilizer to supply plant growth.

[0011] (6) Geothermal heat pumps consume electricity and use water to exchange heat with shallow geothermal resources (groundwater, soil or surface water) on the earth's surface as the heat source of the ground source heat pump. In summer, the ground is used for cooling, and in winter, the ground is used for heating.

[0012] Although the use of renewable energy in facility agriculture can not only reduce energy consumption, but also reduce the emission of CO2 and various pollutants, it is a green and environmentally friendly agricultural production method and the development direction of facility agriculture in the future. However, there are some problems in the current use of renewable energy in facility agriculture in my country:

[0013] (1) Solar energy: Due to the influence of geographical location, season, rainy days, night or special weather conditions, the energy production and supply of solar energy are intermittent and cannot be guaranteed to be continuous. In addition, due to the limitation of technical level, the conversion efficiency of solar photovoltaic power generation is low;

[0014] (2) Wind energy: The utilization of wind energy is severely restricted by geographical location, and it also has disadvantages such as intermittent and unstable wind power, low conversion efficiency, and large land occupation.

[0015] (3) Biogas: The production of biogas is greatly affected by temperature and raw materials; the sulfide in biogas will corrode equipment and needs to be desulfurized; the NOx released into the atmosphere after biogas combustion will seriously pollute the environment;

[0016] (4) Ground source heat pump: First, ground source heat pumps consume municipal electricity to drive air conditioning equipment, and the main source of municipal electricity is coal-fired power, so it will increase CO2 and pollutant emissions; second, the southern region mainly relies on cooling, mainly injecting heat into the ground; while the northern region has a large demand for heating in winter, mainly injecting cold energy into the ground. Therefore, after the system has been running for many years, it will cause underground temperature imbalance, reduce system efficiency, and affect the surrounding ecology; third, since it is necessary to dig wells underground, there must be enough area for digging wells and burying pipes; fourth, since it involves digging wells and installation, its construction cost is nearly 40% higher than that of conventional air conditioners; fifth, since the structure of ground source heat pumps is more complex, the requirements for design, construction, and construction site management are relatively high. Once the underground equipment fails, it cannot be repaired and can only be abandoned or the well is re-drilled;

[0017] (5) Single energy type and low security factor: Currently, the renewable energy used in facility agriculture is of a single type, and most of them only use one type of renewable energy, such as agricultural photovoltaic complementarity, biogas boilers, etc. Once problems arise with renewable energy, there is no backup energy source, and the supply of electricity, cooling, and heat to the agricultural greenhouse cannot be guaranteed. Summary of the invention

[0018] The present invention provides a multi-energy complementary recycling system for facility agriculture, which adopts a multi-energy complementary approach to combine municipal electricity, fossil energy, clean energy, renewable energy and circular economy. In the production process of facility agriculture, the operation of various energy supply modes is coordinated to match them with the energy demand of facility agriculture, so as to achieve the purpose of improving the energy security coefficient, reducing carbon dioxide emissions and environmental pollution, reducing energy costs, and realizing the comprehensive utilization of energy resources.

[0019] In order to achieve the above object, the present invention adopts the following technical solutions:

[0020] A multi-energy complementary recycling system for facility agriculture, characterized in that it mainly includes: a multi-energy complementary energy control system, wherein the power input end of the multi-energy complementary energy control system is respectively connected to a wind power generation system, a municipal power grid, a gas-fired distributed generator set and a solar power generation system; the power output end of the multi-energy complementary energy control system is connected to electricity for production and life; the gas supply end of the gas-fired distributed generator set is respectively connected to a gas pipeline / storage tank and a biogas desulfurization tower, and its power output end is connected to the multi-energy complementary energy control system; the flue gas outlet of the gas-fired distributed generator set is connected to a lithium bromide unit; the flue gas outlet of the lithium bromide unit is connected to a flue gas purification tower; the exhaust port of the flue gas purification tower and the outlet of the urea solution are respectively connected to the planting greenhouse; The circulating water inlet and outlet of the lithium bromide unit are respectively connected to the plate heat exchanger through a water circulation pipeline; the sleeve circulating water inlet and outlet of the plate heat exchanger are respectively connected to the temperature regulators of the planting greenhouse, the biogas tank, the livestock and poultry breeding and the aquaculture through a water circulation pipeline; the solar power generation system is arranged on the roof of the planting greenhouse; the delivery port of the planting greenhouse is respectively connected to the raw material inlet of the biogas tank, the feed inlet of the livestock and poultry breeding and the aquaculture; the manure outlets of the livestock and poultry breeding and the aquaculture are both connected to the biogas tank; the biogas outlet of the biogas tank is connected to the air inlet of the biogas desulfurization tower; the air outlet of the biogas desulfurization tower is connected to the air inlet of the gas-fired distributed generator set; the manure outlet of the biogas tank is connected to the fertilizer inlet of the planting greenhouse.

[0021] The application method of the multi-energy complementary recycling system for facility agriculture is characterized by intelligently and uniformly dispatching and supplying municipal electricity, fossil energy, clean energy and renewable energy, and combining planting greenhouses, biogas tanks, livestock and poultry farming and aquaculture in the production process of facility agriculture to coordinate operations to form a combination of resource recycling and multi-energy complementarity.

[0022] Specifically, the application method of a multi-energy complementary recycling system for facility agriculture described in the present invention adopts a multi-energy complementary energy control system to intelligently and uniformly dispatch electricity from a wind power generation system, a municipal power grid, a gas-fired distributed generator set and a solar power generation system to supply electricity for production and life; the gas-fired distributed generator set adopts municipal gas or biogas from a biogas digester to generate electricity; the flue gas waste heat of the gas-fired distributed generator set provides thermal energy for planting greenhouses, biogas digesters, livestock and poultry breeding and aquaculture; the solar power generation system is arranged on the roof of the planting greenhouse as a supplementary energy source for electricity; the planting greenhouse provides green fodder for the livestock and poultry breeding and the aquaculture, and the planting greenhouse, the livestock and poultry breeding and the aquaculture jointly provide biogas raw materials for the biogas digester; the biogas digester provides biogas for the gas-fired distributed generator set and at the same time provides fertilizer for the planting greenhouse.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] (1) The present invention centrally controls wind energy, solar energy, energy storage, biogas, gas-fired distributed power generation, municipal power grid and other energy sources, and intelligently dispatches them through a multi-energy complementary energy control system, so that various renewable energy sources and renewable energy and conventional energy can complement each other and make up for each other's shortcomings, so that they can serve as backup for each other, thereby improving the energy security coefficient; (2) By increasing the utilization ratio and efficiency of renewable energy, the municipal power consumption of facility agriculture is reduced; energy costs are saved, the economic efficiency of facility agriculture is improved; carbon dioxide emissions are reduced; and environmental pollution of facility agriculture is basically eliminated; (3) A carbon dioxide recovery and utilization system is set up, which can not only make full use of CO2 to increase crop yields, but also further reduce CO2 emissions from facility agriculture. At night, the device collects and stores CO2 in the waste heat flue gas of gas distribution and CO2 emitted by crop respiration; during the day, it is released into the planting greenhouse as gas fertilizer to increase crop yields; (4) Combining multi-energy complementarity with circular economy, the recycling of energy resources is realized, the conversion barrier between energy and resources is broken, and the purpose of comprehensive utilization of energy resources is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the multi-energy complementary recycling system of the present invention;

[0026] In the figure: 1- wind power generation system, 2- electricity for production and life, 3- multi-energy complementary energy control system, 4- energy storage battery, 5- municipal power grid, 6- gas distributed generator set, 7- gas pipeline / storage tank, 8- biogas desulfurization tower, 9- flue gas purification tower, 10- lithium bromide unit, 11- emergency cooling tower, 12- plate heat exchanger, 13- carbon dioxide recycling device, 14- planting greenhouse, 15- greenhouse roof solar power generation system, 16- biogas pool, 17- livestock and poultry breeding, 18- aquaculture. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0028] A multi-energy complementary recycling system for facility agriculture, mainly comprising: a multi-energy complementary energy control system 3, wherein the power input end of the multi-energy complementary energy control system 3 is respectively connected to a wind power generation system 1, a municipal power grid 5, a gas-fired distributed generator set 6 and a solar power generation system 15, so as to control and dispatch the power in a unified manner, and accept power from one or more of the above power sources simultaneously or separately according to actual needs; the power output end of the multi-energy complementary energy control system 3 is connected to production and living electricity 2, so as to provide electric energy for the production and living electricity 2;

[0029] Furthermore, the multi-energy complementary energy control system 3 is also connected to the energy storage battery 4, and is used to adjust the peak and trough of power through the energy storage and release of the energy storage battery 4;

[0030] The gas supply end of the gas-fired distributed generator set 6 is connected to the gas pipeline / storage tank 7 and the biogas desulfurization tower 8 respectively, and produces electric energy by burning the natural gas sent from the gas pipeline / storage tank 7 and / or the desulfurized biogas sent from the biogas desulfurization tower 8; its electric energy output end is connected to the multi-energy complementary energy control system 3;

[0031] The flue gas outlet of the gas-fired distributed generator set 6 is connected to the lithium bromide unit 10, and the high-temperature waste heat flue gas is used to drive the lithium bromide unit 10 to work and produce cold water or hot water;

[0032] The flue gas outlet of the lithium bromide unit 10 is connected to the flue gas purification tower 9, and the low-temperature waste heat flue gas that has released heat is supplied to the flue gas purification tower 9; the flue gas purification tower 9 removes flue gas particles from the low-temperature waste heat flue gas, and uses urea solution to remove NOx in the flue gas to produce nitrogen fertilizer;

[0033] The exhaust port of the flue gas purification tower 9 is connected to the planting greenhouse 14 with the urea solution outlet, and the clean carbon dioxide gas discharged is supplied to the plants in the greenhouse as gas fertilizer, and the urea solution is supplied to the plants in the greenhouse as nitrogen fertilizer;

[0034] Furthermore, a carbon dioxide recycling device 13 is provided between the flue gas purification tower 9 and the planting greenhouse 14, and is connected to the two by carbon dioxide circulation pipelines respectively, for adjusting the concentration of carbon dioxide in the planting greenhouse 14;

[0035] The circulating water inlet and outlet of the lithium bromide unit 10 are respectively connected to the plate heat exchanger 12 through a water circulation pipeline, and the residual energy is supplied to the plate heat exchanger 12 for heat exchange; the sleeve circulating water inlet and outlet of the plate heat exchanger 12 are respectively connected to the temperature regulators of the planting greenhouse 14, the biogas pool 16, the livestock and poultry breeding 17 and the aquaculture 18 through a water circulation pipeline, and the energy obtained by the residual heat exchange with the lithium bromide unit 10 is supplied to these end users through the circulating water;

[0036] The solar power generation system 15 is arranged on the roof of the planting greenhouse 14; the delivery port of the planting greenhouse 14 is respectively connected to the raw material inlet of the biogas pool 16, and the feed inlet of the livestock and poultry breeding 17 and the aquaculture 18, so as to provide green fodder for the livestock and poultry breeding 17 and the aquaculture 18, and provide agricultural planting waste as biogas raw materials for the biogas pool 16;

[0037] The manure outlets of the livestock and poultry breeding 17 and the aquaculture 18 are connected to the biogas tank 16, providing livestock and poultry breeding excrement and aquaculture excrement as biogas raw materials; the biogas outlet of the biogas tank 16 is connected to the air inlet of the biogas desulfurization tower 8, and iron oxide is used to remove sulfur from the flue gas; the air outlet of the biogas desulfurization tower 8 is connected to the air inlet of the gas-fired distributed generator set 6, and the desulfurized biogas is supplied to the gas-fired distributed generator set 6 for power generation;

[0038] The manure outlet of the biogas tank 16 is connected to the fertilizer inlet of the planting greenhouse 14 to provide biogas residual sludge as fertilizer for the planting greenhouse 14 .

[0039] Furthermore, the lithium bromide unit 10 is also connected to the emergency cooling tower 11 through the water outlet and the water inlet respectively. When the return water of the plate heat exchanger 12 cannot meet the needs of the lithium bromide unit 10, the emergency cooling tower 11 provides circulating heating and cooling of water.

[0040] Furthermore, the temperature regulator of the planting greenhouse 14 is a blower heat exchanger arranged inside; the temperature regulator of the biogas tank 16 is a winter heater arranged inside; the temperature regulator of the livestock and poultry breeding 17 is a blower heat exchanger arranged inside; and the temperature regulator of the aquaculture 18 is a water temperature controller arranged inside.

[0041] The multi-energy complementary recycling system for facility agriculture of the present invention has the following working principle:

[0042] The multi-energy complementary energy control system 3 uses the electricity produced by renewable energy and clean energy such as the wind power generation system 1, the gas-fired distributed generator set 6, and the greenhouse rooftop solar power generation system 15 through intelligent scheduling, and supplies it to the production / living electricity 2;

[0043] When the power demand of the production / living electricity 2 is lower than the power supply of renewable energy and clean energy, the excess power is input into the energy storage battery 4 by the multi-energy complementary energy control system 3 for storage; when the power demand of the production / living electricity 2 exceeds the power supply of renewable energy and clean energy, the difference is first called from the energy storage battery 4 by the multi-energy complementary energy control system 3; if the energy storage battery 4 is still insufficient after being fully discharged, the multi-energy complementary energy control system 3 calls from the municipal power grid 5;

[0044] The "gas-fired distributed generator set 6" generates electricity by burning natural gas / biogas, and the electricity is input into the "multi-energy complementary energy control system 3" for intelligent scheduling; the high-temperature waste heat flue gas is input into the "lithium bromide unit 10" to produce heat / cooling;

[0045] There are two sources of gas for the “gas-fired distributed generator set 6”: one is the desulfurized biogas produced by the “biogas pool 16” and desulfurized by the “biogas desulfurization tower 8”, and the other is the natural gas from the “gas pipeline / storage tank 2”; the “gas-fired distributed generator set 6” gives priority to the desulfurized biogas during operation, and when the desulfurized biogas is insufficient or fails, it is supplemented by natural gas;

[0046] The heat / cold produced by the "lithium bromide unit 10" is transported to the "planting greenhouse 14", "livestock and poultry breeding 17" and "aquaculture 18" through the "plate exchanger 12" to control the ambient temperature; in addition, in winter, it is also transported to the "biogas pool 16" for heat preservation and promotion of biogas production;

[0047] The high-temperature waste heat flue gas is converted into low-temperature waste heat flue gas after passing through the "lithium bromide unit 10" and is sent to the "flue gas purification tower 9" for denitrification; the "flue gas purification tower 9" uses urea as a denitrification agent to remove nitrogen oxides NOX in the flue gas, and the urea solution after denitrification is sent to the "planting greenhouse 14" as a fertilizer for the growth of crops;

[0048] The flue gas denitrated from the "flue gas purification tower 9" contains a large amount of clean CO2, so during the day, these flue gases are input into the "planting greenhouse 14" as gas fertilizer to promote the growth of crops; at night, these flue gases are input into the "carbon dioxide recycling device 13" for storage, and then released to the "planting greenhouse 14" during the day; in addition, at night, the "carbon dioxide recycling device 13" also collects and stores the CO2 released by the crops in the "planting greenhouse 14"; during the day, it is released into the "planting greenhouse 14";

[0049] The crops produced in the "planting greenhouse 14" are supplied as green fodder to the "livestock and poultry breeding 17" and "aquaculture 18" for livestock and poultry breeding and aquaculture;

[0050] The agricultural waste from the "planting greenhouse 14", the livestock and poultry excrement from the "livestock and poultry breeding 17", and the aquaculture excrement from the "aquaculture 18" are all input into the "biogas tank 16" for fermentation to produce biogas;

[0051] The biogas produced by the "biogas pool 16" first enters the "biogas desulfurization tower 8", where it is desulfurized by iron oxide and then sent to the gas-fired distributed generator set for power generation. The biogas residues such as sludge and biogas liquid remaining after biogas production are sent to the "planting greenhouse 14" as fertilizer to promote the growth of crops.

Claims

1. A multi-energy complementary recycling system for facility agriculture, It is characterized in that Mainly include: A multi-energy complementary energy control system (3), wherein the power input end of the multi-energy complementary energy control system (3) is respectively connected to a wind power generation system (1), a municipal power grid (5), a gas-fired distributed generator set (6) and a solar power generation system (15); the power output end of the multi-energy complementary energy control system (3) is connected to production and living electricity (2); the gas supply end of the gas-fired distributed generator set (6) is respectively connected to a gas pipeline / storage tank (7) and a biogas desulfurization tower (8), and the power output end thereof is connected to the multi-energy complementary energy control system (3); the flue gas outlet of the gas-fired distributed generator set (6) is connected to a lithium bromide unit (10); the flue gas outlet of the lithium bromide unit (10) is connected to a flue gas purification tower (9); the exhaust port and the urea solution outlet of the flue gas purification tower (9) are respectively connected to a planting greenhouse (14); the circulating water inlet and outlet of the lithium bromide unit (10) are respectively connected to a plate-type The heat exchanger (12) is connected; the jacketed circulating water inlet and outlet of the plate heat exchanger (12) are respectively connected to the temperature regulators of the planting greenhouse (14), the biogas tank (16), the livestock and poultry breeding (17) and the aquaculture (18) through water circulation pipelines; the solar power generation system (15) is arranged on the roof of the planting greenhouse (14); the delivery port of the planting greenhouse (14) is respectively connected to the raw material inlet of the biogas tank (16), the livestock and poultry breeding (17) and the aquaculture (18). The feed inlet of the aquaculture (18) is connected; the manure outlets of the livestock and poultry breeding (17) and the aquaculture (18) are both connected to the biogas tank (16); the biogas outlet of the biogas tank (16) is connected to the air inlet of the biogas desulfurization tower (8); the air outlet of the biogas desulfurization tower (8) is connected to the air inlet of the gas-fired distributed generator set (6); the manure outlet of the biogas tank (16) is connected to the fertilizer inlet of the planting greenhouse (14); By adopting the application method of the multi-energy complementary recycling system for facility agriculture, municipal electricity, fossil energy, clean energy and renewable energy are intelligently and uniformly dispatched and supplied. In the production process of facility agriculture, greenhouses, biogas pools, livestock and poultry breeding and aquaculture are combined to coordinate operations to form a combination of resource recycling and multi-energy complementarity. The multi-energy complementary energy control system intelligently and uniformly dispatches the electricity from the wind power generation system, the municipal power grid, the gas-fired distributed generator set and the solar power generation system to supply electricity for production and life; the gas-fired distributed generator set uses municipal gas or biogas from the biogas digester to generate electricity; the flue gas waste heat of the gas-fired distributed generator set provides thermal energy for the planting greenhouse, the biogas digester, livestock and poultry breeding and aquaculture; the solar power generation system is arranged on the roof of the planting greenhouse; the planting greenhouse provides green fodder for the livestock and poultry breeding and the aquaculture, and the planting greenhouse, the livestock and poultry breeding and the aquaculture jointly provide biogas raw materials for the biogas digester; the biogas digester provides biogas for the gas-fired distributed generator set and fertilizer for the planting greenhouse at the same time.

2. The multi-energy complementary recycling system according to claim 1, It is characterized in that The multi-energy complementary energy control system (3) is also connected to an energy storage battery (4).

3. The multi-energy complementary recycling system according to claim 1, It is characterized in that A carbon dioxide recycling device (13) is also provided between the flue gas purification tower (9) and the planting greenhouse (14), and is connected to the two via carbon dioxide circulation pipelines.

4. The multi-energy complementary recycling system according to claim 1, It is characterized in that The lithium bromide unit (10) is also connected to the emergency cooling tower (11) via a water outlet and a water inlet.

5. The multi-energy complementary recycling system according to claim 1, It is characterized in that The temperature regulator of the planting greenhouse (14) is a blast-type heat exchanger arranged inside; the temperature regulator of the biogas tank (16) is a winter heater arranged inside; the temperature regulator of the livestock and poultry breeding (17) is a blast-type heat exchanger arranged inside; and the temperature regulator of the aquaculture (18) is a water temperature controller arranged inside.

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