CN220444634U - Contaminated soil direct thermal desorption optimizing device - Google Patents
Contaminated soil direct thermal desorption optimizing device Download PDFInfo
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- CN220444634U CN220444634U CN202321930538.3U CN202321930538U CN220444634U CN 220444634 U CN220444634 U CN 220444634U CN 202321930538 U CN202321930538 U CN 202321930538U CN 220444634 U CN220444634 U CN 220444634U
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Abstract
The direct thermal desorption optimizing device for the polluted soil at least comprises a rotary kiln, a pair of cyclone dust collectors connected in parallel, a secondary combustion chamber, a first quenching tower, a second quenching tower, a bag-type dust collector and a spray tower; the top inlet of the first quenching tower is communicated with the secondary combustion outlet through a pipeline, and the high-temperature tail gas from the secondary combustion chamber is cooled for the first time; the bottom side surface of the second quenching tower is communicated with the bottom side surface of the first quenching tower, so that the tail gas after the first cooling enters the second quenching tower for the second cooling; the inlet of the bag-type dust collector is communicated with the outlet at the top of the second quenching tower through a pipeline, so that the tail gas subjected to the second cooling is subjected to dust removal in the bag-type dust collector. The process has the advantages of low investment cost, convenient installation, shortened installation period and significantly reduced later operation and maintenance cost due to simpler spray tower structure.
Description
Technical Field
The utility model relates to the field of treatment and restoration of polluted soil, in particular to a direct thermal desorption optimizing device for polluted soil.
Background
The polluted soil is pretreated (the grain diameter is less than or equal to 50mm and the water content is less than or equal to 20%) by sieving, crushing, dewatering and the like, is sent into a rotary kiln of a thermal desorption unit by a quantitative feeding unit according to a set feeding speed, is directly contacted with flame generated by a burner of the rotary kiln, and is uniformly heated to a temperature higher than the volatilization and gasification temperature of target pollutants, so that the purpose of separating the pollutants from the soil is achieved. The tail gas enriched with gasified pollutants firstly passes through a cyclone dust collector to remove part of dust and large particles; then burning to 850 ℃ or above through a secondary combustion chamber; then the tail gas is cooled by a heat exchanger and a quenching tower in sequence, then is dedusted by a bag-type dust remover, and finally is discharged through a chimney after being deacidified by a deacidification tower to remove pollutants. And spraying water to cool the high-temperature soil subjected to thermal desorption treatment by the rotary kiln through a discharging cooling unit, and then conveying the high-temperature soil to a designated place for stacking.
In the existing thermal desorption process flow of the polluted soil, the problems of high energy consumption, complex process and the like exist, and the process flow can be further optimized, so that the energy consumption is effectively reduced, and the emission standard of tail gas can be met.
Disclosure of Invention
In order to solve the problems, the utility model provides a direct thermal desorption optimizing device for polluted soil, which comprises the following specific technical scheme:
the utility model provides a contaminated soil direct thermal desorption optimizing apparatus, includes rotary kiln, cyclone and two fires room, still includes:
an inlet at the top of the first quenching tower is communicated with an outlet of the secondary combustion chamber through a pipeline;
the bottom side surface of the second quenching tower is communicated with the bottom side surface of the first quenching tower;
the inlet of the bag-type dust collector is communicated with the outlet at the top of the second quenching tower through a pipeline; and
the spray tower is communicated with the outlet of the bag-type dust collector through an induced draft fan, and one or more groups of circulating sprayers extending into the spray tower are arranged on the spray tower;
the first quenching tower and the second quenching tower are uniformly provided with a plurality of groups of spray guns extending to the inside of the first quenching tower and the second quenching tower, and the outer ends of the spray guns are connected with a pressurized water source.
Further, the spray gun is arranged at the middle upper parts of the first quenching tower and the second quenching tower, and the inner ends of the spray gun are provided with downward spray heads.
Further, the spray gun is provided with a pipe diameter which enables the temperature of the tail gas at the outlet of the second quenching tower to be not higher than 220 ℃.
Further, the circulation sprayers are provided with two groups.
Further, the circulating sprayer comprises a spray pump and a spray pipe connected to an outlet of the spray pump, the spray pipe extends to the inside of the spray tower, and a plurality of downward spray heads are uniformly arranged on the spray pipe in the spray tower.
Further, outlets of the two spray pumps are connected to a spray main pipe, and the two spray pipes are communicated with the spray main pipe.
Further, a control valve is installed on the spray pipe.
The beneficial effects are that:
the process has the advantages of low investment cost, convenient installation, shortened installation period and significantly reduced later operation and maintenance cost due to simpler spray tower structure.
Drawings
FIG. 1 is a flow chart of a prior art process for direct thermal desorption treatment of contaminated soil.
Fig. 2 is a flow chart of the direct thermal desorption treatment process of the polluted soil after optimization in the utility model.
In the figure: the device comprises a rotary kiln 1, a cyclone dust collector 2, a secondary combustion chamber 3, a heat exchanger 4, a quenching tower 5, a spray gun 6, a bag dust collector 7, a combustion-supporting fan 8, a deacidification tower 9, a spraying system 10, a demister 11, a back flushing system 12 and an alkali liquor supply pipe 13; 14 first quench tower, 15 second quench tower, 16 spray tower, 17 shower pipe, 18 spray main pipe, 19 spray pump, 20 shower head.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
As shown in fig. 1, the prior process flow chart for directly thermally desorbing the polluted soil comprises at least a rotary kiln 1, a pair of cyclone dust collectors 2 connected in parallel, a secondary combustion chamber 3, a heat exchanger 4, a quenching tower 5, a bag-type dust collector 7 and a deacidification tower 9.
The inlet of the rotary kiln 1 is connected with a feeding screw conveyor, and the feeding screw conveyor is provided with a feeding hopper for feeding; the rotary kiln 1 is provided with a soil discharge hole at the bottom side far away from the inlet, the discharge hole is connected with a cooling unit, and the desorbed soil is cooled; the upper side of the rotary kiln 1 is provided with a tail gas outlet, and the discharged tail gas enters the cyclone dust collector 2.
The specific technical process is as follows:
the polluted soil is pretreated by sieving, crushing, dewatering and the like (the grain diameter is less than or equal to 50mm, the water content is less than or equal to 20%) and then is fed into a feeding screw conveyor according to a set speed by a metering pump, and is conveyed into a rotary kiln 1 by the feeding screw conveyor, the polluted soil is directly contacted with flame generated by a burner arranged in the rotary kiln 1 and is uniformly heated to a temperature higher than the volatilizing and gasifying temperature of target pollutants, so that the purpose of separating the pollutants from the soil is achieved. And spraying water to cool the high-temperature soil subjected to thermal desorption treatment by the rotary kiln 1 through a discharging cooling unit, and then conveying the high-temperature soil to a designated place for stacking.
Tail gas enriched with gasified pollutants in the rotary kiln 1 enters a cyclone dust collector 2 to remove part of dust and large particles; and then the tail gas from the secondary combustion chamber 3 is subjected to high-temperature incineration to 850 ℃ or above by using a burner, the temperature of the tail gas from the secondary combustion chamber 3 is reduced by a heat exchanger 4 and a quenching tower 5 in sequence, the tail gas enters a bag-type dust remover 7 for dust removal, finally the tail gas enters a deacidification tower 9 for acid removal, and the tail gas is discharged through a chimney after reaching the standard after target pollutants are removed.
The secondary combustion chamber 3 and the rotary kiln 1 are both provided with a combustion-supporting fan 8, and a wind source generated by the combustion-supporting fan 8 is used as a cold source of the heat exchanger 4 to exchange heat with high-temperature tail gas flowing through the heat exchanger 4, so that a hot wind source with higher temperature is formed to enter the combustor for combustion assistance.
The deacidification tower 9 is communicated with the outlet of the bag-type dust remover 7 through a draught fan, so that tail gas smoothly enters the deacidification tower 9; three groups of spraying systems 10 are arranged at the middle upper part of the deacidification tower 9, wherein two groups of spraying systems are used and one group of spraying systems are reserved, and a demister 11 is also arranged above the spraying systems 10 in the deacidification tower 9, so that a back flushing system 12 for flushing the demister 11 is arranged in the top of the deacidification tower 9 to ensure that qualified tail gas can be smoothly discharged from the top of the deacidification tower 9; meanwhile, an alkali liquor supply pipe 13 is also arranged at the lower part of the deacidification tower 9 and is used for neutralizing acid liquor.
The method is an existing direct thermal desorption process for polluted soil, and after optimization, a plurality of sets of equipment are reduced, so that investment cost is reduced. The specific process flow is as follows:
as shown in figure 2, the direct thermal desorption optimizing device for the polluted soil comprises at least a rotary kiln 1, a pair of cyclone dust collectors 2 connected in parallel, a secondary combustion chamber 3, a first quenching tower 14, a second quenching tower 15, a bag dust collector 7 and a spray tower 16. Wherein:
the top inlet of the first quenching tower 14 is communicated with the outlet of the secondary combustion chamber 3 through a pipeline, and the high-temperature tail gas coming out of the secondary combustion chamber 3 is cooled for the first time.
The bottom side of the second quenching tower 15 is communicated with the bottom side of the first quenching tower 14, so that the tail gas after the first cooling enters the second quenching tower 15 for the second cooling.
The inlet of the bag-type dust collector 7 is communicated with the outlet at the top of the second quenching tower 15 through a pipeline, so that the tail gas subjected to the second cooling is subjected to dust removal in the bag-type dust collector 7.
The inlet of the spray tower 16 is communicated with the outlet of the bag-type dust collector 7 through an induced draft fan, one or more groups of circulating sprayers extending into the spray tower 16 are arranged on the spray tower 16, the circulating sprayers are used for spraying and cooling high-temperature tail gas entering the spray tower 16, so that acid gas in the tail gas is dissolved in water to form acid liquor, the rest tail gas is discharged from a chimney at the top of the spray tower 16, and the discharged tail gas reaches a qualified standard.
In the figure, a plurality of groups of spray guns 6 extending into the first quenching tower 14 and the second quenching tower 15 are uniformly distributed on the first quenching tower and the second quenching tower, and the outer ends of the spray guns 6 are connected with a water source with pressure.
Preferably, the spray gun 6 is installed at the middle upper part of the first quenching tower 14 and the second quenching tower 15, and the inner ends thereof are provided with downward spray heads.
Wherein the tail gas is burnt to 850 ℃ or above in the secondary combustion chamber 3 at high temperature, and the high-temperature tail gas from the secondary combustion chamber 3 is quenched to 220 ℃ or below in the first quenching tower 14 and the second quenching tower 15 by utilizing water flow sprayed by the spray gun 6.
Therefore, the water spray amount formed by the pipe diameters of the spray guns 6 may satisfy the requirement of the rapid cooling, and the spray guns 6 of different groups may be arranged according to the composition, the throughput, and the like of the exhaust gas.
The water flow sprayed by the spray gun 6 is used for quenching the high-temperature tail gas, and meanwhile, part of water-soluble acid gas in the high-temperature tail gas is dissolved in sprayed liquid water, is gathered at the bottoms of the first quenching tower 14 and the second quenching tower 15 and can be discharged from a sewage outlet arranged at the bottom.
In the figure, the two groups of circulating sprayers are arranged, and the two groups of circulating sprayers are one by one.
In one embodiment, the circulation sprayer comprises a spray pump 19 and a spray pipe 17 connected to an outlet thereof, the spray pipe 17 extends to the inside of the spray tower 16, and a plurality of downward spray heads 20 are uniformly installed on the spray pipe 17 located in the spray tower 16.
Preferably, outlets of the two spray pumps 19 are connected to a main spray pipe 18, and the two spray pipes 17 are communicated with the main spray pipe 18.
Wherein, the spray pipe 17 is provided with a control valve, so that the application of the two groups of spray heads 20 can be controlled respectively.
It should be noted that, in the present application, the disposal modes of the rotary kiln 1, the cyclone dust collector 2, the secondary combustion chamber 3, the bag-type dust collector 7 and the spray tower 16 after the bottom materials are discharged are all consistent with the equipment in the prior art.
Compared with the existing process flow, the optimized direct thermal desorption process of the polluted soil reduces the heat exchanger 4 and two combustion-supporting fans 8, and is provided with a first quenching tower 14 and a second quenching tower 15 with the same specification, so that the process is more convenient to install; only one group of circulating sprayers is needed to be used in the spray tower 16, the demister 11 and the back flushing system 12 are not needed to be arranged in the tower, and the alkali liquor replenishing pipe 13 is not needed to be arranged because the acid gas can be dissolved in water, so that one spray pump, two back flushing water pumps, a back flushing water tank, two alkali liquor pumps and an alkali liquor water tank are reduced. Therefore, the process of the present application has the advantages of low investment cost, significantly shortened installation period, and reduced post-operation maintenance costs due to simpler structure of the spray tower 16.
In terms of the process principle, in the existing process flow, only one quenching tower 5 is configured, and the two groups of spraying systems 10 are required to be simultaneously started in the deacidification tower 9 due to the moisture content in the tail gas, so that more water mist is generated in the deacidification tower 9, the demister 11 is required to be configured to enable the tail gas to be smoothly discharged from the top of the deacidification tower 9, and a back flushing system 12 is further required to be configured to flush the demister 11, so that the normal operation of the demister 11 is ensured.
In the process flow, as the first quenching tower 14 and the second quenching tower 15 are arranged, the spray guns 6 are arranged in the two quenching towers 5, and compared with the original heat exchanger 3 and the quenching tower 4, more acid gas dissolved in sprayed liquid water is in high-temperature tail gas, so that only one group of circulating sprayers is needed to be used for dissolving the acid gas in the tail gas in water, and the emission standard of the tail gas is reached; therefore, the water mist formed in the spray tower 16 is obviously less than that in the deacidification tower 9 of the original two groups of spray systems 10, so that the tail gas in the spray tower 16 is not blocked from being discharged from the top of the tower, and the demister 11 and the backwashing system 12 are not required to be arranged.
It should be noted that, in the process flow of the present application, in the project of repairing polluted land parcels in a certain chemical plant, the process has passed the operation and inspection of production, and the present process has the advantages of reliability, practicality, stability, etc.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a contaminated soil direct thermal desorption optimizing apparatus, includes rotary kiln, cyclone and two fires room, its characterized in that still includes:
an inlet at the top of the first quenching tower is communicated with an outlet of the secondary combustion chamber through a pipeline;
the bottom side surface of the second quenching tower is communicated with the bottom side surface of the first quenching tower;
the inlet of the bag-type dust collector is communicated with the outlet at the top of the second quenching tower through a pipeline; and
the spray tower is communicated with the outlet of the bag-type dust collector through an induced draft fan, and one or more groups of circulating sprayers extending into the spray tower are arranged on the spray tower;
the first quenching tower and the second quenching tower are uniformly provided with a plurality of groups of spray guns extending to the inside of the first quenching tower and the second quenching tower, and the outer ends of the spray guns are connected with a pressurized water source.
2. The direct thermal desorption optimizing device for contaminated soil according to claim 1, wherein the spray gun is installed at the middle upper part of the first quenching tower and the second quenching tower, and the inner end thereof is provided with a downward spray head.
3. The direct thermal desorption optimizing apparatus for contaminated soil according to claim 2, wherein said spray gun is provided with a pipe diameter such that the temperature of the tail gas of the outlet of the second quenching tower is not higher than 220 ℃.
4. The direct thermal desorption optimizing device for contaminated soil according to claim 1, wherein said circulation sprayers are provided with two groups.
5. The direct thermal desorption optimizing device for contaminated soil according to claim 4, wherein the circulating spray device comprises a spray pump and a spray pipe connected to an outlet thereof, the spray pipe extends to the inside of the spray tower, and a plurality of downward spray heads are uniformly installed on the spray pipe positioned in the spray tower.
6. The direct thermal desorption optimizing device for contaminated soil according to claim 5, wherein outlets of two spray pumps are connected to a main spray pipe, and two spray pipes are communicated with the main spray pipe.
7. The direct thermal desorption optimizing device for contaminated soil according to claim 6, wherein the spray pipe is provided with a control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321930538.3U CN220444634U (en) | 2023-07-20 | 2023-07-20 | Contaminated soil direct thermal desorption optimizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321930538.3U CN220444634U (en) | 2023-07-20 | 2023-07-20 | Contaminated soil direct thermal desorption optimizing device |
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| Publication Number | Publication Date |
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| CN220444634U true CN220444634U (en) | 2024-02-06 |
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| CN202321930538.3U Active CN220444634U (en) | 2023-07-20 | 2023-07-20 | Contaminated soil direct thermal desorption optimizing device |
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2023
- 2023-07-20 CN CN202321930538.3U patent/CN220444634U/en active Active
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