Animal building waste gas dust falling and deodorizing system

Abstract

The utility model discloses a livestock and poultry house waste gas dust falling and deodorizing system which comprises a flow guide bent pipeline matched with an exhaust fan, a spraying system, a dust grading and collecting system, a breeding waste gas component concentration monitoring system, a spraying control system and other facilities. According to the system, the fan-shaped spraying system arranged at the front end of the air pipe can be used for absorbing soluble substances in the breeding waste gas, and meanwhile, high-density micro-particle-size water drop particles are used for carrying out secondary condensation on particulate matters such as dust and microbial aerosol in the breeding waste gas so as to form particulate matters with larger particle diameters and heavier mass; a breeding waste gas component concentration monitoring system and a spraying control system at the tail end of the equipment can adaptively feed back and adjust the particle size of fog drops and neutralize the chemical component concentration of breeding waste, and then particulate matter is classified and collected through a variable-curvature bent air pipe device, so that the purpose of efficiently treating the livestock waste gas at low cost is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of animal husbandry waste gas treatment, in particular to a waste gas dust reduction and deodorization system for livestock and poultry houses. Background Art

[0002] The waste gas emission problem caused by large-scale and intensive animal husbandry is an important factor restricting the environmentally friendly development of animal husbandry. The main environmental pollutants in aquaculture waste gas include odor (ammonia, hydrogen sulfide, volatile organic compounds, etc.) and dust (feed, hair, microbial aerosols, etc.). Therefore, precise and efficient waste gas odor reduction and particulate dust reduction can significantly reduce the pollution of aquaculture waste gas to the environment and its adverse effects on the outside world (especially around the farms).

[0003] The exhaust system of traditional closed breeding houses does not carry out certain emission reduction and dust reduction treatment for breeding waste gas; a small number of breeding farms only treat breeding waste gas with water washing, which consumes a lot of water, and lacks targeted dust reduction treatment and subsequent graded recovery. In view of the waste of water resources in the waste gas absorption link and the difficulty in grading airborne particulate matter, a new and efficient breeding exhaust odor reduction, dust reduction and graded recovery system is designed. Utility Model Content

[0004] The purpose of the utility model is to provide a waste gas dust reduction and deodorization system for livestock and poultry houses to solve the problems existing in the above-mentioned prior art. The system can utilize a fan-shaped spray system built into the front end of the air duct to absorb and treat soluble substances in the aquaculture waste gas, and at the same time utilize high-density micro-particle water droplets to secondary condense particulate matter such as dust and microbial aerosols in the aquaculture waste gas to form particulate matter with larger particle diameter and heavier mass. The aquaculture waste gas component concentration monitoring system and spray control system at the end of the equipment can adaptively feedback and adjust the particle size of the droplets and the concentration of chemical components used to neutralize the aquaculture waste. Afterwards, the particulate matter is graded and collected through a curved air duct device with a variable curvature to achieve efficient and low-cost treatment of livestock waste gas.

[0005] To achieve the above purpose, the utility model provides the following solution: The utility model provides a waste gas dust reduction and deodorization system for livestock and poultry houses, comprising:

[0006] A guide curved pipe is installed at the exhaust fan outlet on the outer wall of the livestock and poultry house. The guide curved pipe includes a guide air duct and a curved air duct connected in sequence. The guide air duct is arranged obliquely downward, and the curved air duct is arranged upward in a curved shape. A groove is arranged at the bottom of the guide air duct.

[0007] A spray system, wherein the guide air duct is provided with the spray system, and the spray system comprises a plurality of atomizing nozzles spaced apart along the axial direction of the guide air duct, and the atomizing nozzles are connected to a water supply device through a pipeline;

[0008] A dust classification collection system is provided at the curved air duct, the dust classification collection system comprises a dust outlet and a dust outlet baffle, dust outlets are opened at different heights of the ventilation duct of the curved air duct, and a dust outlet baffle is provided at each of the dust outlets;

[0009] Aquaculture waste gas component concentration monitoring system, the aquaculture waste gas component concentration monitoring system comprises a gas component concentration sensor installed above the end of the horizontal section of the diversion curved pipeline;

[0010] A spray control system is used to control the start-up quantity, spray flow rate and spray droplet particle size of the atomizing nozzle.

[0011] Preferably, a scraper is provided in the groove, and a baffle is installed at the end of the groove, and the scraper is used to regularly scrape out the solid dust inside the spray working section pipeline; the baffle can be opened or closed.

[0012] Preferably, the number of the atomizing nozzles is three, and the three atomizing nozzles are evenly spaced along the axial direction of the air guide duct; the three atomizing nozzles are all installed in the upper semicircle of the inner wall of the air guide duct.

[0013] Preferably, in the radial direction of the guide air duct, the middle atomizing nozzle is arranged vertically downward, and the angle between the atomizing nozzles on both sides and the middle atomizing nozzle is 45°.

[0014] Preferably, the curvature radius of the curved air duct is designed according to the dust type of the target livestock and poultry breeding factory.

[0015] Preferably, the dust outlet is opened at different curvatures of the curved pipe according to the movement trajectories of different particles.

[0016] Preferably, the motion trajectories of different particles are calculated as follows:

[0017] The particle gravity is ignored, the mass is m, the air resistance is negligible, and the coordinate system is established with the center of the horizontal section at the end of the horizontal section of the diversion curved pipe as the circle point, the horizontal direction as the x-axis, and the vertical direction as the y-axis; the equation of the air flow field in the grading system is f(x, y), the equation of the particle motion trajectory is g(x), and the force of the air on the particle at any position is F, and the initial velocity of the particle is horizontal v0;

[0018] The horizontal force on the particle is:

[0019]

[0020] The vertical force on the particle is:

[0021]

[0022] When the particle moves horizontally to position x, the horizontal component velocity is v x , the vertical velocity is v y , using the kinetic energy theorem, we can get the following equation:

[0023]

[0024]

[0025] Combining the above two equations, we can get:

[0026]

[0027] Since any position v y With v x The ratio of is the slope of the particle motion equation, so:

[0028]

[0029] Integrating the above equation gives the equation for the particle motion trajectory:

[0030]

[0031] Compared with the prior art, the utility model has achieved the following beneficial technical effects:

[0032] The waste gas dust reduction and deodorization system of the livestock and poultry house in the utility model contains a specially designed spray system, which can produce a water curtain with a wider coverage, smaller water droplet size and a larger number perpendicular to the air supply direction of the fan. Compared with the previous method of directly sprinkling water over a large area to treat soluble substances, it saves more water resources and has a higher dissolution and absorption efficiency. It is combined with an automatic control system to control the waste gas composition within an ideal range.

[0033] The utility model innovatively proposes a method for the graded recovery of water-insoluble solid particles in indoor livestock exhaust gas, innovatively utilizes the material properties of solid particles, takes physical parameters such as particle size and mass as indicators, designs the curved parts and openings of the ventilation ducts along a specific curvature, and extracts the solid particles in the exhaust gas through graded recovery, thereby reducing the problem of solid particle deposition, improving waste recovery efficiency, and providing an environmentally friendly and efficient treatment method for indoor livestock breeding exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is the overall layout diagram of the waste gas dust reduction and deodorization system of livestock and poultry houses;

[0036] Figure 2 This is the internal schematic diagram of the waste gas dust reduction and deodorization system of the livestock and poultry house;

[0037] Figure 3 This is the distribution diagram of the plastic spraying system;

[0038] Figure 4 This is the automatic control flow chart of the spray control system;

[0039] Among them, 1. exhaust fan; 2. spray system; 31. scraper; 32. baffle; 4. groove; 5. gas component concentration sensor; 6. curved air duct; 7. dust baffle. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The purpose of the utility model is to provide a waste gas dust reduction and deodorization system for livestock and poultry houses to solve the problems existing in the above-mentioned prior art. The system can utilize a fan-shaped spray system built into the front end of the air duct to absorb and treat soluble substances in the aquaculture waste gas, and at the same time utilize high-density micro-particle water droplets to secondary condense particulate matter such as dust and microbial aerosols in the aquaculture waste gas to form particulate matter with larger particle diameter and heavier mass. The aquaculture waste gas component concentration monitoring system and spray control system at the end of the equipment can adaptively feedback and adjust the particle size of the droplets and the concentration of chemical components used to neutralize the aquaculture waste. Afterwards, the particulate matter is graded and collected through a curved air duct device with a variable curvature to achieve efficient and low-cost treatment of livestock waste gas.

[0042] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figure 1-Figure 4As shown, the utility model provides a waste gas dust reduction and deodorization system for livestock and poultry houses, comprising:

[0044] A guide curved pipe is installed at the outlet of the exhaust fan 1 on the outer wall of the livestock and poultry house. The guide curved pipe includes a guide air duct and a curved air duct 6 connected in sequence. The guide air duct is arranged obliquely downward, and the curved air duct 6 is arranged upward in a curved shape. A groove 4 is arranged at the bottom of the guide air duct.

[0045] A spray system 2 is provided in the guide air duct, and the spray system 2 comprises a plurality of atomizing nozzles spaced apart along the axial direction of the guide air duct, and the atomizing nozzles are connected to the water supply device through a pipeline;

[0046] The dust classification collection system is provided at the curved air duct 6. The dust classification collection system includes a dust outlet and a dust outlet baffle 7. The ventilation duct of the curved air duct 6 has dust outlets at different heights. Each dust outlet is provided with a dust outlet baffle 7. The air duct is curved. According to the centrifugal force difference of dust of different weights at a certain speed, the corresponding curvature radius is designed to realize dust classification collection.

[0047] Aquaculture waste gas component concentration monitoring system, the aquaculture waste gas component concentration monitoring system comprises a gas component concentration sensor 5 installed above the end of the horizontal section of the diversion curved pipe;

[0048] Spray control system: The spray control system is used to control the start-up number of atomizing nozzles, spray flow rate and spray droplet size.

[0049] The outer wall of the livestock and poultry house is equipped with an exhaust fan 1, which can extract the exhaust gas generated in the room and accelerate the gas circulation. The subsequent systems are installed in a guide air duct matching the exhaust fan 1. The guide air duct is tilted downward at a certain angle, and a groove 4 is provided at the bottom for solid-liquid separation and efficient collection of water droplets formed on the pipe wall after spraying.

[0050] In one embodiment, the spray system 2 contains three specially designed atomizing nozzles, which are arranged at a certain distance in the axial direction and staggered and symmetrically distributed in the cross-sectional angle. The angle between the nozzles on both sides and the middle nozzle is 45°, which can eventually produce a water curtain with moderate thickness, larger coverage and perpendicular to the air supply direction of the fan. The water droplets produced by this spray system 2 are small in size and large in density. While absorbing soluble gases, the surface tension of the water-gas interface is increased due to the increase in the overall water surface area, so that more tiny airborne solid particles are gathered together to form particles with larger particle sizes; the spray system 2 is also equipped with a water circulation system, a scraper 31 and a groove 4. The scraper 31 is used to regularly scrape out the solid dust inside the spray working section pipeline; the groove 4 is used for solid-liquid separation, so as to achieve efficient collection of water droplets formed on the pipeline wall after spraying.

[0051] In one embodiment, the aquaculture waste gas component concentration monitoring system includes a gas component concentration sensor 5 installed above the end of the horizontal section of the diversion curved pipe. The gas component sensor mainly integrates monitoring sensors of gases such as ammonia and hydrogen sulfide to monitor the chemical composition of the gas after spray treatment in real time.

[0052] In one embodiment, the spray control system uses the PID control method to control the spray flow rate and the concentration and composition of the chemical substances in the spray liquid used to remove aquaculture waste gas. The PID control method has the characteristics of fast response, stability, and precision. In this system, if it is detected that the content of a certain aquaculture waste gas component exceeds the standard, the control system will specifically adjust the number of sprayer startups, the spray flow rate, the spray droplet particle size and its chemical composition. Increasing the number of sprayer startups can directly increase the number of droplets and thus promote the effective reduction of aquaculture waste gas. The size of the spray droplet particle size is controlled by the nozzle flow rate. The smaller the droplet particle size, the more effective the chemical components in the droplets used to neutralize aquaculture waste gas can be, and the higher the emission reduction efficiency. In addition, the targeted adjustment of the chemical composition of the spray liquid according to the terminal gas composition and concentration can improve the precise reduction of excessive aquaculture waste gas.

[0053] Step 5: The dust classification collection system is composed of an upward curved variable curvature curved air duct 6, with small openings at different heights of the ventilation duct for collecting dust. The curvature radius of the air duct is designed according to the dust characteristics of the target livestock and poultry farm. According to the difference in centrifugal force of dust of different weights at a certain speed, the corresponding curvature radius is designed to achieve dust classification collection.

[0054] Working principle of dust classification collection system: The solid dust treated by spray system 2 mainly includes PM2.5, PM10, feathers produced by indoor livestock, feed, microbial aerosols, etc. The different physical parameters such as particle size, mass and density will lead to different movement paths.

[0055] Large particles: refers to solid dust with large mass and density visible to the naked eye, such as gathered hair balls, feed particles, etc. The gravity effect on them cannot be ignored during the flight process after being blown out by the fan. In the horizontal direction, they are similar to falling motion. Before reaching the end of the ventilation duct, they will fall directly and remain at the bottom of the duct. The scraper 31 set on the lower wall of the duct will regularly scrape away the accumulated objects and discharge them through the opening at the bottom.

[0056] Small particles:

[0057] 1. Small particles refer to solid dust with small mass and density, such as feathers, PM2.5, PM10, microbial aerosols, etc. After being blown out by the fan, gravity has little effect on its movement trajectory, and it can be roughly regarded as moving in the horizontal direction. When moving to the bend, the solid particles will first follow the direction of the airflow to perform circular motion (the ventilation duct is curved, and the airflow direction at the bend is also similar to the direction of the ventilation duct). Assume that the gravity of such solid particles is negligible, and the mass is m. Since the particles are small, the influence of air resistance can be ignored. The center of the cross section of the duct is about to bend is the center point, the horizontal direction is the x-axis, and the vertical direction is the y-axis to establish a coordinate system. Assume that the equation of the air flow field in the classification system is f(x,y), the particle motion equation is g(x), and the force of the air on the particles at any position is F, and the initial velocity of the particles is horizontal v0.

[0058] The horizontal force on the particle is:

[0059]

[0060] The vertical force on the particle is:

[0061]

[0062] Suppose that when the horizontal component velocity moves to the x position, it is vx, and the vertical component velocity is vy. Using the kinetic energy theorem, the equation is as follows:

[0063]

[0064]

[0065] Combining the above two equations, we can get:

[0066]

[0067] Since the ratio of vy to vx at any position is the slope of the particle motion equation, we can thus:

[0068]

[0069] Integrating the above equation yields the particle motion equation:

[0070]

[0071] From the equation of motion, it can be found that the trajectory of particle motion is affected by mass. The larger the mass of the particle, the smaller the curvature of its motion curve and the smoother the trajectory.

[0072] The movement trajectories of different particles can be obtained from the above quantitative analysis. Combined with actual test measurement and verification, the curvature of the ventilation duct can be designed according to certain parameters, and openings can be set at appropriate positions to allow solid particles of different quality grades (particles with similar quality and similar movement trajectories are of the same grade) to fly out from different openings, thereby achieving the purpose of graded recovery.

[0073] Combination Figure 1-Figure 3 As shown, the exhaust fan 1 and the guide curved pipe matched with the fan can extract indoor gas and promote air circulation. The subsequent systems are all loaded in the guide curved pipe. The front section of the guide air duct is tilted downward at an angle of 5° with the horizontal line to facilitate drainage. The spray system 2 includes a specially designed fan-shaped nozzle, and the system is connected to a water circulation system, a flow rate and component adjustment system (not shown in the figure); a scraper 31 and a bottom baffle 32 are set in the groove 4. The preset installation position of the gas concentration monitor (the specific equipment is not shown in the figure), the monitoring data is fed back to control the spray system 2 after the decision is made by the embedded expert system.

[0074] The dust classification collection system includes a curved air duct 6 with a specially designed curvature and multiple outlets (the specific number and location should be analyzed based on the actual breeding environment). The dust outlet and dust baffle 7 can catch flying objects. The system is equipped with an external water supply device (not shown) connected to the spray system 2.

[0075] Three atomizing nozzles are installed on the top of the air guide duct. The middle nozzle is installed vertically. The nozzles on both sides are separated from the middle nozzle by a distance in the axial direction of the pipe and staggered with the middle nozzle at a 45° angle in the radial direction. The specific positions are shown in the schematic diagram. The high-pressure water flow is transported to the atomizing nozzle and accelerated through the small holes of the nozzle to form tiny water droplets. The small holes of the nozzle are specially designed to ensure that the sprayed water mist is fan-shaped. The fan-shaped spray profile is shown in the figure. The actual volume of the fan-shaped nozzle is small and will not block the airflow.

[0076] The working process of the waste gas dust reduction and deodorization system of livestock and poultry houses:

[0077] (1) Exhaust fan 1 starts to absorb the waste gas generated in the room. The waste gas mainly includes water-soluble gases such as carbon dioxide, hydrogen sulfide, ammonia, and some tiny solid particles that are insoluble in water.

[0078] (2) The spray system 2 starts working, and the water supply system provides water to spray a water curtain with appropriate thickness and wider coverage perpendicular to the air supply direction of the fan to absorb water-soluble substances in the waste and condense solid particles. At the same time, gravity is used to drain water through the groove 4 at the bottom and the downward inclination angle of the air duct.

[0079] (3) The aquaculture waste gas component concentration monitoring system and spray control system start working, analyze the composition and concentration of the discharged gas, and perform feedback control on the number of sprayers started, the spray flow rate, and the composition and concentration of the chemical substances used to neutralize the aquaculture waste gas.

[0080] (4) The scraper 31 is used to periodically scrape away the solid dust remaining at the bottom of the air duct toward the baffle 32. When the scraper 31 moves to the baffle 32, the baffle 32 is opened and the solid dust is discharged. Then the scraper 31 returns to its original position and the baffle 32 is closed, waiting for the next time the scraper 31 works before opening again.

[0081] (5) The dust classification and collection system can screen and classify the solid particles according to their quality.

[0082] (6) The entire system is installed in a ventilation duct connected to the fan, and the grading system at the end is also based on the ventilation duct by changing the curvature and adding openings.

[0083] Figure 4 Automatic control flow chart of spray control system

[0084] (1) It is detected that the content of a certain gas exceeds the standard.

[0085] (2) The PID automatic control system makes regulatory decisions, increases the number of spray devices that are turned on, increases the spray concentration, and adjusts the spray chemical composition to promote the absorption of the excessive gas. At the same time, it controls the content within the ideal range to ensure the lowest equipment energy consumption.

[0086] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0087] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system for dust reduction and deodorization of waste gas from livestock and poultry houses, characterized by: include: A guide curved pipe is installed at the exhaust fan outlet on the outer wall of the livestock and poultry house. The guide curved pipe includes a guide air duct and a curved air duct connected in sequence. The guide air duct is arranged obliquely downward, and the curved air duct is arranged upward in a curved shape. A groove is arranged at the bottom of the guide air duct. A spray system, wherein the guide air duct is provided with the spray system, and the spray system comprises a plurality of atomizing nozzles spaced apart along the axial direction of the guide air duct, and the atomizing nozzles are connected to a water supply device through a pipeline; A dust classification collection system is provided at the curved air duct, the dust classification collection system comprises a dust outlet and a dust outlet baffle, dust outlets are opened at different heights of the ventilation duct of the curved air duct, and a dust outlet baffle is provided at each of the dust outlets; Aquaculture waste gas component concentration monitoring system, the aquaculture waste gas component concentration monitoring system comprises a gas component concentration sensor installed above the end of the horizontal section of the diversion curved pipeline; A spray control system is used to control the start-up quantity, spray flow rate and spray droplet particle size of the atomizing nozzle.

2. The waste gas dust reduction and deodorization system for livestock and poultry houses according to claim 1 is characterized by: A scraper is arranged in the groove, and a baffle is installed at the end of the groove. The scraper is used to regularly scrape out the solid dust inside the spray working section pipeline; the baffle can be opened or closed.

3. The waste gas dust reduction and deodorization system for livestock and poultry houses according to claim 1 is characterized by: The number of the atomizing nozzles is three, and the three atomizing nozzles are evenly spaced along the axial direction of the air guide duct; the three atomizing nozzles are all installed on the upper semicircle of the inner wall of the air guide duct.

4. The waste gas dust reduction and deodorization system for livestock and poultry houses according to claim 3 is characterized by: In the radial direction of the guide air duct, the middle atomizing nozzle is vertically arranged downward, and the angle between the atomizing nozzles on both sides and the middle atomizing nozzle is 45°.

5. The waste gas dust reduction and deodorization system for livestock and poultry houses according to claim 1 is characterized by: The curvature radius of the curved air duct is designed according to the dust type of the target livestock and poultry breeding factory.

6. The waste gas dust reduction and deodorization system for livestock and poultry houses according to claim 1 is characterized by: According to the movement trajectories of different particles, the dust outlet is opened at different bending curvatures of the curved pipe.

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