Bottom-air-return waste gas purifying ventilation hood and control method thereof

Abstract

The invention provides a bottom-air-return waste gas purifying ventilation hood. The bottom-air-return waste gas purifying ventilation hood comprises a cabinet body and a spraying generation apparatus and waste water treatment system, wherein the spraying generation apparatus and waste water treatment system comprises a water tank and a water supply pipeline, the water tank is connected to the water supply pipeline by virtue of a water pump, and the water supply pipeline is connected with a spray nozzle; the spray generation apparatus and waste water treatment system also comprises a dosing tank, the dosing tank is connected to the water tank, and a detection head of a chemical concentration detector is disposed inside the water tank. The bottom-air-return waste gas purifying ventilation hood is provided with the dosing tank, the dosing tank is connected to the water tank, an appropriate amount of chemicals is added into water of the water tank to form a solution capable of treating organic or inorganic gas, dust or particles, then the solution is sprayed onto generated waste gas by virtue of the water supply pipeline and the spray nozzle so as to absorb harmful gases, so that the generated waste water can reach an emission standard. The invention also provides a control system of the ventilation hood, which can realize functions such as purification, washing, maintenance prompting and the like.

Description

technical field [0001] The invention belongs to the field of waste gas treatment, and in particular relates to a down-return type waste gas purification fume hood and a control method thereof. Background technique [0002] A fume hood is usually provided in the laboratory to exhaust the exhaust gas of the laboratory. In order to prevent laboratory workers from inhaling or ingesting some toxic, pathogenic or unknown toxic chemicals and organisms, the laboratory should have good ventilation. Contaminants such as steam, harmful gases and particles must be removed by means of fume hoods, fume hoods or local ventilation. Existing fume hoods are usually designed as an upper exhaust type. The air flow enters the fume hood through the bottom of the adjustable door and the table top, and directly goes up through the upper, middle, and lower exhaust outlets and enters the air collection hood on the top of the fume hood into the exhaust duct. . [0003] Under the condition of consta...

AI Technical Summary

Problems solved by technology

However, the above technical solution has the following technical problems: the gas or particles generated in some experiments cannot be degraded by water, resulting in the need for secondary treatment of wastewater

Images