Sludge drying tail gas treatment system and process

A technology for exhaust gas treatment and sludge drying, applied in gas treatment, dispersed particle separation, membrane technology, etc., can solve the problem of secondary ozone pollution, and achieve the effect of short treatment route, increase contact time, and avoid secondary ozone pollution.

Active Publication Date: 2020-12-01
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AI-Extracted Technical Summary

Problems solved by technology

However, after research by the inventors, it was found that when this treatment process uses ozone to generate ...
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Method used

The present invention arranges tail gas treatment device, first carries out contact reaction with Fenton's reagent by aeration disc, then increases the contact time with Fenton's reagent by multistage orifice plate, realizes the oxidation treatment of malodorous gas, thereby avoids adding ozone resulting in secondary pollution. The invention adopts multi-stage contact Fenton reagent treatment, which can achieve the purpose of cooling. After the Fenton reagent is oxidized, ferric ions are produced, which has a flocculation effect and realizes the capture of fine particle dust. At the same time, the acid gas is mainly hydrogen sulfide The gas not only provides acidic conditions for Fenton's reagent, enhances the oxidation performance of Fenton's reagent, but also can oxidize sulfur ions to sulfate ions. The invention adds activated carbon to the Fenton's reagent, can completely treat the sludge drying tail gas, and can reach the national discharge standard without ultraviolet photolysis. The pur...
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The invention provides a sludge drying tail gas treatment system and process. The system comprises a vertically arranged tower body; a liquid storage tank and an overflow chamber are arranged at the bottom of the tower body; an overflow plate is arranged between the liquid storage tank and the overflow chamber; a plurality of pore plates are arranged above the liquid storage tank; each pore plateis provided with an overflow pipe; the lower pipe orifice of each overflow pipe is slightly higher than the pore plate below the overflow pipe; the distance from the pore plates to the upper pipe opening of the overflow pipe is 1/3-1/2 of the distance between the two pore plates; a liquid inlet is formed in the side wall of the uppermost pore plate; the lower pipe opening of the lowermost overflowpipe is slightly higher than the bottom plate of the liquid storage tank; an aeration disc is arranged on the bottom plate of the liquid storage tank; and the inlet of the aeration disc is connectedwith a sludge drying tail gas source, the liquid storage tank is provided with a solid phase inlet, the top of the tower body is provided with a gas phase outlet, the side wall of the overflow chamberis provided with a liquid outlet, the bottom of the overflow chamber is provided with a solid phase outlet, the liquid outlet is connected with the liquid inlet through a circulating pipeline, the liquid inlet is connected with a Fenton reagent pipeline, and the solid phase inlet is connected with an activated carbon source.

Application Domain

Gas treatmentDispersed particle separation

Technology Topic

Exhaust gasActivated carbon +5


  • Sludge drying tail gas treatment system and process
  • Sludge drying tail gas treatment system and process
  • Sludge drying tail gas treatment system and process


  • Experimental program(1)

Example Embodiment

[0046] Example 1
[0047] Sludge drying exhaust gas treatment systems, such as figure 1 , It includes a heat recovery unit 1, the exhaust gas processing apparatus 2, the circulation pump 3 and exhaust tube 4. Sludge drying in accordance with the flow of exhaust gas, a heat recovery unit, the exhaust gas processing device 2 and exhaust pipe 4 are connected in sequence.
[0048] Exhaust gas treatment apparatus comprising a vertical tower established, 6, 7 is provided between the overflow plate 6 provided at the bottom of the tower sump and overflow chamber 5 reservoirs 5 and the overflow chamber. Sump 5 the bottom plate 8 disposed diffusers, aeration inlet plate 8 is connected to a heat recovery tail gas outlet. Diffusers, such as figure 2 Shown, a number of concentric rings connected through the main pipe is formed, the annular wall of the tube is provided aeration holes, pointing to the top of the tower aeration holes. Aeration hole provided short pipe 18, a short pipe disposed inclined, the inclination angle of each stub coincide.
[0049] 5 is provided above the plurality of reservoirs disposed in parallel vertical plates 9, each of the plates 9 are in contact with the inner wall of the tower is connected, the orifice plate 9 image 3 Shown as a plurality of through holes provided in the plate 19. Each plate 9 is provided an overflow pipe 10 overflow pipe 10 is provided with a vertical plate 9, each of the overflow pipe 10 is slightly above the lower nozzle (hereinafter distance 5cm) below the overflow pipe plate, the upper and lower phase o disclination overflow tube 10 is provided, the side wall of the top plate a distance between two plates is 1/3 ~ 1/2 is provided on the liquid inlet port 10 of plate 9 to the distance of the overflow pipe , the bottom of the overflow pipe slightly lower nozzle (hereinafter 5cm distance) reservoir bottom plate.
[0050] Sump inlet 5 is provided a solid phase, the solid phase inlet connection 11 is connected to the conveyor solid activated charcoal tank 12, the bottom of the overflow chamber outlet 6 is provided a solid phase, the solid phase outlet at the bottom of the overflow chamber is connected with the inlet fluid reservoir. Top of the tower body disposed gas outlet, a gas phase outlet connected to exhaust pipe 4.
[0051] Overflow chamber outlet port 6 side wall, the liquid outlet and the liquid inlet 13 connected via a circulation line, the circulating pump 3 is provided on the circulation line 13, a liquid inlet line 14 is also connected Fenton, Fenton's reagent line 14 ferrous salts connection line 15, outlet line 16 is provided with a hydrogen peroxide throat structure 20 (the same structure and the constriction), the outlet throat configuration of the tangential line 15 is inserted into the ferrous salt.
[0052] The bottom of the chamber 6 from the overflow of necking down on the structure, the base structure is a necking discharge port, the discharge port is connected solid phase inlet of the fluid reservoir.
[0053] Gas outlet orifice between the top of the tower at the top of the cyclone 17 provided.
[0054] Its process as follows:
[0055] Fenton's reagent Fenton reagent into the exhaust gas treatment apparatus line, Fenton's reagent flows through the overflow pipe below the plate until the flowing liquid storage tanks, sludge drying tail gas through diffusers into the Fenton's reagent, simultaneously Fenton's reagent reservoirs of activated carbon was added, via sump aeration sludge drying process offgas multistage treatment Fenton's reagent by contacting the top plate and the orifice plate, until the outlet gas from the exhaust gas treatment apparatus through an exhaust the discharge tube, the reservoir tanks Fenton's reagent overflow chamber overflows into the overflow chamber Fenton reagent was allowed to stand after sequentially through the circulation line and the inlet port into the exhaust gas treatment apparatus.
[0056] Fenton's reagent by the ferrous sulfate solution and hydrogen peroxide in a molar ratio of ferrous ion and hydrogen peroxide is 1: 2 to 2.5.
[0057] Liquid feed ratio in the tail gas treatment unit is 1: 0.5 to 0.8.
[0058] The dried sludge treatment process off-gas emissions meet threshold requirements 2 "odor emissions standards" (GB14554-1993) table.


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Description & Claims & Application Information

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