Three-dimensional matrix type intelligent warehousing system based on ground source heat pump

Abstract

The invention relates to the technical field of grain storage, and discloses a three-dimensional matrix type intelligent warehousing system based on a ground source heat pump, which comprises a sealed granary, a temperature regulation and control system, a nitrogen humidity balance regulation and control system, an energy supply system and an intelligent control center. The sealed granary is provided with a bottom heightening layer which is divided into a storage space and an equipment space, the matrix type steel net pipe frame is arranged in the storage space in a three-dimensional mode, and the equipment space is provided with a water outlet and an electric exhaust port. The temperature regulation and control system comprises a U-shaped ground coupling pipe, a heat pump main machine, a temperature control water tank and a water pipe set. The nitrogen humidity balance regulation and control system comprises an air compressor, a drying machine, a nitrogen making machine, a humidifier and an air pipe group; solar energy and wind energy are adopted for energy supply, and energy consumption is greatly reduced; the intelligent control center is linked with the temperature regulation and control system and the nitrogen humidity balance regulation and control system through a distributed sensor, the temperature, humidity and oxygen concentration in the granary are regulated and controlled in a three-dimensional mode, the problems that traditional grain storage is high in energy consumption, uneven in temperature control and mildew and insects are effectively solved, and the quality guarantee period of grains is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The present application focuses on the technical field of grain storage, and particularly relates to a three-dimensional matrix type intelligent warehouse system based on a ground source heat pump. BACKGROUND

[0002] In the modern grain storage system, the internal environment of the granary, as the core grain storage facility, plays a decisive role in the quality and long-term storage safety of the grain. Generally speaking, the ideal temperature range for grain storage is 10-15℃. Within this temperature range, the respiration of the grain itself and the activities of microorganisms and pests can be effectively inhibited. It is appropriate to maintain the relative humidity at 55%-65%, so as to avoid mold due to excessive humidity or excessive water loss due to low humidity, which will affect the quality of the grain. Controlling the oxygen concentration at 2%-4% can greatly slow down the oxidation and respiration rate of the grain, effectively extending the storage period of the grain.

[0003] However, the current grain storage process generally faces the problem of uncontrolled local temperature and humidity, which is mainly caused by factors such as microbial metabolic activity, pest breeding, and grain respiration. If the abnormal temperature and humidity cannot be timely regulated, the grain is prone to mold, nutrient loss, and even large-scale quality change, resulting in serious economic losses.

[0004] Currently, the temperature control technology for granaries mainly includes natural ventilation, mechanical ventilation, and traditional air conditioning cooling. However, these technologies have many obvious defects: high energy consumption, difficulty in accurately controlling the temperature within the optimal range for grain storage, difficulty in coordinated regulation of temperature, humidity, and oxygen, etc. Currently, ground source heat pumps are maturely applied in the field of building energy saving, but there is no customized regulation system for grain storage in granaries. The present application provides a new idea for the method of grain storage in granaries through the innovation of pipe layout and the linkage of multiple systems. SUMMARY

[0005] The present application aims to overcome the problems of high energy consumption, insufficient temperature control accuracy, inability to coordinate the regulation of temperature and humidity, and difficulty in controlling oxygen concentration in the existing granary temperature control technology. By constructing an intelligent temperature and humidity regulation mechanism and combining precise control of oxygen concentration, a three-dimensional matrix type intelligent warehouse system based on a ground source heat pump is provided to improve the quality of grain storage and reduce energy consumption and economic losses.

[0006] To achieve the above purpose, the present application adopts the following technical scheme: a three-dimensional matrix type intelligent warehouse system based on a ground source heat pump, comprising a sealed granary, a temperature regulation system, a nitrogen and humidity balance regulation system, an energy supply system, and an intelligent control center.

[0007] Preferably, the sealed granary is completely isolated from the outside world, which can effectively prevent the outside environment from interfering with the temperature and humidity and oxygen concentration inside the granary. The outer wall of the granary is attached with heat insulation material to reduce heat transfer and maintain the temperature stability inside the granary. The bottom of the granary is provided with a raised layer to separate the storage space from the bottom and create space for the pipe group arrangement, while avoiding direct contact of the grain with the ground to prevent moisture, and the bottom of the equipment space is slightly inclined to facilitate the drainage of condensed water through the drain.

[0008] Preferably, the temperature control system includes a heat pump host, a U-shaped ground coupled pipe, and a temperature controlled water tank. The working principle is that the refrigerant circulates in the system, and through a series of processes such as compression by the compressor of the heat pump host and throttling by the expansion valve, the U-shaped ground coupled pipe exchanges heat with the soil to control the temperature of the circulating liquid in the temperature controlled water tank. After the water pipe group enters the storage space of the granary, it is divided into multiple vertical branches and extends to the equipment space, and then returns to the temperature controlled water tank. When the temperature in the granary is high, the temperature control system can transfer the heat in the granary to the ground, thereby achieving the purpose of cooling. When the temperature in the granary is low, the opposite is true.

[0009] Preferably, the nitrogen humidity balance control system includes an air compressor, a dryer, a nitrogen generator, and a humidifier. The air compressor operates to inhale natural air into the air tank for buffering and storage, and then removes moisture through the dryer to maintain a dry state before entering the nitrogen generator. The nitrogen generator uses internal molecular sieves to select dry high-concentration nitrogen gas from the air based on the difference in adsorption force of different gases in the air, and discharges other air. By adjusting the inlet air pressure and the residence time of the gas in the nitrogen generator, the residual oxygen content in the high-concentration nitrogen gas can be controlled. The dry high-concentration nitrogen gas then enters the humidifier, and the humidified and high-concentration nitrogen gas is discharged through the branch pipes of the air pipe group, and then seeps out through the fine pores of the pipe wall. The gas finally returns to the nitrogen humidity balance control system through the exhaust port, completing the air circulation.

[0010] Preferably, the energy supply system uses solar panels and wind turbines to collect solar and wind energy and convert them into electrical energy for storage, providing power for system control and achieving green energy supply.

[0011] Preferably, the intelligent control center collects environmental parameters in each area of the granary through a distributed sensor network, and dynamically adjusts the branch flow of the water pipe group, the gas flow rate of the air pipe group, and the opening degree of the electric exhaust port in conjunction with the temperature control system and the nitrogen humidity balance control system, achieving three-dimensional uniform control.

[0012] Advantages

[0013] The ground source heat pump type granary constant temperature and humidity system provided by the present application has the following advantages:

[0014] The three-dimensional matrix type intelligent storage system based on ground source heat pump significantly improves the energy utilization efficiency by constructing a green system of multi-energy collaborative energy supply. The temperature regulation system fully utilizes the underground shallow geothermal resources for heat exchange, which greatly reduces energy consumption in the refrigeration and heating processes by utilizing the stable temperature characteristics of the underground. At the same time, the solar panels and wind turbines work together to efficiently convert solar and wind energy into electricity, providing stable power supply for the system control. The collaborative operation of the ground source heat pump and the energy supply system successfully reduces the dependence on traditional energy, not only effectively solving the long-standing problem of high energy consumption in the field of agricultural storage, but also significantly improving the energy utilization efficiency, reducing the operating cost, and truly realizing green and efficient energy supply.

[0015] The three-dimensional matrix type intelligent storage system based on ground source heat pump efficiently creates a low-oxygen and humidity suitable environment through the unique design of the nitrogen humidity balance regulation system. In a low-oxygen environment, the respiration of grains and the breeding of pests are effectively inhibited, and the suitable humidity conditions greatly reduce the possibility of grain mold. This non-chemical method of preventing and treating insect and mold damage avoids the problems of pesticide residues caused by the use of chemical pesticides, which is green, efficient, and greatly guarantees the storage quality of grains and reduces economic losses caused by mold and pests.

[0016] The three-dimensional matrix type intelligent storage system based on ground source heat pump precisely regulates the environment in the granary in three dimensions, and the pipe groups are carefully and uniformly arranged in the granary, closely combined with the temperature regulation system, the nitrogen humidity balance regulation system, and the intelligent control center. The water pipe group can accurately take away the heat of the grains, and the air pipe group can effectively regulate the humidity and oxygen concentration. This whole system works together to basically cover the precise regulation of temperature and humidity in all positions of the granary, achieving the effect of three-dimensional dynamic uniform regulation. Even for a larger granary, it can ensure that the grains in every position are in the best storage environment, avoiding the damage caused by uncontrolled local temperature and humidity, and effectively guaranteeing the safety and stability of grain storage.

[0017] The three-dimensional matrix type intelligent storage system based on ground source heat pump is equipped with intelligent sensors in the intelligent control center, which can accurately sense the changes of multiple key indicators such as temperature, humidity, and oxygen concentration in the granary in real time, and quickly feed these data back to the control system. The control system automatically and accurately adjusts the operating state of devices such as the temperature regulation system and the nitrogen humidity balance regulation system according to the feedback data, realizing intelligent adjustment of the granary environment. This process greatly reduces manual intervention, significantly improves the reliability and stability of the system, and can timely and flexibly respond to sudden changes in the granary environment, continuously ensuring that the storage quality of grains meets high standard requirements. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description.

[0019] Figure 1 For the schematic diagram of the three-dimensional matrix intelligent warehouse system based on the ground source heat pump of the present application

[0020] Figure 2 For the schematic diagram of the internal structure of the granary of the present application

[0021] Figure 3 For the schematic diagram of the nitrogen humidity balance regulation system structure of the present application

[0022] Figure 4 For the operation flow chart of the nitrogen humidity balance regulation system of the present application

[0023] Figure 5 For the system control logic diagram of the present application

[0024] Legend:

[0025] Sealed granary 1, polyurethane insulation layer 11, heightening layer 12, electric exhaust port 13, storage space 14, drainage port 15, steel mesh pipe rack 16, clip 161, temperature regulation system 2, heat pump host 21, U-shaped ground coupling pipe 22, temperature control water tank 23, water pipe group 24, water inlet 25, water outlet 26, nitrogen humidity balance regulation system 3, air compressor 31, gas storage tank 32, dryer 33, nitrogen generator 34, humidifier 35, gas pipe group 36, air inlet 37, air compressor to gas storage tank pipe 38, gas storage tank to dryer pipe 39, dryer to nitrogen generator pipe 310, nitrogen generator to atmospheric layer pipe 311, nitrogen generator to air inlet pipe 312, nitrogen generator to humidifier pipe 313, humidifier to air inlet pipe 314, two-position two-way valve 315, two-position three-way valve 316, check valve (3171, 3172, 3173, 3174), energy supply system 4, solar power panel 41, wind power generator 42, intelligent control center 5.

[0026] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] The outer wall of the sealed granary 1 is covered with a polyurethane insulation layer 11, and a steel structure heightening layer 12 is arranged at the bottom to form a device space inside the heightening layer. The device space is arranged with an electric exhaust port 13, is connected with a nitrogen humidity balance regulation system 3, and is provided with a drainage port 15 at the bottom to discharge condensed water. The steel mesh pipe rack 16 is three-dimensionally distributed in the storage space to fix the water pipe group 24 and the gas pipe group 36 by means of the clips 161.

[0028] The U-shaped ground coupling pipe 22 is deeply buried in the ground, and a propylene glycol solution circulates in the pipe to exchange heat with the ground through the heat pump main unit 21. The temperature-controlled water tank 23 is equipped with a PID temperature control module, and the water temperature control accuracy is ±0.5℃. The temperature-controlled water tank 23 is led into the water inlet 25 and reaches the water pipe group 24, which is divided into multiple horizontal branches through the center of the top of the barn. Each branch extends downward to multiple vertical branches to pass through the grain storage space 14 to the equipment space and converges through the water outlet 26 back to the constant-temperature water tank 23. The vertical branches are 100mm-diameter stainless steel heat exchange pipes with a matrix distribution of 2m pipe spacing. When the temperature of the barn is controlled, the temperature spread by the water pipe group may be lower than the dew point temperature, resulting in condensation of water droplets on the outer wall of the water pipe group 24. Excessive condensation water may flow into the pipe arrangement chamber from the drain 15.

[0029] The nitrogen humidity balance control system 3 inhales natural air through the air compressor 31, and then immediately enters the drying machine 33 for drying treatment. The dry gas enters the nitrogen generator 34 for screening. The outlet of the nitrogen generator is connected with a nitrogen concentration sensor, which feeds back to the PLC controller in real time to adjust the inlet air pressure to 0.6-0.8MPa, ensuring that the output nitrogen purity is ≥96%. The high-concentration nitrogen gas then enters the humidifier 35. If dehumidification treatment is needed in the barn, the two-way three-way valve 316 can be automatically adjusted to enter the barn directly through the upper channel. If humidification treatment is needed, the two-way three-way valve 316 can be adjusted to enter the humidifier through the humidified wet film material, and then enter the air pipe group 36 from the air inlet 37. The air pipe group uses PE perforated pipes (with a hole diameter of 50mm). The low-oxygen humidity control gas diffuses into the barn through the perforations. The nitrogen humidity balance control system 3 is equipped with a humidity sensor to achieve accurate control of the humidity of high-concentration nitrogen gas to ±3%RH.

[0030] In a stable circulation state, the nitrogen humidity balance control system 3 directly leads the gas in the barn into the air compressor 31 through the electric exhaust port 13 to achieve internal circulation of the gas. Alternatively, the two-way two-way valve 316 can be adjusted to inhale an appropriate amount of natural air and mix it with the internal circulation gas before entering the nitrogen humidity control link.

[0031] The barn system operates in two modes:

[0032] High-temperature control mode: when the outdoor air temperature is higher than 25℃ and the grain temperature is higher than 15℃, the temperature control system starts the refrigeration cycle, and the cold water absorbs the heat of the grains through the water pipe group. The intelligent control center keeps the grain temperature at 15℃ according to the feedback of the sensors in each area. At the same time, the nitrogen generator maintains the oxygen concentration in the barn at 3.5%±0.5%, and the humidifier keeps the relative humidity stable at 60%RH through linkage with the sensors in the barn.

[0033] Overwintering storage mode: when the ambient temperature is less than 10 DEG C, the ground source heat pump switches to heating condition, the temperature-controlled water tank is lifted to hot water, the temperature is accurately controlled through the intelligent control center to make the temperature difference in the warehouse less than 2 DEG C, and the nitrogen gas humidity balance regulation system is intermittently used to maintain the humidity at 60% RH through low air exchange.

[0034] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct or indirect application in other related technical fields based on the technical concept of the present application, and the contents of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A stereoscopic matrix type intelligent storage system based on a ground source heat pump, comprising: The sealed granary (1), temperature control system (2), nitrogen humidity balance control system (3), energy supply system (4) and intelligent control center (5); the sealed granary (1) is used to store the grain that needs to be preserved, and the sealing design and temperature insulation design of the granary isolate the grain from the outside world; the temperature control system (2) provides suitable temperature for grain preservation through the three-dimensional water pipe group (24), preventing the influence of high temperature or low temperature on the grain; the nitrogen humidity balance control system (3) is used to generate low-oxygen humidity control gas which is delivered to the inside of the sealed granary (1) through the air pipe group (36), providing a low-oxygen constant humidity environment for grain preservation; the energy supply system (4) provides energy for the operation of the entire granary system; the intelligent control center (5) monitors the temperature, humidity and oxygen concentration in the granary in real time through sensors, and adjusts the temperature control system (2) and the nitrogen humidity balance control system (3) and the electric exhaust port (13) in linkage.

2. The barn of claim 1, wherein: The sealed granary (1) includes a polyurethane thermal insulation layer (11), a heightening layer (12), an electric exhaust port (13), a storage space (14), a device drainage port (15) and a steel mesh pipe rack (16); the heightening layer (12) separates the storage space (14) from the device space, creating space for pipe arrangement while avoiding direct contact of the grain with the ground; the electric exhaust port (13) is located in the device space and is connected with the nitrogen humidity balance control system (3) to achieve internal circulation of the gas, and the bottom of the pipe arrangement chamber is slightly inclined to allow condensed water to be discharged through the exhaust port (15); the steel mesh pipe rack (16) is three-dimensionally distributed in the storage space (14).

3. The barn of claim 1, wherein: The temperature control system (2) includes a heat pump host (21), a U-shaped ground coupled pipe (22), a water tank (23) and a water pipe group (24); the heat pump host (21) acts to cause the U-shaped ground coupled pipe (22) to exchange heat with the soil, achieving the effect of heating and cooling the circulating water in the water tank (23), and the water tank (23) connects the water pipe group (24) to circulate temperature control liquid to control the temperature of the granary.

4. The barn of claim 1, wherein: The nitrogen humidity balance control system (3) includes an air compressor (31), a gas storage tank (32), a drying machine (33), a nitrogen generator (34), a humidifier (35) and an air pipe group (36); the nitrogen generator (34) controls the output nitrogen purity to be >95% by adjusting the inlet air pressure, and the outlet is connected with a nitrogen concentration sensor to feed back to the intelligent control center in real time, the humidifier (35) uses wet membrane material to humidify, and the nitrogen humidity control accuracy is ±3%RH through the humidity sensor, and is directly connected with the air pipe group (36).

5. The barn of claim 1, wherein: The energy supply system (4) includes solar power generation (41) and wind power generation (42) to provide energy for system functions, and store energy for running during cloudy and rainy days and at night.

6. The barn of claim 1, wherein: The intelligent control center (5) collects environmental parameters in each area of the granary through a distributed sensor network, dynamically adjusts the branch flow of the water pipe group (24), the gas flow rate of the air pipe group (36) and the opening of the electric exhaust port (13) in linkage with the temperature control system (2) and the nitrogen humidity balance control system (3), and realizes three-dimensional uniform control.

7. The barn of claim 1, wherein: The granary comprises two working modes: high temperature control mode: when the temperature outside the granary is higher than 25 DEG C and the temperature of the grain is higher than 15 DEG C, the temperature control system (2) starts the refrigeration cycle to maintain the temperature of the grain at 10-15 DEG C, the oxygen concentration at 2-4%, and the humidity at 50-65% RH; overwintering storage mode: when the temperature inside the granary is less than 10 DEG C, the temperature control system (2) switches to the heating working condition to keep the temperature difference inside the granary at 10-15 DEG C, the oxygen concentration at 2-4%, and the humidity at 55% RH ± 5%.

8. The barn of claim 2, wherein: The steel mesh pipe frame (16) is distributed in the storage space in a three-dimensional matrix mode; the water pipe group (24) and the air pipe group (36) are fixed in the steel mesh pipe frame (16) by means of the clamps (161); the water pipe group (24) enters the storage space (14) from above the granary and flows out after being communicated with the equipment space at the bottom of the granary; the air pipe group (36) enters the equipment space and extends to the storage space (14) in parallel with the water pipe group (24), and the pipe wall is provided with air holes through which the humidity control gas diffuses to the storage space (14).

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