Expectation of "subtractive" exhaust gas purification and environmental protection equipment

First, the seriousness of paint exhaust pollution:

Since currently used paints basically belong to benzene-based organic solvent coatings, there are obvious odors and smoke generation in the surrounding environment and workshops, such as 0.7m2 tinplate per area, coating solids content 35%, coating thickness It is 6g/m2, and the vehicle speed is calculated at 5000 pieces/hour. The amount of polluted gas emitted per hour is about 39 kg/hour, and its severity can be imagined.

Second, the historical review of the purification of waste gas:

Although there are various methods and equipments for purifying exhaust gas in history, the general trend is to go to the thermal combustion method without secondary pollution—incineration and catalytic combustion. Through the survey results of China's printing iron industry:

1. Both the exhaust gas purification and environmental protection equipment imported from Germany, Japan, and Taiwan are incineration methods. This method completely eliminates waste gas, but it consumes a large amount of energy, which is approximately between 1.1-1.2 million kcal/hour, which greatly exceeds that of the original coating iron. The total energy consumption of the room, which I call "Additional" environmental protection furnace, will not be welcomed by users at present because of the increase in production costs.

2. Domestically-manufactured equipment for environmental protection equipment adopts a thermal combustion method based on catalytic combustion as a method of combining national conditions, and cracks the molecular chain of the organic solvent in the exhaust gas through the set high temperature to form carbon dioxide and water to achieve the purpose of purification. The purified heat released is returned to the drying room for production use. If it can be achieved that the energy consumption of environmental protection equipment is less than the total energy consumption of the original coating iron drying room, then I call it "subtractive" environmental protection equipment, which is an ideal environmental protection equipment for users.

Third, choose the focus of waste gas equipment purification of environmental protection equipment:

1. Environmental protection: Appearance ---- The exhaust gas is smokeless and odorless

Standard ---- Meet the national GB 16297-1996 gas emission standards

2. Energy Saving (Utilization of Waste Heat)

The use of the purified heat can stop the use of the burner of the original painting paint drying room, and the excess heat can then be used by the dehydration drying room (or iron drying room), compared with the energy consumption of the original two drying rooms. Environmental operating costs ≤ zero.

3, quality: waste heat utilization does not affect product quality

The temperature fluctuation point of the drying room is ±3°C

4, life: catalytic combustion method - catalyst life> 2 years

Incineration method - lifetime of the furnace> 8 years

5. Cost-effectiveness: Since environmental protection equipment is not a production equipment that directly generates profits, the operating cost determines the cost-effectiveness of environmental protection stoves. If the operating cost of the energy consumption of environmental protection equipment is less than zero, the investment cost of environmental protection equipment can be recovered within a few years depending on the type of paint. .

6, security: burner, furnace body, fan, air duct switching device, etc. are controlled by PLC, GOT electrical operation.

Fourth, the "subtractive" environmental protection equipment expectations:

1. Energy-saving target: Save energy 5-10% under the same energy (oil, gas) conditions.

2. Develop new energy varieties and better purification processes to further increase energy efficiency.