CN107144159B - Spiral plate double dryness split flow heat exchange evaporator - Google Patents

Abstract

A spiral plate type double-dryness fraction heat exchange evaporator comprises a spiral high-temperature heat exchange plate and a spiral double-dryness fraction heat exchange plate, wherein the spiral high-temperature heat exchange plate and the spiral double-dryness fraction heat exchange plate alternately extend in a spiral manner from the center to the outer diameter; the spiral double-dryness-degree flow dividing heat exchange plate is provided with more than one double-dryness-degree flow divider, more than one group of double-dryness-degree flow passage groups are formed by matching a high-dryness-degree flow passage and a low-dryness-degree flow passage in a vertical and parallel mode, the double-dryness-degree flow dividers are arranged between the two double-dryness-degree flow passage groups corresponding to the head and the tail, the high-dryness-degree flow passage and the low-dryness-degree flow passage in the upper group of double-dryness-degree flow passage groups are respectively communicated with a flow dividing inner cavity in the double-dryness-degree flow divider and the high-dryness-degree flow passage in the lower group of double-dryness-degree flow passage groups, and the low-dryness-degree flow passage in the lower group of double-dryness-degree flow passage groups is communicated with a flow dividing inner cavity in the double-degree flow dividers. The invention has the characteristics of excellent performance, small volume, good heat exchange effect, energy saving, environmental protection, low manufacturing cost, easy production, easy realization, safety, reliability and strong practicability.

Description

Spiral plate double dryness split flow heat exchange evaporator

technical field

The invention relates to an evaporator, in particular to a spiral plate type double dryness split flow heat exchange evaporator.

Background technique

Spiral plate evaporator is a high-efficiency heat exchanger equipment, which is suitable for chemical, petroleum, solvent, pharmaceutical, pharmaceutical, light industry, textile, metallurgy, steel rolling, coking and other industries. Strong reliability, high heat transfer efficiency, large heat transfer area, low resistance, not easy to scale, and can be used in combination with multiple units, so it has been widely used in industries. However, the traditional spiral plate evaporator generally has the following defects: the heat transfer efficiency of low-quality evaporation is not high during the liquid evaporation heat transfer process, and the flow rate of the working medium in the later process of the evaporation process increases, and the shear force of the gas-liquid phase interface increases. , resulting in a significant increase in pressure drop. Chinese Patent Document No. CN202660739U disclosed a high-efficiency coil-type oil-water heat exchange evaporator on January 9, 2013. It specifically discloses a cylinder and a coil, and the coil is an inner spiral coil and an outer spiral coil. It consists of double coils, the double coils are set inside the vertical cylinder, the upper part of the cylinder is equipped with a water level gauge and safety valve, the top of the cylinder is equipped with a manhole device, the lower part of the cylinder is equipped with a drain valve, and the inner and outer spiral coils The inlet and outlet are connected to the heat conduction oil pipe, and the bottom of the cylinder is connected to the water supply device. This structure has the above-mentioned problems, therefore, it is necessary to make further improvements to the prior art.

Contents of the invention

The purpose of the present invention is to provide a spiral plate type double dryness shunt with simple and reasonable structure, excellent performance, small volume, good heat exchange effect, energy saving and environmental protection, low manufacturing cost, easy production, easy realization, safety, reliability and strong practicability A heat exchange evaporator overcomes the deficiencies in the prior art.

A spiral plate type double dryness split flow heat exchange evaporator designed according to this purpose, including a spiral high temperature heat exchange plate and a spiral double dryness split flow heat exchange plate, the spiral high temperature heat exchange plate and the spiral double dryness split flow heat exchange plate Alternately extend radially from the center to the outside; the inlet end of the spiral high-temperature heat exchange plate is connected with a high-temperature working medium inlet pipe, and the outlet end of the spiral high-temperature heat exchange plate is connected with a high-temperature working medium outlet pipe; the spiral double dryness splitter The inlet end of the heat plate is connected with an evaporating working medium inlet pipe, and the outlet end of the spiral double-quality split heat exchange plate is connected with an evaporating working medium outlet pipe; The above double dryness splitters, and more than one set of double dryness flow channel groups composed of high dryness flow channels and low dryness flow channels arranged side by side. Between the channel groups, the high dryness flow channel and the low dryness flow channel in the last set of double dryness flow channel groups are respectively connected to the split flow cavity in the double dryness flow divider and the next set of double dryness flow channel groups. The high dryness flow passages in the next group of double dryness flow passages are connected to the split cavity in the double dryness flow divider.

The high dryness flow channel and the low dryness flow channel are respectively provided with a number of groove stripes, and the adjacent two groove stripes are arranged side by side in a spaced manner. The groove stripes on the high dryness flow channel and the groove stripes on the low dryness flow channel The groove stripes correspond to each other and communicate with each other.

The inclination a of the groove stripes is 15°-75°; a middle partition is arranged between the high dryness flow channel and the low dryness flow channel, and a number of liquid replenishment holes are arranged on the middle partition, and a number of liquid replenishment holes Arranged along the flow direction of the evaporating working fluid, and the area gradually increases.

The double dryness flow divider is provided with a hard filter screen, and the high dryness flow channel and the low dryness flow channel in the upper set of double dryness flow channel groups are respectively connected to the inner cavity of the flow through the hard filter screen, and the hard filter screen There are several through holes on the net.

The diameter d of the through hole is 0.5-5 mm.

The double dryness splitter includes a substantially vertical distribution groove and a distribution extension plate arranged at the notch of the distribution groove, the notch of the distribution groove is jointly closed by a hard filter screen and a distribution extension plate, and The inner side of the groove forms a flow-distributing inner cavity.

The distribution extension plate is provided with a distribution gap corresponding to the low dryness flow channel in the next group of double dryness flow channels, and the low dryness flow channel communicates with the distribution cavity through the distribution gap.

The high-temperature working medium inlet pipe extends radially outward at the end of the spiral high-temperature heat exchange plate; the evaporating working medium outlet pipe extends radially outward at the end of the spiral double-quality split heat exchange plate; the high-temperature working medium The substance outlet pipe extends downwards at the end of the spiral high-temperature heat exchange plate; the evaporation working medium inlet pipe extends downwards at the end of the spiral double-quality split flow heat exchange plate.

Through the improvement of the above-mentioned structure, the present invention can realize the high-efficiency heat exchange zone of high-quality nucleate boiling in advance in the high-quality flow channels of the spiral double-quality heat exchange plates in each section, thereby improving the overall heat exchange efficiency and reducing resistance pressure drop. Compared with the prior art, the beneficial technical effect of the present invention is: based on the principle of evaporative heat transfer, in the evaporation process of the working medium of the spiral plate evaporator, the method of "high and low dryness split heat exchange" is used to evaporate, and the low dryness The heat exchange efficiency is maintained by the high dryness flow, and the heat exchange is enhanced by the high dryness flow, thereby improving the overall heat exchange efficiency of the evaporator; the shear force of the gas-liquid interface in the two-phase fluid is weakened by the split flow of the high and low dryness fluid, and the tube is reduced. side pressure drop, and ultimately reduce the volume of the evaporator, saving consumables and energy. In general, it has the characteristics of simple and reasonable structure, excellent performance, small size, good heat exchange effect, energy saving and environmental protection, low manufacturing cost, easy production, easy realization, safety and reliability, and strong practicability.

Description of drawings

Fig. 1 is a top view of an embodiment of the present invention;

Fig. 2 is the sectional view of A-A direction in Fig. 1;

Figure 3 and Figure 4 are partial enlarged schematic diagrams of different orientations of an embodiment of the present invention;

Fig. 5 is a schematic structural view of a hard filter screen in an embodiment of the present invention;

Fig. 6 is the sectional view of B-B direction in Fig. 5;

Fig. 7 is a cross-sectional view of a double dryness runner group in an embodiment of the present invention;

Fig. 8 is a sectional view of C-C direction in Fig. 7;

Fig. 9 is a cross-sectional view of a spiral high-temperature heat exchange plate in an embodiment of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1-9, the spiral plate type double dryness diversion heat exchange evaporator includes spiral high temperature heat exchange plate 1 and spiral double dryness split heat exchange plate 2, spiral high temperature heat exchange plate 1 and spiral double dryness split heat exchange plate The plates 2 alternately extend radially from the center to the outside; the inlet end of the spiral high-temperature heat exchange plate 1 is connected with a high-temperature working medium inlet pipe 3, and the outlet end of the spiral high-temperature heat exchange plate 1 is connected with a high-temperature working medium outlet pipe 3' ; The inlet end of the spiral double-quality split heat exchange plate 2 is connected to the evaporating working medium inlet pipe 4, and the outlet end of the spiral double-quality split heat exchange plate 2 is connected to the evaporating working medium outlet pipe 4'; wherein, the spiral double dry degree The side wall of the diverter heat exchange plate 2 is provided with more than one double dryness flow divider 5, and the inner side is provided with more than one set of double dryness flow channel groups composed of high dryness flow channels 6 and low dryness flow channels 7 arranged side by side; The dryness flow divider 5 is set between the two double dryness flow channel groups corresponding to the head and tail, and the high dryness flow channel 6 and the low dryness flow channel 7 in the previous set of double dryness flow channel groups are respectively connected to the double dryness flow channel The splitter inner cavity 5.3 in the device 5 and the high dryness flow channel 6 in the next set of double dryness flow channel groups, and the low dryness flow channel 7 in the next set of double dryness flow channel groups are connected to the double dryness flow divider 5 within the shunt lumen 5.3. This structure enables the efficient heat exchange zone of high-quality nucleate boiling to be realized in advance in the high-quality flow channel in the double-quality split heat exchange plate, thereby improving the overall heat transfer efficiency and reducing the resistance pressure drop; in addition, this structure In the evaporation process of the working fluid, it evaporates in the way of "high and low dryness split heat exchange", the low dryness flow maintains the heat exchange efficiency, and the high dryness flow strengthens the heat transfer, thereby improving the overall heat exchange efficiency of the evaporator; The dryness splitter 5 divides the flow of high and low dryness fluids, weakens the shear force of the gas-liquid interface in the two-phase fluid, reduces the resistance pressure drop on the tube side, and finally reduces the volume of the evaporator, saving consumables and energy ; It has beneficial effects such as excellent performance, small size, good heat exchange effect, energy saving and environmental protection, low manufacturing cost, easy production, easy realization, safety and reliability, and strong practicability.

Furthermore, the inner wall of the high dryness flow channel 6 and the inner wall of the low dryness flow channel 7 are respectively inclined with a number of groove stripes 11.1. Convex groove stripes 11.2 must be formed, and the groove stripes 11.1 on the high dryness flow channel 6 correspond to the groove stripes 11.1 on the low dryness flow channel 7 one-to-one, and are connected to each other; the working fluid in the low dryness flow channel 7 During the heat exchange process, liquid can be automatically replenished to the high dryness flow channel 6 through the groove stripes 11.1 to prevent the high dryness flow channel 6 from being short of liquid.

Further, referring to Fig. 7, the inclination a of the groove stripes 11.1 is 15°-75°; referring to Fig. 8, an intermediate partition 8 is arranged between the high dryness flow channel 6 and the low dryness flow channel 7, and the middle partition The plate 8 is provided with a number of replenishment holes 8.1, and the plurality of replenishment holes 8.1 are arranged along the flow direction of the evaporating working medium, and the area gradually increases.

Furthermore, the double dryness flow divider 5 is provided with a hard filter screen 5.2, and the high dryness flow channel 6 and the low dryness flow channel 7 in the upper set of double dryness flow channel groups are respectively connected and divided through the hard filter screen 5.2 The inner cavity 5.3 and the hard filter screen 5.2 are provided with several through holes 5.21, and the diameter d of the through holes 5.21 is 0.5-5mm.

Further, referring to Fig. 3 and Fig. 4, the double dryness splitter 5 includes a substantially vertical distribution groove 5.1 and a distribution extension plate 9 arranged at the notch of the distribution groove 5.1, and the notch of the distribution groove 5.1 is formed by a hard The mass filter 5.2 and the distribution extension plate 9 are closed together, and a distribution cavity 5.3 is formed inside the groove 5.1. Specifically, the front side of the splitter extension plate 9 is connected to the end of the hard filter screen 5.2, and the rear side is only connected to the high dryness flow channel 6 in the next group of double dryness flow channel groups; The actual height arrangement of heat exchange plates in each layer.

Furthermore, the distribution extension plate 9 is provided with a distribution gap 10 corresponding to the low dryness flow channel 7 in the next group of double dryness flow channels, and the low dryness flow channel 7 communicates with the distribution cavity 5.3 through the distribution gap 10 . Specifically, the distribution gap 10 is located at the lower part of the outlet side of the distribution groove 5.1, and the range of the distribution gap 10 is from the low-quality flow channel 7 contained in the distribution groove 5.1 to the middle partition 8, forming a triangular-shaped gap.

Furthermore, the high-temperature working medium inlet pipe 3 extends radially outward at the end of the spiral high-temperature heat exchange plate 1; the evaporating working medium outlet pipe 4' extends radially outward at the end of the spiral double-quality split-flow heat exchange plate 2 ; The high-temperature working medium outlet pipe 3' extends downward to the end of the spiral high-temperature heat exchange plate 1; That is, the high-temperature working medium inlet pipe 3 and the evaporating working medium outlet pipe 4' respectively extend outward on the outer wall of the spiral plate type double dryness split heat exchange evaporator, and the high-temperature working medium outlet pipe 3' and the evaporating working medium inlet pipe 4 They respectively extend downward at the bottom center of the spiral plate type double dryness split heat exchange evaporator.

Specific working principle:

The evaporating working medium enters the spiral double-quality split heat exchange plate 2 from the evaporating working medium inlet pipe 4, and the high-temperature fluid enters the spiral high-temperature heat exchange plate 1 from the high-temperature working medium inlet pipe 3; the evaporating working medium enters the spiral double-quality heat exchange plate 2 Heat exchange to form a two-phase working medium with a certain dryness, and then through the double dryness splitter 5 for double dryness splitting, the high dryness flow enters the subsequent high dryness flow channel 6, and the low dryness flow enters the subsequent low dryness flow channel 6 High-density flow channel 7; the centrifugal shunting process of the double dryness flow divider 5 is as follows: the two-phase fluid with low dryness passes through the surface of the hard filter screen 5.2, and due to the effect of centrifugal force, the liquid in the two-phase fluid is close to the flow channel wall The gas-phase working medium is on the outside of the flow channel wall, so most of the liquid-phase working medium passes through the through hole 5.21 and enters the split cavity 5.3 under centrifugal action, and finally flows out from the split gap 10 and enters the subsequent low flow channel. The dryness flow channel 7 performs heat exchange; while a small amount of liquid and high dryness fluid that pass through the surface of the hard filter 5.2 are diverted by the diverter extension plate 9 respectively, and then enter the subsequent high dryness flow channel 6 for heat exchange ; Since the inner walls of the high dryness flow channel 6 and the low dryness flow channel 7 are provided with groove stripes 11.1, part of the liquid-phase working medium in the low dryness flow channel 7 will be drained by the groove stripes 11.1. The water is drained along the groove channel 11.1 and passes through the corresponding liquid replenishment hole 8.1, and then enters the high dryness flow channel 6 for liquid replenishment. Therefore, under the action of the groove stripes 11.1 and the liquid replenishment hole 8.1, the low dryness flow channel 7 The working fluid can automatically replenish liquid to the high dryness flow channel 6 during the heat exchange process to prevent the high dryness flow channel 6 from being short of liquid. In addition, the drainage effect of the groove stripes 11.1 interacts with the gravity of the working fluid itself , can also improve the uniformity of the working fluid in the spiral high temperature heat exchange plate 1 and the spiral double dryness split heat exchange plate 2. The subsequent heat exchange plate section of the evaporator repeats the above split heat exchange process until the evaporating working medium is completely evaporated, and finally the gaseous evaporating working medium flows out from the evaporating working medium outlet pipe 4', and the high-temperature fluid flows out from the high-temperature working medium outlet pipe 3 'Outflow, and finally realized the whole process of high and low double dryness evaporation enhanced heat transfer mechanism of evaporating liquid, its heat transfer efficiency will be significantly improved, and the resistance pressure drop will be significantly reduced.

The above is the preferred solution of the present invention, showing and describing the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principle of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A spiral plate type double-dryness fraction heat exchange evaporator comprises a spiral high-temperature heat exchange plate (1) and a spiral double-dryness fraction heat exchange plate (2), wherein the spiral high-temperature heat exchange plate (1) and the spiral double-dryness fraction heat exchange plate (2) alternately extend in a spiral manner from the center to the outside in the radial direction; the inlet end of the spiral high-temperature heat exchange plate (1) is communicated with a high-temperature working medium inlet pipe (3), and the outlet end of the spiral high-temperature heat exchange plate (1) is communicated with a high-temperature working medium outlet pipe (3'); the inlet end of the spiral double-dryness shunting heat exchange plate (2) is communicated with an evaporation working medium inlet pipe (4), and the outlet end of the spiral double-dryness shunting heat exchange plate (2) is communicated with an evaporation working medium outlet pipe (4'); the method is characterized in that: the spiral double-dryness flow dividing heat exchange plate (2) is provided with more than one double-dryness flow divider (5) and more than one group of double-dryness flow channel groups formed by matching a high-dryness flow channel (6) and a low-dryness flow channel (7) up and down side by side, the double-dryness flow divider (5) is arranged between the two double-dryness flow channel groups corresponding from head to tail, the high-dryness flow channel (6) and the low-dryness flow channel (7) in the upper group of double-dryness flow channel groups are respectively communicated with a flow dividing inner cavity (5.3) in the double-dryness flow divider (5) and the high-dryness flow channel (6) in the lower group of double-dryness flow channel groups, and the low-dryness flow channel (7) in the lower group of double-dryness flow channel groups is communicated with a flow dividing inner cavity (5.3) in the double-dryness flow divider (5);

the high-dryness runner (6) and the low-dryness runner (7) are respectively provided with a plurality of groove stripes (11.1) in an inclined manner, two adjacent groove stripes (11.1) are arranged side by side at intervals, and the groove stripes (11.1) on the high-dryness runner (6) and the groove stripes (11.1) on the low-dryness runner (7) are in one-to-one correspondence and are communicated with each other;

a middle partition plate (8) is arranged between the high-dryness flow channel (6) and the low-dryness flow channel (7), a plurality of liquid supplementing holes (8.1) are formed in the middle partition plate (8), the liquid supplementing holes (8.1) are distributed along the flowing direction of the evaporation working medium, and the area of the liquid supplementing holes is gradually increased;

the double-dryness flow divider (5) is provided with a hard filter screen (5.2), a high-dryness flow channel (6) and a low-dryness flow channel (7) in the upper double-dryness flow channel group are respectively communicated with a flow dividing inner cavity (5.3) through the hard filter screen (5.2), and the hard filter screen (5.2) is provided with a plurality of through holes (5.21);

the double-dryness flow divider (5) comprises a flow dividing groove (5.1) which is basically vertically arranged and a flow dividing extension plate (9) which is arranged at the notch of the flow dividing groove (5.1), the notch of the flow dividing groove (5.1) is jointly sealed by a hard filter screen (5.2) and the flow dividing extension plate (9), and a flow dividing inner cavity (5.3) is formed at the inner side of the groove (5.1);

the diversion extension plate (9) is provided with a diversion gap (10) corresponding to the low-dryness runner (7) in the next double-dryness runner group, and the low-dryness runner (7) is communicated with a diversion inner cavity (5.3) through the diversion gap (10);

the front side of the flow dividing extension plate (9) is connected with the tail end of the hard filter screen (5.2), and the rear side is only connected with the high-dryness flow channel (6) in the next double-dryness flow channel group; the double-dryness flow divider (5) is arranged according to the actual height of each layer of heat exchange plate.

2. The spiral plate type double-dryness fraction heat-exchanging evaporator as recited in claim 1, wherein: the inclination a of the groove strips (11.1) is 15-75 degrees.

3. The spiral plate type dual dryness fraction heat exchange evaporator according to claim 1, wherein: the aperture d of the through hole (5.21) is 0.5-5mm.

4. A spiral plate type double-dryness fraction heat-exchanging evaporator according to any one of claims 1 to 3, wherein: the high-temperature working medium inlet pipe (3) extends outwards in the radial direction to the end part of the spiral high-temperature heat exchange plate (1); the evaporation working medium outlet pipe (4') extends outwards in the radial direction to the end part of the spiral double-dryness flow-dividing heat exchange plate (2); the high-temperature working medium outlet pipe (3') extends downwards to the end part of the spiral high-temperature heat exchange plate (1); and the evaporation working medium inlet pipe (4) extends downwards to the end part of the spiral double-dryness flow-dividing heat exchange plate (2).

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