CN214892731U - Heat exchange device for condensing VOCs gas - Google Patents

Abstract

The utility model discloses a heat transfer device for condensation VOCs is gaseous. The heat exchange device of the utility model comprises a vertically arranged shell and a heat exchange mechanism arranged in the shell; the heat exchange mechanism comprises a plurality of layers of heat exchange units distributed in a layered manner around a longitudinal central line, and each layer of heat exchange unit consists of a plurality of heat exchange tubes; and the heat exchange tubes in the adjacent heat exchange units are spirally wound towards the opposite direction. The utility model discloses a indirect heating equipment compact structure, it is corrosion-resistant, guarantee the high-efficient heat transfer of two kinds of fluids of big difference in temperature in same indirect heating equipment, can extensively be applicable to in the VOCs recovery processing device for trades such as car train loading, pier shipment, warehousing and transportation tank field, bio-pharmaceuticals.

Description

Heat exchange device for condensing VOCs gas

Technical Field

The utility model relates to a heat transfer device, in particular to a heat transfer device for condensing VOCs is gaseous.

Background

The gaseous condensation recovery technique of VOCs provides the low temperature cold field by freon refrigerating system, and freon is the evaporation heat absorption in the heat-transfer pipe, and the gaseous exothermic condensation cooling of VOCs outside of tubes carries out the condensation and divides the oil recovery to realize the gaseous purification of VOCs and discharge. Conventional condensing oil-separating heat exchangers are in the form of vertical aluminum plate fin heat exchangers and horizontal shell and tube heat exchangers. The vertical aluminum plate fin heat exchanger is made of aluminum alloy, has high heat exchange coefficient, small channel pore, large heat exchange area and small occupied area, and is not resistant to sulfur corrosion such as hydrogen sulfide, mercaptan thioether and the like. The horizontal shell and tube heat exchanger has a large ice melting channel, a stainless steel heat exchange tube can resist sulfur corrosion, but the lower side of Freon horizontally enters the upper side of the heat exchange tube, and dead angles exist in oil return; the gas channel is a baffle plate channel, and has vortex dead angles, so that partial heat exchange effect is influenced.

Because VOCs gas may contain air, water vapor exists, when the temperature is lower than zero, the water vapor can be frozen outside the spiral pipe, along with the lengthening of the operation time of the device, ice can block a heat exchange channel of a shell pass, when the pressure difference of an inlet and an outlet of the heat exchange device reaches a certain value, the heat exchange device needs to be defrosted, at the moment, high-temperature Freon is introduced into the spiral pipe to heat and defrosted the ice on the pipe, the heat exchange device can operate in a condensation-defrosting-condensation circulation mode, and therefore the heat exchange device is required to be pressure-resistant and also needs to bear the thermal stress change caused by sudden thermal shock.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to solve the problem that prior art exists, the utility model provides a but be used for the gaseous heat transfer device of condensation VOCs, the oil return is smooth and easy under the low temperature state, and sulfur-resistant corrodes, and the condensate can flow automatically.

The technical scheme is as follows: the heat exchange device for condensing VOCs gas comprises a vertically arranged shell and a heat exchange mechanism arranged in the shell; the heat exchange mechanism comprises a plurality of layers of heat exchange units distributed in a layered manner around a longitudinal central line, and each layer of heat exchange unit consists of a plurality of heat exchange tubes; and the heat exchange tubes in the adjacent heat exchange units are spirally wound towards the opposite direction.

The heat exchange tube comprises a first pipeline which is fixed with the upper tube plate and is in a long straight shape and a second pipeline which is in a spiral shape and is communicated with the first pipeline, and the lower end of the second pipeline is fixed with the lower tube plate.

The upper tube plate and the upper end of the shell form a mixing cavity for mixing refrigerants, the refrigerant is sent into the mixing cavity by the flow equalizer to be mixed, and a refrigerant inlet of the heat exchange tube is communicated with the mixing cavity.

The flow equalizer comprises a main pipe, a plurality of branch pipes communicated with the outlet of the main pipe and a plurality of distributors communicated with the outlets of the branch pipes, and the distributors are uniformly and circumferentially distributed at the top end of the mixing cavity.

A supporting mechanism is arranged in the middle of the heat exchange cavity of the shell, and a heat exchange unit close to the supporting mechanism is fixed around the supporting mechanism.

The top end of the shell is provided with a sealing plate, and the bottom end of the shell is provided with a sealing head.

A first air inlet used for feeding VOCs gas into is arranged above the heat exchange cavity, and a first air outlet used for feeding out the VOCs gas is arranged below the heat exchange cavity.

An oil outlet pipe for sending out condensed liquid is arranged below the heat exchange cavity, and a vertically extending refrigerant outflow pipe is arranged at the bottom end of the shell.

The supporting mechanism comprises a supporting pipe positioned at the middle section and a supporting rod positioned at the upper end of the supporting pipe and connected with the upper pipe plate.

A working method for condensing VOCs gaseous heat transfer device, including following step:

(a) VOCs gas enters the heat exchange cavity from the upper side part of the shell, high-concentration VOCs gas spirally downwards along the heat exchange tube in the heat exchange cavity, liquid oil products are condensed and separated in the low-temperature field, and purified clean VOCs gas is discharged from the first gas outlet (102);

(b) the liquid oil condensed and separated by the spiral heat exchange tube automatically flows out through the oil outlet tube under the action of gravity, and condensation and oil separation are completed;

(c) after refrigeration and heat exchange in the heat exchange tube, the refrigerant flows into the end enclosure through the lower tube plate and then flows out through the refrigerant outflow tube.

Has the advantages that: (1) in order to ensure smooth oil return of the heat exchange device, the heat exchange device adopts the vertical spiral heat exchange tube as an oil distribution structure, and the condensate can smoothly realize condensation under the combined action of gravity and the spiral pipeline on the outer wall of the spiral heat exchange tube; (2) in the utility model, in order to keep the condensed oil flowing out without power and flowing out downwards, the refrigerant and the VOCs gas are both in a flow passage which is arranged from top to bottom to carry out the sufficient and high-efficiency heat exchange in a spiral flow passage turbulent state; (3) the upper end of the heat exchange tube in the utility model is a straight tube section, which can effectively and evenly distribute the fluid in the tube, so that the fluid in the shell fully participates in heat exchange and reduces resistance loss, the lower end of the heat exchange tube is a spiral tube, and the spiral heat exchange tube adopts asymmetric flow design, the fluid inside and outside the tube has different circulation capacities, which is suitable for heat exchange of media with different enthalpy values at two sides, and the refrigerant in the tube can fully emit heat to achieve the purpose of energy saving and consumption reduction; (4) the utility model adopts the flow equalizer which can lead the refrigerant to be evenly sent into the heat exchange device, flow equalizes in the top cavity and enters the cooling area of the heat exchange tube, and leads each heat exchange tube to be filled with the refrigerant for heat exchange; (5) the utility model adopts the spiral pipe as the heat exchange pipe, the refrigerant forms a spiral turbulent flow state in the pipe, the stress change caused by large temperature difference mutation can be eliminated, the lubricating oil in the refrigerating system can be smoothly taken out of the heat exchanger by the top-down flow direction, and the problem of difficult low-temperature oil return of the compressor is solved; (6) the utility model discloses a refrigerant is gone into down and is gone out the form, and lubricating oil can all throw away from the refrigerant outflow pipe after along with refrigerant spiral motion in the refrigerating system, and the heat exchange tube is spiral downwards, does not have the dead angle and deposits lubricating oil; (7) the utility model discloses a this kind of spiral heat exchange tube carries out the gaseous oily condensation of branch of VOCs, has efficient heat transfer effect.

Drawings

FIG. 1 is a schematic structural view of a heat exchange device of the present invention;

FIG. 2 is a schematic view of the external structure of the heat exchanger of the present invention;

FIG. 3 is a cross-sectional view of the structure A-A of FIG. 1;

fig. 4 is a schematic structural view of a heat exchange mechanism in the heat exchange device of the present invention;

FIG. 5 is a schematic structural view of a heat exchange unit of the heat exchange device of the present invention;

FIG. 6 is a schematic structural view of a heat exchange unit of the heat exchange device of the present invention;

fig. 7 is the gas outlet structure diagram of the heat exchange device of the present invention.

Detailed Description

The structure of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1: as shown in fig. 1-3, the heat exchanger for condensing VOCs of the present invention comprises a vertically disposed housing 1 and a heat exchanging mechanism 2 disposed in the housing 1, wherein the heat exchanging mechanism 2 extends in the housing 1 along a longitudinal center line O; the upper end of the shell 1 is provided with a flow equalizer 3 for uniformly feeding the refrigerant into the heat exchange mechanism 2, an upper tube plate 4 and a lower tube plate 5 for fixing the heat exchange mechanism 2 are arranged in the shell 1, and a heat exchange cavity 100 is formed between the upper tube plate 4 and the lower tube plate 5.

The housing 1 is a cylindrical structure in the embodiment, and the housing 1 is made of steel 316L for specific applications. Inside heat exchange mechanism 2 was located the casing, through last tube sheet 4 and the fixed heat exchange mechanism 2's of lower tube sheet 5 both ends, mixing chamber 6 was located the top of last tube sheet 4, was the cavity that forms between shrouding 101 that sets up on 1 top of casing and the last tube sheet 4 promptly, and mixing chamber 6 is used for refrigerant homogeneous mixing heat exchange mechanism 2's refrigerant import and mixing chamber 6 intercommunication.

The utility model discloses a heat transfer device is provided with current equalizer 3 and is used for evenly sending into the refrigerant, current equalizer 3 including be responsible for 31, with a plurality of branch pipes 32 of being responsible for 31 export intercommunication and with a plurality of distributor 33 of a plurality of branch pipe 32 export intercommunication, the even circumference of a plurality of distributor 33 distributes in 1 top of casing, accomplishes the refrigerant feed liquor and accomplishes the equipartition space. As shown in fig. 3, the pipe diameter of the main pipe 31 is greater than the branch pipes 32, in order not to affect the flow rate of the refrigerant fed, in this embodiment, 6 branch pipes 32 are provided, the top end of the casing 1 is sealed by the sealing plate 101 (the passage between the 6 branch pipes and the top end of the casing 1 is sealed), the 6 branch pipes pass through the sealing plate 101 to feed the refrigerant into the mixing cavity 6, the outlet of the 6 branch pipes is provided with 6 distributors 33, each distributor 33 circumferentially surrounds the top end of the mixing cavity 6, each distributor 33 is provided with a plurality of uniformly distributed through holes 331, the distributors 33 can form 6 equal circular distribution areas, the distribution area of the whole heat exchange mechanism 2 (heat exchange spiral coil pipe) is included, and the refrigerant enters the evaporation and refrigeration area in each spiral coil pipe after being equalized in the top cavity. Guarantee to be located the distributor in mixing chamber 6 and send into mixing chamber 6 with the refrigerant uniformly, if when the refrigerant is freon, in the refrigerant flow equalizer 3 made the refrigerant flow equalizing in mixing chamber 6 get into the heat exchange tube refrigeration district, freon that flow equalizer 3 sent into can evenly distributed to every heat exchange tube 201, makes every heat exchange tube 201 all filled the refrigerant and can carry out the heat transfer.

As shown in fig. 4, the heat exchange mechanism of the present invention is vertically distributed in the casing 1, the heat exchange mechanism 2 of the present invention comprises a plurality of layers of heat exchange units 20 distributed in layers around the longitudinal center line O, each layer of heat exchange unit is composed of a plurality of heat exchange tubes 201; the heat exchange tubes 201 in the adjacent heat exchange units 20 are spiral around the longitudinal central line O in opposite directions, that is, the heat exchange mechanism 2 is composed of a plurality of layers of spiral coils, the innermost heat exchange unit is spiral around the support mechanism 7, then, from inside to outside, the adjacent spiral coil layers sequentially pass through the left-handed spiral coil and the right-handed spiral coil to form heat exchange tubes in opposite directions, the heat exchange mechanism 2 is uniformly and hierarchically wound in the shell in the opposite spiral direction by a plurality of spiral flow line structures to form a refrigerant heat exchange refrigeration area, the refrigerant from top to bottom flows in the heat exchange tubes in spiral flow lines, the disturbance of the fluid is increased, and the heat exchange is uniform and sufficient; meanwhile, the lubricating oil in the refrigerant can be completely taken away, the problem of unsmooth oil return is avoided, the normal operation of the compressor is facilitated, and the service life of the compressor is prolonged. As shown in fig. 5 and 6, fig. 5 shows a structure of one layer of heat exchange unit 20 in the heat exchange mechanism 2, fig. 6 shows another structure of the heat exchange unit 20 located at the outer layer of the heat exchange unit, and the spiral directions of the heat exchange units 20 of two adjacent layers are opposite.

Further, in this embodiment, the upper end of the heat exchange tube 201 is a first pipeline 2011 of a straight tube section, the first pipeline 2011 extends to the height of the inlet (the first air inlet 103) of the VOCs, and is lower than the second pipeline 2012 which is spiral below the air inlet tube, and the long and straight first pipeline 2011 can effectively and evenly distribute the fluid in the tube, so that the refrigerant fed from the inside of the shell sufficiently participates in heat exchange, and the resistance loss is reduced. The section of the heat exchange tube 201 lower than the first air inlet 103 is selected to be a spiral coil, and each heat exchange tube 201 is uniformly wound on the supporting mechanism 7 in layers in a spiral flow line structure and is arranged in the shell. The Freon refrigerant flows into the spiral heat exchange tube from the upper flow equalizer 3, the spiral heat exchange tube forms a refrigerant heat exchange condensation channel, the refrigerant flows into the spiral tube after being equalized by the flow equalizer at the upper end, the expanded low-temperature refrigerant is evaporated in the spiral tube, the evaporation needs to absorb heat to form the cooling treatment of the gas outside the tube, and the refrigerant which is changed into a gaseous state after being evaporated flows out of the fluorine outlet tube; the number of the spiral pipes is matched according to the concentration and the load of the gas and can be adjusted according to the requirement. After sufficient heat exchange and evaporation into a gaseous state, the gaseous refrigerant flows out through the bottom refrigerant outflow pipe 106. The flow state of the VOCs gas is changed immediately after the flow equalization is performed through the straight-tube first pipeline 2011 from the first gas inlet 103, a strong turbulent flow state is formed in the shell for efficient heat exchange, the VOCs gas is gradually condensed out from top to bottom, the VOCs gas is thrown onto the inner wall of the shell under the action of spiral linear force, liquid oil is fully condensed and separated out, liquid drops flow onto the lower tube plate 5 along the wall, in order to avoid the liquid drops flowing out along the exhaust tube, as shown in fig. 7, in order to avoid the liquid drops flowing out along the exhaust tube, a baffle 1041 with a certain height is arranged at the bottom end of the first gas outlet 104 for blocking, the baffle 1041 inclines towards the shell 1 from the bottom end of the first gas outlet 104, the inclination angle is beta, the baffle 1041 covers the opening of the first gas outlet 1041 in height, but due to the inclined arrangement of the baffle 1041, the gas is completely discharged out through the gap between the baffle 1041 and the first gas outlet 104, and no liquid oil is sent out, no dead angle and no residue, the condensed oil flows out from the lower oil outlet pipe 105, and the separated VOCs gas flows out from the gas outlet pipe.

Further, the utility model provides a lower tube sheet 5 adopts ramp structural design, forms a slope towards play oil pipe 105 opening direction for the condensate oil gets into from the liquid outlet outside the oil pipe flow to the heat exchanger of flowing out, does not flow out from the condensate with the help of mechanical external force down.

In the specific application, the heat exchange tube 201 in the heat exchange mechanism 2 is made of stainless steel 316L or titanium steel, the heat exchange tube 201, the upper tube plate 4 and the lower tube plate 5 are welded firstly and then expanded, the lower end of the shell 1 is in an end enclosure form, so that the Freon refrigerating system can withstand pressure of more than 3MPa, and the sealing plate 101 and the shell 1 are in double-sided V-shaped fillet welding to ensure that the welding position is zero leakage under the conditions of large temperature difference mutation and high pressure.

A first gas inlet 103 for feeding the VOCs gas is arranged above the heat exchange cavity 100, a first gas outlet 104 for feeding the VOCs gas is arranged below the heat exchange cavity 100, and in the embodiment, the first gas inlet 103 and the second gas outlet 104 are both openings on the upper side of the shell 1; shell 1 below is provided with head 102, is provided with the oil outlet pipe 105 that is used for the condensate liquid to send out in heat transfer chamber 100 below, specifically, oil outlet pipe 105 is located shell 1 opening in the side of shell 1, is located the position of tube sheet 5 top down, and shell 1 bottom is provided with the refrigerant outflow pipe 106 of vertical extension, and the refrigerant is after the heat transfer, after getting into the cavity between tube sheet 5 and the head 102 down, sends out shell 1 through refrigerant outflow pipe 106 afterwards, and refrigerant outflow pipe 106 constitutes the runner of the gaseous condensate liquid after the liquid is divided in the condensation of VOCs.

It should be noted that the support mechanism 7 in this embodiment includes a support pipe 72 located at the middle section, and a support rod 71 connected to the upper pipe plate and located at the upper end of the support pipe 72.

The utility model discloses a working method for gaseous heat transfer device of condensation VOCs, including following step:

(a) high-concentration high-temperature VOCs gas enters the shell 1 from the first gas inlet 103, the VOCs gas entering the heat exchange cavity 100 from the upper side part of the shell 1 spirally downwards along the heat exchange mechanism 2 to exchange heat with low-temperature refrigerant in the spiral heat exchange pipe, the temperature of the VOCs gas is gradually reduced by the low-temperature refrigerant, the heat release temperature of the gas is reduced, condensed oil is separated, and the purified clean VOCs gas is discharged from the first gas outlet 104;

(b) part of the components of VOCs in the high-concentration VOCs gas are separated out in a liquid state, the components are separated from the VOCs gas under the action of spiral centrifugal force, liquid oil condensed and separated by the spiral heat exchange mechanism 2 flows out quickly through a lower tube plate of the slope oil outlet pipe under the action of gravity, and automatically flows out through the oil outlet pipe 105, so that condensed oil separation is completed, the heat exchange pipe is spiral downward, and lubricating oil is stored without dead corners;

(c) after the heat exchange of the refrigerant in the heat exchange tube 201, the refrigerant flows into the end enclosure 104 through the lower tube plate 5 and then flows out through the refrigerant outflow tube 106.

The utility model has the advantages that the spiral pipe is arranged as the heat exchange pipe, the Freon forms a spiral turbulent flow state in the pipe, the stress change caused by large temperature difference mutation can be eliminated, the lubricating oil in the refrigerating system can be smoothly taken out of the heat exchanger through the flow direction from top to bottom, and the problem of difficult low-temperature oil return of the compressor is solved; VOCs gas enters the shell pass cavity from the upper side gas inlet pipe, the VOCs gas spirally downwards along the heat exchange pipe bundle in the cavity, liquid oil products are condensed and separated in a low-temperature plant, and purified clean VOCs gas is discharged from the gas outlet pipe; the liquid oil separated by spiral condensation automatically flows out through the oil outlet pipe under the action of gravity, so that the purpose of condensing and separating oil is fulfilled, the lower pipe plate is designed as a ramp, and the oil outlet pipe is designed for preventing liquid flow by welding a first gas outlet in a staggered layer; the utility model discloses a indirect heating equipment compact structure, sulfur-resistant corruption, the condensate liquid can flow out automatically, guarantees the two kinds of fluids high-efficient heat transfer in same indirect heating equipment of big difference in temperature, flows out automatically after the gas side condensation (divide liquid), and the fluorine side is also top-down to flow out and is not the trapped fuel. The device can be widely applied to VOCs recovery processing devices in industries such as automobile loading, train loading, wharf loading, storage and transportation tank areas, bio-pharmaceuticals and the like.

Claims (9)

1. A heat exchange device for condensing VOCs gas is characterized by comprising a vertically arranged shell (1) and a heat exchange mechanism (2) arranged in the shell (1); the heat exchanger is characterized in that a flow equalizer (3) for uniformly feeding a refrigerant into a heat exchange mechanism is arranged at the upper end of the shell (1), an upper tube plate (4) and a lower tube plate (5) for fixing the heat exchange mechanism (2) are arranged in the shell (1), a heat exchange cavity (100) is formed between the upper tube plate (4) and the lower tube plate (5), the heat exchange mechanism (2) comprises a plurality of layers of heat exchange units (20) which are distributed in a layered manner around a longitudinal central line (O), and each layer of heat exchange unit (20) consists of a plurality of heat exchange tubes (201); the heat exchange tubes (201) in the adjacent heat exchange units (20) are spiral towards the opposite direction.

2. A heat exchange device for condensing VOCs gases according to claim 1, wherein said heat exchange tubes (201) comprise first long straight tubes (2011) fixed to the upper tube sheet (4) and second spiral tubes (2012) communicating with said first tubes (2011), said second tubes (2012) being fixed at their lower end to the lower tube sheet (5).

3. A heat exchange device for condensing VOCs gases according to claim 1, wherein the upper tube plate (4) and the upper end of the shell (1) form a mixing chamber (6) for mixing refrigerants, the flow equalizer (3) sends the refrigerants into the mixing chamber (6) for mixing, and the refrigerant inlet of the heat exchange tube (201) is communicated with the mixing chamber (6).

4. The heat exchange device for condensing VOCs gas as claimed in claim 3, wherein said flow equalizer (3) comprises a main pipe (31), a plurality of branch pipes (32) connected to the outlet of said main pipe, and a plurality of distributors (33) connected to the outlets of said plurality of branch pipes (32), said plurality of distributors (33) being uniformly and circumferentially distributed at the top end of said mixing chamber (6).

5. A heat exchange device for condensing VOCs gases according to claim 1, wherein a support mechanism (7) is provided in the middle of the heat exchange chamber of the housing (1), and a heat exchange unit (20) adjacent to the support mechanism (7) is fixed around the support mechanism (7).

6. A heat exchange device for condensing VOCs gases according to claim 1, wherein a sealing plate (101) is provided at the top end of the housing (1) and a sealing head (102) is provided at the bottom end of the housing (1).

7. A heat exchange device for condensing VOCs gases according to claim 1, wherein a first gas inlet (103) for feeding VOCs gases is provided above the heat exchange chamber (100), and a first gas outlet (104) for feeding VOCs gases is provided below the heat exchange chamber (100).

8. A heat exchange device for condensing VOCs gases according to claim 1, wherein an oil outlet pipe (105) for sending out condensed liquid is provided below the heat exchange chamber (100), and a vertically extending refrigerant outlet pipe (106) is provided at the bottom end of the shell (1).

9. A heat exchange unit for condensing VOCs gases according to claim 5, characterised in that the support means (7) comprises a support tube (72) in the middle section and a support bar (71) connected to the upper tube plate at the upper end of the support tube (72).

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