A multi-energy complementary pig house carbon neutral energy environment creating system

Abstract

The present application relates to air conditioning and refrigeration technology field, especially to a kind of multi-energy complementary pig house carbon neutralization energy environment creation system, including air conditioning unit, ventilation unit and solar photovoltaic photo-thermal unit.Air conditioning unit includes absorption refrigeration unit, circulating water pump, capillary radiation tube, biogas and natural gas interface and cooling tower.Ventilation unit includes fan, sensible heat exchanger, air filter device, solution dehumidification and regeneration device, evaporative cooling device, air supply device.Absorption refrigeration unit provides cold and heat for pig house of pig farm, and circulating water pump sends chilled water to each pig house, and chilled water enters capillary radiation tube to adjust air temperature in pig house by radiation heat transfer.The electric energy used by water pump and fan in air conditioning unit and ventilation unit in system is provided by solar photovoltaic power generation, and the heat used for solution recovery in solution dehumidification device is provided by solar photo-thermal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning and refrigeration technology, and particularly relates to a multi-energy complementary pig house carbon neutral energy environment creating system. BACKGROUND

[0002] In the main greenhouse gas emission industries, the livestock industry accounts for a large share, livestock in the breeding process will emit a large amount of heat and greenhouse gases, and its excrement without treatment will cause serious environmental pollution.

[0003] The current farm air conditioning is generally achieved by using air source heat pump or ground source heat pump to realize refrigeration and heating, and the obtained cold quantity is partly used for farm temperature regulation and partly used for air drying. Although the refrigeration coefficient of the heat pump, especially the ground source heat pump, is relatively high, the consumed is still high-grade electric energy, and the electric energy in China is mainly from thermal power generation. At the same time, the biogas produced in the biogas pool also cannot be fully utilized. According to the literature estimation, 1 cubic meter of biogas is equivalent to 3.89 yuan / m³ of electricity generated by the same energy, which shows that the value waste is very huge. Nowadays, some farms use biogas power generation and grid connection to utilize biogas, but there are problems of technology, investment and benefit, and it cannot be well realized.

[0004] The present application combines the biogas engineering in the livestock industry, uses the biogas produced by the fermentation of livestock manure to provide heat and refrigeration for the farm through the absorption refrigeration unit, simultaneously uses the large area roof of the farm to arrange the solar photovoltaic and photo-thermal plate to provide electric energy for the water pump and fan in the system, and the heat energy is used for the recovery of the solution in the solution dehumidification. The biogas engineering generally sets the gas storage tank, and the system can also be externally connected with natural gas, so that the abnormal weather to a certain extent can be overcome. Since the farms are generally distributed in the suburbs, the surrounding vegetation is rich, and the produced carbon dioxide will be absorbed by the plants, and will not cause great burden to the environment. SUMMARY

[0005] The present application aims at overcoming the deficiencies of the prior art, and provides a multi-energy complementary pig house carbon neutral energy environment creating system to solve the problems of insufficient utilization of biogas, non-environmental protection of the system, non-economy of the system and the like.

[0006] In order to achieve the purpose of the present application, the technical scheme adopted by the present application is as follows:

[0007] The present application discloses a multi-energy complementary pig house carbon neutral energy environment creating system, which comprises an air conditioning unit, a ventilation unit and a solar photovoltaic and photo-thermal unit,

[0008] The air conditioning unit comprises an absorption refrigeration unit, a cooling tower and a capillary radiation pipe, one end of the absorption refrigeration unit is provided with a biogas and natural gas interface, the other end is provided with a cooling water outlet at the top, the cooling water outlet is communicated with the inlet of the cooling tower, and a first solution valve and a seventh circulating water pump are arranged between the cooling water outlet and the inlet of the cooling tower; the outlet of the cooling tower is communicated with the cooling water inlet of the absorption refrigeration unit; the chilled water outlet of the absorption refrigeration unit is connected with the inlet of the capillary radiation pipe through a first circulating water valve, and the outlet of the capillary radiation pipe is connected with the chilled water inlet of the absorption refrigeration unit through a second solution valve; the ventilation unit comprises a fourth sensible heat exchanger, the inlet of the fourth sensible heat exchanger is connected with a fresh air duct, the outlet thereof passes through an air passage under the surface of a solar photovoltaic panel, a sixth sensible heat exchanger, an air filter and a solution dehumidification device in sequence, the outlet of the solution dehumidification device is connected with the air inlet of an evaporative cooling device through a first fan, and the outlet of the evaporative cooling device is connected with the air supply end in the pig house; the outlet of the solution in the bottom pool of the solution dehumidification device is connected with the inlet of the solution in the bottom pool of a solution regeneration device in sequence through a fifth solution pump, a fifth solution valve and a second sensible heat exchanger, the outlet of the solution in the bottom pool of the solution regeneration device is connected with the nozzle in sequence through a third solution pump, a fourth solution valve and a first sensible heat exchanger, and the regenerated solution outlet of the solution in the bottom pool is connected with the nozzle in sequence through a second sensible heat exchanger, a third sensible heat exchanger and a sixth solution valve; the outlet of the water in the bottom pool of the evaporative cooling device is connected with the nozzle in sequence through a sixth circulating water pump, a branch pipe inlet, a fifth sensible heat exchanger and a branch pipe convergence, the branch pipe inlet passes through the air inlet, the branch pipe outlet converges, and the low-temperature cold water outlet of the fifth sensible heat exchanger is connected with the high-temperature cold water inlet of the fifth sensible heat exchanger in sequence through a third sensible heat exchanger, a fourth circulating water pump and a seventh valve; the air pipe of the air exhaust port of the pig house is connected with the outdoor environment in sequence through a fan, a return air pipe inlet and a fourth sensible heat exchanger, the return air pipe inlet is connected with the fresh air duct in sequence through a check valve and a butterfly valve; the solar photovoltaic light and heat unit comprises a solar photovoltaic panel, the current output end of the solar photovoltaic panel is connected with a power storage element and a heat storage element respectively, the air passage wind pipe under the surface of the solar photovoltaic panel is connected with the air pipe inlet, connected with the fresh air duct in sequence through an air valve and an air pipe outlet, the hot water outlet of the solar heat collector is connected with the inlet of the heat storage element through a three-way plug valve, and the other is connected with the heat storage element through a sixth sensible heat exchanger, and the outlet of the heat storage element is connected with the water inlet of the solar heat collector through a first sensible heat exchanger and a second circulating water pump.

[0009] The solar photovoltaic panel comprises photovoltaic glass, photovoltaic cells, back plates, air passages and thermal insulation layers arranged in sequence from top to bottom.

[0010] The rotating speed of the water pump is controlled by the control system, and the equipment operation is controlled through feedback adjustment.

[0011] The absorption refrigeration unit mainly cools and heats through burning biogas, and when the biogas cannot supply the required cooling or heating of the pig house, natural gas can be connected to assist.

[0012] The capillary radiation tube is filled with cold water or hot water to provide cooling and heating for the indoor space through radiation, and can be installed in the floor or under the ground cover layer, and the floor or ground cover layer should meet the design requirements of radiant heating.

[0013] The solution recovery process in the solution dehumidification device is equipped with an auxiliary heat source, which is activated when the solar photovoltaic photothermal unit provides insufficient heat.

[0014] When solar photovoltaic power generation cannot fully supply, part of the equipment uses the electric energy generated by solar photovoltaic power generation, and the remaining equipment is connected to the public power grid.

[0015] The beneficial effects of the present application are:

[0016] The present application utilizes the absorption refrigeration unit to adjust the temperature of the pig house, and makes full use of the biogas generated by the biogas system, which not only reduces the investment cost of the farmer in the temperature adjustment of the breeding farm, but also timely consumes the biogas, and the carbon dioxide generated in the process can also be absorbed by the surrounding vegetation. The present application makes full use of solar energy, and uses solar power for water pump and fan operation, which reduces the electricity consumption and is more green and environmentally friendly. Renewable energy is used to replace non-renewable energy, and the light and heat brought by solar energy is used for solution recovery in the solution dehumidification device, which greatly reduces the demand for electric energy during recovery. The present application introduces a control system, which controls the operation of the equipment through the control system, maintains the environmental parameters within the required range, and saves energy consumption as much as possible. The present application changes the method of refrigeration and dehumidification, replaces the traditional cooling and dehumidification with solution dehumidification, reduces the consumption of cold energy, and after cooling and dehumidification, it is often necessary to add humidity to adjust to the appropriate supply air humidity, which is equivalent to wasting a large part of the cold energy during the process. Solution dehumidification can be used without consuming cold energy. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 System diagram for multi-energy complementary pig house carbon neutral energy environment creation system;

[0018] Fig. 2 Large-scale diagram for double-effect direct-fired absorption refrigeration unit;

[0019] Fig. 3 Large-scale diagram for solar photovoltaic panel.

[0020] In the figure: absorption refrigeration unit 1, cooling tower 2, capillary radiation tube 3, solar photovoltaic panel 4, solar collector 5, power storage element 6, heat storage element 7, first sensible heat exchanger 81, second sensible heat exchanger 82, third sensible heat exchanger 83, fourth sensible heat exchanger 84, fifth sensible heat exchanger 85, sixth sensible heat exchanger 86, air filter 9, solution drying device 10, solution regeneration device 11, first fan 121, second fan 122, third fan 123, evaporative cooling device 13, first circulating water pump P1, second circulating water pump P2, third solution pump P3, fourth circulating water pump P4, fifth solution pump P5, sixth circulating water pump P6, seventh circulating water pump P7, first valve V1, second valve V2, three-way plug valve V3, fourth solution valve V4, fifth solution valve V5, sixth solution valve V6, seventh valve V7, air valve D1, check valve D2, butterfly valve D3. DETAILED DESCRIPTION

[0021] The application will be further described below in conjunction with the drawings and examples:

[0022] Reference Figs. 1-3 .

[0023] The application discloses a multi-energy complementary pig house carbon neutral energy environment creating system, which comprises an air conditioning unit, a ventilation unit and a solar photovoltaic and photo-thermal unit,

[0024] Refrigeration operating condition

[0025] The air conditioning unit comprises an absorption refrigeration unit 1, a cooling tower 2 and a capillary radiation pipe 3, biogas is introduced into the absorption refrigeration cycle unit 1 through a biogas and natural gas interface 101, the cooling water outlet 102 of the absorption refrigeration cycle unit 1 is connected with the inlet of the cooling tower 2 in sequence through a first solution valve V1 and a seventh circulating water pump P7, the outlet of the cooling tower 2 is communicated with the cooling water inlet 103 of the absorption refrigeration unit 1, the chilled water outlet 104 of the absorption refrigeration unit 1 is connected with the inlet of the capillary radiation pipe 3 through a first circulating water valve P1, the outlet of the capillary radiation pipe 3 is connected with the chilled water inlet 105 of the absorption refrigeration unit 1 through a second solution valve V2, the adjusting damper D1 in the ventilation unit is connected with the outdoor, the fresh air duct is connected with the inlet of the air filter 9 through the fourth sensible heat exchanger 84, the outlet of the return air duct and the sixth sensible heat exchanger 86, the outlet of the air filter 9 is connected with the air inlet of the solution dehumidification device 10, the air outlet of the solution dehumidification device 10 is connected with the air inlet of the evaporative cooler 13 through the first fan 121, and the air outlet of the evaporative cooler 13 is connected with the indoor air supply device. The outlet of the solution dehumidification device 10 is connected with the inlet of the solution regeneration device 11 in sequence through the fifth solution pump P5, the fifth solution valve V5 and the second sensible heat exchanger 82, the outlet of the solution regeneration device 11 is connected with the inlet of the nozzle in sequence through the third solution pump P3, the fourth solution valve V4 and the first sensible heat exchanger 81, and the outlet of the solution regeneration device 11 is connected with the nozzle in sequence through the second sensible heat exchanger 82, the third sensible heat exchanger 83 and the sixth solution valve V6. The outlet of the evaporative cooler 13 is connected with the nozzle in sequence through the sixth circulating water pump P6, the branch inlet, the fifth sensible heat exchanger 85 and the branch confluence, the branch inlet passes through the air inlet, the branch outlet is confluenced, the low-temperature cold water outlet of the fifth sensible heat exchanger 85 is connected with the high-temperature cold water inlet of the fifth sensible heat exchanger 85 in sequence through the third sensible heat exchanger 83, the fourth circulating water pump P4 and the seventh valve V7, the air duct of the pig house exhaust port is connected with the outdoor environment in sequence through the fan 122, the return air duct inlet and the fourth sensible heat exchanger 84, the return air duct inlet is connected with the fresh air duct in sequence through the check valve D2 and the butterfly valve D3. The solar photovoltaic panel 4 comprises photovoltaic glass 41, photovoltaic cells 42, back plates 43, air channels 44 and thermal insulation layers 45 arranged from top to bottom in sequence, the current output ends of the solar photovoltaic panel 4 are connected with the power storage element 6 and the heat storage element 7 respectively, the air channel air duct below the surface of the solar photovoltaic panel 4 is connected with the air duct inlet, connected with the fresh air duct in sequence through the air valve D1 and the air duct outlet, the hot water outlet of the solar heat collector 5 is connected with the inlet of the heat storage element 7 through the three-way plug valve V3, connected with the heat storage element 7 through the sixth sensible heat exchanger 86, and the outlet of the heat storage element 7 is connected with the water inlet of the solar heat collector 5 through the first sensible heat exchanger 81 and the second circulating water pump P2.

[0026] The working principle of the refrigeration operation condition: the heat generated by the biogas combustion can be absorbed by the generator of the absorption refrigeration unit, and after heat release in the condenser, it will absorb heat in the evaporator to produce chilled water to be sent into the pig house for refrigeration. The fresh air is pretreated by the sensible heat exchanger, mixed with the return air, passed through the air filter to improve the air quality, and passed through the solution dehumidification device to reduce the moisture content in the air. Thus, when passing through the evaporative cooling device, the air with lower temperature and humidity can be sent into the pig house to achieve the purpose of air exchange and removal of excess humidity. The solution dehumidification device, after absorbing water, becomes less concentrated and is transported to the solution regeneration device, where the water is evaporated by heating, increasing the concentration of the solution and maintaining the continuous operation of the solution dehumidification device. The electricity generated by the solar photovoltaic panel is used for fan and pump equipment, and can also be used for solution dehumidification when the light and heat are insufficient. The excess electricity is stored and can be discharged when the photovoltaic power generation is insufficient. The heat collected by the solar collector is used for solution dehumidification.

[0027] Heating operation condition

[0028] The absorption refrigeration unit in the air conditioning unit operates in heating condition, biogas is introduced into the absorption refrigeration cycle unit 1, the hot water outlet of the absorption refrigeration cycle unit 1 is connected to the inlet of the capillary radiation pipe 3 through the first circulating water pump P1, and the outlet of the capillary radiation pipe 3 is connected to the hot water inlet of the absorption refrigeration unit 1 through the second valve V2. The adjusting valve D1 in the ventilation unit is connected to the fresh air duct, the solution dehumidification device 10, the solution regeneration device 11 and the evaporative cooling device 13 are closed, the sixth sensible heat exchanger 86 is connected through the three-way stop valve V3, the fresh air duct is connected to the inlet of the air filter 9 through the fourth sensible heat exchanger 84 and the sixth sensible heat exchanger 86, the outlet of the air filter 9 is connected to the inlet of the solution dehumidification device 10, the outlet of the solution dehumidification device 10 is connected to the inlet of the evaporative cooler 13 through the first fan 121, and the outlet of the evaporative cooler 13 is connected to the indoor air supply device. The exhaust air duct passes through the second fan 122, the return air duct inlet and the fourth sensible heat exchanger 84 in turn and is connected to the outside, wherein the return air duct inlet passes through the check valve D-, the butterfly valve D3 and the return air duct outlet in turn and is connected to the fresh air duct. The solar photovoltaic panel 4 is connected to the electricity storage element 6, the heat storage element 7 and all fans and pumps through wires, the outlet of the solar collector 5 is connected to the sixth sensible heat exchanger 86 through the three-way stop valve V3, and then connected to the inlet of the heat storage element 7, and the outlet of the heat storage element 7 is connected to the inlet of the solar collector 5 through the first sensible heat exchanger 81 and the second circulating water pump P2 in turn.

[0029] The working principle of the heating operation condition is that the heat generated by the biogas combustion can be absorbed by the circulating water, and the high-temperature hot water is sent into the pig house for radiation heating. The fresh air is pretreated by the sensible heat exchanger, mixed with the return air, and then passes through the air filter to improve the air quality. At the same time, due to the low moisture content of the outdoor fresh air, the purpose of ventilation and removal of excess moisture can be achieved. The electricity generated by the solar photovoltaic panel is used for the fan, water pump and other equipment, and the excess electricity is stored. When the photovoltaic power generation is insufficient, the storage element can be discharged.

[0030] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings is also included in the patent protection scope of the present application.

Claims

1. A multi-energy complementary carbon-neutral energy environment creation system for pigsties, characterized in that: Includes air conditioning units, ventilation units, and solar photovoltaic and solar thermal units. The air conditioning unit includes an absorption chiller (1), a cooling tower (2), and a capillary radiant tube (3). The absorption chiller (1) has a biogas and natural gas interface (101) at one end and a cooling water outlet (102) at the top of the other end. The cooling water outlet (102) is connected to the inlet of the cooling tower (2), and a first solution valve (V1) and a seventh circulating water pump (P7) are provided between them. The outlet of the cooling tower (2) is connected to the cooling water inlet (103) of the absorption chiller (1). The chilled water outlet (104) of the absorption chiller (1) is connected to the inlet of the capillary radiant tube (3) through the first circulating water valve (P1), and the outlet of the capillary radiant tube (3) is connected to the chilled water inlet (105) of the absorption chiller (1) through the second solution valve (V2). The ventilation unit includes a fourth sensible heat exchanger (84). The inlet of the fourth sensible heat exchanger (84) is connected to the fresh air duct. Its outlet passes sequentially through the air channel duct outlet under the surface of the solar photovoltaic panel (4), the sixth sensible heat exchanger (86), the air filter (9), and the solution dehumidification device (10). The outlet of the solution dehumidification device (10) is connected to the air inlet of the evaporative cooling device (13) via the first fan (121). The outlet of the evaporative cooling device (13) is connected to the air supply terminal in the pig house. The solution outlet of the bottom pool of the solution dehumidification device (10) passes sequentially through the fifth solution pump (P5), the fifth solution valve (V5), and the second sensible heat exchanger (82) to the solution inlet of the bottom pool of the solution regeneration device (11). The solution outlet of the bottom pool of the solution regeneration device (11) passes sequentially through the third solution pump (P3), the fourth solution valve (V4), and the first sensible heat exchanger. (81) The solution outlet of the solution bottom pool regeneration solution enters the nozzle through the second sensible heat exchanger (82), the third sensible heat exchanger (83), and the sixth solution valve (V6) in sequence; the water outlet of the bottom pool of the evaporative cooling device (13) enters the nozzle through the sixth circulating water pump (P6), the branch pipe inlet, the fifth sensible heat exchanger (85) and the branch pipe in sequence. The branch pipe inlet passes through the air inlet and converges at the branch pipe outlet. The low-temperature cold water outlet of the fifth sensible heat exchanger (85) enters the high-temperature cold water inlet of the fifth sensible heat exchanger (85) through the third sensible heat exchanger (83), the fourth circulating water pump (P4) and the seventh valve (V7) in sequence; the duct of the pig house exhaust vent enters the outdoor environment through the fan (122), the return air duct inlet and the fourth sensible heat exchanger (84) in sequence. The return air duct inlet enters the fresh air duct through the check valve (D2) and the butterfly valve (D3) in sequence. The solar photovoltaic thermal unit includes a solar photovoltaic panel (4). The current output terminal of the solar photovoltaic panel (4) is connected to the energy storage element (6) and the heat storage element (7) respectively. The air channel duct under the surface of the solar photovoltaic panel (4) is connected to the duct inlet and then connected to the fresh air duct through the air valve (D1) and the duct outlet in sequence. The hot water outlet of the solar collector (5) is connected to the inlet of the heat storage element (7) through the three-way stop valve (V3). Another item is connected to the heat storage element (7) through the sixth sensible heat exchanger (86). The outlet of the heat storage element (7) is connected to the water inlet of the solar collector (5) through the second circulating water pump (P2) after passing through the first sensible heat exchanger (81).

2. The multi-energy complementary carbon-neutral energy environment creation system for pigsties according to claim 1, characterized in that: In the cooling operation mode, the double-effect direct-fired absorption chiller (1) operates in the cooling mode and delivers cold energy to the pig house. The hot air in the air channel of the solar photovoltaic panel (4) is discharged to the outside. The heat collected by the solar collector (5) is used for the solution regeneration process of the solution dehumidification device. In the heating operation mode, the double-effect direct-fired absorption chiller (1) operates in the heating mode and delivers heat to the pig house. The hot air in the air channel of the solar photovoltaic panel (4) is mixed and enters the fresh air duct. The heat collected by the solar collector (5) is used for fresh air preheating. The solution dehumidification device (10), solution regeneration device (11) and evaporative cooling device (13) are closed.

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