CN212285287U - Device for improving thermal desorption efficiency of base pipe soil based on Hartmann whistle structure - Google Patents
Device for improving thermal desorption efficiency of base pipe soil based on Hartmann whistle structure Download PDFInfo
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- CN212285287U CN212285287U CN202020932802.7U CN202020932802U CN212285287U CN 212285287 U CN212285287 U CN 212285287U CN 202020932802 U CN202020932802 U CN 202020932802U CN 212285287 U CN212285287 U CN 212285287U
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Abstract
The utility model discloses an improvement parent tube soil thermal desorption efficiency's device based on hartmann whistle structure belongs to the intensive heat transfer field. The utility model comprises a base pipe, wherein a plurality of heat exchange units are arranged inside the base pipe; the heat exchange enhancement unit consists of a flue gas flow distribution unit and a flue gas flow disturbing unit; the flue gas shunting unit comprises a shunting plane and a shunting table; the flue gas shunting unit is fixed inside the base pipe through a plurality of supporting frames; a flue gas inlet of the heat exchange enhancement unit is formed between the adjacent support frames; the smoke turbulence unit is a Hartmann whistle resonance chamber. The Hartmann whistle resonant cavities in all the enhanced heat exchange units of the utility model can generate sound waves with higher sound pressure level, form strong disturbance to air flow and promote the heat exchange between hot flue gas in the pipe and the wall surface; meanwhile, solid impurities in hot flue gas are not easy to adhere to the pipe wall due to vibration caused by sound waves in the pipe, so that high heat exchange efficiency can be kept for a long time, and thermal desorption of soil is facilitated.
Description
Technical Field
The utility model relates to a reinforce heat transfer technical field, in particular to improvement parent tube soil thermal desorption efficiency's device based on hartmann whistle structure.
Background
In recent years, due to the problem of soil pollution caused by relocation of heavily polluted enterprises and treatment of pollutants, attention is paid to various social circles. Among the soil pollutants, volatile and semi-volatile pollutants are of great interest because of their high migration capacity and high toxicity. At present, the soil thermal desorption technology is a main means for treating the organic contaminated soil. The technology heats the soil in a direct or indirect mode to reach a certain temperature, organic pollutants contained in the organic polluted soil can be gasified or decomposed, and the pollutants finally enter a gas phase and enter the next procedure to be removed.
The application publication number is "CN 104438313A" Chinese utility model patent discloses a contaminated soil thermal desorption system and method of high-efficient retrieval and utilization of waste heat, utilizes the high temperature flue gas that the tail gas system of burning produced as the heat source among this patent, the pollutant in the desorption soil.
The heat exchange between the gas with higher temperature in the tube and the organic contaminated soil outside the tube is carried out by the base tube heat exchange technology, and the heat exchange efficiency between the gas and the soil influences the thermal desorption effect of the soil. The practical use of the heat exchange technology of the base tube preferably adopts high-temperature flue gas as a heat source to utilize waste heat. However, the high-temperature flue gas generally contains impurities, and the organic polluted soil outside the pipe is easy to adhere to the wall surface of the base pipe, and the factors influence the wall surface heat exchange.
However, in the prior art, the heat exchange tubes are mostly deformed and additionally provided with fins in various shapes to enhance heat exchange, but in the actual soil thermal desorption process, the heat exchange efficiency of the wall surfaces of the heat exchange tubes may be greatly reduced due to insufficient turbulent flow strength, low energy utilization efficiency and wall surface adhesion impurities, so that the thermal desorption efficiency of the organic contaminated soil is influenced.
SUMMERY OF THE UTILITY MODEL
In order to compensate for the defects of the prior art, the utility model provides a device for improving the thermal desorption efficiency of base pipe soil based on a Hartmann whistle structure.
The technical scheme of the utility model is that:
a device for improving the thermal desorption efficiency of base pipe soil based on a Hartmann whistle structure comprises a base pipe, wherein a plurality of heat exchange enhancement units are arranged inside the base pipe; the heat exchange enhancement unit consists of a flue gas flow distribution unit and a flue gas flow disturbing unit; the flue gas shunting unit comprises a shunting plane and a shunting table which is expanded from the shunting plane to the inner wall direction of the base pipe; the flue gas shunting unit is fixed inside the base pipe through a plurality of support frames; a flue gas inlet of the heat exchange enhancement unit is formed between the adjacent support frames; the smoke turbulence unit comprises an annular panel fixed on the inner wall of the base tube, a smoke channel with the outer diameter smaller than the inner diameter of the base tube is fixed on the annular panel, and an annular groove among the outer wall of the smoke channel, the annular panel and the inner wall of the base tube is a Hartmann whistle resonance chamber; the tail end of the smoke channel is connected with the annular panel to form a smoke outlet of the heat exchange strengthening unit.
The flow dividing plane and the flow dividing table guide hot flue gas entering the base pipe to a position between the flow dividing table and the inner wall of the base pipe, and the flow velocity of the flue gas is accelerated due to the reduction of the flow area of airflow; the flue gas directly enters the annular Hartmann whistle resonance chamber after passing through the flow splitting table, and the hot flue gas with higher flow velocity is extruded in the Hartmann whistle resonance chamber to generate sound waves with higher sound pressure level, so that strong disturbance is formed on the air flow, and the heat exchange between the hot flue gas in the pipe and the wall surface is promoted; meanwhile, solid impurities in hot flue gas are not easy to adhere to the pipe wall due to vibration caused by sound waves in the pipe, so that high heat exchange efficiency can be kept for a long time, and thermal desorption of soil is facilitated; when the smoke pressure in the Hartmann whistle resonant cavity reaches a certain value, part of smoke flows out of the Hartmann whistle resonant cavity and enters the next enhanced heat exchange unit through the smoke channel.
As a preferred scheme, the area of the flow dividing plane is 10% -40% of the sectional area of the base pipe; the maximum sectional area of the flow distribution table is 60% -90% of the sectional area of the base pipe. The reposition of redundant personnel plane can be flowed the flue gas and shunted to the pipeline wall along the reposition of redundant personnel platform, makes gaseous laminating wall flow, when increasing the velocity of flow, can guarantee that the flue gas that flows comes gets into Hartmann whistle resonance chamber.
As a preferred scheme, the shunting plane is circular or regular polygon; the flow distribution table is in a prismoid shape or a circular truncated cone shape.
Preferably, each enhanced heat exchange unit is uniformly distributed inside the base pipe. This setting can increase the homogeneity of handling the soil desorption.
As a preferred scheme, the distance between the adjacent enhanced heat exchange units is 1-20 cm.
Preferably, the support frame is a support rod fixed between the flow dividing table and the inner wall of the base pipe. The branch table and the branch plane are stably fixed inside the base tube through the support rod, the structure is simple, stable and reliable, and meanwhile, the flue gas can be guaranteed to enter the reinforced heat exchange unit.
As the preferred scheme, the central axis of each heat exchange unit is superposed with the central axis of the base pipe.
According to the method for improving the thermal desorption efficiency of the soil of the base pipe by adopting the device, hot flue gas is introduced into the base pipe, airflow enters the Hartmann whistle resonance chamber of the first enhanced heat exchange unit from the flue gas inlet along the flow dividing platform after touching the flow dividing plane, the hot flue gas generates sound waves after being accumulated in the Hartmann whistle resonance chamber, and the sound waves generate strong disturbance to the flue gas; after the pressure of the hot flue gas in the Hartmann whistle resonance chamber of the first enhanced heat exchange unit is increased to a certain degree, part of the hot flue gas flows out of the Hartmann whistle resonance chamber and enters the next enhanced heat exchange unit from the flue gas channel through the flue gas outlet; the pressure of the flue gas in the Hartmann whistle resonant cavities of all the enhanced heat exchange units is periodically changed and sound waves are generated, so that the flue gas is strongly disturbed, and the heat exchange efficiency is enhanced.
As a preferred scheme, the temperature of the hot flue gas is 300-1200 ℃.
As a preferred scheme, the pressure of hot flue gas entering a base pipe is 0.12-0.5 MPa.
The utility model has the advantages that:
the utility model discloses well interior circulation hot flue gas of parent tube, the parent tube is the organic contaminated soil outward, utilizes the heat of hot flue gas to carry out the thermal desorption to the organic contaminated soil. The hot flue gas flows through the hot flue gas flow-dividing plane from the flow passage and accelerates to the flow-dividing table, after the hot flue gas is accelerated by the flow-dividing table, the smoke flowing at high speed makes the smoke in the Hartmann whistle resonant cavity difficult to flow out and accumulate pressure, the pressure in the cavity is high enough to flow out part of the smoke after reaching a certain critical point, the pressure range is generally 5-100kPa, the smoke pressure in the Hartmann whistle resonant cavity is changed periodically to generate stable sound wave, according to the test, the Hartmann whistle resonant cavity in the device of the utility model can generate the frequency range of 2-5kHz, the sound pressure level can reach 90-120dB, the sound wave strongly disturbs the flue gas in the pipe, the heat exchange efficiency is obviously enhanced, meanwhile, solid impurities are not easy to adhere and accumulate inside and outside the pipe wall due to vibration caused by sound waves in the pipe, the heat exchange efficiency of the wall surface is kept at a higher level, and thermal desorption of soil is facilitated.
The smoke flowing out of the Hartmann whistle sounding structure at the upper stage enters the Hartmann whistle sounding structure at the lower stage through the hot smoke channel, and the energy of the smoke is effectively utilized in a multi-stage utilization mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of the radial cross-section of the device of the present invention;
FIG. 2 is a schematic view of a cross-sectional structure of the device of the present invention in a vertical direction;
FIG. 3 is a schematic view of another angle of the radial cross-section of the device of the present invention;
FIG. 4 is a schematic cross-sectional view of the device of the present invention in another angular vertical direction;
FIG. 5 is a schematic view of a cross-sectional structure in the vertical and radial directions at the annular panel;
fig. 6 is a comparison graph of thermal desorption efficiency of the device of the present invention to the pollutants PAHs with the control group;
figure 7 is the utility model discloses the device is to pollutant PCBs's thermal desorption efficiency contrast map with the control group.
Detailed Description
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present invention, but do not require the present invention to be constructed or operated in a specific orientation, and therefore, cannot be construed as limiting the present invention. The terms "connected" and "connected" in the present invention are to be understood in a broad sense, and may be connected or detachably connected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
Example 1
As shown in fig. 1-5, a device for improving the thermal desorption efficiency of soil on a base pipe based on a hartmann whistle structure comprises a base pipe 10; the base pipe 10 is made of a heat-resistant and corrosion-resistant metal material.
As shown in fig. 2 and 4, a plurality of enhanced heat exchange units are disposed inside the base pipe 10. The reinforced heat exchange units are identical in structure and are uniformly distributed, and the distance between every two adjacent reinforced heat exchange units is 1-20 cm. Each enhanced heat exchange unit consists of a flue gas flow distribution unit and a flue gas flow disturbing unit.
Wherein, flue gas reposition of redundant personnel unit includes reposition of redundant personnel plane 2 and by reposition of redundant personnel plane 2 to the reposition of redundant personnel platform 6 of the expansion of parent tube 10 inner wall direction. In the present embodiment, the flow dividing plane 2 is circular and the flow dividing table 6 is circular truncated cone-shaped. The diameter of the dividing plane 2 is 1/3 of the inner diameter of the base pipe 10. The shunting table 6 and the shunting plane 2 are integrally formed and are made of heat-resistant and corrosion-resistant materials. The flow dividing table 6 is fixedly connected with the inner wall of the base pipe 10 through a plurality of support frames 1. A flue gas inlet 8 of the heat exchange strengthening unit is formed between the adjacent support frames 1.
The flue gas vortex unit is including fixing the annular panel 9 at parent tube 10 inner wall, is fixed with the flue gas passageway 4 that the external diameter is less than the parent tube internal diameter on the annular panel 9, and flue gas passageway outer wall 5 is laminated with the inner wall of annular panel 9. The annular groove among the outer wall 5 of the flue gas channel, the annular panel 9 and the inner wall of the base tube 10 is a Hartmann whistle resonance chamber 3; the tail end of the flue gas channel 4 is connected with the annular panel 9 to form a flue gas outlet 7 of the heat exchange strengthening unit.
In this embodiment, the central axis of each heat exchange unit coincides with the central axis of the base pipe.
In order to ensure that the hot flue gas enters the Hartmann heel resonance chamber 3 as directly as possible, the maximum diameter of the flow dividing table 6 is slightly larger than the outer diameter of the flue gas pipeline 4.
The flow dividing plane 2 and the flow dividing table 6 guide the hot flue gas entering the base pipe 10 to a position between the flow dividing table and the inner wall of the base pipe, and the flow velocity of the flue gas is accelerated due to the reduction of the flow area of the airflow; the flue gas directly enters the annular Hartmann whistle resonance chamber 3 after passing through the flow splitting table 6, the hot flue gas with higher flow velocity is extruded in the Hartmann whistle resonance chamber to generate sound waves with higher sound pressure level, strong disturbance is formed on the air flow, and the heat exchange between the hot flue gas in the pipe and the wall surface is promoted; meanwhile, solid impurities in hot flue gas are not easy to adhere to the pipe wall due to vibration caused by sound waves in the pipe, so that high heat exchange efficiency can be kept for a long time, and thermal desorption of soil is facilitated; when the pressure of the smoke in the Hartmann whistle resonance chamber 3 reaches a certain value, part of the smoke flows out of the Hartmann whistle resonance chamber 3 and enters the next intensified heat exchange unit through the smoke channel 4.
Example 2 application example
In order to verify the utility model discloses the device can improve soil thermal desorption efficiency, designs following experiment, specifically as follows:
the soil to be tested is collected from a certain organochlorine pesticide production enterprise site and a certain abandoned coking plant site in Hangzhou, Zhejiang, the soil is dried in the air, stone impurities are removed, and the soil is screened by a 18-mesh (1 mm) sieve and then stored at low temperature to be a soil sample. The experiment sets up the control group, and the control group heat exchange base pipe is inside to be glossy fluorescent tube, does not have any structure that improves heat exchange efficiency, the heat exchange tube material with the utility model discloses the base pipe material is the same. The experimental group used the apparatus of example 1.
Control group (traditional mode):
fixing the lower part of the base tube, which does not have any heat exchange efficiency improvement inside, on the bracket; placing a bracket and the base tube in a rotary furnace (the base tube is placed in the middle of the rotary furnace as much as possible through the bracket) with the model of XTL1100-100 vacuum tube in a laboratory, butting an air supply pipe of the rotary furnace with one end of the base tube, and communicating the other end of the base tube with a tail gas absorption device; 5Kg of soil to be tested was filled in a rotary kiln. Introducing high-temperature nitrogen at 800 deg.C under the pressure of 0.15MPa, and statically introducing air for 60 min.
Experimental group (enhanced heat exchange):
the lower part of the base pipe in the device of the embodiment 1 is fixed on a bracket; placing a bracket and the base tube in a rotary furnace (the base tube is placed in the middle of the rotary furnace as much as possible through the bracket) with the model of XTL1100-100 vacuum tube in a laboratory, butting an air supply pipe of the rotary furnace with one end of the base tube, and communicating the other end of the base tube with a tail gas absorption device; 5Kg of soil to be tested was filled in a rotary kiln. Introducing high-temperature nitrogen at 800 deg.C under the pressure of 0.15MPa, and statically introducing air for 60 min.
The soil which is not desorbed, the soil which is thermally desorbed by a control group and the soil which is thermally desorbed by an experimental group are sequentially subjected to Soxhlet extraction, rotary evaporation, silica gel column passing and low-temperature nitrogen blowing and then are subjected to machine detection.
The qualitative and quantitative detection and analysis of the PAHs were performed by using a gas chromatography-mass spectrometer (GC/MS), and the results showed that, as shown in fig. 6, the thermal desorption efficiency of the PAHs in the control group was 79.6%, and the thermal desorption efficiency of the PAHs in the experimental group was 86.3%.
The JMS800D high-resolution chromaticness online (HRGC/HRMS) is adopted to detect the content of PCBs in the sample, and the analysis result shows that the PCBs thermal desorption efficiency of the control group is 64.2 percent and the PCBs thermal desorption efficiency of the experimental group is 72.5 percent as shown in figure 7.
To sum up, the utility model discloses a device can improve the thermal desorption efficiency of soil, and the effect is showing.
Because the laboratory condition limits, thermal desorption efficiency is general, if use the industrial high temperature flue gas as the hot-fluid to carry out the desorption to soil, desorption efficiency can be higher.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (7)
1. The utility model provides an improve device of parent tube soil thermal desorption efficiency based on hartmann whistle structure, includes the parent tube, its characterized in that: a plurality of enhanced heat exchange units are arranged inside the base pipe; the heat exchange enhancement unit consists of a flue gas flow distribution unit and a flue gas flow disturbing unit; the flue gas shunting unit comprises a shunting plane and a shunting table which is expanded from the shunting plane to the inner wall direction of the base pipe; the flue gas shunting unit is fixed inside the base pipe through a plurality of support frames; a flue gas inlet of the heat exchange enhancement unit is formed between the adjacent support frames; the smoke turbulence unit comprises an annular panel fixed on the inner wall of the base tube, a smoke channel with the outer diameter smaller than the inner diameter of the base tube is fixed on the annular panel, and an annular groove among the outer wall of the smoke channel, the annular panel and the inner wall of the base tube is a Hartmann whistle resonance chamber; the tail end of the smoke channel is connected with the annular panel to form a smoke outlet of the heat exchange strengthening unit.
2. The device for improving the thermal desorption efficiency of soil on a base pipe based on the Hartmann whistle structure as claimed in claim 1, wherein: the area of the flow dividing plane is 10% -40% of the sectional area of the base pipe; the maximum sectional area of the flow distribution table is 60% -90% of the sectional area of the base pipe.
3. The apparatus for improving the thermal desorption efficiency of soil on a base pipe based on the Hartmann whistle structure as claimed in claim 1 or 2, wherein: the shunting plane is circular or regular polygon; the flow distribution table is in a prismoid shape or a circular truncated cone shape.
4. The device for improving the thermal desorption efficiency of soil on a base pipe based on the Hartmann whistle structure as claimed in claim 1, wherein: all the heat exchange units are uniformly distributed inside the base pipe.
5. The device for improving the soil thermal desorption efficiency of the base pipe based on the Hartmann whistle structure as claimed in claim 1 or 4, wherein: and the distance between every two adjacent enhanced heat exchange units is 1-20 cm.
6. The device for improving the thermal desorption efficiency of soil on a base pipe based on the Hartmann whistle structure as claimed in claim 1, wherein: the support frame is a support rod fixed between the flow dividing table and the inner wall of the base pipe.
7. The device for improving the thermal desorption efficiency of soil on a base pipe based on the Hartmann whistle structure as claimed in claim 1, wherein: the central axis of each heat exchange unit is superposed with the central axis of the base pipe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111545559A (en) * | 2020-05-28 | 2020-08-18 | 中国计量大学 | Device for improving thermal desorption efficiency of base pipe soil based on Hartmann whistle structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111545559A (en) * | 2020-05-28 | 2020-08-18 | 中国计量大学 | Device for improving thermal desorption efficiency of base pipe soil based on Hartmann whistle structure |
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