CN-121970687-A - Pig house ventilation system and method

CN121970687ACN 121970687 ACN121970687 ACN 121970687ACN-121970687-A

Abstract

The invention relates to the technical field of breeding devices, in particular to a pig house ventilation system and a pig house ventilation method. The system comprises an air exchange device, an environment sensor and a control device, wherein the air exchange device comprises a purification section and a heat recovery section, the purification section is sequentially provided with an air inlet, a spray disinfection device, a spraying device and an electrostatic precipitator, the heat recovery section is provided with a heat recovery device and an air outlet, the heat recovery device is respectively connected with the air inlet and the air outlet through ventilating pipes, the purification section and the heat recovery section are respectively provided with a variable frequency fan and an electric air valve, and the control device receives information of the environment sensor and regulates and controls the operation of the variable frequency fan, the electric air valve, the spray disinfection device and the heat recovery device. The method can realize the automatic and intelligent management of the system and improve the operation efficiency and stability of the ventilation system.

Inventors

ZHONG RUQING
WANG XIAOHONG
HAO YUE
ZHANG SHU
CHEN LIANG
ZHANG HONGFU

Assignees

中国农业科学院北京畜牧兽医研究所

Dates

Publication Date: 20260505
Application Date: 20251227

Claims (10)

1. A pig house ventilation system is characterized by comprising an air exchange device, an environment sensor and a control device, The air exchange device comprises a purification section and a heat recovery section; The purification section is sequentially provided with an air inlet, a spray disinfection device, a spraying device and an electrostatic precipitator, wherein the electrostatic precipitator is transversely arranged in the purification section, and a hydrophobic coating is arranged on the surface of a dust collecting electrode of the electrostatic precipitator; the heat recovery section is provided with a heat recovery device and an air outlet, and the heat recovery device is respectively connected with the air inlet and the air outlet through ventilation pipelines; the purification section and the heat recovery section are both provided with a variable frequency fan and an electric air valve; the control device receives the environmental sensor information and is configured to send a first control signal to the variable frequency fan and the electric air valve, a second control signal to the spray disinfection device and a third control signal to the heat recovery device so as to coordinate and control the operation of the variable frequency fan, the electric air valve, the spray disinfection device and the heat recovery device.
2. The pigsty ventilation system of claim 1, wherein the purification section further comprises a differential pressure detection mechanism configured to detect a differential pressure value across the electrostatic precipitator, the control device configured to trigger activation of the spraying device when the differential pressure value exceeds a preset threshold.
3. A pig house ventilation system according to claim 1, characterized in that the pig house is further provided with a spacer means arranged in the pig house to divide the pig house into a first functional area and a second functional area, so that air flow between the first functional area and the second functional area is prevented.
4. A pig house ventilation system according to claim 1, characterized in that the heat recovery device has an inclination angle of 3 ° to 5 ° with respect to the horizontal plane, which inclination angle is formed by the gradual downward inclination of the heat recovery device from the end near the purification section to the end remote from the purification section.
5. The pigsty ventilation system of claim 1, wherein the purification section is further provided with a flow equalizing plate and a filter screen, the filter screen is arranged on the leeward side of the electrostatic precipitator, the flow equalizing plate is arranged between the electrostatic precipitator and the filter screen, and a plurality of flow guide holes are formed in the flow equalizing plate; And an ultraviolet photocatalytic decomposition unit is also arranged between the electrostatic precipitator and the filter screen.
6. The pigsty ventilation system of claim 1, wherein the environmental sensor comprises at least an ammonia concentration sensor, a hydrogen sulfide concentration sensor, a PM2.5 sensor, a carbon dioxide concentration sensor, and a temperature and humidity sensor.
7. A method for ventilating a pig house using the ventilating system as set forth in any one of claims 1 to 6, comprising the steps of: Based on the environmental parameter information received by the control device, the environmental parameters comprise NH 3 concentration, H 2 S concentration, PM2.5 concentration, CO 2 concentration and temperature difference inside and outside the pig house, and the parameters are normalized into a state vector; Selecting an optimal action a under the current state s from the action set based on a Q-learning algorithm and an epsilon-greedy strategy; Executing the selected action a, and collecting the new state s' after execution and the corresponding instant rewards r, wherein the rewards r is a weighted combination of energy consumption and air quality; Updating a state-action value function according to the Belman equation; repeating the steps until the Q value is converged, and outputting an optimal regulation strategy which minimizes energy consumption and meets the air quality threshold.
8. The pigsty ventilation method of claim 7, wherein the act a comprises: the current frequency conversion fan rotating speed is used as a reference, and the adjustment is increased or reduced within the range of 10 percent; The opening degree of the current electric air valve is taken as a reference, and the opening degree is increased or reduced within the range of 5 percent; the spray disinfection device is used for adjusting the discrete value of the spray disinfection frequency within the range of 0-5 times/hour.
9. The pigsty ventilation method of claim 7, wherein the instant prize r is calculated by the formula: ; wherein DeltaP is the energy consumption increment corresponding to the rotating speed regulating quantity of the variable frequency fan, deltaV is the energy consumption increment corresponding to the opening regulating quantity of the electric air valve, F is the spraying frequency of the spraying disinfection device, I Reaching the standard is the indication function of the standard of the pigsty environmental parameter, positive value is given when the standard is reached, negative value is not given when the standard is reached, w 1 ,w 2 is the dynamic adjustable weight coefficient, and k 1 ,k 2 ,k 3 is the equipment energy consumption coefficient.
10. The pigsty ventilation method of claim 7, wherein the normalization method comprises: Upper threshold limits are set for the NH 3 concentration, the H 2 S concentration, the PM2.5 concentration and the CO 2 concentration respectively, and normalized values are calculated through S i = (current value/threshold value); The temperature difference between the inside and the outside of the house is linearly mapped to the range of [0,1] according to the actual temperature interval.

Description

Pig house ventilation system and method Technical Field The invention relates to the technical field of breeding devices, in particular to a pig house ventilation system and a pig house ventilation method. Background With the expansion of the intensive livestock and poultry raising scale, the influence of the air quality and the temperature and humidity environment in the pig house on the health and the production benefit of the pig farm is increasingly remarkable. As is well known, the pig house has the environmental characteristics of high humidity, high ammonia, high dust, and traditional negative pressure ventilation system reduces harmful gas concentration such as ammonia (NH 3), hydrogen sulfide (H 2 S) through forced exhaust, but traditional negative pressure ventilation system' S fibre filter screen easily takes place to harden and block up in pig house environment, needs frequent change, and traditional metal electrostatic precipitator very easily takes place creepage or short circuit trouble in pig house high humidity environment, and can form the fatlute layer on its polar plate after absorbing dust and comdenstion water combine, and conventional clearance means is difficult to get rid of, influences dust removal efficiency. In addition, if the front end purification fails, the air flow containing high-concentration ammonia gas and dust directly enters the heat recovery device, so that corrosion and dust accumulation of the heat recovery device can be accelerated, and the service life of equipment is seriously shortened. Therefore, a synergistic system capable of integrating zonal ventilation, waste heat recovery, self-cleaning filtration and intelligent decision making is needed. Disclosure of Invention The invention provides a pig house ventilation system and a method, which aim to solve the technical problems that a traditional negative pressure ventilation system adopted by the existing pig house is easy to cause blockage, hardening, corrosion failure and difficult cleaning and maintenance under the high-humidity, high-ammonia and high-viscosity dust environment, and simultaneously provide an intelligent and accurate ventilation regulation and control method. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a pigsty ventilation system, which comprises an air exchange device, an environment sensor and a control device, wherein the air exchange device comprises a purification section and a heat recovery section, the purification section is sequentially provided with an air inlet, a spray disinfection device, a spraying device and an electrostatic dust collector, the electrostatic dust collector is transversely arranged in the purification section, a hydrophobic coating is arranged on the dust collecting electrode surface of the electrostatic dust collector, the spraying device is arranged on the windward side of the electrostatic dust collector and is used for spraying cleaning liquid to the dust collecting electrode, a liquid collecting tank is further arranged at the bottom of the purification section and is used for collecting sprayed waste liquid, the heat recovery section is provided with a heat recovery device and an air outlet, the heat recovery device is respectively connected with the air inlet and the air outlet through ventilation pipes, the purification section and the heat recovery section are respectively provided with a variable frequency fan and an electric air valve, and the control device is used for receiving information of the environment sensor and is used for sending a first control signal to the variable frequency fan and the electric air valve, a second control signal to the spray disinfection device and a third control signal to the heat recovery device so as to control the variable frequency fan, the electric air valve and the spray disinfection device and the heat recovery device are coordinated to operate. Further, the purifying section further comprises a differential pressure detection mechanism, the differential pressure detection mechanism is configured to detect differential pressure values of two sides of the electrostatic precipitator, and the control device is configured to trigger the spraying device to be started when the differential pressure values exceed a preset threshold value. Further, the pig house is further provided with a spacing means arranged in the pig house to divide the pig house into a first functional area and a second functional area, thereby preventing air flow between the first functional area and the second functional area. Further, the heat recovery device has an inclination angle of 3-5 degrees relative to the horizontal plane, and the inclination angle is formed by gradually inclining downwards from one end of the heat recovery device, which is close to the purifying section, to one end of the heat recovery device, which is far away from the purifying section.