Steam-stage drying heat exchanger
The drying heat exchange device, which utilizes steam staged utilization and waste heat recovery, solves the problems of low thermal energy utilization and waste heat in traditional equipment, realizes a highly efficient and energy-saving drying process, and improves heat exchange efficiency and thermal energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI LINGANG CHEM
- Filing Date
- 2025-07-14
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional drying equipment has low thermal energy utilization rate, insufficient heat exchange efficiency, and unutilized waste heat. Its simple structure makes it difficult to achieve efficient heat transfer.
The drying heat exchange device adopts a steam stage utilization system, which includes a primary steam utilization unit, a primary gas-liquid separator, a secondary steam utilization unit, a steam-hot water utilization unit, and a secondary gas-liquid separator. Through multi-stage steam utilization and mechanical steam recompression technology, it realizes the multiple utilization of steam and waste heat recovery.
It improves the utilization rate of steam thermal energy, increases heat exchange efficiency, solves the problems of low thermal energy utilization and waste heat in traditional heat exchange equipment, achieves high efficiency and energy saving in the drying process, and reduces production costs and resource waste.
Smart Images
Figure CN224284589U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a drying heat exchange device for steam staged utilization. Background Technology
[0002] In the production of triazine herbicides, the drying process is one of the most energy-intensive steps. Traditional drying equipment typically uses hot air as a heat source, with the heat derived from fresh steam, and the heat exchange pipes often employ finned tubes or smooth tubes. However, traditional drying equipment suffers from the following technical drawbacks:
[0003] (1) Low thermal energy utilization: Traditional drying equipment relies on primary steam, which results in serious steam waste and low thermal energy utilization.
[0004] (2) Insufficient heat exchange efficiency: Traditional heat exchange efficiency is limited and cannot meet the needs of high-efficiency drying.
[0005] (3) Waste heat is not fully utilized: Traditional drying equipment lacks an effective waste heat recovery mechanism, resulting in energy waste.
[0006] (4) Simple equipment structure: Traditional equipment is mostly single-layer structure with limited heat exchange area, making it difficult to achieve efficient heat transfer. Utility Model Content
[0007] This utility model provides a drying heat exchange device for staged steam utilization, which aims to solve the problems of low thermal energy utilization, energy waste, and difficulty in meeting the requirements of efficient drying and efficient heat transfer in existing drying equipment.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a steam-staged drying heat exchange device, comprising:
[0009] A primary steam utilization unit is used to utilize primary steam and discharge a primary gas-liquid mixture.
[0010] A primary gas-liquid separator is connected to the exhaust port of the primary steam utilization unit via a pipeline, and is used to separate the primary gas-liquid mixture into secondary steam and primary hot water.
[0011] The secondary steam utilization unit is connected to the exhaust port of the primary gas-liquid separator through a pipeline for the utilization of secondary steam and the discharge of secondary gas-liquid mixture.
[0012] The steam hot water utilization unit is connected to the drain outlet of the primary gas-liquid separator via a pipeline for the utilization of primary hot water;
[0013] A secondary gas-liquid separator, connected via pipeline to the exhaust port of the secondary steam utilization unit, is used to separate the secondary gas-liquid mixture into waste steam heat and secondary hot water; and
[0014] A steam condensate tank is connected to the drain outlet of the steam hot water utilization unit and the drain outlet of the secondary gas-liquid separator via a pipeline to recover the primary hot water and the secondary hot water;
[0015] The waste heat from the steam separated by the secondary gas-liquid separator is mixed with fresh steam to form a primary steam cycle.
[0016] One possible approach also includes:
[0017] A steam compression unit includes a static steam mixer and a steam compressor; the waste heat of the steam enters the static steam mixer along with fresh steam via a pipeline, mixes them, and is compressed by the steam compressor to form superheated steam; and
[0018] The superheated steam cooling and pressure reducing unit includes a gas-liquid static mixer and an atomizing water pressure stabilizing pump connected to the steam condensate tank. The atomizing water pressure stabilizing pump pressurizes and atomizes hot water drawn from the steam condensate tank and sprays it into the gas-liquid static mixer, where it mixes with the superheated steam to obtain the primary steam.
[0019] In one possible implementation, an atomizing nozzle is provided on the pipeline from the steam condensate tank to the gas-liquid static mixer.
[0020] In one feasible embodiment, the primary steam utilization unit, the secondary steam utilization unit, and the steam-hot water utilization unit are arranged in a line, with the heating temperatures of the primary steam utilization unit, the secondary steam utilization unit, and the steam-hot water utilization unit decreasing sequentially. The steam-hot water utilization unit is provided with a cold air inlet at one end, and the primary steam utilization unit is provided with a hot air outlet.
[0021] In one possible implementation, the primary steam utilization unit includes a primary steam heat exchanger, which includes a shell and a corrugated tube disposed within the shell, wherein the primary steam introduced into the corrugated tube exchanges heat with cold air within the shell.
[0022] In one possible implementation, a plurality of the wavelet tubes are connected in series within the housing.
[0023] In one feasible manner, a plurality of heat dissipation fins are provided on the outer surface of the corrugated tube along its length.
[0024] In one possible implementation, the heat dissipation fins are fixed in a ring shape on the corrugated tube.
[0025] In one feasible embodiment, both the primary gas-liquid separator and the secondary gas-liquid separator are flange-type gas-liquid separation orifice plates.
[0026] In one possible implementation, the steam condensate tank is further provided with a water supply pipe, and the water supply pipe is provided with a demineralized water supply regulating valve.
[0027] The steam-stage utilization drying heat exchange device provided by this utility model has the following advantages compared with the prior art:
[0028] (1) Primary utilization of fresh steam: The primary steam utilization unit utilizes the primary steam and exchanges heat with the air passing through the primary steam utilization unit to increase the air temperature and realize the primary utilization of fresh steam.
[0029] (2) Secondary utilization of fresh steam, that is, reuse of secondary steam: After primary utilization, a primary gas-liquid mixture of hot water and steam is formed. The primary hot water formed after passing through the primary gas-liquid separator has a certain temperature. However, since the temperature of the steam cooling heat exchange is higher than that of the hot water, in order to achieve the maximum utilization rate of thermal energy, this application uses a primary gas-liquid separator to separate the primary hot water and steam in the primary gas-liquid mixture. The resulting secondary steam enters the secondary steam utilization unit for continued utilization and exchanges heat with the passing air to increase the temperature of the air.
[0030] (3) The three uses of fresh steam, that is, the reuse of hot water: the hot water still has a certain temperature. When it enters the steam hot water utilization unit, the heat of the hot water is used to raise the temperature of the incoming air, thus realizing the three uses of fresh steam.
[0031] (4) Hot water recycling: After the secondary steam heat exchange, the heat released forms a secondary gas-liquid mixture of steam and hot water. After passing through the secondary gas-liquid separator, the hot water and steam are separated to form secondary hot water and steam waste heat. After the primary hot water passes through the steam hot water utilization unit and continues to cool down, it is recycled together with the secondary hot water into the steam condensate tank for recycling.
[0032] (5) The waste heat of the steam separated by the secondary gas-liquid separator is recycled to fresh steam for reuse.
[0033] This application improves the utilization rate of steam thermal energy and heat exchange efficiency by utilizing steam in stages, utilizing hot water, and recovering waste heat. It solves the problems of low thermal energy utilization, insufficient heat exchange efficiency, and waste heat in traditional heat exchange equipment, and achieves high efficiency and energy saving in the drying process.
[0034] This application increases the heat exchange area by using graded heat exchange units, which is conducive to achieving efficient heat transfer.
[0035] The device provided in this application is used for drying triazine herbicides, which solves the problems of low heat utilization rate, insufficient heat exchange efficiency and waste of waste heat in traditional heat exchange equipment, and achieves high efficiency and energy saving in the drying process, reducing production costs and waste of resources. Attached Figure Description
[0036] Figure 1 A schematic diagram of the structure of the steam-stage utilization drying heat exchange device provided in an embodiment of this utility model (arrows indicate the direction of steam).
[0037] Figure 2 A schematic diagram of the structure of a primary steam utilization unit provided in an embodiment of this utility model (showing the internal corrugated tube);
[0038] Figure 3 A schematic diagram of the main structure of a primary gas-liquid separator provided in an embodiment of this utility model;
[0039] Explanation of reference numerals in the attached figures:
[0040] 1. Primary steam utilization unit; 2. Primary heat exchange steam outlet valve; 3. Primary gas-liquid separator; 4. Secondary steam heat exchange inlet regulating valve; 5. Tertiary steam hot water inlet regulating valve; 6. Secondary steam utilization unit; 7. Steam hot water utilization unit; 8. Cold air inlet; 9. Tertiary steam hot water outlet valve; 10. Secondary heat exchange steam outlet valve; 11. Primary steam heat exchange inlet regulating valve; 12. Secondary gas-liquid separator; 13. Demineralized water makeup water regulating valve; 14. Steam condensate tank; 15. Condensate outlet regulating valve; 16. Atomized water pressure stabilizing pump; 17. Atomized water makeup water flow meter; 18. Atomized water makeup water regulating valve; 19. Gas-liquid static mixer; 20. Steam compressor; 21. Steam static mixer; 22. Fresh steam makeup gas regulating valve; 23. Steam residual gas regulating valve; 24. Hot air outlet; 25. Corrugated tube; 26. Heat dissipation fins. Detailed Implementation
[0041] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0042] Please see Figures 1 to 3 The present invention provides a steam-stage utilization drying heat exchange device. The steam-stage utilization drying heat exchange device includes: a primary steam utilization unit 1, a primary gas-liquid separator 3, a secondary steam utilization unit 6, a steam-hot water utilization unit 7, a secondary gas-liquid separator 12, and a steam condensate tank 14.
[0043] The primary steam utilization unit 1 is used to utilize fresh steam and primary steam generated after multiple stages of utilization of this device, and discharges primary gas-liquid mixture.
[0044] The primary gas-liquid separator 3 is connected to the exhaust port of the primary steam utilization unit 1 via a pipeline, and is used to separate the primary gas-liquid mixture into secondary steam and primary hot water.
[0045] The secondary steam utilization unit 6 is connected to the exhaust port of the primary gas-liquid separator through a pipeline for the utilization of secondary steam and the discharge of secondary gas-liquid mixture.
[0046] The steam hot water utilization unit 7 is connected to the drain outlet of the primary gas-liquid separator via a pipeline for the utilization of primary hot water.
[0047] The secondary gas-liquid separator 12 is connected to the exhaust port of the secondary steam utilization unit 6 through a pipeline, and is used to separate the secondary gas-liquid mixture into steam waste heat and secondary hot water.
[0048] The steam condensate tank 14 is connected to the drain outlet of the steam hot water utilization unit 7 and the drain outlet of the secondary gas-liquid separator 12 through a pipeline to recover primary hot water and secondary hot water; the waste heat of steam separated by the secondary gas-liquid separator 12 is mixed with fresh steam to form a primary steam cycle.
[0049] The steam-stage utilization drying heat exchange device provided by this utility model has the following advantages compared with the prior art:
[0050] (1) Primary utilization of fresh steam: The primary steam utilization unit 1 utilizes the primary steam and exchanges heat with the air passing through the primary steam utilization unit 1 to increase the temperature of the air and realize the primary utilization of fresh steam.
[0051] (2) Secondary utilization of fresh steam, that is, reuse of secondary steam: After primary utilization, a primary gas-liquid mixture of hot water and steam is formed. The primary hot water formed after passing through the primary gas-liquid separator has a certain temperature. However, since the temperature of the steam cooling heat exchange is higher than that of the hot water, in order to achieve the maximum utilization rate of thermal energy, this application uses a primary gas-liquid separator to separate the primary hot water and steam in the primary gas-liquid mixture. The resulting secondary steam enters the secondary steam utilization unit 6 for continued utilization and exchanges heat with the passing air to increase the temperature of the air.
[0052] (3) The three-time use of fresh steam, that is, the reuse of hot water: the hot water still has a certain temperature. It enters the steam hot water utilization unit 7 and uses the heat of the hot water to raise the temperature of the incoming air, thus realizing the three-time use of fresh steam.
[0053] (4) Hot water recycling: After the secondary steam heat exchange, the heat released forms a secondary gas-liquid mixture of steam and hot water. After passing through the secondary gas-liquid separator, the hot water and steam are separated to form secondary hot water and steam waste heat. After the primary hot water passes through the steam hot water utilization unit 7, it continues to cool down and is recycled together with the secondary hot water into the steam condensate tank 14 for recycling.
[0054] (5) The waste heat of the steam separated by the secondary gas-liquid separator is recycled to fresh steam for reuse.
[0055] This application improves the utilization rate of steam thermal energy and heat exchange efficiency by utilizing steam in stages, utilizing hot water, and recovering waste heat. It solves the problems of low thermal energy utilization, insufficient heat exchange efficiency, and waste heat in traditional heat exchange equipment, and achieves high efficiency and energy saving in the drying process.
[0056] This application increases the heat exchange area by using graded heat exchange units, which is conducive to achieving efficient heat transfer.
[0057] The device provided in this application is used for drying triazine herbicides, which solves the problems of low heat utilization rate, insufficient heat exchange efficiency and waste of waste heat in traditional heat exchange equipment, and achieves high efficiency and energy saving in the drying process, reducing production costs and waste of resources.
[0058] Since the hot water and steam waste heat of this application can be fully reused, the steam staged utilization and waste heat recovery technology provided by this application does not require additional steam except for the initial start-up, which significantly reduces energy consumption.
[0059] See Figure 1 As shown, the device provided in this application further includes: a steam compression unit and a superheated steam cooling and pressure reducing unit. The steam compression unit includes a steam static mixer 21 and a steam compressor 20. Waste steam enters the steam static mixer 21 along with fresh steam through a pipeline for thorough mixing, and is then compressed and pressurized by the steam compressor 20 to obtain superheated steam. The superheated steam cooling and pressure reducing unit includes a gas-liquid static mixer 19 and an atomizing water pressure stabilizing pump 16 connected to a steam condensate tank 14. The superheated steam and hot water from the steam condensate tank 14 are pressurized by the atomizing water pressure stabilizing pump 16, and the atomized water formed by atomization through an atomizing nozzle is thoroughly mixed in the water-gas-liquid static mixer 19 to obtain primary steam.
[0060] Among them, an atomized water replenishment regulating valve 18 and an atomized water replenishment flow meter 17 are installed on the pipeline between the gas-liquid separator and the atomized water pressure stabilizing pump 16 to adjust the replenishment flow rate as needed.
[0061] This application maximizes thermal energy utilization and reduces steam waste through multi-stage steam utilization and mechanical steam recompression technology.
[0062] In some embodiments, an atomizing nozzle (not shown in the figure) is provided on the pipeline from the steam condensate tank 14 to the gas-liquid static mixer 19. Optionally, the angle between the nozzle orifice on the atomizing nozzle and the horizontal direction is 60~120°, and the atomizing nozzle is any one of a hollow conical nozzle, a solid conical nozzle, a fan-shaped nozzle, a spiral solid conical nozzle, etc.
[0063] In some embodiments, see Figure 1 As shown, the primary steam utilization unit 1, the secondary steam utilization unit 6, and the steam-hot water utilization unit 7 are arranged in a line. The heating temperatures of the primary steam utilization unit 1, the secondary steam utilization unit 6, and the steam-hot water utilization unit 7 decrease sequentially. The steam-hot water utilization unit 7 is equipped with a cold air inlet 8 at one end, and the primary steam utilization unit 1 is equipped with a hot air outlet 24. The cold air passes through the steam-hot water utilization unit 7, the secondary steam utilization unit 6, and the primary steam utilization unit 1 in sequence, forming a gradient temperature rise from preheating to gradual temperature increase. This not only improves the utilization rate of thermal energy but also enhances the heating effect.
[0064] This application uses a series of sequentially arranged steam utilization units to form a multi-layer structure design, which increases the heat exchange area and further improves the overall heat exchange performance of the equipment.
[0065] In some embodiments, see Figure 2 As shown, the primary steam utilization unit 1 includes a primary steam heat exchanger, which includes a shell and a corrugated tube 25 disposed within the shell. Primary steam introduced into the corrugated tube 25 exchanges heat with the cold air inside the shell. The corrugated tube 25 has the characteristics of thin tube wall, small temperature gradient and low thermal resistance, which can significantly improve the heat transfer coefficient between the inside and outside of the tube.
[0066] See Figure 2 As shown, the secondary steam utilization unit 6 has the same structure as the primary steam utilization unit 1, including a secondary steam heat exchanger. The secondary steam heat exchanger includes a shell and a corrugated tube 25 disposed in the shell. The secondary steam introduced into the corrugated tube 25 exchanges heat with the cold air in the shell.
[0067] The steam hot water utilization unit 7 has the same structure as the primary steam utilization unit 1, including a three-stage steam heat exchanger.
[0068] The primary, secondary, and tertiary steam heat exchangers are all made of stainless steel materials such as 304, 316L, and 2205.
[0069] In some embodiments, see Figure 2As shown, multiple corrugated tubes 25 are connected in series inside the shell. This design increases the heat exchange time between steam and air, thereby further improving the heat exchange effect and energy utilization, reducing heat waste, and achieving high efficiency and energy saving in the drying process.
[0070] In some embodiments, see Figure 2 As shown, a plurality of heat dissipation fins 26 are arranged along the length of the tube on the outer surface of the corrugated tube 25. By adding heat dissipation fins 26 to the surface of the corrugated tube 25, the heat dissipation area is significantly increased, further improving the heat transfer efficiency. This use of a corrugated tube 25 with heat dissipation fins 26 can significantly improve heat exchange efficiency, reduce thermal resistance, and enhance the turbulence of the fluid.
[0071] In some embodiments, see Figure 2 As shown, the heat dissipation fins 26 are fixed in a ring shape on the corrugated tube 25.
[0072] In some embodiments, see Figure 1 and Figure 3 As shown, both the primary gas-liquid separator and the secondary gas-liquid separator 12 are flange-type gas-liquid separation orifice plates. The flange-type gas-liquid separation orifice plate is a separation orifice plate with single or multiple holes at the top and bottom. The holes on the separation orifice plate can be round, triangular, elliptical, square, or other polygonal shapes.
[0073] In some embodiments, see Figure 1 As shown, the steam condensate tank 14 is also equipped with a water supply pipe, and the water supply pipe is equipped with a demineralized water supply regulating valve 13 to supply water and remove the salt scale or scale deposited in the device. The atomizing water pressure stabilizing pump 16 is also equipped with a condensate outlet pipe, and the condensate outlet regulating valve 15 is equipped with a condensate outlet pipe to extract the condensate in the pipeline.
[0074] The pipelines connecting each unit in this application are selectively equipped with flow meters, regulating valves, thermometers, pressure gauges, etc., which are all standard settings for pipeline systems and will not be described in detail in this article.
[0075] The process of using this application for air drying heat exchange of triazine herbicides is as follows:
[0076] Combination Figure 1 As shown, air enters from the cold air inlet 8, and is heated sequentially through the steam hot water utilization unit 7, the secondary steam utilization unit 6, and the primary steam utilization unit 1 before being discharged from the hot air outlet 24, thus achieving air heating.
[0077] Low-pressure residual steam from residual steam regulating valve 23 and fresh steam from fresh steam replenishment regulating valve 22 are mixed by steam static mixer 21. The mixed steam is pressurized by steam compressor 20 to obtain superheated steam. The superheated steam and hot water from steam condensate tank 14 are pressurized by atomizing water pressure stabilizing pump 16. The atomized water formed by atomization by atomizing nozzle is fully mixed in gas-liquid static mixer 19 to obtain primary steam and form saturated steam.
[0078] Saturated steam enters the primary steam heat exchanger through the primary steam heat exchanger inlet regulating valve 11. The steam-water mixture after heat exchange with air enters the primary gas-liquid separator 3 through the primary heat exchanger steam outlet valve 2 for separation. The steam enters the secondary steam utilization unit 6, and the hot water enters the steam-hot water utilization unit 7.
[0079] Secondary steam utilization unit 6: Steam from primary steam utilization unit 1 enters the secondary steam heat exchange unit through the secondary steam heat exchange inlet regulating valve 4. After heat exchange with air, it enters the secondary gas-liquid separator 12 through the secondary heat exchange steam outlet valve 10 to separate residual steam and hot water.
[0080] Steam hot water utilization unit 7: Steam hot water from primary steam utilization unit 1 enters steam hot water utilization unit 7 through tertiary steam hot water inlet regulating valve 5. After heat exchange with air, steam hot water from tertiary steam hot water outlet valve 9 and steam hot water from secondary gas-liquid separator 12 enter steam condensate tank 14 for recycling.
[0081] The device provided by this utility model realizes multi-stage heating of air, improves heat exchange efficiency, and makes full use of the waste heat of steam, basically achieving ultra-low loss of fresh steam and greatly saving the amount of fresh steam used.
[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0083] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A drying heat exchange device for steam hierarchical utilization, characterized in that Comprising: A primary steam utilization unit (1) for utilizing primary steam and discharging a primary gas-liquid mixture; A first-stage gas-liquid separator (3) connected to the exhaust port of the primary steam utilization unit (1) through a pipeline, for separating the primary gas-liquid mixture into secondary steam and primary hot water; A secondary steam utilization unit (6) connected to the exhaust port of the first-stage gas-liquid separator (3) through a pipeline, for utilizing secondary steam and discharging a secondary gas-liquid mixture; A steam and hot water utilization unit (7) connected to the drain port of the first-stage gas-liquid separator (3) through a pipeline, for utilizing primary hot water; A second-stage gas-liquid separator (12) connected to the exhaust port of the secondary steam utilization unit (6) through a pipeline, for separating the secondary gas-liquid mixture into steam waste heat and secondary hot water; and A steam condensate tank (14) connected to the drain port of the steam and hot water utilization unit (7) and the drain port of the second-stage gas-liquid separator (12) through pipelines, to recover the primary hot water and the secondary hot water; The steam waste heat separated by the second-stage gas-liquid separator (12) is mixed with fresh steam to form a primary steam recycling.
2. The drying heat exchange device for steam hierarchical utilization according to claim 1, wherein Further comprising: A steam compression unit, including a steam static mixer (21) and a steam compressor (20); the steam waste heat enters the steam static mixer (21) through a pipeline and is mixed with fresh steam, and is compressed by the steam compressor (20) to form superheated steam; and A superheated steam cooling and decompression unit, including a gas-liquid static mixer (19) and an atomized water pressure stabilizing pump (16) connected to the steam condensate tank (14); the atomized water pressure stabilizing pump (16) pressurizes and atomizes the hot water drawn from the steam condensate tank (14) and sprays it into the gas-liquid static mixer (19), and mixes with the superheated steam in the gas-liquid static mixer (19) to obtain the primary steam.
3. The drying heat exchange device for steam hierarchical utilization according to claim 2, wherein An atomizing nozzle is provided on the pipeline where the steam condensate tank (14) leads to the gas-liquid static mixer (19).
4. The drying heat exchange device for steam hierarchical utilization according to claim 1, wherein The primary steam utilization unit (1), the secondary steam utilization unit (6), and the steam and hot water utilization unit (7) are arranged in a line, the heating temperatures of the primary steam utilization unit (1), the secondary steam utilization unit (6), and the steam and hot water utilization unit (7) decrease in sequence, a cold air inlet (8) is provided at one end of the steam and hot water utilization unit (7), and a hot air outlet (24) is provided on the primary steam utilization unit (1).
5. The drying heat exchange device for steam hierarchical utilization according to claim 1, characterized in that, The primary steam utilization unit (1) includes a primary steam heat exchanger, and the primary steam heat exchanger includes a shell and corrugated tubes (25) provided in the shell, and the primary steam introduced into the corrugated tubes (25) exchanges heat with the cold air in the shell.
6. The drying heat exchange device for steam hierarchical utilization according to claim 5, wherein A plurality of the corrugated tubes (25) are connected in series in the shell.
7. The drying heat exchange device for steam grading utilization according to claim 5, wherein A number of heat dissipation fins (26) are provided on the outer surface of the corrugated tubes (25) along the tube length direction.
8. The drying heat exchange device for steam grading utilization according to claim 7, wherein, The heat dissipation fins (26) are fixedly arranged in a ring on the corrugated tubes (25).
9. The drying heat exchange device for steam grading utilization according to claim 1, wherein Both the first-stage gas-liquid separator (3) and the second-stage gas-liquid separator (12) are flange-type gas-liquid separation orifice plates.
10. The drying heat exchange device for steam hierarchical utilization according to claim 1, wherein, A make-up water pipe is also arranged on the steam condensate tank (14), and a demineralized water make-up regulating valve (13) is arranged on the make-up water pipe.