Self-sealing indirect heat exchange device for desulfurization slurry recovery

Abstract

A self-sealing indirect heat exchange device used for desulfurization slurry recovery comprises a heat exchange cavity, at least two heat exchange units arranged from top to bottom are arranged in the heat exchange cavity, each heat exchange unit comprises a leading-in pipe, a steam space is arranged at the bottom of each leading-in pipe, and the steam space is communicated with the leading-in pipe. An outlet of the ingress pipe is opposite to an inlet of the ingress pipe of the lower heat exchange unit; a cooling heat exchanger is arranged at the side part of the ingress pipe; and a demister is arranged between the cooling heat exchanger and the steam space. The guide-in pipe in the middle is adopted for guiding out, a liquid column between the two guide-in pipes which are arranged up and down is formed during guiding out, then relatively clean steam can be formed in the steam space, the steam is cooled in the cooling heat exchanger, and therefore relatively effective cooling heat exchange can be conducted on the premise that corrosion is avoided as much as possible, and the heat exchange efficiency is improved. Therefore, cooling and heat recovery of the desulfurization slurry are completed.

Description

TECHNICAL FIELD

[0001] The application relates to a self-sealing indirect heat exchange device for desulfurization slurry recovery. BACKGROUND

[0002] Due to the complex composition of the desulfurization slurry, corrosion and blockage, the desulfurization slurry cannot be directly exchanged by a heat exchanger to recover heat, and the flash evaporation method is usually used at present. However, the effect of the flash evaporation treatment is not good, and the flash evaporation and the heat exchange part need to be separately arranged, so that the overall manufacturing cost is relatively high, and the overall equipment occupies a large area. Therefore, it is necessary to improve the heat exchange structure of the existing flash evaporation form, and the main improvement directions are two, one is to integrally arrange the flash evaporation and the heat exchange part, and the other is to optimize the flow direction of the desulfurization slurry to improve the material exchange and energy exchange rate. SUMMARY

[0003] In order to solve the above problems, the application provides a self-sealing indirect heat exchange device for desulfurization slurry recovery, which comprises a heat exchange cavity, and not less than two heat exchange units arranged from top to bottom in the heat exchange cavity. The heat exchange unit comprises an inlet pipe, a steam space is arranged at the bottom of the inlet pipe, and the outlet of the inlet pipe is arranged opposite to the inlet of the inlet pipe of the lower heat exchange unit. A cooling heat exchanger is arranged on the side of the inlet pipe, and a demister is arranged between the cooling heat exchanger and the steam space. In the application, the middle inlet pipe is used for outlet, and the liquid column between the two upper and lower arranged inlet pipes is formed during the outlet, and then relatively clean steam can be formed in the steam space. The steam is cooled in the cooling heat exchanger, so that relatively effective cooling and heat exchange can be carried out under the premise of avoiding corrosion as much as possible, so as to complete the cooling and heat recovery of the desulfurization slurry.

[0004] Preferably, the inlet pipe comprises a necked section, and a falling water section is arranged below the necked section; and the cross-sectional area of the necked section is arranged in a tapering manner from top to bottom.

[0005] Preferably, the necked section is a conical frustum, the top diameter of the necked section is D, the bottom diameter is d, the height of the falling water section is H, and the angle between the generatrix of the necked section and the top surface of the necked section is alpha; wherein 1.2d≤D≤1.4d, 45°≤alpha≤75°, and H / d≥2. The inlet pipe of the application adopts a pipeline tapering inlet pipe, the axes of the relatively arranged inlet pipes are arranged in coincidence, and the length is arranged, so that the slurry can complete rectification in the falling water section, and directly enter the corresponding inlet pipe at the bottom after being sprayed from the falling water section; the dispersed effect of the slurry sprayed after rectification is small, most of the slurry enters the straight pipe section of the second effect, and only a small amount of slurry at the edge of the dispersed liquid column collides with the necked section to form water mist, which can be smoothly guided into the next heat exchange unit.

[0006] Preferably, the drain section is a circular pipe, and the drain section is flush with the bottom of the constricted section.

[0007] Preferably, the middle axes of the inlet pipes of the upper and lower heat exchange units are aligned.

[0008] Preferably, the water drop section extends to the lower part of the corresponding demister; The demister is a wire mesh demister.

[0009] Preferably, a guide plate is provided at the top of the constricted section, and the side of the guide plate is sealed and fixed to the inner wall of the heat exchange cavity; a plurality of inlet pipes are provided on one guide plate, the inlet pipes are spaced apart, and a serpentine heat exchange tube is provided in the space between the inlet pipes to form a cooling heat exchanger; an inlet header connected to the refrigerant inlet pipe is provided on one side of the serpentine heat exchange tube, and an outlet header connected to the refrigerant outlet pipe is provided on the other side. This application uses serpentine tubes in combination with inlet pipes arranged in an equilateral triangle shape, which can arrange multiple inlet pipes in the same layer, thereby allowing multiple liquid columns to exist in a limited space, significantly increasing the total evaporation area and improving the heat exchange power.

[0010] Preferably, the inlet tubes are arranged in an equilateral triangle pattern; the bottom diameter d is 20-200mm; and the distance between adjacent inlet tubes is not less than 2d.

[0011] Preferably, the diameter of the serpentine heat exchange tube is 20-65mm, and the distance between the pipes inside the serpentine heat exchange tube is 1.2-2 times the pipe diameter.

[0012] Preferably, an inlet space is provided at the top of the heat exchange unit of the heat exchange cavity, and an inlet is provided at the position of the heat exchange cavity corresponding to the position of the heat exchange cavity; an outlet space is provided at the bottom of the heat exchange unit of the heat exchange cavity, and an outlet is provided at the position of the heat exchange cavity corresponding to the position of the heat exchange cavity.

[0013] This application can bring the following beneficial effects: 1. This application uses a central inlet pipe for discharge, which forms a liquid column between two upper and lower inlet pipes at the same time. This allows for the formation of relatively clean steam in the steam space. The steam is cooled in the cooling heat exchanger, thus achieving relatively effective cooling and heat exchange while minimizing corrosion, thereby completing the cooling of the desulfurization slurry and heat recovery.

[0014] 2. The inlet pipe of this application adopts a tapered inlet pipe with the axis of the relatively set inlet pipe coinciding. In addition, the length setting allows the slurry to be rectified in the drop section and directly enter the corresponding inlet pipe at the bottom after being sprayed out from the drop section. The dispersion effect of the rectified slurry is small. Most of the slurry diameter enters the straight pipe section of the second effect. Only a very small amount of slurry at the edge of the dispersed liquid column collides with the constriction section to generate water mist, which can eventually be successfully discharged into the next heat exchange unit.

[0015] 3. This application uses a serpentine tube combined with an equilateral triangular arrangement of inlet tubes, which can arrange multiple inlet tubes on the same layer, thereby allowing multiple liquid columns to exist in a limited space, significantly increasing the total evaporation area and improving the heat exchange power. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of this application.

[0017] Figure 2 This is a schematic diagram of a structure with multiple inlet tubes.

[0018] Figure 3 This is a schematic diagram of the serpentine heat exchanger pipe layout.

[0019] Figure 4 This is a schematic diagram of a heat exchange unit with a multi-channel structure. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will explain this application in detail.

[0021] This application can adopt a single-channel structure, such as Figure 1 As shown, a self-sealing indirect heat exchange device for desulfurization slurry recovery includes a heat exchange chamber 1, and at least two heat exchange units 2 arranged from top to bottom inside the heat exchange chamber 1. Each heat exchange unit 2 includes an inlet pipe 3, and a steam space 4 is provided at the bottom of the inlet pipe 3. The outlet of the inlet pipe 3 is opposite to the inlet of the inlet pipe 3 of the lower heat exchange unit 2. A cooling heat exchanger 5 is provided on the side of the inlet pipe 3, and a demister 6 is provided between the cooling heat exchanger 5 and the steam space 4.

[0022] The inlet pipe 3 includes a constricted section 7, and a drain section 8 is provided below the constricted section 7; the cross-sectional area of ​​the constricted section 7 gradually decreases from top to bottom. The constricted section 7 is truncated cone-shaped; the top diameter of the constricted section 7 is D, the bottom diameter is d, the height of the drain section 8 is H, and the angle between the generatrix of the constricted section 7 and the top surface of the constricted section 7 is α; wherein 1.2d≤D≤1.4d, 45°≤α≤75°, and H / d≥2.

[0023] The water discharge section 8 is a circular tube, and its bottom is flush with that of the constricted section 7. The central axes of the inlet pipes 3 of the upper and lower heat exchange units 2 coincide. The water discharge section 8 extends to the lower part of the corresponding demister 6; the demister 6 is a wire mesh demister.

[0024] An inlet space 9 is provided at the top of the heat exchange unit 2 of the heat exchange chamber 1, and an inlet 10 is provided at the position of the inlet space 9 corresponding to the position of the heat exchange chamber 1; an outlet space 11 is provided at the bottom of the heat exchange unit 2 of the heat exchange chamber 1, and an outlet 12 is provided at the position of the outlet space 11 corresponding to the position of the heat exchange chamber 1.

[0025] In specific operation, the desulfurization slurry is introduced into the inlet space 9 through the feed port 10, and then into the top heat exchange unit 2. From the top heat exchange unit 2, it is gradually introduced downwards into the lower heat exchange unit 2, until it reaches the bottom heat exchange unit 2, and then into the outlet space 11, and is discharged from the outlet 12. For a single heat exchange unit 2, the operation is as follows: the desulfurization slurry first enters the constriction section 7, and then enters the water drop section 8. Due to the rectification effect of the water drop section 8, a liquid column is formed and enters the steam space 4. Most of the liquid column enters the lower water drop section 8, and a small part enters the side of the constriction section 7. The water in the liquid column 20 forms water mist or steam and enters the steam space 4. Then it enters the heat exchanger through the demister 6. The demister 6 itself can also remove internal impurities, thereby reducing or even avoiding corrosion of the heat exchanger. After heat exchange in the heat exchanger, the heat inside the desulfurization slurry is recovered.

[0026] A multi-channel structure can also be adopted, such as Figures 1-4 As shown, a self-sealing indirect heat exchange device for desulfurization slurry recovery is characterized by: a heat exchange chamber 1, in which at least two heat exchange units 2 are arranged from top to bottom, each heat exchange unit 2 including an inlet pipe 3, a steam space 4 being provided at the bottom of the inlet pipe 3, the outlet of the inlet pipe 3 being opposite to the inlet of the inlet pipe 3 of the lower heat exchange unit 2; a cooling heat exchanger 5 being provided on the side of the inlet pipe 3, and a demister 6 being provided between the cooling heat exchanger 5 and the steam space 4.

[0027] The inlet pipe 3 includes a constricted section 7, below which a drain section 8 is provided; the cross-sectional area of ​​the constricted section 7 gradually decreases from top to bottom. The constricted section 7 is frustoconical; the top diameter of the constricted section 7 is D, the bottom diameter is d, the height of the drain section 8 is H, and the angle between the generatrix of the constricted section 7 and the top surface of the constricted section 7 is α; where 1.2d≤D≤1.4d, 45°≤α≤75°, and H / d≥2. The drain section 8 is a circular pipe, and the drain section 8 is flush with the bottom of the constricted section 7. The middle axes of the inlet pipes 3 of the upper and lower heat exchange units 2 coincide. The drain section 8 extends to the lower part of the corresponding demister 6; the demister 6 is a wire mesh demister.

[0028] A guide plate 13 is provided at the top of the constricted section 7, and the side of the guide plate 13 is sealed and fixed to the inner wall of the heat exchange chamber 1. Several inlet pipes 3 are provided on one guide plate 13, spaced apart. A serpentine heat exchange tube 14 is arranged in the space between the inlet pipes 3 to form a cooling heat exchanger 5. An inlet header 15 connected to a refrigerant inlet pipe 18 is provided on one side of the serpentine heat exchange tube 14, and an outlet header 17 connected to a refrigerant outlet pipe 16 is provided on the other side. The inlet pipes 3 are arranged in an equilateral triangle pattern; the bottom diameter d is 20-200 mm; and the distance between adjacent inlet pipes 3 is not less than 2d. The diameter of the serpentine heat exchange tube 14 is 20-65 mm, and the distance between the pipes within the serpentine heat exchange tube 14 is 1.2-2 times the pipe diameter.

[0029] An inlet space 9 is provided at the top of the heat exchange unit 2 of the heat exchange chamber 1, and an inlet 10 is provided at the position of the inlet space 9 corresponding to the position of the heat exchange chamber 1; an outlet space 11 is provided at the bottom of the heat exchange unit 2 of the heat exchange chamber 1, and an outlet 12 is provided at the position of the outlet space 11 corresponding to the position of the heat exchange chamber 1.

[0030] In specific operation, the desulfurization slurry is introduced into the inlet space 9 through the feed inlet 10, and then into the top heat exchange unit 2. From the top heat exchange unit 2, it is gradually introduced downwards into the lower heat exchange units 2, until it reaches the bottom heat exchange unit 2, and then enters the outlet space 11 and is discharged from the outlet 12. For a single heat exchange unit 2, the operation is as follows: the desulfurization slurry first enters the constriction section 7 under the action of the guide plate 13, and then enters the water drop section 8. Due to the rectification effect of the water drop section 8, a liquid column is formed and enters the steam space 4. Most of the liquid column enters the lower part. Within the drop section 8, a small portion enters the side of the constriction section 7. The water in the liquid column 20 forms water mist or steam and enters the steam space 4. Then, it passes through the demister 6 and enters the heat exchanger. The demister 6 itself can also remove internal impurities, thereby reducing or even avoiding corrosion of the heat exchanger. After heat exchange in the heat exchanger, the heat recovery of the desulfurization slurry is completed. As for the heat exchanger itself, it is set in the form of a serpentine heat exchange tube. The refrigerant enters the inlet header 15 through the refrigerant inlet pipe 18, then enters the serpentine heat exchange tube, and then enters the outlet header 17, and is discharged through the refrigerant outlet pipe 16.

[0031] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A self-sealing indirect heat exchange device for desulfurization slurry recovery, characterized in that: It includes a heat exchange chamber, in which at least two heat exchange units are arranged from top to bottom. Each heat exchange unit includes an inlet pipe, and a steam space is provided at the bottom of the inlet pipe. The outlet of the inlet pipe is arranged opposite to the inlet of the inlet pipe of the heat exchange unit below. A cooling heat exchanger is provided on the side of the inlet pipe, and a demister is provided between the cooling heat exchanger and the steam space.

2. The self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 1, characterized in that: The inlet pipe includes a constricted section, and a drain section is provided below the constricted section; the cross-sectional area of ​​the constricted section is arranged to gradually decrease from top to bottom.

3. The self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 2, characterized in that: The constricted section is truncated cone-shaped; the top diameter of the constricted section is D, the bottom diameter is d, the height of the water-falling section is H, and the angle between the generatrix of the constricted section and the top surface of the constricted section is α; where 1.2d≤D≤1.4d, 45°≤α≤75°, and H / d≥2.

4. The self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 3, characterized in that: The drain section is a circular pipe, and the bottom of the drain section is flush with the bottom of the constricted section.

5. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 2, characterized in that: The middle axes of the inlet pipes of the upper and lower heat exchange units are aligned.

6. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 2, characterized in that: The water drop section extends to the lower part of the corresponding demister; The demister is a wire mesh demister.

7. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 3, characterized in that: A guide plate is provided at the top of the constricted section, and the side of the guide plate is sealed and fixed to the inner wall of the heat exchange cavity; a number of inlet pipes are provided on a guide plate, and the inlet pipes are spaced apart. A serpentine heat exchange tube is provided in the space between the inlet pipes to form a cooling heat exchanger. An inlet header connected to the refrigerant inlet pipe is provided on one side of the serpentine heat exchange tube, and an outlet header connected to the refrigerant outlet pipe is provided on the other side.

8. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 7, characterized in that: The inlet tubes are arranged in an equilateral triangle pattern; the bottom diameter d is 20-200mm; and the distance between adjacent inlet tubes is not less than 2d.

9. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 7, characterized in that: The diameter of the serpentine heat exchange tube is 20-65mm, and the distance between the pipes inside the serpentine heat exchange tube is 1.2-2 times the pipe diameter.

10. A self-sealing indirect heat exchange device for desulfurization slurry recovery as described in claim 1, characterized in that: An inlet space is provided at the top of the heat exchange unit of the heat exchange chamber, and an inlet is provided at the position of the heat exchange chamber corresponding to the position of the heat exchange chamber; an outlet space is provided at the bottom of the heat exchange unit of the heat exchange chamber, and an outlet is provided at the position of the heat exchange chamber corresponding to the position of the heat exchange chamber.

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