Heat treatment oil fume purifier

Various heat treatment enterprises and workshops generate a large amount of harmful smoke during the cooling, annealing, tempering, and machining processes of workpiece oil. Its main components are non methane total hydrocarbons, nitrogen oxides, alkanes, benzene, and xylene organic waste gas and smoke components from the decomposition and carbonization of oil products at high temperatures. Its characteristics are:

1. The instantaneous generation of oil fumes is strong and has a strong impact force;

1. Oil products that produce oil fumes have a low ignition point and are often accompanied by flames;

2. High oil mist temperature, high oil content, and high exhaust gas concentration;

In response to the fire hazards that heat treatment companies are concerned about, Jinkoxingye Environmental Protection's fire extinguishing technology ensures the safe and stable operation of the entire purification system.

Oil fume collection methods in the heat treatment industry

The collection of oil fumes is a prerequisite for oil fume purification treatment. A reasonable collection method can greatly reduce the requirements for the purification system's processing capacity and save equipment costs while ensuring the collection effect. However, there are various types of heat treatment equipment, and the actual production situation varies greatly, making it difficult to find a universal collection method. The collection of heat-treated oil fume often requires targeted design of collection methods and devices based on various factors such as equipment conditions, production reality, and requirements.

Heating furnace oil fume collection

For various heating devices with exhaust ports, there is no problem with collecting smoke, as long as the exhaust pipe is connected to the exhaust port.

For mesh belt furnaces, trolley furnaces, and well furnaces, in many cases, gas is not discharged from the exhaust port, but directly overflows from the furnace mouth or furnace cover. For such equipment, a reasonable smoke hood should be designed according to the specific situation of the equipment. For trolley furnaces, mesh belt furnaces, etc., a "trapezoidal" smoke hood is generally installed on the upper part of the furnace door. After the smoke overflows from the furnace mouth, it is extracted by the exhaust fan. For well type tempering furnaces, although many have exhaust ports, in actual production, the sealing of many furnace covers is not good. When the smoke is large, it overflows from the gaps around the furnace cover. To collect this type of smoke, a circular smoke hood is usually installed on the furnace cover.

Quenching tank oil fume collection

The current difficulty in collecting oil fumes from heat treatment lies in the collection of quenching oil fumes from open quenching oil tanks. During the oil quenching process of hot workpieces,

Intense combustion and evaporation occur on the surface of quenching oil, and high-temperature smoke and open flames instantly erupt upwards, forming a strong smoke. Due to the fast movement speed of quenching oil fumes and the fact that there is usually a bridge crane hanging the workpiece on the upper part of the quenching tank, it is difficult to collect quenching oil fumes.

There are currently several ways to collect quenching oil fumes:

Smoke collection can be achieved through methods such as suction on the side of the slot, placement of smoke collection on the slot, and movement of the smoke hood.

(1) Suck and collect smoke on the side of the slot. The slot side smoke collection is during quenching

Smoke exhaust ports are set around the groove and connected to smoke exhaust fans. When the workpiece enters the oil, smoke is drawn through the side exhaust port. However, due to the fast movement speed of quenching flue gas, if the quenching tank has no cover, it is difficult to extract the flue gas from the side port. To solve this problem, quenching tanks that use side suction smoke collection should generally be equipped with tank covers and increase the distance from the groove to the quenching oil surface, which should generally be greater than the height of the workpiece string. When the workpiece is quenched, it first runs above the oil level and below the groove cover. After the groove cover is closed, the workpiece enters the oil and exhausts the smoke. If the workpiece is quenched by a bridge crane suspension, there should be a bridge crane suspension rope hole in the middle of the groove cover. If the parameter design of the smoke exhaust system is reasonable, the smoke collection effect of this collection method is good. However, due to the sealing of high-temperature oil fumes and open flames in a certain space, open flames can easily cause pipeline fires along the pipeline. At the same time, if the concentration of flue gas is too high, it is also prone to secondary combustion, which can be dangerous. Therefore, fire prevention and extinguishing measures must be taken when using this coking method.

(2) Place smoke collection on the slot. For situations where a bridge crane is not required during the quenching process, if conditions permit, a top smoking hood can be installed on the upper part of the groove. This type of hood is set at the upper part of the slot, consistent with the direction of smoke movement, and has low requirements for collection capacity for the same amount of smoke. In addition, a baffle can be installed on the non operating side of the oil tank to further improve the smoke collection effect.

(3) Activity set hood. The active smoke hood is generally designed to meet the operational requirements of the bridge crane for hanging workpieces, and the traditional slot on the smoke hood is designed as an active type. Before the bridge crane hangs the workpiece in place, the smoke hood is opened, and after the bridge crane and workpiece are in place, the smoke hood is closed, and the oil smoke collection is completed at the upper part. This type of smoke hood has various forms of movement, such as rotating, folding, etc. Compared with fixed smoke hoods, it allows bridge cranes to hang workpieces and meets production requirements. Compared with side suction smoke collection, due to the high position of the hood at the oil groove, the speed of smoke movement has been greatly reduced, making it easier to collect. At the same time, at the top of the hood, the open flame has been basically extinguished, reducing the risk of fire.