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Industrial waste gas treatment equipment

Release time：2021-04-02 Views：1207



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1. Sources and hazards of exhaust gas
A large amount of toxic and harmful gases are generated in the production process of chemical plants, which are divided into organic waste gas and inorganic waste gas. There are many types of chemical waste gas pollution, the physical and chemical properties are very complex, and the toxicity is different; the toxic substances in chemical waste gas are divided into: acid-base waste gas, organic waste gas or a mixture of the two!
     
The peculiar smell of chemical waste gas is very harmful to the human body. It not only causes great pollution to the surrounding environment, but also causes great harm to the health of the employees of the chemical plant and the surrounding residents.


2. Categories and exhaust gas components
(1) Sulfur-containing compounds, such as hydrogen sulfide, mercaptans, dimethyl sulfide, thioethers and sulfur-containing heterocyclic compounds, etc.;

(2) Nitrogen-containing compounds, such as ammonia, amines, nitriles, nitro compounds and nitrogen-containing heterocyclic compounds, etc.;

(3) Carbon, hydrogen or compounds composed of carbon, hydrogen, and oxygen (lower alcohols, aldehydes, fatty acids, etc.).

Among the eight malodorous substances that have a greater impact on the human body are: hydrogen sulfide, ammonia, trimethylamine, methyl mercaptan, methyl sulfide, carbon disulfide, styrene, and dimethyl disulfide. The foul gas we usually refer to refers to the gas with foul smell diffused in the air.

Third, the characteristics of exhaust gas   
 1. There are more flammable and explosive gases .
       Such as low-boiling ketones, aldehydes, easily polymerized unsaturated hydrocarbons, etc., large amounts of flammable and explosive gases, if appropriate measures are not taken, are likely to cause fire and explosion accidents, which are extremely harmful.
 
 2. Most of the emissions are irritating or corrosive.
       Gases such as sulfur dioxide, nitrogen oxides, chlorine, hydrogen fluoride, etc. are all irritating or corrosive. Sulfur dioxide emissions are particularly large. Sulfur dioxide gas directly damages human health, corrodes the surfaces of metals, buildings and sculptures, and is easily oxidized into sulfates. Landed on the ground, polluting soil, forests, rivers, and lakes.

 3. There are many types of floating particles in the exhaust gas, which are harmful.

       The floating particles excluded from chemical production include dust, flue gas, acid mist, etc., and there are many kinds of them, which are more harmful to the environment. Especially when the floating particles and harmful gases exist at the same time, it can produce a synergistic effect, and the harm to people is more serious.

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Fourth, the treatment process introduction

Shenzhen Evergrande Xingye Environmental Protection Technology Co., Ltd. is a kind of waste gas treatment technology applied to the chemical industry, and the main promotion is that the chemical industry waste gas treatment process is RTO


The typical chemical waste gas treatment process adopts the combined process of "multi-stage wet scrubbing + regenerative thermal oxidation (RTO) + multi-stage wet scrubbing" to carry out complete and advanced treatment of chemical waste gas.


The VOCs waste gas from the chemical workshop is first introduced by the front fan to the first two-stage washing tower to remove inorganic waste gas, inorganic salts and a small amount of water-soluble organic waste gas, and then through the demister device to remove the water brought in by the washing tower to avoid equipment corrosion and reduce moisture Entering the RTO vaporization takes away a lot of heat in the furnace.


In addition to VOCs, the exhaust gas also carries a small amount of acidic inorganic exhaust gas. At the same time as the thermal oxidation of RTO, or with the production of secondary pollutants such as hydrogen chloride and nitrogen oxides, water scrubbing towers and caustic scrubbing towers must be added to further treat the RTO exhaust tail gas. In order to reduce the RTO exhaust temperature to meet the requirements of PP/FRP spray tower connection, a heat exchanger is installed at the RTO exhaust outlet to cool down.


Advantages of waste gas treatment process

1. The PLC programmable control used in this system. The system is mainly composed of adjustment objects (furnace temperature), detection elements (temperature measuring instruments), regulators and actuators. The control cabinet is equipped with human-machine interface (HMI) equipment for on-site operation prompts, fault alarms, operating parameter display, control parameter setting and equipment control.

The 10-inch color man-machine interface selected by the touch screen is equipped with corresponding indicator lights and control buttons as an auxiliary. The touch screen displays the process, valve position, fan status, burner status, temperature curve, etc.

2. Visual PLC control interface, manage intelligent all-in-one machine. High purification efficiency, flexible start and stop, low operating cost, convenient installation and use, fast delivery service, space saving, equipment processing efficiency >99%.

3. The exhaust gas real-time IoT intelligent monitoring platform, which provides end customers with equipment operation full life cycle tracking, fast, professional, and reliable operation and after-sales service.

4. There are many engineering cases in the national chemical industry, which can be used as reference for customers;



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