Building hog house heat recovery ventilation system

Abstract

The invention relates to the technical field of livestock and poultry breeding, in particular to a building hog house heat recovery ventilation system which comprises a heat recovery unit, a fresh air system, a waste gas system and a control system, the heat recovery unit comprises an equipment box body, a heat exchanger, an exhaust fan and an air feeder, and a fresh air opening, an air supply opening, an exhaust opening and a waste gas opening are formed in the equipment box body; the fresh air system comprises a fresh air channel, a plurality of fresh air pipelines and a plurality of air distribution pipes, and the fresh air pipelines communicate with the fresh air channel; the waste gas system comprises a waste gas pipeline and a filtering device, the filtering device is located in the exhaust outlet, and the waste gas pipeline communicates with the waste gas port; the control system comprises a controller, a plurality of temperature sensors and a plurality of humidity sensors. The controller is used for controlling and adjusting the heat exchanger, the exhaust fan and the air feeder. According to the heat recovery ventilation system for the building hog house, waste heat recovery treatment is conducted on waste gas in the hog house, the air environment in the building hog house is improved, and meanwhile the temperature control cost of the hog house in winter can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of livestock and poultry breeding, and in particular to a heat recovery ventilation system for a pig house in a building. Background Art

[0002] In recent years, in order to alleviate the contradiction between pig farming and the shortage of land resources, a large number of building pig houses have emerged. Compared with traditional flat pig houses, building pig houses have higher stocking density and more stringent requirements on ventilation systems. Among them, the environmental control problem of conflicting heating and ventilation in winter is common. How to ensure the stability and reliability of the building pig house environment in winter through scientific ventilation design and provide pigs with a comfortable living environment is particularly important in building pig houses.

[0003] Furthermore, due to the ongoing downturn in the livestock industry market, the pursuit of steady development requires continuous cost reduction while maintaining production performance. In winter, heating costs for piggeries account for a significant portion of production and operating expenses, making reducing winter heating costs a crucial component of cost reduction and efficiency improvement for piggeries. Since building-style piggeries generally have higher construction and operating costs than single-story piggeries, reducing winter heating costs and improving energy efficiency are particularly significant.

[0004] The current existing winter ventilation method for building pig houses uses fans to directly supply or exhaust air to the pig houses, and ventilation windows and other equipment are used to introduce fresh air. During this process, cold air from outside directly enters the pig houses. At the same time, heating equipment such as finned tubes and heaters are used to increase the temperature inside the pig houses. However, this method is used in winter. Due to the poor ventilation of pig houses, the entry of cold air will cause the temperature inside the pig houses to drop, thus significantly increasing heating costs. Therefore, it is very necessary to develop a ventilation system suitable for building pig houses that can solve the above problems, improve the air environment inside the pig houses, and reduce the heating operation costs of building pig houses in winter. Summary of the Invention

[0005] In response to the above problems, the main purpose of the present invention is to provide a heat recovery ventilation system for a building pig house, which recovers the waste heat from the exhaust gas in the pig house, improves the internal air environment of the building pig house, and reduces the temperature control cost of the pig house in winter.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a heat recovery ventilation system for a building pig house, comprising a heat recovery unit, a fresh air system, an exhaust gas system and a control system, wherein the heat recovery unit comprises an equipment box, a heat exchanger, an exhaust fan and a supply fan, and the equipment box is provided with a fresh air inlet, an air supply inlet, an exhaust gas outlet and an exhaust gas outlet; the fresh air system comprises a fresh air channel, a plurality of fresh air ducts and a plurality of air distribution ducts, the fresh air channel is distributed above the pig house, the plurality of fresh air ducts are connected to the fresh air channel, and the air distribution ducts are distributed above the pig pens of the pig house; the exhaust gas system comprises an exhaust gas duct and a filter device, the filter device is located in the exhaust gas outlet, and the exhaust gas duct is connected to the exhaust gas outlet; the control system comprises a controller, a plurality of temperature sensors and a plurality of humidity sensors, the controller is electrically connected to the temperature sensor, the humidity sensor, the heat exchanger, the exhaust fan and the supply fan respectively, and the controller is used to control and adjust the heat exchanger, the exhaust fan and the supply fan.

[0007] In other preferred embodiments, the outer port of the fresh air channel is connected to the air outside the pig house, the fresh air duct is connected to the fresh air outlet, the air distribution duct is connected to the air supply outlet, and a plurality of openings are distributed on the air distribution duct.

[0008] In other preferred embodiments, the heat recovery unit further includes a frame, the equipment box is fixed on the frame, and the heat exchanger, exhaust fan and supply fan are located in the equipment box.

[0009] In other preferred embodiments, the exhaust gas in the pig house is filtered by the filter device, enters the heat recovery unit from the exhaust port, undergoes heat exchange, and is discharged to the outside of the pig house through the exhaust pipe.

[0010] In other preferred embodiments, a partition is further provided in the equipment box, and the partition is located above the heat exchanger. The partition and the heat exchanger divide the internal space of the equipment box into a first chamber and a second chamber.

[0011] In other preferred embodiments, the air supply fan is located in the first chamber, the exhaust fan is located in the second chamber, the fresh air inlet is communicated with the first chamber, and the exhaust air outlet is communicated with the second chamber.

[0012] In other preferred embodiments, the temperature sensors and humidity sensors are distributed at different heights in the pig house.

[0013] Through the above technical solution, the beneficial effects of the present invention include: (1) The ventilation system of the present invention can improve the air quality in pig houses: in winter, the pig houses can be 100% ventilated without increasing energy consumption, reducing the concentration of carbon dioxide and ammonia, providing a clean air environment for livestock and poultry, which is conducive to their healthy growth; (2) In addition, the ventilation system of the present invention realizes waste gas heat energy recovery, energy saving and emission reduction, and makes full use of the waste hot air in the pig house and the fresh air outside the pig house for heat exchange, thereby achieving the dual goals of energy saving and environmental protection; (3) In addition, the ventilation system of the present invention achieves uniform air supply, and the fresh air outside the house is preheated by recycling the hot air inside the house, so that the fresh air does not cause cold stress to the livestock and poultry; (4) Furthermore, the ventilation system of the present invention can stabilize the temperature in the house. The heat recovery unit can automatically adjust the frequency conversion operation of the air supply and exhaust through the controller, so that the temperature fluctuation in the house is controlled within the range of ±1.5℃, ensuring the temperature in the house is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a structural diagram of the heat recovery ventilation system of the building pig house of the present invention.

[0016] Figure 2 It is a partial structural diagram of the heat recovery ventilation system of the building pig house of the present invention.

[0017] Figure 3 It is a partial structural diagram from another angle of the heat recovery ventilation system for a building pig house of the present invention.

[0018] Figures 4 to 6 It is a structural schematic diagram of the heat recovery unit of the heat recovery ventilation system of the building pig house of the present invention.

[0019] Figure 7 It is a structural schematic diagram of the filtering device of the heat recovery ventilation system of the building pig house of the present invention.

[0020] Description of Reference Numerals 1. Fresh air duct; 2. Heat recovery unit; 21. Equipment box; 211. Fresh air inlet; 212. Supply air outlet; 213. Exhaust air outlet; 214. Exhaust air outlet; 215. Partition; 216. First chamber; 217. Second chamber; 22. Heat exchanger; 23. Exhaust fan; 24. Supply fan; 25. Rack; 3. Air distribution duct; 4. Exhaust duct; 5. Pig house; 6. Fresh air duct; 7. Filter device; 71. Mounting frame; 72. Metal mesh; 8. Inspection door. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] like Figure 1The figure shows a schematic diagram of the structure of the heat recovery ventilation system of the building pig house of the present invention. The heat recovery ventilation system of the building pig house of the present invention is provided with a heat recovery unit 2, a fresh air system, an exhaust gas system and a control system, wherein the heat recovery unit 2 is used to exchange heat between the exhaust gas in the building pig house and the external fresh air to replace the air in the house. The fresh air system is provided with a fresh air channel 1, several fresh air ducts 6 and several air distribution ducts 3. The fresh air channel 1 is distributed above the pig house 5, and the several fresh air ducts 6 are respectively connected to the fresh air channel 1; the exhaust gas system is provided with an exhaust gas duct 4 and a filter device 7. The filter device 7 is located in the exhaust port 213, and the exhaust gas duct 4 is connected to the exhaust port 214. After the exhaust gas in the pig house 5 is filtered by the filter device 7, it enters the heat recovery unit 2 from the exhaust port 213, and is discharged to the outside of the pig house 5 through the exhaust gas duct 4 after heat exchange.

[0023] In other preferred embodiments, the outer port of the fresh air duct 1 is connected to the external air of the pig house 5, one end of the fresh air duct 6 is connected to the outside of the fresh air duct 1, and the other end is connected to the fresh air outlet 211. The air distribution duct 3 is evenly distributed above the pig pen of the pig house 5, and the air distribution duct 3 is connected to the air supply outlet 212. There are several openings distributed on the air distribution duct 3. Thus, the air distribution duct 3 is used to release the new hot air after heat exchange by the heat recovery unit 2 into the building.

[0024] The control system of the present invention is provided with a controller, several temperature sensors and several humidity sensors (not shown in the figure). The controller is electrically connected to the temperature sensor, humidity sensor, heat exchanger 22, exhaust fan 23 and supply fan 24 respectively. The controller is used to control and adjust the heat exchanger 22, exhaust fan 23 and supply fan 24. The temperature sensors and humidity sensors are distributed at different heights in the pig house 5 to facilitate monitoring of the temperature and humidity at different locations in the pig house 5. In other embodiments, the controller is also connected to the air distribution pipe 3 by signal. Specifically, remote control switches are provided at the openings on the air distribution pipe 3. The controller can adjust and control these remote control switches, thereby adjusting the opening, closing or air volume of the openings on the air distribution pipe 3. When the temperature detected by the temperature sensor of the pig house 5 corresponding to certain openings on the air distribution pipe 3 jumps out of the set suitable temperature range, the temperature sensor at that position sends a signal to the controller, and the controller remotely adjusts or controls the corresponding openings of the air distribution pipe 3 at the location of the temperature sensor. If the temperature is too high, the opening is closed, and if it is too low, the opening is opened or increased. Therefore, the purpose of adjusting the temperature or humidity in the pig house 5 to be uniform and moderate can be achieved.

[0025] Please refer to the figure Figures 4 to 6As shown, it is a structural schematic diagram of the heat recovery unit 2 of the present invention. The heat recovery unit 2 of the present invention is provided with an equipment box 21, a heat exchanger 22, an exhaust fan 23 and a supply fan 24. The equipment box 21 is provided with a fresh air inlet 211, an air supply outlet 212, an exhaust outlet 213 and a waste gas outlet 214; the heat recovery unit 2 is also provided with a frame 25, which is fixed next to the pig house 5. The equipment box 21 is made of a composite insulation board, and the equipment box 21 is fixed on the frame 25. The heat exchanger 22, the exhaust fan 23 and the supply fan 24 are located in the equipment box 21. A partition 215 is also provided in the equipment box 21 of the present invention. The partition 215 is located above the heat exchanger 22, and the partition 215 and the heat exchanger 22 separate the equipment box 21 into a first chamber 216 and a second chamber 217. The first chamber 216 and the second chamber 217 are not connected to each other. The exhaust fan 23 and the supply fan 24 are respectively located on both sides of the heat exchanger 22, wherein the supply fan 24 is located in the first chamber 216, and the exhaust fan 23 is located in the second chamber 217. The fresh air inlet 211 is connected to the first chamber 216, and the exhaust air outlet 214 is connected to the second chamber 217.

[0026] In addition, the heat recovery unit 2 of the present invention is further provided with an inspection door 8, which is located on the left and right sides of the equipment housing 21 and is respectively arranged opposite the exhaust fan 23 and the supply fan 24. The inspection door 8 facilitates the inspection and maintenance of the exhaust fan 23, the supply fan 24 or the heat exchanger 22 at any time. It should be noted that the structure of the heat exchanger 22 in the present invention is the structure of the existing heat exchanger. The heat exchanger 22 is provided with a heat source side channel and a heat load side channel. The gases in the two channels exchange heat, wherein the upstream end of the heat source side channel is in communication with the second chamber 217, and the downstream end is in communication with the exhaust port 214. The upstream end of the heat load side channel is in communication with the first chamber 216, and its downstream end is in communication with the supply fan 24 or the supply port 212.

[0027] The working principle of the heat recovery unit 2 of the present invention is that, since the exhaust port 213 is connected to the pig house 5, the hot exhaust gas in the pig house 5 enters the second chamber 217 of the equipment box 21 through the exhaust port 213 under the action of the exhaust fan 23, and the hot exhaust gas then enters from the upstream end of the heat source side channel of the heat exchanger 22, exchanges heat with the other heat load side channel, and finally discharges the heat exchanged exhaust gas through the exhaust port 214, and then enters the exhaust pipe 4 and is discharged to the outside; and the fresh air port 211 on the other side is externally connected to a fresh air duct 6. Since the fresh air duct 1 is connected to the fresh air duct 6, in other embodiments, the fresh air duct 1 is longitudinally located above the pig house 5, and the fresh air duct 6 is horizontally and vertically arranged on both sides or one side of the fresh air duct 1. The external fresh air first enters the fresh air duct 1, Then it passes through the fresh air duct 6 and enters the first chamber 216 of the equipment box 21 from the fresh air outlet 211. The flow of this process is due to the fact that the blower 24 discharges the hot air in the first chamber 216 into the pig house 5 through the air outlet 212, so a pressure difference is generated between the inside and outside of the first chamber 216. Therefore, the external fresh air can smoothly enter from the fresh air outlet 211, and then enter the upstream end of the heat load side channel in the heat exchanger 22. After heat exchange with the hot exhaust gas in the heat source side channel, the temperature of the new air is increased, and finally enters the air distribution pipe 3 through the air outlet 212 through the blower 24, and is then released into the pig house 5 through the opening on the air distribution pipe 3. In this way, the air circulation in the pig house 5 is realized, and most of the heat of the exhaust gas is recovered to increase the temperature of the new air, thereby reducing the heating cost of the pig house 5.

[0028] In other preferred embodiments, a filter screen (not shown) is provided on the outside of the fresh air inlet 211 of the present invention. The filter screen can filter the external air entering the fresh air inlet 211 to prevent larger particles or pollutants from entering the device and affecting the normal use of various mechanisms. In addition, a filter device 7 (such as Figure 7 As shown in the figure, the filter device 7 is provided with a mounting frame 71 and a metal mesh 72, an electrostatic fiber adsorption layer and a carbon adsorption deodorization layer sequentially located on the mounting frame, wherein the mounting frame 71 is fixed to the exhaust port 213 by bolts. The filter device 7 can filter the hot exhaust gas in the pig house 5 before it enters the heat recovery unit 2, thereby keeping the equipment box 21, especially the second chamber 217, clean and dry, thereby improving the service life of the equipment.

[0029] During use, the heat recovery ventilation system for building pig houses of the present invention solves the problems of uneven ventilation, low inlet temperature and high heating energy consumption in winter pig houses by installing a heat recovery unit 2, a fresh air system and an exhaust gas system in the pig house 5. The route is as follows: (1) Fresh air ventilation path: Fresh air outside the house → fresh air channel 1 → fresh air duct 6 → heat recovery unit 2 → air distribution duct 3 → inside the house; (2) The exhaust gas ventilation path is as follows: Inside the house → heat recovery unit 2 → exhaust gas pipe 4 → outside the house; The ventilation system of the present invention can improve the air quality in the pig house in the building. In winter, the pig house 5 can be 100% ventilated without increasing energy consumption, reducing the concentration of carbon dioxide and ammonia, providing a clean air environment for livestock and poultry, and promoting their healthy growth. In addition, the ventilation system of the present invention realizes waste gas heat energy recovery, energy saving and emission reduction, and makes full use of the waste hot air in the pig house and the fresh air outside the pig house for heat exchange, thereby achieving the dual goals of energy saving and environmental protection. In addition, the ventilation system of the present invention realizes uniform air supply, and the fresh air outside the house is heated and preheated by recovering the hot air in the house, so that the fresh air does not cause cold stress to the livestock and poultry. Furthermore, the use of the ventilation system of the present invention can make the temperature in the house stable, and the heat recovery unit 2 can automatically adjust the frequency conversion operation of the air supply and exhaust through the controller, so that the temperature fluctuation in the house is controlled within the range of ±1.5°C, ensuring the temperature in the house is stable.

[0030] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A heat recovery ventilation system for pig houses in buildings, characterized in that: include: The heat recovery unit (2) comprises an equipment box (21), a heat exchanger (22), an exhaust fan (23) and a supply fan (24), wherein the equipment box (21) is provided with a fresh air inlet (211), an air supply inlet (212), an exhaust outlet (213) and an exhaust air outlet (214); A fresh air system comprises a fresh air channel (1), a plurality of fresh air ducts (6) and a plurality of air distribution ducts (3), wherein the fresh air channel (1) is distributed above the pig house (5), the plurality of fresh air ducts (6) are all connected to the fresh air channel (1), and the air distribution ducts (3) are distributed above the pig pens of the pig house (5); An exhaust system comprising an exhaust pipe (4) and a filter device (7), wherein the filter device (7) is located in the exhaust port (213), and the exhaust pipe (4) is in communication with the exhaust port (214); A control system includes a controller, a plurality of temperature sensors, and a plurality of humidity sensors. The controller is electrically connected to the temperature sensors, the humidity sensors, a heat exchanger (22), an exhaust fan (23), and a blower (24), respectively. The controller is used to control and adjust the heat exchanger (22), the exhaust fan (23), and the blower (24).

2. The heat recovery ventilation system for pig houses in buildings according to claim 1 is characterized in that: The outer port of the fresh air channel (1) is in communication with the air outside the pig house (5), the fresh air duct (6) is in communication with the fresh air outlet (211), the air distribution pipe (3) is in communication with the air supply outlet (212), and a plurality of openings are distributed on the air distribution pipe (3).

3. The heat recovery ventilation system for pig houses in buildings according to claim 1 is characterized in that: The heat recovery unit (2) further comprises a frame (25), the equipment box (21) is fixed on the frame (25), and the heat exchanger (22), the exhaust fan (23) and the air supply fan (24) are located in the equipment box (21).

4. The heat recovery ventilation system for pig houses in buildings according to claim 1, characterized in that: The exhaust gas in the pig house (5) is filtered by the filter device (7), enters the heat recovery unit (2) from the exhaust port (213), undergoes heat exchange, and is discharged to the outside of the pig house (5) through the exhaust pipe (4).

5. The heat recovery ventilation system for pig houses in buildings according to claim 1 is characterized in that: A partition (215) is further provided in the equipment box (21), and the partition (215) is located above the heat exchanger (22). The partition (215) and the heat exchanger (22) divide the internal space of the equipment box (21) into a first chamber (216) and a second chamber (217).

6. The heat recovery ventilation system for pig houses in buildings according to claim 5, characterized in that: The air supply fan (24) is located in the first chamber (216), the exhaust fan (23) is located in the second chamber (217), the fresh air inlet (211) is in communication with the first chamber (216), and the exhaust air outlet (214) is in communication with the second chamber (217).

7. The heat recovery ventilation system for pig houses according to any one of claims 1 to 6, characterized in that: The temperature sensors and humidity sensors are distributed at different heights in the pig house (5).

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