A hog farm deodorization system and method

Abstract

The application discloses a pig farm deodorization system and method, relates to the technical field of odor purification, and solves the problems of large water consumption, high chemical reagent cost, difficult maintenance of physical adsorption, and easy blockage of spray nozzles in the prior art, and the system comprises a pretreatment area, a spraying area, a spraying area and a demisting area which are sequentially connected, a dust screen is arranged between the pretreatment area and the spraying area, a plurality of sprayers are arranged in the spraying area, a plurality of sprayers for spraying ozone water are arranged in the spraying area, the demisting area is provided with a physical demister capable of adjusting the angle of a demisting plate, and a water collecting pool, a sedimentation tank and an ozone water collecting pool for water circulation are further arranged, so that the risk of blockage of the sprayers and the sprayers is reduced, the distributed odor is subjected to cooling, humidifying, dust removal and other treatments in the spraying area, then the odor is subjected to purification treatment by using atomized ozone water in the spraying area, the deodorization effect is more significantly increased, and meanwhile, waste water recycling is realized.

Description

Technical Field

[0001] This application relates to the field of odor purification technology, and in particular to an odor deodorization system and method for pig farms. Background Technology

[0002] my country is a major pig-producing country, ranking first in the world in terms of pig numbers. With the development of pig farming technology, my country's pig farming industry is transitioning from traditional pig farming to modern intensive pig farming. Intensive farming can reduce costs and labor expenses, but at the same time, the amount of manure generated increases significantly. Odors generated during the storage and treatment of manure account for about 65% of the total odor in pig farms, odors generated in pig houses (including odors from animal bodies and unremoved feces and urine) account for about 25%, and odors generated during feed processing and storage account for about 10%.

[0003] The foul odors emitted from pig farms consist of more than 230 components, with ammonia, hydrogen sulfide, and volatile fatty acids being the most harmful. Ventilation volumes can reach tens to hundreds of thousands of cubic meters per hour, resulting in daily emissions of hundreds of tons. The odor spreads for several kilometers via ventilation systems or natural winds, creating a wide-area low-concentration pollution zone that causes sensory discomfort to residents. The composition of odors from pig farms is complex and highly variable; during the high temperatures of summer, the amount of odor emitted can increase dramatically by 3 to 5 times.

[0004] Existing pig farms often rely on end-of-pipe deodorization, but end-of-pipe treatment often depends on a single technology, such as biological deodorization, chemical deodorization, physical adsorption, physical spraying, etc.

[0005] Biological deodorization technology: This technology uses microorganisms or enzymes to decompose organic matter in odorous gases, such as ammonia (NH3) and hydrogen sulfide (H2S). Common forms include biofilters and bio-enzyme atomization sprays. For example, biofilter walls can be installed in sewage treatment areas or ventilation systems, or bio-enzyme preparations can be sprayed to decompose odor molecules into harmless substances. However, the survival of these microorganisms is highly dependent on environmental conditions, such as odor concentration, temperature, and humidity. If their suitable survival range is not met, they are prone to inactivation.

[0006] Chemical deodorization technology involves spraying chemical agents (such as sulfuric acid, hypochlorous acid, acetic acid, etc.) to oxidize or neutralize odor components. However, this method requires additional chemical agents, resulting in high operating costs. Furthermore, it generates secondary pollution from waste liquid, requiring additional treatment.

[0007] Physical adsorption method: This method uses adsorbents (activated carbon, zeolite, etc.) to adsorb odor components. It is suitable for enclosed pigsties or manure treatment areas. However, activated carbon or zeolite adsorbents are prone to saturation due to odor penetration, requiring frequent replacement. Biological filters have insufficient capacity to handle large volumes of gas, and the pressure drop in the packing layer is significant. Regular replacement of the adsorbent material is necessary.

[0008] Physical spraying technology: This method combines horizontal or vertical ventilation with water curtain spraying. It adsorbs dust and soluble gases (such as ammonia) through gas-liquid mixing, and partially decomposes them using microorganisms. Large-scale pig farms commonly use this type of system, selecting the spraying module based on the ventilation volume. However, this method has excessively high operating costs because there is no filtration section after spraying, resulting in excessive water escape and high water consumption. Furthermore, relying solely on spraying for deodorization leads to nozzle clogging, uneven water distribution, and an inability to effectively treat mixed pollutants such as hydrogen sulfide and ammonia, resulting in large fluctuations in odor concentration. Summary of the Invention

[0009] The purpose of this application is to overcome the problems of large water consumption, high cost of chemical agents, difficulty in maintaining physical adsorption, and easy clogging of spray nozzles in the existing technology for deodorizing pig farms, and to provide a deodorizing system and method for pig farms.

[0010] In a first aspect, a deodorization system for a pig farm is provided, comprising a pretreatment zone, a spray zone, a misting zone, and a defogging zone connected in sequence. The pretreatment zone has multiple intermittently operating fans arranged along the airflow direction at its air inlet. A dust-blocking cloth is installed between the pretreatment zone and the spray zone. The spray zone has multiple sprayers connected to a spray pump. The misting zone has multiple sprayers connected to a misting pump. The input end of the misting pump is connected to an ozone water source. The defogging zone has a physical defogging device with an adjustable defogging plate angle. The bottoms of both the spray zone and the misting zone are connected to a water collection tank. The upper layer of the water collection tank is connected to a sedimentation tank. The defogging zone has a water collection trough for collecting ozone water, and the water collection trough is connected to an ozone water collection pool. The input end of the spray pump can selectively obtain water from a clean water tank, a sedimentation tank, and an ozone water collection pool.

[0011] In some possible implementations, the air intake and spray water in the spray zone move in opposite directions.

[0012] In some possible implementations, a partition is provided between the pretreatment zone and the spraying zone, and an air intake grille is provided at the upper end of the partition.

[0013] In some possible implementations, the air duct of the spray zone is set at an angle, and the spray zone is divided into several sub-spaces along the air duct. Each sub-space is equipped with multiple sprayers, and the sprayers in each sub-space are controlled uniformly by the same spray valve.

[0014] In some possible implementations, the ozone water source includes an ozone water generating device and an ozone water tank, with the output end of the ozone water generating device connected to the ozone water tank via a water pipe, and the input end of the spray pump connected to the ozone water tank.

[0015] In some possible implementations, the physical demister includes a first frame, the inner bottom surface of which is connected to a rotatable second frame via bearings. The upper end of the second frame is connected to the shaft of a first servo motor. Multiple demister plates are installed within the second frame, each comprising an upper demister plate, a middle demister plate, and a lower demister plate. Both ends of each of the upper, middle, and lower demister plates are axially connected to the second frame via connecting shafts. Each of the upper, middle, and lower demister plates has a notch in its middle section, and a fixed shaft is fixed within each notch. A sprocket is fixedly fitted onto the outer wall of each fixed shaft. The sprocket in the middle of the lower demister plate is connected to a sprocket fitted onto the outer wall of the second servo motor shaft via a chain. The sprocket in the middle of the middle demister plate is connected to a sprocket fitted onto the outer wall of the third servo motor shaft via a chain. The sprocket in the middle of the upper demister plate is connected to a sprocket fitted onto the outer wall of the fourth servo motor shaft via a chain.

[0016] In some possible implementations, the bottom ends of the upper demister, middle demister, and lower demister are all provided with water collection tanks for collecting ozone water, and the water collection tanks are all connected to the ozone water collection pool.

[0017] In some possible implementations, the sedimentation tank is equipped with multiple vertically arranged filter screens, and both the sedimentation tank and the water collection tank are provided with sewage outlets at their bottom ends, each of which is equipped with a sewage valve.

[0018] In some possible implementations, the sprayer is equipped with a motor that drives the spray head to rotate, the sedimentation tank is equipped with multiple vertically arranged filter screens, and both the sedimentation tank and the water collection tank are provided with a sewage outlet at the bottom, and each sewage outlet is equipped with a sewage valve.

[0019] In a second aspect, a method for deodorizing a pig farm is provided, comprising the deodorization system as described in the first aspect, wherein the deodorization method includes:

[0020] Start the fan to send the odor into the pretreatment area, and use the dust filter cloth and air screen to remove particulate matter from the odor;

[0021] The spray pump is started to spray the odor with the sprayer. The priority of the water source for the spray pump is ozone water collection tank, sedimentation tank and clean water tank.

[0022] The spray pump is started to atomize ozone water and bring it into contact with the odor, so that the ozone can directly and indirectly oxidize the malodorous substances in the odor.

[0023] The odor concentration is detected before the odor enters the defogging zone. The power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone source are controlled according to the odor concentration. The power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone source are positively correlated with the ozone concentration.

[0024] After the odor passes through the physical demister, the concentration of the emitted odor is detected. Based on the emitted odor concentration, the power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone water source are adjusted.

[0025] The water collection rate in the ozone water collection tank is monitored, and the angle of the demister plate of the physical demister is adjusted according to the water collection rate.

[0026] The natural wind direction at the output end of the defogging zone is detected, and the air outlet direction of the physical defogging device is adjusted according to the natural wind direction so that the air outlet direction of the physical defogging device is opposite to the natural wind direction.

[0027] This application has the following beneficial effects: In this application, a fan can be used to introduce odorous gases from a pig farm into a pretreatment area. A dust-proof cloth and air filter are used to filter and evenly distribute the odorous gases, removing particulate impurities and reducing the risk of clogging of sprayers and atomizers. The evenly distributed odorous gases then enter the spraying area for cooling, humidification, and dust removal, while simultaneously absorbing water-soluble malodorous components. Subsequently, the odorous gases enter the spraying area, where ozone water is atomized and sprayed out using a sprayer. This allows for full contact with the odorous gases, and ozone molecules directly undergo an oxidation-reduction reaction with the malodorous gas molecules. Ozone attacks and breaks the chemical bonds of these molecules, decomposing them into harmless or less odorous substances. Furthermore, ozone in water will... The process involves decomposition, and under the influence of hydroxide ions in the water, hydroxyl radicals, which have even stronger oxidizing power than ozone itself, are generated. These hydroxyl radicals can more thoroughly degrade malodorous substances that are difficult to oxidize directly with ozone, thus achieving a highly efficient and thorough deodorization effect. Furthermore, the water from the spray area and the misting area is recycled to the same ozone water collection tank, where the remaining ozone in the spray water can continue to react, achieving preliminary self-cleaning of the wastewater in the collection tank. Then, the upper layer of water in the collection tank flows to the sedimentation tank, where it is stabilized by sedimentation. The upper layer of water in the sedimentation tank is then supplied to the spray pump, realizing the recycling of wastewater. Moreover, no chemical agents or physical fillers are required, effectively reducing the cost of deodorization. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1This is a structural diagram of the deodorization system for a pig farm according to Embodiment 1 of this application;

[0031] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0032] Figure 3 This is a longitudinal cross-sectional view of the physical demister in the deodorization system of the pig farm according to Embodiment 1 of this application;

[0033] Figure 4 This is a cross-sectional view of the physical demister in the deodorization system of the pig farm according to Embodiment 1 of this application;

[0034] Figure 5 This is a longitudinal cross-sectional view of the second frame in the pig farm deodorization system of Embodiment 1 of this application;

[0035] Figure 6 yes Figure 5 Enlarged view of the structure at point B;

[0036] Figure 7 This is a cross-sectional view of the second frame in the pig farm deodorization system of Embodiment 1 of this application;

[0037] Figure 8 yes Figure 7 Enlarged view of the structure at point C;

[0038] Figure 9 This is a flowchart of the deodorization method for pig farms according to Embodiment 2 of this application.

[0039] Figure label:

[0040] 100. Pretreatment area; 101. Fan; 102. Dustproof cloth / air mesh; 103. Baffle; 104. Air inlet grille; 200. Spraying area; 201. Sprayer; 202. Spray pump; 203. Clean water tank; 204. First water inlet valve; 300. Spraying area; 301. Sprayer; 302. Spray pump; 303. Ozone water source; 3031. Ozone water generating device; 3032. Ozone water tank; 3033. Second water inlet valve; 304. First subspace; 305. First spray valve; 306. Second subspace; 307. Second spray valve; 308. Third subspace; 309. Third spray valve; 310. Fourth subspace; 311. Fourth spray valve ; 400, Demisting Zone; 401, Physical Demister; 402, Demisting Plate; 403, Water Collection Tank; 404, First Frame; 405, Second Frame; 406, Upper Demisting Plate; 407, Middle Demisting Plate; 408, Lower Demisting Plate; 409, Fixed Shaft; 410, Sprocket; 411, Chain; 412, First Servo Motor; 413, Second Servo Motor; 414, Third Servo Motor; 415, Fourth Servo Motor; 500, Water Collection Pool; 600, Ozone Water Collection Pool; 601, First Valve; 602, Second Valve; 700, Sedimentation Tank; 701, Filter Screen; 702, Drain Outlet; 703, Drain Valve; 704, Baffle; 800, Deodorization Chamber. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1As shown in Embodiment 1 of this application, a deodorization system for a pig farm includes a deodorization chamber 800. One end of the deodorization chamber 800 is open, and the roof of the other end is open. It is sequentially divided into a pretreatment zone 100, a spray zone 200, a misting zone 300, and a demisting zone 400. The demisting zone 400 is located above the spray zone 300. To collect the ozone water separated from the demisting zone 400 and to design the air duct in the demisting zone 400 as oblique, a space is isolated in the upper left corner of the spray zone 300 as an ozone water collection tank 600, allowing the water separated from the demisting zone 400 to flow into the ozone water collection tank 600. A sedimentation tank 700 and a water collection tank 500 are provided below the deodorization chamber 800. The sedimentation tank 700 and the water collection tank 500 are separated by a baffle 704. The supernatant in the water collection tank 500... The liquid can flow into the sedimentation tank 700 from above the baffle 704. After sufficient sedimentation, it can be used as the water source for the spray pump 202. Multiple vertically arranged filter screens 701 are installed in the sedimentation tank 700. The filter screens 701 can be removed for cleaning and removal of sludge from the bottom of the sedimentation tank 700. The end of the sedimentation tank 700 away from the collection tank 500 is connected to the spray pump 202. The vertically arranged filter screens 701 can be used to filter the water in the sedimentation tank 700 and slow down the flow rate, thereby preventing the spray pump 201 from clogging and reducing the impact of water flow on sedimentation. Both the sedimentation tank 700 and the collection tank 500 are equipped with a drain outlet 702 at the bottom. Each drain outlet 702 is equipped with a drain valve 703. The sedimentation tank 700 and the collection tank 500 are cleaned regularly through the drain outlets 702. The lower layer water in the collection tank 500 is periodically discharged to the water treatment system.

[0044] In the pretreatment zone 100, multiple fans 101 are installed to introduce odorous gases from the pig farm into the deodorization chamber 800. A dust-blocking cloth net 102 is installed between the pretreatment zone 100 and the spray zone 200. The dust-blocking cloth net 102 has a one-way air permeability of over 98%, providing excellent ventilation performance. The dust-blocking cloth net 102 helps to distribute air evenly and reduce wind speed, which is beneficial for improving the deodorization effect of subsequent treatments, preventing backflow of mist, and removing large particles and dust from the odorous gases. The dust-blocking cloth net 102 is made of corrosion-resistant materials such as polyethylene. The fan 101 is arranged along the airflow direction and operates intermittently. A baffle 103 is provided at the air outlet of the fan 101 for airflow guidance. An air inlet grille 104 is provided at the upper end of the baffle 103. The odor introduced by the fan 101 passes through the air inlet grille 104 at the upper end of the baffle 103 and the dust filter cloth 102 into the spray area 200. The additional function of the dust filter cloth 102 is to filter particulate impurities in the odor and to evenly distribute the odor entering the sprayer 201, so that the sprayer 201 is not easily blocked by particulate matter carried in the odor.

[0045] In the spray zone 200, multiple sprayers 201 are installed on the side away from the fan 101. Each sprayer 201 is connected to a spray pump 202. The water spray direction of the sprayers 201 is opposite to the airflow direction of the odorous gas blown by the fan 101, allowing the water sprayed by the sprayers 201 to counteract the odorous gas, ensuring more thorough contact between the gas and water. This provides dust removal, cooling, humidification, and absorption of water-soluble malodorous components in the odorous gas. The sprayers 201 also keep the dust-blocking cloth 102 moist (dust absorption) and clean it. The sprayers 201 are installed on spray pipes made of corrosion-resistant materials such as polyethylene. There are 2 to 4 spray pipes in total, and 7 to 15 wide-angle sprayers 201 are installed on each spray pipe. The nozzle flow rate of a single sprayer 201 is 5.4 L / min.

[0046] The water source for the spray pump 202 in the spray zone 200 is divided into three types. The water source is selected according to the actual situation to achieve effective recycling of water resources.

[0047] ① When the ozone water collection tank 600 has sufficient water, the spray pump 202 will preferentially draw water from the ozone water collection tank 600 for spraying. It can use the residual ozone in the ozone water collection tank 600 to perform preliminary deodorization treatment on the odor in the spray area 200, and at the same time realize the recycling of ozone water.

[0048] ② When the water storage in the ozone water collection tank 600 is insufficient and the upper layer of liquid in the sedimentation tank 700 has sufficient sedimentation, the spray pump 202 will preferentially draw water from the upper layer of the sedimentation tank 700 for spraying, which can realize the recycling of spray water in the spray zone 200 and ozone water in the spray zone 300.

[0049] ③ If the water storage in the ozone water collection tank 600 is insufficient and the upper layer of liquid in the sedimentation tank 700 has not settled sufficiently, water is taken from the water purification tank 203 for spraying. The water in the water purification tank 203 can come from other water sources such as tap water or well water. The water purification tank 203 is connected to the water source through a water pipe and the water pipe is equipped with a first water inlet valve 204 to control the water inlet of the water purification tank 203. It is necessary to pay attention to maintaining the liquid level in the water purification tank 203. When the liquid level is lower than the preset height, water needs to be added to the water purification tank 203 in time.

[0050] In the spray zone 300, the spray zone 300 is divided into several sub-spaces along the inclined air duct. Each sub-space is equipped with multiple sprayers 301 and the sprayers 301 in each sub-space are controlled by the same spray valve. Due to the inclined air duct, the droplets sink under the action of gravity, and the odor diffuses from bottom to top, forming a countercurrent with the droplets, which can provide a deodorizing effect. For example, in this embodiment, the space is divided into four subspaces: a first subspace 304, a second subspace 306, a third subspace 308, and a fourth subspace 310. Above each subspace is a spray mesh surface evenly distributed with several sprayers 301. The sprayers 301 are wide-angle nozzles with a single nozzle flow rate of 1.5 L / min. To enhance the deodorizing effect, several sprayers 301 can also be installed at the ends of the subspaces. Specifically, the sprayers 301 in the first subspace 304 are connected to a spray pump 302 via a water pipe equipped with a first spray valve 305; the sprayers 301 in the second subspace 306 are connected to the spray pump via a water pipe. 302 is connected, and the water pipe is equipped with a second spray valve 307; the sprayer 301 of the third subspace 308 is connected to the spray pump 302 through a water pipe, and the water pipe is equipped with a third spray valve 309; the sprayer 301 of the fourth subspace 310 is connected to the spray pump 302 through a water pipe, and the water pipe is equipped with a fourth spray valve 311, so that the sprayers 301 in each subspace can be uniformly controlled through a spray valve. The spray pump 302 sprays ozone water from the ozone water source 303 from the sprayer 301 to fully contact the odor and oxidize the malodorous substances in the odor. The number of spray valves opened is automatically adjusted according to the air volume, and the concentration of ozone water is automatically adjusted according to the odor concentration.

[0051] In this embodiment, the ozone water source 303 includes an ozone water generating device 3031 and an ozone water tank 3032. The ozone water generating device 3031 is used to produce ozone water and can control the concentration of the produced ozone water through parameter adjustment. The output end of the ozone water generating device 3031 is connected to the ozone water tank 3032 through a water pipe to send the produced ozone water into the ozone water tank 3032 for use by the spray pump 302. A second water inlet valve 3033 is installed on the water pipe between the ozone water generating device 3031 and the ozone water tank 3032 to control the water inlet of the ozone water tank 3032. The input end of the spray pump 302 is connected to the ozone water tank 3032 through a water pipe.

[0052] In this embodiment, ozone water (concentration between 0 and 30 mg / L) is atomized into liquid particles using a spray pump 302 and a sprayer 301 under high pressure. These particles are evenly distributed throughout the spray area 300, ensuring thorough contact between the odor-containing liquid particles and the odor. Ozone attacks and breaks the chemical bonds of these molecules, decomposing them into harmless or less odorous substances. Furthermore, ozone spontaneously decomposes in water, generating hydroxyl radicals with even stronger oxidizing power than ozone itself, triggered by hydroxide ions in the water. These hydroxyl radicals can more thoroughly degrade malodorous substances that are difficult to oxidize directly with ozone. Simultaneously, the liquid particles adhere to dust particles in the odor, significantly increasing their weight and facilitating dust settling, thus reducing the dust content in the odor. The ozone water has disinfection and sterilization properties. After spraying and settling, it collects in a collection tank 500. Unreacted ozone continues to react in the collection tank 500, providing preliminary purification of the wastewater and reducing subsequent water treatment costs.

[0053] In the demisting zone 400, a physical demister 401 is provided for removing water mist from the gas blown out of the sprayer 301, wherein, for example... Figures 3-7 As shown, the physical demister 401 includes a first frame 404. The inner bottom surface of the first frame 404 is connected to a rotatable second frame 405 via bearings to reduce the friction between the first frame 404 and the second frame 405. The second frame 405 is a cylindrical structure with open ends. The upper end of the second frame 405 is connected to the shaft of a first servo motor 412, which is fixed by a bracket. Multiple demister plates 402 are installed inside the second frame 405. The cross-section of the demister plates 402 is streamlined, and the spacing between the demister plates 402 is set. Each demister plate 402 includes an upper demister plate 406, a middle demister plate 407, and a lower demister plate 408. Both ends of the upper demister plate 406, the middle demister plate 407, and the lower demister plate 408 are axially connected to the second frame 405 via connecting shafts. A notch is opened in the middle of the upper demister plate 406, the middle demister plate 407, and the lower demister plate 408. Figure 8As shown, each notch is fixed with a fixed shaft 409, and each fixed shaft 409 has a sprocket 410 fixedly sleeved on its outer wall. The sprocket 410 in the middle of the lower demisting plate 408 is connected to the sprocket 410 sleeved on the outer wall of the shaft of the second servo motor 413 by a chain 411. The sprocket 410 in the middle of the middle demisting plate 407 is connected to the sprocket 410 sleeved on the outer wall of the shaft of the third servo motor 414 by a chain 411. The sprocket 410 in the middle of the upper demisting plate 406 is connected to the sprocket 410 sleeved on the outer wall of the shaft of the fourth servo motor 415 by a chain 411. The second servo motor 413, the third servo motor 414, and the fourth servo motor 415 are all fixed by brackets. 3. The third servo motor 414 and the fourth servo motor 415 can drive the corresponding chain 411 to perform circular motion. The second servo motor 413 can drive the sprocket 410 at one end of the lower demister 408 to rotate synchronously via the chain 411, thereby causing the lower demister 408 to rotate synchronously and at the same angle. The angle adjustment of the upper demister 406 and the middle demister 407 is the same. The angle adjustment range of the upper demister 406, the middle demister 407, and the lower demister 408 is 30°~150°. The deflection angle of the demister 402 is controlled by controlling the number of rotations of the servo motors. The center distance of each sprocket 410 is consistent, and the number of strokes of the chain 411 and the size of the sprocket 410 are consistent. While ensuring that each demister 402 can deflect at the same angle and by the same amount, it also ensures that the distance between adjacent demisters 402 is equal, avoiding turbulence problems that may be caused by different distances.

[0054] When the gas flow rate fluctuates greatly, the droplet separation factor decreases. Based on the change in gas flow rate, the angle of the demister plate 402 is adjusted accordingly to stabilize the flow rate within a suitable range, thereby keeping the droplet separation factor stable, stabilizing the demisting efficiency, and ensuring a stable demisting effect. This allows more water to be collected, achieving the goal of water conservation.

[0055] In order to collect water droplets on the upper demister plate 406, the middle demister plate 407, and the lower demister plate 408, a water collection tank 403 for collecting ozone water is provided at the bottom of each of the three plates. The water collection tanks 403 are all connected to the ozone water collection tank 600, so that the water droplets on the upper demister plate 406, the middle demister plate 407, and the lower demister plate 408 can eventually flow into the ozone water collection tank 600 for use by the spray pump 202.

[0056] The working mode of the physical demister 401 is as follows: It is linked with the fan 101. By controlling the air volume, it controls the second servo motor 413, the third servo motor 414 and the fourth servo motor 415 to drive the upper demister plate 406, the middle demister plate 407 and the lower demister plate 408 to generate different windward angles. The larger the air volume, the smaller the angle between adjacent demister plates 402, and the smaller the air volume, the larger the angle between adjacent demister plates 402, thereby ensuring the collection efficiency of fog droplets. Linked with the wind vane, if the air outlet direction of the physical demister 401 is the same as the natural wind direction, the angle of the upper demister plate 406 is adjusted by the fourth servo motor 415 (from 30° to 150°, without affecting the demisting effect). If the air outlet direction of the physical demister 401 is not in the same straight line as the natural wind direction, the air outlet direction of the physical demister 401 is adjusted by the rotation of the first servo motor 412 (deflection 0~90°) so that the air outlet direction of the physical demister 401 is opposite to the natural wind direction above the physical demister 401. This allows the treated odor to be counteracted by the natural wind, preventing the water mist from carrying the odor to more distant residential areas.

[0057] Self-cleaning mode: Linked with sprayer 301, sprayer 301 is driven by a motor to automatically rotate the nozzle, and the water mist can achieve 360-degree all-round coverage during the rotation. Controlling the second servo motor 413, the third servo motor 414 and the fourth servo motor 415 drives the upper demister 406, the middle demister 407 and the lower demister 408 to tilt in the same direction, which can achieve cleaning of the spray area 300 and the demister 402.

[0058] During operation, the odor from the pig farm is drawn into the deodorization chamber 800 by the fan 101. It first enters the pretreatment zone 100, passing through baffles and dust-proof cloth 102 to remove a large amount of dust and other particulate matter. The odor then evenly contacts the spray zone 200. The upper layer is the air intake grille 104. The odor enters the upper layer of the spray zone 200 through the air intake grille at the top of the baffle 103. After being sprayed by the upper spray zone 200, the odor enters the lower spray zone 200, effectively improving spraying efficiency and extending the residence time of the odor in the pretreatment zone 100. Because the demisting zone 400 collects water with a high ozone content and few impurities, it can serve as an auxiliary primary deodorization zone. After passing through the lower spray zone 200, the odor evenly enters the spray zone 300. Due to the downward sinking of the mist droplets, the odor diffuses upwards, forming a counter-current with the mist droplets. The ozone water generated by the ozone water generator 3031 is atomized into liquid particles under high pressure by the sprayer 301, which are evenly distributed throughout the spray zone 300, ensuring full contact with the odor and oxidizing and degrading the odorous substances in the odor. Simultaneously, the liquid particles adhere to dust particles in the odor, significantly increasing the weight of the dust agglomerates, thus aiding in dust removal and reducing the dust content in the odor. The obliquely arranged air ducts in the spray zone 300 slow down the diffusion rate of the odor and prolong the reaction time between the ozone water droplets and the odor. The ozone water droplets carry the odor into the demisting zone 400. After the droplets collide with the demisting plate 402, the velocity of the gas flow decreases, and the droplets form a liquid film on the surface of the demisting plate 402 under gravity. Subsequent droplets, upon contact with the liquid film, are adsorbed and condense into larger droplets. When the droplets are large enough, they flow downwards along the demisting plate 402 under gravity, thus achieving gas-liquid separation. Spray water and mist water are collected by gravity in the collection tank 500, and the collected water in the demisting zone 400 enters the ozone water collection tank 600. Ozone water droplets continuously react with odorous substances in the collection tank 500, achieving preliminary self-cleaning of the wastewater. The supernatant in the collection tank 500 flows into the sedimentation tank 700 through the upper opening of the collection tank 500, where sediment is removed. Through the spray pump 202, the supernatant in the sedimentation tank 700 and the water in the ozone water collection tank 600 enter the spray zone 200, achieving water circulation. If the ozone water collection tank 600 does not collect sufficient water and the supernatant in the sedimentation tank 700 does not promptly meet the water quality and quantity requirements of the sprayer 201, the spray pump 202 will draw water from the clean water tank 203 to achieve spraying.

[0059] In another possible embodiment, considering that the amount of ozone water collected in the ozone water collection tank 600 in the demisting zone 400 is relatively small, such as Figure 1 and Figure 2As shown, the ozone water collection tank 600 is designed in the upper left corner of the spray area 300. The ozone water collection tank 600 is about ten meters above the ground. The lower end of the ozone water collection tank 600 can be directly connected to the sprayer 201 located below the spray area 200 through the first valve 601. The sprayer 201 located below the spray area 200 and the sprayer 201 located above the spray area 201 are blocked by the second valve 602. When a certain amount of ozone water is collected in the ozone water collection tank 600, the first valve 601 is opened and the second valve 602 is closed. The ozone water in the ozone water collection tank 600 can be directly discharged through the pipe using the liquid level height difference (i.e., potential energy difference). The water is sprayed from the spray zone 200. At the sprayer 201 (i.e., the nozzle), the water suddenly narrows, and the water pressure is converted into velocity, thus creating a spraying effect. In this way, the spray pump 202 only needs to obtain water from the clean water tank 203 or the sedimentation tank 700 to achieve the spraying effect. The ozone water collected in the ozone water collection tank 600 is directly connected to the sprayer 201 below through the pipe to achieve the spraying effect. This way, the ozone water in the ozone water collection tank 600 does not need to be powered by the spray pump 202, thus achieving an energy-saving effect. At the same time, the spray pump 202 only needs to draw water from the clean water tank 203 or the sedimentation tank 700, which also simplifies the control logic of the spray pump 202.

[0060] In this embodiment, a fan 101 introduces the odor from the pig farm into the pretreatment zone 100. A dust-proof cloth 102 filters and evenly distributes the odor, removing particulate impurities and reducing the risk of clogging of the sprayers 201 and atomizers 301. The evenly distributed odor then enters the spray zone 200 for cooling, humidification, and dust removal, while absorbing water-soluble odor components. Subsequently, the odor enters the spray zone 300, where ozone water is atomized and sprayed out using atomizers 301. This ensures full contact with the odor, allowing ozone molecules to directly react with the odor molecules in an oxidation-reduction reaction, thus achieving high efficiency and thorough treatment. The system achieves excellent deodorization and recycles water from the spray zone 200 and the mist zone 300 into the same collection tank 500. The residual ozone in the mist water can continue to react in the collection tank 500, achieving initial self-cleaning of the wastewater in the collection tank 500. Then, the upper layer of water in the collection tank 500 flows to the sedimentation tank 700. After sedimentation and stabilization, the upper layer of water in the sedimentation tank 700 supplies the spray pump 202, realizing the recycling of wastewater. In addition, the deodorization process only consumes water, electricity and ozone, and achieves water recycling. There is no need to use chemical agents and physical fillers, which effectively reduces the deodorization cost.

[0061] Example 2

[0062] like Figure 9 As shown, Embodiment 2 of this application relates to a method for deodorizing a pig farm, which includes the deodorization system described in Embodiment 1. The deodorization method includes:

[0063] S100. Start the fan 101 to extract the odor from the farm building and send it to the pretreatment area 100. Control the fan 101 to work intermittently according to the farming situation. Use the dustproof cloth and air net 102 to filter out particulate matter in the odor to avoid the particulate matter in the odor from clogging the sprayer 201 in the spray area 200.

[0064] S200: Start the spray pump 202 to spray the odorous gas entering the spray zone 200 using the sprayer 201, thereby cooling, humidifying, and removing dust from the odorous gas, and simultaneously absorbing water-soluble malodorous components (such as ammonia, hydrogen sulfide, etc.) in the odorous gas. The priority for the spray pump 202 to obtain water is the ozone water collection tank 600, the sedimentation tank 700, and the clean water tank 203. That is, if the collection volume in the ozone water collection tank 600 reaches a preset value, the valve connected to the ozone water collection tank 600 will be opened first to supply water from the ozone water collection tank 600 to the spray pump 202 until the water in the ozone water collection tank 600 is used up. The collection volume in the ozone water collection tank 600 is monitored by a water level sensor, and the preset value... The water level can be within a specified range. If the collected volume in the ozone water collection tank 600 does not reach the preset value, or if the water in the ozone water collection tank 600 is used up, and the sedimentation tank 700 has settled for a sufficient time, allowing the supernatant in the sedimentation tank 700 to reach the preset requirements, then the valve connecting to the upper layer of the sedimentation tank 700 will be opened first to supply the supernatant from the sedimentation tank 700 to the spray pump 202 until the supernatant in the sedimentation tank 700 is used up. If the collected volume in the ozone water collection tank 600 does not reach the preset value, or if the water in the ozone water collection tank 600 is used up, and the supernatant in the sedimentation tank 700 has not settled to the preset requirements, i.e., the supernatant in the sedimentation tank 700 cannot be used for spraying, then the valve connecting to the clean water tank 203 will be opened to supply the supernatant from the sedimentation tank 700 to the spray pump 202. Water from the purified water tank 203 is supplied to the spray pump 202. To automate valve switching, all valves between the spray pump 202 and the purified water tank 203, the ozone water collection tank 600, and the sedimentation tank 700 are electrically controlled. A water quality detector is installed near the drain outlet on the upper layer of the sedimentation tank 700 to monitor the turbidity of the water. When the turbidity falls below a preset level, the sedimentation tank 700 is considered to have settled for a sufficient time and met the requirements for spray water. All electrically controlled valves, water level sensors, and the water quality detector are connected to the same controller, enabling automatic switching of the electrically controlled valves. Specifically, when the water level detected by the water level sensor is higher than a preset level... Once the water level reaches the preset level, the valve connecting to the ozone water collection tank 600 will automatically open, and the valve connecting to the purified water tank 203 and the sedimentation tank 700 will automatically close, using the ozone water collection tank 600 to supply water to the spray pump 202. If the water level sensor detects a liquid level lower than the preset level, and the water quality analyzer detects a water turbidity lower than the preset turbidity, the valve connecting to the sedimentation tank 700 will automatically open, and the valve connecting to the purified water tank 203 and the ozone water collection tank 600 will automatically close. If the water level sensor detects a liquid level lower than the preset level, and the water quality analyzer detects a water turbidity higher than the preset turbidity, the valve connecting to the purified water tank 203 will automatically open, and the valve connecting to the sedimentation tank 700 and the ozone water collection tank 600 will automatically close.

[0065] In another embodiment, two spray pumps 202 can be installed. One spray pump 202 draws water from the upper layer of the sedimentation tank 700 or the clean water tank 203 to spray the upper part of the spray zone 200. Since the air inlet grille 104 is located at the top, the odor enters the spray zone 200 from the top. The spray pump 202 mainly functions to cool, humidify, remove dust, and absorb water-soluble malodorous components in the incoming odor. The other spray pump... Pump 202 draws water from ozone water collection tank 600 to spray the lower half of spray zone 200. The odor in the lower half of spray zone 200 has already undergone preliminary dust removal and other treatments. Since ozone will remain in the water in ozone water collection tank 600, the residual ozone can be used to perform preliminary purification of the odor. If the water in ozone water collection tank 600 is insufficient or used up, water will be drawn from the upper layer of sedimentation tank 700 or clean water tank 203.

[0066] S300, start the spray pump 302 and use the sprayer 301 to atomize the ozone water and bring it into contact with the odor, so as to use ozone to directly and indirectly oxidize the malodorous substances in the odor. That is, after the exhaust gas passes through the pretreatment zone 100, it enters the spray zone 300. The spray zone 300 uses water that is ozone water with a certain concentration produced by the ozone water generator. Spray valves are installed on each spray pipe to control the number of sprayers 301 that are turned on. The sprayers 301 can be selectively turned on according to the odor concentration or air volume.

[0067] S400: Before the odor enters the defogging zone 400, the odor concentration is detected. Based on the odor concentration, the power of the spray pump 302, the number of operating sprayers 301, and the concentration of ozone water in the ozone water source 303 are controlled. The power of the spray pump 302, the number of operating sprayers 301, and the concentration of ozone water in the ozone water source 303 are positively correlated with the ozone concentration. Specifically, if the odor concentration exceeds the specified limit (>500 dimensionless), the high-level ozone water generator 3031 is activated to produce high-concentration ozone water and / or the spray volume is increased. If the odor concentration is within the limit, the low-level ozone generator is activated to produce low-concentration ozone water and / or the spray volume is reduced. The ozone water generated by the ozone water generator 3031 enters the ozone water tank 3032 for storage, and the liquid phase ozone concentration is detected a second time. If the liquid phase ozone concentration is too low, the corresponding parameters of the ozone water generator are adjusted to increase the ozone water concentration.

[0068] S500: After the odor passes through the physical demister 401, the concentration of the discharged odor is detected. Based on the discharged odor concentration, the power of the spray pump 302, the number of working sprayers 301, and the concentration of ozone water in the ozone water source 303 are adjusted. Specifically, if the discharged ozone concentration is too high or does not meet the preset concentration requirement, the power of the spray pump 302, the number of working sprayers 301, and the concentration of ozone water are increased to improve the deodorization effect and reduce the discharged odor concentration.

[0069] S600. Monitor the water collection rate in the ozone water collection tank 600, and adjust the angle of the demister plate 402 of the physical demister 401 according to the water collection rate. Specifically, after the odor is sprayed, it enters the demister zone 400. Start the physical demister 401 and set the initial angle of the demister plate 402. If the demister water volume is insufficient, adjust the angle of the demister plate 402 so that the collected liquid flows into the ozone water collection tank 600.

[0070] S700: Detect the natural wind direction at the output end of the defogging zone 400, and adjust the air outlet direction of the physical demister 401 according to the natural wind direction so that the air outlet direction of the physical demister 401 is opposite to the natural wind direction. The air outlet direction of the demister is adjusted by the coordinated operation of the first servo motor 412 and the fourth servo motor 415. That is, the first servo motor 412 can drive the second frame 405 to rotate to adjust the air outlet direction, and the fourth servo motor 415 can adjust the tilt angle of the upper defogging plate 406 to adjust the air outlet direction. The ultimate goal is to make the air outlet direction of the physical defogging zone 400 opposite to the outside natural wind direction. In this way, the wind countercurrent can greatly shorten the diffusion distance of water mist and reduce the impact of water mist on the surrounding environment.

[0071] In addition, the upper layer of the water collection tank 500 is connected to the lower layer of the sedimentation tank 700, while the lower layer is separated. This allows the clearer water from the upper layer of the water collection tank 500 to flow into the sedimentation tank 700, where it is then supplied to the spray area 200 after sedimentation. Multiple vertical filters 701 are installed inside the sedimentation tank 700 to reduce the water flow velocity and improve the clarity of the effluent, thus preventing clogging of the sprayers 201. Both the sedimentation tank 700 and the water collection tank 500 have external discharge outlets at their bottoms. If the amount of sludge or COD is detected to be too high, the external discharge valves are opened to process the sludge and / or water.

[0072] The deodorization method for pig farms described in this embodiment was tested in a pig farm. The specific process conditions and test results are shown in Table 1 below:

[0073] Experiment description: With the demister plate at 90 degrees as the initial condition, and without considering the use of circulating water, the initial escape rate under different air volumes was tested.

[0074] Initial water intake: Only water from the clean water tank 203 and the ozone water tank 3032 is used for water intake; circulating water from the sedimentation tank and the ozone water collection tank is not used.

[0075] Initial collected water volume: the sum of the collected volumes in the water collection tank 500 and the ozone water collection tank 600;

[0076] Initial escape volume: Initial inflow volume minus initial collected volume;

[0077] Initial escape rate: Initial escape volume / Initial inflow volume;

[0078] Collection efficiency: Ozone water collection tank volume / initial escape volume.

[0079] Calculations show that the initial escape rate is between 10% and 15% (the escape rate increases with increasing air volume).

[0080] Experiment 1

[0081] At an air volume of 80,000 m³ 3 / h, initial inflow rate 15 m³ 3 At / h, the angles of the upper, middle, and lower demisters were changed (the angles were based on the horizontal direction), and the water volume of the ozone water collection tank was measured. The results are shown in Table 1, which are used to determine the collection efficiency of the demister. At this air volume, the initial escape rate is about 11%.

[0082] Table 1: Water Quantity Results of Ozone Water Collection Pool

[0083]

[0084] Measurements have shown that the angle of the demister plate has a significant impact on water collection. By adjusting the angle of the demister plate, water collection can be achieved with a maximum efficiency of over 95%.

[0085] Experiment 2

[0086] With an air volume of 80,000~120,000 m³ 3 / h, initial influent flow rate 15 m³ 3 At / h, the angles of the upper, middle and lower demisters were changed, and the water volume of the ozone water circulation collection tank was measured as shown in Table 2. The collection efficiency of the demister was determined. Under this air volume, the initial escape rate was about 11%-15%.

[0087] Table 2: Water volume in ozone water circulation collection tank under different air volumes

[0088]

[0089] Measurements show that airflow has a significant impact on water collection. Demisters can be matched with different demister plate angles according to different airflow to maintain high water collection efficiency.

[0090] It should be noted that other specific implementation methods of the pig farm deodorization method in this embodiment can be found in the specific implementation methods of the pig farm deodorization system described above. To avoid redundancy, they will not be repeated here.

[0091] The above are merely preferred embodiments of this application; however, the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A deodorization system for pig farms, characterized in that, The system comprises a pretreatment zone, a spray zone, a misting zone, and a demisting zone connected in sequence. The pretreatment zone has multiple intermittently operating fans positioned along the airflow direction at its air inlet. A dust-blocking cloth is installed between the pretreatment zone and the spray zone. The spray zone contains multiple sprayers, each connected to a spray pump. The misting zone also contains multiple sprayers, each connected to a mist pump. The input of the mist pump is connected to an ozone water source. The demisting zone is equipped with a physical demister with an adjustable demisting plate angle. The bottoms of both the spray zone and the misting zone are connected to a water collection tank. The upper layer of the water collection tank is connected to a sedimentation tank. The demisting zone has a water collection trough for collecting ozone water, which is connected to an ozone water collection pool. The input of the spray pump can selectively draw water from a clean water tank, a sedimentation tank, and an ozone water collection pool.

2. The deodorization system for pig farms according to claim 1, characterized in that, The air intake and spray water in the spray zone move in opposite directions.

3. The deodorization system for pig farms according to claim 2, characterized in that, A partition is provided between the pretreatment zone and the spraying zone, and an air intake grille is provided at the upper end of the partition.

4. The deodorization system for pig farms according to any one of claims 1-3, characterized in that, The air duct of the spray area is set at an angle, and the spray area is divided into several sub-spaces along the air duct. Each sub-space is equipped with multiple sprayers, and the sprayers in each sub-space are controlled by the same spray valve.

5. The deodorization system for pig farms according to claim 4, characterized in that, The ozone water source includes an ozone water generating device and an ozone water tank. The output end of the ozone water generating device is connected to the ozone water tank through a water pipe, and the input end of the spray pump is connected to the ozone water tank.

6. The deodorization system for pig farms according to any one of claims 1, 2, 3, and 5, characterized in that, The physical demister includes a first frame, the inner bottom surface of which is connected to a rotatable second frame via bearings. The upper end of the second frame is connected to the shaft of a first servo motor. Multiple demister plates are installed within the second frame, each comprising an upper demister plate, a middle demister plate, and a lower demister plate. Both ends of each of the upper, middle, and lower demister plates are axially connected to the second frame via connecting shafts. Each of the upper, middle, and lower demister plates has a notch in its middle section, and a fixed shaft is fixed within each notch. A sprocket is fixedly fitted onto the outer wall of each fixed shaft. The sprocket in the middle of the lower demister plate is connected to a sprocket fitted onto the outer wall of the second servo motor shaft via a chain. The sprocket in the middle of the middle demister plate is connected to a sprocket fitted onto the outer wall of the third servo motor shaft via a chain. The sprocket in the middle of the upper demister plate is connected to a sprocket fitted onto the outer wall of the fourth servo motor shaft via a chain.

7. The deodorization system for pig farms according to claim 6, characterized in that, The bottom ends of the upper, middle, and lower demisters are all equipped with water collection tanks for collecting ozone water, and the water collection tanks are all connected to the ozone water collection pool.

8. The deodorization system for pig farms according to claim 1, characterized in that, The sedimentation tank is equipped with multiple vertically arranged filter screens. Both the sedimentation tank and the water collection tank have sewage outlets at their bottom ends, and each sewage outlet is equipped with a sewage valve.

9. The deodorization system for pig farms according to claim 1, characterized in that, All sprayers are equipped with a motor that drives the spray head to rotate.

10. A method for deodorizing a pig farm, characterized in that, The deodorization system includes any one of claims 1-9, and the deodorization method includes: Start the fan to send the odor into the pretreatment area, and use the dust filter cloth and air screen to remove particulate matter from the odor; The spray pump is started to spray the odor with the sprayer. The priority of the water source for the spray pump is ozone water collection tank, sedimentation tank and clean water tank. The spray pump is started to atomize ozone water and bring it into contact with the odor, so that the ozone can directly and indirectly oxidize the malodorous substances in the odor. The odor concentration is detected before the odor enters the defogging zone. The power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone source are controlled according to the odor concentration. The power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone source are positively correlated with the ozone concentration. After the odor passes through the physical demister, the concentration of the emitted odor is detected. Based on the emitted odor concentration, the power of the spray pump, the number of working sprayers, and the concentration of ozone water in the ozone water source are adjusted. The water collection rate in the ozone water collection tank is monitored, and the angle of the demister plate of the physical demister is adjusted according to the water collection rate. The natural wind direction at the output end of the defogging zone is detected, and the air outlet direction of the physical defogging device is adjusted according to the natural wind direction so that the air outlet direction of the physical defogging device is opposite to the natural wind direction.

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