Sludge hydrothermal carbonization waste gas deodorization system

Abstract

The utility model belongs to the field of general environmental protection, and relates to a sludge hydrothermal carbonization waste gas deodorization system which enables the waste gas to reach the emission standard and comprises an acid pickling tower, an alkaline washing tower, a chemical absorption tower, a water washing tower, a biological filter, an activated carbon adsorption tank and an exhaust funnel which are sequentially arranged and communicated through pipelines, a grid layer, a first atomizing layer, a filler layer, a second atomizing layer and a gas-mist separation layer are sequentially arranged in the pickling tower from bottom to top, pickling solution atomizing nozzles are arranged in the first atomizing layer and the second atomizing layer, an alkaline solution spraying head is arranged in the alkaline tower, a chemical absorption liquid spraying head is arranged in the chemical absorption tower, and a gas-mist separation layer is arranged in the gas-mist separation layer. A washing liquid spraying head is arranged in the water washing tower, a microbial filter material layer and an atomizing layer are arranged in the biological filter tank from bottom to top, and a filtrate spraying head is arranged in the atomizing layer.

Description

Technical Field

[0001] This utility model belongs to the general field of environmental protection and relates to a sludge hydrothermal carbonization waste gas deodorization system. Background Technology

[0002] Hydrothermal carbonization of sludge is a novel sludge treatment process that has emerged in recent years. When using this process to treat sludge, no chemical agents need to be added. Only high-temperature, high-pressure steam is introduced and the reaction is maintained under pressure. The organic flocs in the sludge are then fully decomposed, transforming into soluble substances that transfer from the solid phase to the liquid phase. This significantly improves the dewatering performance of the sludge, achieving a dryness level comparable to that of traditionally dried sludge. The sludge volume reduction rate can reach 70%, making it a very promising sludge treatment process.

[0003] The temperature of sludge hydrothermal carbonization is typically above 150℃. Under these high-temperature conditions, accompanied by the breaking and rearrangement of chemical bonds, various odor-causing substances in the sludge, including nitrogen-containing, sulfur-containing, benzene-ring-containing, and aromatic hydrocarbons, are released in large quantities, forming hydrothermal carbonization waste gas with an odor concentration (dimensionless) as high as hundreds of thousands. To promote the healthy development of sludge hydrothermal carbonization technology, the problem of achieving emission standards for high-concentration waste gas from hydrothermal carbonization processes must be solved first. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a sludge hydrothermal carbonization waste gas deodorization system, which can effectively treat the waste gas in the exhaust gas and make it meet the emission standards.

[0005] The technical solution is as follows: a sludge hydrothermal carbonization waste gas deodorization system, characterized in that it includes an acid washing tower, an alkaline washing tower, a chemical absorption tower, a water washing tower, a biological filter, an activated carbon adsorption tank, and an exhaust stack arranged sequentially and connected by pipelines. The acid washing tower is provided with a grid layer, a first atomizing layer, a packing layer, a second atomizing layer, and a gas-mist separation layer arranged sequentially from bottom to top. The first atomizing layer and the second atomizing layer are provided with acid washing liquid atomizing nozzles. The alkaline washing tower is provided with alkaline washing liquid spray nozzles. The chemical absorption tower is provided with chemical absorption liquid spray nozzles. The water washing tower is provided with water washing liquid spray nozzles. The biological filter is provided with a microbial filter material layer and an atomizing layer arranged from bottom to top. The atomizing layer is provided with filtrate spray nozzles.

[0006] A further feature is that pickling liquid is placed at the bottom of the pickling tower, and the pickling liquid is sprayed into the pickling liquid atomizing nozzle through the pickling pump. The air inlet of the pickling tower is located between the pickling liquid solution and the grid layer, and the air outlet of the pickling tower is located above the air-mist separation layer.

[0007] The bottom of the biological filter contains filtrate, which is pumped into the filtrate spray head by a filtrate pump.

[0008] The activated carbon adsorption tank is filled with powdered activated carbon.

[0009] After the waste gas passes through pickling, alkali washing, chemical absorption and water system, ammonia gas, soluble gas, acid gas and volatile gas can be washed and absorbed, and then residual components are taken out through biological adsorption and decomposition in a biological filter tank, and finally the odor is adsorbed by adsorption carbon, so that the waste gas discharged from the exhaust pipe meets the emission standard after the five-stage treatment. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a system principle diagram of the utility model;

[0011] Figure 2 It is a structure schematic diagram of the pickling tower;

[0012] Figure 3 It is a structure schematic diagram of the biological filter tank. DETAILED DESCRIPTION

[0013] As shown in Figure 1 , Figure 2 , Figure 3 A sludge hydrothermal carbonization waste gas deodorization system, which comprises a pickling tower 1, an alkali washing tower 2, a chemical absorption tower 3, a water washing tower 4, a biological filter tank 5, an activated carbon adsorption tank 6 and an exhaust pipe 7 arranged in sequence and communicated by pipelines, wherein the pickling tower 1 is sequentially provided with a grid layer 13, a first atomization layer 14, a filler layer 15, a second atomization layer 16 and a gas mist separation layer 17 from bottom to top, acid washing liquid atomizing nozzles are arranged in the first atomization layer 14 and the second atomization layer 16, an acid washing liquid 11 is placed at the bottom of the pickling tower 1, the acid washing liquid 11 is a sulfuric acid solution or a hydrochloric acid solution, the acid washing liquid 11 is sprayed through an acid washing pump 12, an air inlet of the pickling tower 1 is located between the acid washing liquid 11 and the grid layer 13, and an air outlet of the pickling tower 1 is located above the gas mist separation layer 17.

[0014] The alkali washing tower 2 is provided with an alkali washing liquid spraying head, the alkali washing liquid is a solution of potassium hydroxide or sodium hydroxide, the chemical absorption tower is provided with a chemical absorption liquid spraying head, the chemical absorption liquid is a Fenton reagent or a sodium hypochlorite solution, the water washing tower is provided with a water washing liquid spraying head, and tap water or reclaimed water is used in the water washing tower, the water washing tower functions to buffer the impact of exhaust gas from the front chemical absorption tower on microorganisms in the rear biological filter tank, the biological filter tank 5 is provided with a microorganism filter material layer 53 and an atomization layer 54 from bottom to top, the atomization layer 54 is provided with a filtrate spraying head, a filtrate 51 is placed at the bottom of the biological filter tank 5, the filtrate 51 enters the filtrate spraying head through a filtrate pump 52, and the top of the biological filter tank 5 is an air outlet; the activated carbon adsorption tank is filled with powdered activated carbon.

[0015] The hydrothermal carbonization waste gas from the bottom of the pickling tower 1 enters the pickling tower, and passes through the grid layer 13, the first atomization layer 14, the filler layer 15, the second atomization layer 16, and the gas-liquid separation layer 17 in sequence. The pickling gas such as ammonia and part of the soluble gas in the waste gas is absorbed by the pickling liquid. Then, under the action of the air blower on the pipeline, the waste gas passes through the alkaline washing tower 2, and the alkaline liquid reacts with the acidic gas (such as hydrogen sulfide) in the waste gas to reduce the concentration of the pickling gas in the waste gas. In the chemical absorption tower 3, the VOCs in the waste gas are oxidized by the Fenton reagent, the molecular bonds of the VOCs are broken, the structure is destroyed, and the concentration is reduced. The water washing tower 4 washes and absorbs the Fenton reagent gas molecules mixed in the previous waste gas.

[0016] The biological filter 5 biologically adsorbs and decomposes the residual refractory components in the waste gas. The waste gas enters the biological filter 5, passes through the microbial filter material layer 53 and the atomization layer 54, and is discharged from the top of the biological filter 5. In order to maintain a humid environment for the growth of microorganisms, the bottom of the biological filter 5 is the filter liquid 51, which circulates in the biological filter 5 under the action of the filter liquid pump 52.

[0017] The activated carbon adsorption tank 6 adsorbs the low-concentration odor in the exhaust gas from the biological filter 5. After five-stage treatment, the sludge hydrothermal carbonization waste gas is discharged from the exhaust pipe 7.

Claims

1. A sludge hydrothermal carbonization waste gas deodorization system, characterized in that, It includes an acid washing tower, an alkaline washing tower, a chemical absorption tower, a water washing tower, a biological filter, an activated carbon adsorption tank, and an exhaust stack arranged sequentially and connected by pipelines. The acid washing tower has a grid layer, a first atomizing layer, a packing layer, a second atomizing layer, and a gas-mist separation layer arranged sequentially from bottom to top. The first atomizing layer and the second atomizing layer are equipped with acid washing liquid atomizing nozzles. The alkaline washing tower is equipped with alkaline washing liquid spray nozzles. The chemical absorption tower is equipped with chemical absorption liquid spray nozzles. The water washing tower is equipped with water washing liquid spray nozzles. The biological filter has a microbial filter material layer and an atomizing layer arranged from bottom to top. The atomizing layer is equipped with filtrate spray nozzles.

2. The sludge hydrothermal carbonization waste gas deodorization system according to claim 1, characterized in that, Pickling solution is placed at the bottom of the pickling tower. The pickling solution is sprayed into the pickling solution atomizing nozzle through the pickling pump. The air inlet of the pickling tower is located between the pickling solution and the grid layer, and the air outlet of the pickling tower is located above the atomization separation layer.

3. The sludge hydrothermal carbonization waste gas deodorization system according to claim 1, characterized in that, The bottom of the biological filter contains filtrate, which is pumped into the filtrate spray head.

4. The sludge hydrothermal carbonization waste gas deodorization system according to claim 1, characterized in that, The activated carbon adsorption tank is filled with powdered activated carbon.

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