CN210292895U - Sectional type condensation heat exchanger suitable for unsteady state volatile organic gas - Google Patents

Abstract

The utility model relates to a sectional type condensation heat exchanger suitable for unsteady state volatile organic gas, including from the top down arrange normal atmospheric temperature cooling heat transfer section, middle partition layer, low temperature condensation heat transfer section in proper order, the tube side of normal atmospheric temperature cooling heat transfer section and low temperature condensation heat transfer section passes middle partition layer and mutual switch-on still are equipped with rather than the tube side switch-on and have the fluid reservoir of gas outlet and liquid outlet in the bottom of low temperature condensation heat transfer section, still be equipped with the baffle of downward sloping in the fluid reservoir in the gas outlet upper end. Compared with the prior art, the utility model discloses can be under ordinary pressure and negative pressure operating mode for gaseous state material cooling, condensation route are shortest in equipment, and the treatment effeciency is high, low power dissipation etc.

Description

Sectional type condensation heat exchanger suitable for unsteady state volatile organic gas

Technical Field

The utility model belongs to the technical field of the condensation heat exchanger, a sectional type condensation heat exchanger suitable for unsteady state volatility organic gas is related to.

Background

Along with the rapid development of economy, when people consume a large amount of energy, a large amount of waste gas and smoke dust impurities are discharged into the environment atmosphere, the quality of the atmospheric environment is seriously influenced, the environmental protection legislation is increasingly strict, organic solvents are used as common substances in industries such as chemical engineering and pharmaceutical production, a part of organic solvents volatilize into gas at a lower temperature, the environment is polluted, the part of gas needs to be intensively treated, currently developed methods such as catalytic oxidation and incineration are all biased to tail gas end treatment, and if the organic solvents with recovery values can be fully recovered in the process, the solvent utilization rate can be improved, and the downstream treatment and subsequent tail end treatment amount can be greatly reduced.

The condensation separation method is characterized in that the boiling point difference between volatile organic compounds and inert gases is utilized, after the temperature is reduced, the volatile organic compounds with higher boiling points are condensed and separated, the key of the process is that sufficient heat exchange is provided to condense the organic compounds, and the heat exchange efficiency can be improved by methods of improving the heat exchange area, prolonging the retention time and the like by using a condenser for condensation, so that the problems of incompact equipment and pipelines, large system resistance and the like existing in a plurality of traditional heat exchangers are solved.

In CN101943527A, a multi-shell-pass countercurrent speed-increasing shell-and-tube heat exchanger is used, and a single shell pass is divided into multiple shell passes by arranging a longitudinal countercurrent speed-increasing guide plate in a shell.

CN204337811U a combined equipment of overhead condenser and reflux drum can reduce equipment volume, reduces the equipment consumptive material, but the refrigerant of shell side singleness is unfavorable for the abundant recovery of the organic gas of partial boiling point minimum.

CN105973020A discloses a sectional type condensation heat exchanger suitable for be rich in volatile organic gas, including supplying the tube bank that the gas that waits to condense flows and the barrel that surrounds the tube bank and supply the cold fluid to flow, this barrel divide into multistage barrel unit from top to bottom, and every section barrel unit all is equipped with independent shell side fluid entry and, through middle separation fault sealing connection between two adjacent barrel units, middle separation fault include connecting pipe and heat preservation surface course, the connecting pipe pass the heat preservation surface course to put through the tube bank between two adjacent barrel units. This condenser tube side UNICOM, the liquid that the condensation got off directly fall back to the album fluid reservoir, probably have the uneven problem of heat transfer in the tube side, and the gaseous condensation easily forms the entrainment in the collection fluid reservoir simultaneously, goes out the liquid that the condensation got off with the band, reduces volatile organic gas's condensation recovery effect.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide a sectional type condensing heat exchanger suitable for unstable volatile organic gases.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a sectional type condensation heat exchanger suitable for unsteady state volatile organic gas, includes from the top down and arranges normal atmospheric temperature cooling heat transfer section, middle wall and redistribution layer, low temperature condensation heat transfer section in proper order, the tube side of normal atmospheric temperature cooling heat transfer section and low temperature condensation heat transfer section passes middle wall layer and switch-on each other still is equipped with rather than the tube side switch-on and has the liquid collection jar of gas outlet and liquid outlet in the bottom of low temperature condensation heat transfer section, still be equipped with the baffle of downward sloping in the liquid collection jar in the gas outlet upper end.

The utility model discloses in order to avoid collecting liquid jar interior gas to walk the shortest way when gas outlet, collect liquid jar gas outlet upper end installation baffle, a dwell time for extension gas in collecting liquid jar, supplementary volatile organic gas retrieves, unsteady state organic gas passes through sectional type condenser most and is collected by the condensation, the part can be smugglied secretly to gas outlet by difficult condensable gas (like nitrogen gas) mist, this gas forms the fluid passage that gas secondary condensation was smugglied secretly to the mist in baffle department, this baffle lower extreme design is the baffle form simultaneously, the gas-liquid separation of being convenient for.

Furthermore, a gas channel which covers the gas outlet in the horizontal direction and only exposes out of the downward inclined port is formed between the baffle plate and the inner side wall surface of the liquid collecting tank in a surrounding mode.

Furthermore, the included angle between the baffle and the wall surface of the liquid collecting tank is 30-60 degrees.

Furthermore, the distance between the installation position of the baffle and the liquid collecting tank and the gas outlet is 2-4 times of the inner diameter of the gas outlet. If the baffle is too big apart from the export, the gas flow that most mist foam smugglied secretly can directly play the effect that can not play the separation through gas outlet, if the baffle design is apart from the export undersize, not only can block the output of air current, increases the pressure drop of equipment export, and the negative pressure of gas outlet pipeline can cause the baffle to easily drop simultaneously. The bottom end of the baffle may be designed to be approximately flush with the bottom of the gas outlet. Gaseous easily forms the mist under the condition of collection liquid jar interior microstrip malleation and smugglies secretly, and when this type of gas touchd the baffle, liquid wherein separated very easily, for making things convenient for the liquid on the baffle to drip, the baffle design becomes the cockscomb structure, and in the air current motion process, tiny condensation liquid constantly collides the baffle and gathers to grow up, and the design of zigzag does benefit to liquid and condenses to drip in the bottom of sawtooth, plays the effect of secondary condensation.

Further, normal atmospheric temperature cooling heat transfer section includes cooling zone tube bank and envelops the cooling zone casing of cooling zone tube bank, the low temperature condensation heat transfer section includes that bottom switch-on liquid collection tank open-top's condensation segment tube bank and envelops the condensation segment casing of condensation segment tube bank, cooling zone tube bank and condensation segment tube bank are through the well fault switch-on that separates, and the cooling zone casing then separates by the well fault with the condensation segment casing.

Furthermore, the middle partition layer is provided with a hollow partition layer cavity, and the upper end and the lower end of the hollow partition layer cavity are respectively communicated with the cooling section tube bundle and the condensing section tube bundle. Furthermore, the tube pass outlet of the cooling section tube bundle entering the hollow cavity of the partition layer is an inclined tube port, and meanwhile, the tube pass outlet of the cooling section tube bundle entering the hollow cavity of the partition layer is an inclined tube port;

the tube pass outlet of the condensation segment tube bundle entering the liquid collecting tank is designed by adopting an inclined tube orifice. The condensate is favorably dripped, and the gas-liquid mixed phase is redistributed in the hollow cavity of the partition layer, so that the heat exchange of the condenser is more favorably realized. The longitudinal cross-section of the oblique nozzle portion (i.e., the cross-section along the direction of the tube bundle) here is in the shape of a right triangle.

Furthermore, the cooling section shell and the condensing section shell are respectively provided with a baffle plate for prolonging the heat exchange time of the cooling medium and the tube pass, so that the turbulent flow formed in the shell layer is facilitated, and the heat exchange efficiency of the shell pass is improved.

Furthermore, the pipe diameter design of the pipe bundle of the low-temperature condensation heat exchange section is smaller than the pipe diameter of the normal-temperature cooling heat exchange section, and the pipe diameter is large in quantity, so that the heat exchange area of the low-temperature condensation heat exchange section can be increased, meanwhile, the low-temperature condensation heat exchange section can be provided with expansion joints, and the size change of the low-temperature medium heat exchange process is reduced, and the equipment damage is caused.

Furthermore, a liquid discharge valve is arranged at a liquid outlet on the liquid collection tank, a remote transmission type liquid level meter is further installed on the side surface of the liquid collection tank, and the valve opening degree of the liquid discharge valve is controlled by feeding back a liquid level signal through the remote transmission type liquid level meter;

the top of the normal-temperature cooling heat exchange section is also sequentially provided with a tube box communicated with a tube pass and a tube pass fluid gas inlet, the pipelines of the tube pass fluid gas inlet and the tube pass fluid gas outlet are respectively provided with a linked pneumatic regulating valve, and through linkage regulation of the two pneumatic regulating valves and a liquid discharge valve, the unstable-state gas can stay for a longer time in the sectional condenser, so that a better gas-liquid separation effect is achieved.

Furthermore, normal-temperature cooling water flows in the shell pass of the normal-temperature cooling heat exchange section, and low-temperature medium with the temperature lower than the normal temperature flows in the shell pass of the low-temperature condensation heat exchange section. The temperature variation range of the common normal-temperature cooling water varies from 5 ℃ to 35 ℃ according to the environmental temperature, and the low-temperature medium can vary from-40 ℃ to-5 ℃ according to the equipment conditions and the use working conditions.

Compared with the prior art, the utility model can ensure that the gaseous material is shortest in cooling, cooling and condensing paths in the equipment under the working conditions of normal pressure and negative pressure, the resistance of the equipment and the pipeline which pass through is reduced and the occupied space is minimum, simultaneously, the heat transfer effect and the condensing and recovering depth are gradually increased in a gradient manner in the same equipment along with the temperature change, the whole condensing and recovering process does not need extra pressurization assistance, different gradient condensation is realized in the same equipment, and the installation cost and the equipment manufacturing cost are greatly reduced; gaseous behind the normal atmospheric temperature cooling condensation module through sectional type heat exchanger, partial volatile organic gas becomes liquid, forms the gas-liquid mixture phase and carries out the condensation to the low temperature condensation module and retrieve, the increase of mixed phase medium heat transfer coefficient this moment, heat exchange efficiency improves, the condensation of improvement volatile organic matter that can be fine is retrieved, carry out gas-liquid separation through the liquid level of controlling this equipment gas outlet pressure and liquid collection tank simultaneously, provide fine method for the recovery reuse of volatile organic matter and reduce volatile organic gas's emission.

Drawings

FIG. 1 is a schematic structural view of a sectional condenser;

FIG. 2 is a control schematic of a sectional condenser;

FIG. 3 is a schematic structural view of a baffle;

the notation in the figure is:

the method comprises the following steps of 1-a tube side fluid gas inlet, 2-a gas outlet, 3-a liquid outlet, 4-a tube box, 5-a middle partition layer, 6-a cooling section shell, 7-a condensation section shell, 8-a cooling section shell side inlet, 9-a cooling section shell side outlet, 10-a condensation section shell side inlet, 11-a condensation section shell side outlet, 12-an expansion joint, 13-a baffle, 14-a liquid level meter mounting port, 15-a remote transmission type liquid level meter and 16-a pneumatic adjusting valve.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1:

a sectional type condensation heat exchanger suitable for unsteady volatile organic gases is structurally shown in figure 1 and comprises a normal-temperature cooling heat exchange section, a middle separation fault 5 and a low-temperature condensation heat exchange section which are sequentially arranged from top to bottom, tube passes of the normal-temperature cooling heat exchange section and the low-temperature condensation heat exchange section penetrate through the middle separation fault 5 and are mutually communicated, a liquid collection tank communicated with the tube passes and provided with a gas outlet 2 and a liquid outlet 3 is further arranged at the bottom of the low-temperature condensation heat exchange section, and a downward-inclined baffle 13 is further arranged at the upper end of the gas outlet 2 in the liquid collection tank.

A gas passage which covers the gas outlet 2 in the horizontal direction and exposes only the obliquely downward opening is formed between the baffle plate 13 and the inner wall surface of the liquid collection tank. The included angle between the baffle 13 and the wall surface of the liquid collecting tank is 30-60 degrees, and the baffle 13 is arranged at the position 2-3 times of the pipe diameter of the gas outlet from the upper end of the gas outlet.

Gaseous microstrip malleation's condition in album liquid jar is down easily formed the fog and is smugglied secretly, and when this type of gas touchd baffle 13, liquid wherein separates very easily, and for making things convenient for the liquid on the baffle 13 to drip, baffle 13 designs into the cockscomb structure, please see shown in figure 3, baffle 13 and album liquid jar adopt welded mode to be connected, and for making the gaseous abundant contact with baffle 13 that smugglies secretly, baffle 13 should be at 30 ~ 60 ℃ with the angle that collection liquid jar is connected.

Referring to fig. 1 again, the normal temperature cooling heat exchange section includes a cooling section tube bundle and a cooling section shell 6 wrapping the cooling section tube bundle, the low temperature condensing heat exchange section includes a condensing section tube bundle whose bottom is communicated with the top opening of the liquid collecting tank and a condensing section shell 7 wrapping the condensing section tube bundle, the cooling section tube bundle is communicated with the condensing section tube bundle through a middle partition fault 5, and the cooling section shell 6 and the condensing section shell 7 are separated by the middle partition fault 5. And the cooling section shell 6 is provided with an independent cooling section shell pass inlet 8 and a cooling section shell pass outlet 9, and the condensing section shell 7 is provided with an independent condensing section shell pass inlet 10 and a condensing section shell pass outlet 11.

Referring to fig. 1 again, the middle partition layer 5 has a hollow partition layer cavity, and the upper and lower ends of the hollow partition layer cavity are respectively connected to the cooling section tube bundle and the condensing section tube bundle. The low-temperature condensation heat exchange section is provided with an expansion joint 12. The tube pass outlet of the cooling section tube bundle entering the hollow cavity of the partition layer is an inclined tube opening. Baffles are arranged in the cooling section shell 6 and the condensing section shell 7.

Referring to fig. 2, a liquid discharge valve is arranged at a liquid outlet 3 on the liquid collection tank, a liquid level meter mounting port 14 is further arranged on the side surface of the liquid collection tank, a remote transmission type liquid level meter 15 is correspondingly mounted, and a liquid level signal is fed back by the remote transmission type liquid level meter 15 to control the valve opening degree of the liquid discharge valve; the top of the normal temperature cooling heat exchange section is also provided with a tube box 4 and a tube side fluid gas inlet 1 which are communicated with the tube side of the normal temperature cooling heat exchange section in sequence, and pipelines at the tube side fluid gas inlet 1 and the gas outlet 2 are respectively provided with a linked pneumatic adjusting valve 16.

Normal temperature cooling water flows in the shell pass of the normal temperature cooling heat exchange section, and low temperature media (such as glycol aqueous solution and the like) with the temperature lower than the normal temperature flows in the shell pass of the low temperature condensation heat exchange section.

Comparative example 1

Compared to example 1, most of them are the same except that the baffle 13 is omitted.

Comparative example 2

Compared with the embodiment 1, most of the heat exchangers are the same, except that the middle partition layer 5 in the embodiment does not have a hollow cavity of the partition layer, namely, the tube bundle of the normal-temperature cooling heat exchange section is directly communicated with the tube bundle of the low-temperature condensation heat exchange section, and meanwhile, the baffle 13 is omitted.

Comparative example 3

Compared with the embodiment 1, most of the parts are the same, except that the middle separation fault layer 5 in the embodiment does not have a hollow cavity of the partition layer, namely, the tube bundle of the normal-temperature cooling heat exchange section is directly communicated with the tube bundle of the low-temperature condensation heat exchange section, meanwhile, the baffle 13 is omitted, and the inclined tube opening is changed into a common flat tube opening (namely, the section along the longitudinal direction of the inclined tube opening is rectangular).

Example 2

Preparation of pharmaceutical intermediate by using tetrahydrofuran as solvent, volatile organic compounds discharged during organic solvent evaporation, tetrahydrofuran gas or mixed gas of tetrahydrofuran and inert gas (such as air or nitrogen gas)

After passing through the filter, the volatile organic compounds enter the condensers of the embodiment 1 and the comparative examples 1 to 3 respectively, and a part of volatile organic compounds can be condensed by primary cooling of the normal-temperature water of the shell pass of the normal-temperature cooling section, and then the volatile organic compounds enter the low-temperature water of the shell pass of the low-temperature cooling section for condensation, and most of the volatile organic compounds can be condensed and enter the liquid collection tank. In the case where the inlet gage pressure is 10KPa or less, if the volatile organic gas is pure tetrahydrofuran gas, the recovery efficiency by the apparatus of example 1 can reach 99.9%.

If the gas composition is a mixed gas of tetrahydrofuran and an inert gas (such as air or nitrogen, and the like), after comparing the comparative example 2 with the comparative example 3, the recovery efficiency of the mixed gas of tetrahydrofuran and the inert gas is increased from 98.6% to 98.9% by increasing the design of the inclined tube orifice of the tube side tube bundle, after further comparing the comparative example 3 with the comparative example 1, the recovery efficiency of the mixed gas is increased to 99.4% by increasing the hollow cavity of the partition layer and the design of the inclined tube orifice of the tube side tube bundle simultaneously, and after adding the gas outlet baffle on the basis, the recovery rate is increased to 99.7% by comparing the example 1 with the comparative example 3.

Example 3

The polyethylene catalyst uses pentane as a solvent, the used organic solvent needs to be recovered after production is finished, meanwhile, nitrogen is adopted for auxiliary recovery for sufficient drying, and the part of gas is unstable gas, volatile organic pentane gas brought by difficult-to-condense gas or mixed gas of pentane and inert gas (such as air or nitrogen and the like). Under the condition that the inlet gauge pressure is less than or equal to 10KPa, if the volatile organic gas is pure pentane gas, 99 percent of pentane can be recovered.

If the gas composition is mixed gas of tetrahydrofuran and inert gas (such as nitrogen, and the like), after comparing comparative example 2 with comparative example 3, the recovery efficiency of the mixed gas of pentane and the inert gas is increased from 95% to 96.5% by increasing the design of the inclined tube orifice of the tube side tube bundle, after further comparing comparative example 3 with comparative example 1, the recovery efficiency of the mixed gas is increased to 98.2% by increasing the design of the hollow cavity of the partition layer and the inclined tube orifice of the tube side tube bundle, after adding the baffle on the basis, finally, the recovery rate is increased to 98.9% by comparing example 1 with comparative example 3, thus, organic matters can be effectively condensed and recovered by the condenser of example 1 and the gas-liquid separation method, and the recycling is effectively realized.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims (10)

1. Sectional type condensation heat exchanger suitable for unsteady volatile organic gas, including from the top down arrange normal atmospheric temperature cooling heat transfer section, middle partition layer, low temperature condensation heat transfer section in proper order, the tube side of normal atmospheric temperature cooling heat transfer section and low temperature condensation heat transfer section passes middle partition layer and switch-on each other still is equipped with rather than the tube side switch-on and has the liquid collection jar of gas outlet and liquid outlet in the bottom of low temperature condensation heat transfer section, its characterized in that, still be equipped with the baffle of downward sloping in the liquid collection jar in the gas outlet upper end.

2. The sectional condensing heat exchanger for unsteady-state VOC gas as claimed in claim 1, wherein a gas channel formed between the baffle and the inner sidewall surface of the liquid collecting tank covers the gas outlet in horizontal direction and exposes only the downward inclined port.

3. The sectional condensing heat exchanger for unsteady state volatile organic gases according to claim 1, characterized in that the angle between the baffle and the wall of the liquid collecting tank is 30-60 °.

4. The sectional type condensation heat exchanger suitable for the unsteady-state volatile organic gas according to claim 1, wherein the distance between the installation position of the baffle plate and the liquid collecting tank and the gas outlet is 2-4 times of the inner diameter of the gas outlet.

5. The sectional type condensation heat exchanger applicable to the unsteady-state volatile organic gas according to claim 1, wherein the normal temperature cooling heat exchange section comprises a cooling section tube bundle and a cooling section shell covering the cooling section tube bundle, the low temperature condensation heat exchange section comprises a condensation section tube bundle with the bottom communicated with an opening at the top of the liquid collection tank and a condensation section shell covering the condensation section tube bundle, the cooling section tube bundle and the condensation section tube bundle are communicated through an intermediate partition and a redistribution layer, the cooling section shell and the condensation section shell are separated by the intermediate partition, and a gas-liquid mixed phase in the tube layer is redistributed in the intermediate partition and the redistribution layer.

6. The sectional type condensation heat exchanger suitable for the unsteady-state volatile organic gas according to claim 5, wherein the middle partition layer is provided with a partition layer hollow cavity, and the upper end and the lower end of the partition layer hollow cavity are respectively communicated with the cooling section tube bundle and the condensing section tube bundle.

7. The sectional type condensation heat exchanger suitable for the unsteady-state volatile organic gas according to claim 5, wherein the tube side outlet of the cooling section tube bundle entering the hollow cavity of the partition layer is an inclined tube port;

the tube pass outlet of the condensation segment tube bundle entering the liquid collecting tank is designed by adopting an inclined tube orifice.

8. The sectional condensing heat exchanger for unsteady state volatile organic gases according to claim 5, characterized in that baffles are installed in both the cooling section shell and the condensing section shell.

9. The sectional type condensation heat exchanger applicable to the unsteady-state volatile organic gases according to claim 1, wherein a liquid outlet on the liquid collection tank is provided with a liquid discharge valve, a remote transmission type liquid level meter is further installed on the side surface of the liquid collection tank, and the opening degree of the liquid discharge valve is controlled by feeding back a liquid level signal through the remote transmission type liquid level meter;

and the top of the normal-temperature cooling heat exchange section is also sequentially provided with a tube box communicated with a tube pass and a tube pass fluid gas inlet, and pipelines at the tube pass fluid gas inlet and the tube pass fluid gas outlet are respectively provided with a linked pneumatic regulating valve.

10. The sectional type condensation heat exchanger applicable to the unsteady-state volatile organic gases according to claim 1, wherein normal temperature cooling water flows through a shell side of the normal temperature cooling heat exchange section, and a low temperature medium with a temperature lower than the normal temperature flows through a shell side of the low temperature condensation heat exchange section.

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