Automatic control method of oxygen-temperature feedback ventilation in high-temperature aerobic composting stage

Abstract

The invention discloses an automatic control method of oxygen-temperature feedback ventilation in a high-temperature aerobic composting stage. The method comprises the following four steps of: step 1: controlling no ventilation of the compost, and continuously raising temperature till the temperature is higher than desired temperature; step 2: adjusting the ventilation quantity according to the oxygen consumption speed of the compost so as to supply enough oxygen to the compost; step 3: controlling the ventilation quantity according to the temperature of the compost, and keeping the ventilation quantity for a preset time in the desired temperature range so as to achieve effects of compost sterilization and organic degradation; and step 4: quickly dewatering the compost by adopting fixed high ventilation quantity, and cooling the compost to room temperature. According to the invention, flexible control of the ventilation quantity is realized, the compost is kept in the desired temperature range and oxygen concentration range, and the method is conductive to shortening the treatment period and maintaining an aerobic environment of the compost; and by virtue of adopting a low-ventilation continuous running strategy, the power needed by a fan device can be greatly reduced, and harmlessness and resource utilization of the compost are realized.

Description

technical field [0001] The invention belongs to the technical field of compost temperature control ventilation, and in particular relates to a fully automatic control method for segmental oxygen-temperature feedback ventilation of high-temperature aerobic compost. Background technique [0002] With the continuous increase of organic solid waste, high-temperature aerobic composting has been paid more and more attention as an effective treatment technology. During the composting process, the organic matter is decomposed and utilized by aerobic bacteria, which generates a large amount of reaction heat, which raises the temperature of the compost to a higher temperature, inactivates most of the pathogenic bacteria, and completes the stabilization of the organic matter and the reduction of the compost. Therefore, it is necessary to control the temperature and oxygen of the pile in an appropriate range, so as to maintain a suitable high temperature period, and to complete the harm...

AI Technical Summary

Problems solved by technology

Both of the above two methods have certain disadvantages. During the rapid heating period of the pile, the oxygen consumption of the pile is large, and only through temperature control is easy to cause anaerobic conditions, resulting in odor pollution.

The existing temperature control methods all adopt the mode of controlling the opening and closing of the blower. In order to ensure a good ventilation volume during the blowing cycle, the fan type is often large, and the ventilation efficiency is relatively low. A large amount of air cannot effectively remove moisture and carry Dissipate heat, the frequent turning on and off of the motor also consumes a lot of energy and affects the life of the fan

The time control method is difficult to effectively ensure the temperature of the compost body, and manual auxiliary adjustments are often required, which reduces the stability of the composting process and increases labor costs

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