Improved process for biochemical treatment method of MDF dried tail gas and treatment system

Abstract

The invention relates to an improved process for a biochemical treatment method of MDF dried tail gas and a treatment system. The improved process comprises the following steps: carrying out high-speed and high-pressure atomization spray cooling and aldehyde suction; and (2) carrying out low-speed smoke water film dust removal and aldehyde suction, wherein a moisture separation and slag condensing process is additionally set between the step (1) and the step (2) and comprises a gravity settling slag condensing process and a moisture rotary separation slag condensing process. By utilizing the moisture separation and slag condensing process, sludge and water in a preserved region can be timely exhausted and subjected to a water purification slag removal process, treated water can be circularly used in each procedure, a whole production system does not need to be halted during the slag discharging, manual cleaning is not required, and a separated clean water body can be discharged along with tail gas, so that the storage cost of the water body is lowered; and furthermore, a large amount of clean water body is taken away through the discharging of the tail gas, so that a 'white dragon' phenomenon is reduced, and the problem that a sewage treatment station needs to be built by increasing a huge investment so as to treat 'production wastewater' which is caused when 20-30 tons of condensate water is produced each hour is solved.

Description

technical field [0001] The invention relates to the field of tail gas treatment for man-made board manufacturing, in particular to an improved process and a treatment system for a biochemical treatment method for drying tail gas of medium-density man-made fiberboard (MDF). Background technique [0002] At present, the exhaust emission of the wood-based panel production line is basically self-emission, and there is no control on the exhaust gas components. Although there is also an exhaust buffer box for continuous presses, the buffer box mainly passes through the bottom partition to reduce the wind speed and deposit dust. Although this kind of buffer box can deposit some larger particles of dust, most of the dust, especially a large number of tiny dust particles, is still discharged with the exhaust gas, and the buffer box cannot handle other substances in the exhaust gas, especially the man-made substances contained in the exhaust gas. The relatively high concentration of ...

AI Technical Summary

Problems solved by technology

Therefore, the exhaust emission of the current wood-based panel production line still has high dust content, high temperature, and high formaldehyde content, which is harmful to the environment and is not conducive to environmental protection.

[0003] The company has authorized a patent "A Biochemical Treatment Method and System for Exhaust Gas" 201410265262.0, which discloses an exhaust gas treatment method and production system, which can greatly solve the problems existing in the MDF (medium density fiberboard) exhaust emission in the industry, but During the practice of putting into operation, it was found that the sludge and water separated by multi-stage spraying and dust removal were mixed together and accumulated at the bottom of the equipment, which could not be separated and treated in time. It had to be shut down every 3 to 6 months to empty the spray pipe All the roads are sprayed with water, and the mud condensed at the bottom of the equipment is manually cleaned, which leads to the following problems:

[0004] 1. Due to the large amount of water in the entire sprinkler pipeline, the discharged spray water may overflow and cause environmental accidents --- need to build a large water storage tank;

[0005] 2. Shutdown for cleaning will lead to an increase in downtime rate and labor costs;

[0006] 3. The slag cannot be separated from the water body and discharged in time, the water body is not clean enough, it is easy to block the nozzle and water film filler, increase the failure rate and the cost of replacing the filler, and increase the production cost;

[0007] 4. The water body is not clean enough, which will cause the water to ferment and stink and lead to excessive VOC;

[0008] 5. The water body is not clean enough, which will lead to an increase in the dust content in the exhaust gas after treatment

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