CN219756384U - Tail gas recycling system - Google Patents
Tail gas recycling system Download PDFInfo
- Publication number
- CN219756384U CN219756384U CN202321202487.2U CN202321202487U CN219756384U CN 219756384 U CN219756384 U CN 219756384U CN 202321202487 U CN202321202487 U CN 202321202487U CN 219756384 U CN219756384 U CN 219756384U
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- CN
- China
- Prior art keywords
- tail gas
- fan
- burner
- rotary kiln
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004064 recycling Methods 0.000 title abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 238000011084 recovery Methods 0.000 claims 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 43
- 239000002689 soil Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 10
- 239000000428 dust Substances 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 238000005067 remediation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 73
- 239000002912 waste gas Substances 0.000 description 8
- 238000003795 desorption Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model belongs to the technical field of polluted soil remediation, and particularly provides a tail gas recycling system which comprises a fan, a combustor and a rotary kiln; the burner is arranged at the kiln head of the rotary kiln; the air inlet of the fan is connected with the tail gas outlet of the polluted soil pretreatment system, and the air outlet of the fan is connected with the air inlet of the burner. The system for recycling the tail gas of the polluted soil pretreatment provided by the utility model utilizes the fan to extract the tail gas generated in the soil pretreatment workshop, and the tail gas is used as combustion-supporting air of a burner of a rotary kiln and is blown into the rotary kiln for combustion, so that the tail gas is recycled. The tail gas treatment process does not need a bag-type dust collector, an activated carbon device and an exhaust drum, saves equipment and activated carbon purchasing cost and installation cost, eliminates secondary pollution caused by replacing activated carbon, and avoids the treatment cost of dangerous waste activated carbon.
Description
Technical Field
The utility model belongs to the technical field of polluted soil remediation, and particularly relates to a tail gas recycling system, in particular to a polluted soil thermal desorption pretreatment tail gas recycling system.
Background
Because the physicochemical properties of the polluted soil have a certain influence on the thermal desorption treatment process and the result, in addition, the requirements of high efficiency and low energy consumption are considered, and the polluted soil needs to be pretreated before entering a rotary kiln for burning. The polluted soil is pretreated by sieving, crushing, dewatering and the like, so that the water content is ensured to be less than 20%, and the grain diameter is ensured to be less than or equal to 50mm. The reaction area and the mixing degree of the polluted soil are increased, so that higher desorption efficiency is achieved. Waste gas generated in the pretreatment process of the polluted soil is required to enter waste gas treatment equipment for treatment and then is discharged after reaching standards.
Taking a waste gas treatment system of a No. 2 thermal desorption pretreatment workshop of the No. 1 polluted soil in a C land block soil pollution restoration project in a south area of a Yuan Ge store chemical plant as an example, the total air quantity is 11000m 3 And/h, 2 air suction ports are arranged in total, and the polluted soil thermal desorption pretreatment tail gas treatment system is shown in figure 1. The dust-containing waste gas of the polluted soil pretreatment system 12 flows into the bag-type dust remover 13 from two tail gas outlets 11, is adsorbed by the activated carbon device 14, and is finally sent to the exhaust funnel 15 through the fan 9 for emission. When carrying out the pretreatment of polluted soil in the pretreatment system, soil particles escape and VOCs volatilize and enter the air to form waste gas, and the tail gas treatment system mainly collects and treats the waste gas. The bag-type dust collector 13 is mainly used for treating particulate matters in the waste gas, and the activated carbon device 14 is mainly used for adsorbing VOCs in the waste gas so as to prevent the tail gas from exceeding standard and discharging to pollute the atmosphere. The motor power of the fan 9 is 18.5KW,11000m 3 The single filling amount of the activated carbon of the tail gas treatment equipment with the ventilation rate is about 1.8t, and the activated carbon needs to be replaced every 80 days. The replaced active carbon belongs to dangerous waste products, secondary pollution is generated, qualified third party treatment is required to be entrusted, and the treatment cost is increased.
Disclosure of Invention
The utility model aims to solve the problems that the existing treatment process of the tail gas of the thermal desorption pretreatment of the polluted soil can produce secondary pollution, the cost is high and the like.
Therefore, the utility model provides a tail gas recycling system, which comprises a fan, a burner and a rotary kiln; the burner is arranged at the kiln head of the rotary kiln; the air inlet of the fan is connected with the tail gas outlet of the tail gas generating unit, and the air outlet of the fan is connected with the air inlet of the burner.
Specifically, the burner comprises a combustion cylinder; the front end of the combustion cylinder is provided with a combustion head which extends into the rotary kiln; an air pipe is arranged at the air inlet of the combustion cylinder; one end of the air pipe is connected with an air outlet of the fan.
Specifically, the burner is connected with a gas access pipe.
Specifically, the gas valve is arranged on the gas access pipe.
Specifically, the air pipe is provided with an air distribution valve.
Specifically, the lower end of the combustion head is fixedly connected with a flame detector.
Specifically, an air inlet of the fan is connected with a tail gas pipe; and one end of the tail gas pipe is connected with a tail gas outlet of the tail gas generating unit.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
the tail gas recycling system provided by the utility model utilizes the fan to extract the tail gas generated by the tail gas generating unit, and the tail gas is used as combustion-supporting air of the burner of the rotary kiln and is blown into the rotary kiln for combustion, so that the recycling of the tail gas is realized. The tail gas treatment process does not need a bag-type dust collector, an activated carbon device and an exhaust drum, saves equipment and activated carbon purchasing cost and installation cost, eliminates secondary pollution caused by replacing activated carbon, and avoids the treatment cost of dangerous waste activated carbon.
The present utility model will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a flow chart of a prior process for treating tail gas of thermal desorption pretreatment of polluted soil.
Fig. 2 is a schematic diagram of the tail gas recycling system provided by the utility model.
Reference numerals illustrate: 1. a rotary kiln; 2. a rotary kiln driving motor; 3. a combustion head; 4. a combustion cylinder; 5. a gas access pipe; 6. a gas valve; 7. an air duct; 8. an air distribution valve; 9. a blower; 10. a tail gas pipe; 11. a tail gas outlet; 12. a contaminated soil pretreatment system; 13. a bag-type dust collector; 14. an activated carbon device; 15. and an exhaust pipe.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 2, the utility model provides a tail gas recycling system, which comprises a fan 9, a burner and a rotary kiln 1; the burner is arranged at the kiln head of the rotary kiln 1; the air inlet of the fan 9 is connected with the tail gas outlet 11 of the polluted soil pretreatment system 12, and the air outlet is connected with the air inlet of the burner. Preferably, an air inlet of the fan 9 is connected with an exhaust pipe 10; one end of the tail gas pipe 10 is connected with a tail gas outlet 11 of a polluted soil pretreatment system 12. In actual use, the rotary kiln 1 is driven to run by the rotary kiln driving motor 2, meanwhile, the fan 9 is started, tail gas generated by the polluted soil pretreatment system 12 is extracted by the fan 9 and is sent into the burner to serve as combustion air of the burner of the rotary kiln 1, and the combustion air is blown into the rotary kiln 1 for combustion. The tail gas treatment process does not need a bag dust collector 13, an activated carbon device 14 and an exhaust drum 15, and directly sends the tail gas into the rotary kiln 1 for recycling, so that equipment and activated carbon purchasing cost and installation cost are saved, secondary pollution caused by replacement of activated carbon is avoided, and the treatment cost of dangerous waste activated carbon is avoided.
Specifically, the burner comprises a combustion cylinder 4; the front end of the combustion cylinder 4 is provided with a combustion head 3, and the combustion head 3 extends into the rotary kiln 1; an air pipe 7 is arranged at the air inlet of the combustion cylinder 4; one end of the air pipe 7 is connected with an air outlet of the fan 9.
Further, the burner is connected with a gas access pipe 5, gas enters the burner from the gas access pipe 5, is mixed with tail gas blown by a fan 9, and the mixed gas is ignited at a combustion head 3 and is sprayed into the rotary kiln 1.
In a refined embodiment, a gas valve 6 is arranged on the gas inlet pipe 5 for adjusting the gas quantity.
Preferably, the air pipe 7 is provided with an air distribution valve 8 for adjusting the amount of tail gas blown in by the fan 9 as combustion-supporting air of the burner of the rotary kiln 1.
In order to better adjust the combustion effect in the rotary kiln 1, the lower end of the combustion head 3 is fixedly connected with a flame detector, and the flame detector can monitor the combustion condition of the burner in the whole process and immediately react when a problem occurs.
In an optimized embodiment, the utility model provides a polluted soil pretreatment tail gas recycling system, which comprises a fan 9, a burner and a rotary kiln 1; the burner is arranged at the kiln head of the rotary kiln 1;
the burner comprises a combustion cylinder 4; the front end of the combustion cylinder 4 is provided with a combustion head 3, the combustion head 3 extends into the rotary kiln 1, and the lower end of the combustion head 3 is fixedly connected with a flame detector; an air pipe 7 is arranged at the air inlet of the combustion cylinder 4; the burner is connected with a gas access pipe 5, and a gas valve 6 is arranged on the gas access pipe 5; one end of the air pipe 7 is connected with an air outlet of the fan 9, and an air distribution valve 8 is arranged on the air pipe 7;
the air inlet of the fan 9 is connected with a tail gas pipe 10, and one end of the tail gas pipe 10 is connected with a tail gas outlet 11 of a polluted soil pretreatment system 12.
When the device is in actual use, the rotary kiln 1 is driven to operate by the rotary kiln driving motor 2, the fan 9 is started, tail gas generated by the polluted soil pretreatment system 12 is pumped out by the fan 9 through the tail gas pipe 10, the air distribution valve 8 is opened, and the tail gas is sent to the burner through the air outlet of the fan 9 and the air pipe 7. The gas valve 6 is opened, so that gas enters the burner through the gas access pipe 5 and is mixed with tail gas serving as combustion-supporting air, the mixed gas is ignited at the combustion head 3 and is sprayed into the rotary kiln 1, the flame detector can monitor the combustion condition of the burner in the whole process, and the burner reacts immediately when a problem occurs.
The gas and the tail gas are respectively regulated by the gas valve 6 and the air distribution valve 8, and after the ignition is successful, the air distribution valve 8 and the gas valve 6 are gradually and alternately regulated until the burner reaches the rated working condition or the required working condition. If the load is insufficient, the air distribution valve 8 is opened first, then the gas valve 6 is regulated, the flame condition is observed, and the heat load of the burner is gradually increased until the furnace temperature is normal and the combustion effect is good. If the load is too high, the gas valve 6 is closed first, then the air distribution valve 8 is regulated, the flame condition is observed, and the heat load of the burner is gradually reduced until the furnace temperature is normal and the combustion effect is good. Judging whether the mixing proportion of the fuel gas and the air is proper or not by observing the color of the flame, wherein the color of the fuel gas is better than bluish purple, or judging according to the combustion sound, if the air quantity is too small, the combustion sound is low; conversely, if the air amount is too large, a high sound of the break is generated.
The tail gas recycling system for the pretreatment of the polluted soil provided by the utility model utilizes the fan 9 to extract the tail gas generated by the pretreatment system 12 of the polluted soil, and the tail gas is used as combustion-supporting air of a burner of the rotary kiln 1 and is blown into the rotary kiln 1 for burning, so that the recycling of the tail gas is realized. The tail gas treatment process does not need a bag-type dust collector 13, an activated carbon device 14 and an exhaust drum 15, saves equipment and activated carbon purchasing cost and installation cost, eliminates secondary pollution caused by replacing activated carbon, and avoids the treatment cost of dangerous waste activated carbon.
The foregoing examples are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model, and all designs that are the same or similar to the present utility model are within the scope of the present utility model.
Claims (5)
1. The utility model provides a tail gas recycle system which characterized in that: comprises a fan (9), a burner and a rotary kiln (1); the burner is arranged at the kiln head of the rotary kiln (1); an air inlet of the fan (9) is connected with a tail gas outlet (11) of the tail gas generating unit, and an air outlet of the fan is connected with an air inlet of the burner; the burner comprises a combustion vessel (4); the front end of the combustion cylinder (4) is provided with a combustion head (3), and the combustion head (3) extends into the rotary kiln (1); an air pipe (7) is arranged at the air inlet of the combustion cylinder (4); one end of the air pipe (7) is connected with an air outlet of the fan (9); the burner is connected with a gas access pipe (5).
2. The exhaust gas recovery system according to claim 1, wherein: the gas inlet pipe (5) is provided with a gas valve (6).
3. The exhaust gas recovery system according to claim 1, wherein: an air distribution valve (8) is arranged on the air pipe (7).
4. The exhaust gas recovery system according to claim 1, wherein: the lower end of the combustion head (3) is fixedly connected with a flame detector.
5. The exhaust gas recovery system according to claim 1, wherein: an air inlet of the fan (9) is connected with a tail gas pipe (10); one end of the tail gas pipe (10) is connected with a tail gas outlet (11) of the tail gas generating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321202487.2U CN219756384U (en) | 2023-05-16 | 2023-05-16 | Tail gas recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321202487.2U CN219756384U (en) | 2023-05-16 | 2023-05-16 | Tail gas recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219756384U true CN219756384U (en) | 2023-09-26 |
Family
ID=88091896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321202487.2U Active CN219756384U (en) | 2023-05-16 | 2023-05-16 | Tail gas recycling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219756384U (en) |
-
2023
- 2023-05-16 CN CN202321202487.2U patent/CN219756384U/en active Active
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