Efficient steam waste heat recovery device and method

Abstract

The invention relates to the technical field of steam waste heat recovery, and particularly discloses an efficient steam waste heat recovery device and a method thereof.The efficient steam waste heat recovery device comprises a spray tower, the bottom of the spray tower is provided with a steam feeding pipeline and a liquid discharging pipeline, and the top of the spray tower is provided with a steam discharging pipeline and a liquid feeding pipeline; the flow guide frame is arranged in the spray tower and comprises a main shaft vertically arranged in the spray tower, a spiral flow guide blade arranged on the main shaft and hermetically connected with the inner wall of the spray tower, and a top flow guide plate and a bottom flow guide plate which are respectively arranged on the upper surface and the lower surface of the spiral flow guide blade in a staggered manner; the heat pump or the heat exchanger communicated with the steam discharging pipeline promotes the interaction effect between liquid and steam through the top flow guide plate and the bottom flow guide plate, and therefore the problems that in traditional steam waste heat recovery, when impurities in steam are cleaned through a spraying tower, the interaction effect between the steam and water flow is poor, and consequently part of the impurities escape, and waste heat is generated are solved. And the follow-up heat energy recovery effect is affected, and the steam waste heat recovery effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of steam waste heat recovery, and specifically discloses a high-efficiency steam waste heat recovery device and method thereof. Background Art

[0002] Superheated steam is a drier steam obtained by heating a liquid until it is completely evaporated into dry saturated steam and then continuing to heat it. Compared with other gases such as air, superheated steam has the advantages of large kinetic energy, high cleanliness, low viscosity, and no static electricity explosion problems. It is used in food processing, wood drying, sludge treatment, chemical production and other fields.

[0003] For example, in the processing of titanium dioxide, superheated steam is used as the pulverizing medium. Since the pressure of superheated steam is much higher than that of compressed air, the kinetic energy of steam gas is greater than that of compressed air. This high kinetic energy helps to achieve ultra-fine pulverization or depolymerization of titanium dioxide, meeting the high requirements of titanium dioxide for particle size and particle size distribution; at the same time, the cleanliness of superheated steam is higher than that of compressed air, and no new impurities will be introduced during use, which is conducive to maintaining the high purity of titanium dioxide. The steam exhaust gas emitted during the production process still contains a large amount of heat energy. Recovering the waste heat in the steam exhaust gas is of great significance for energy conservation, environmental protection, emission reduction and improving production efficiency. It can effectively reduce the energy consumption cost of enterprises, reduce the emission of environmental pollutants, and improve the energy utilization efficiency of the production process.

[0004] At present, the waste heat recovery in steam tail gas usually includes: using heat pump technology to convert low-temperature heat energy into high-temperature heat energy, so as to achieve the purpose of recovering steam waste heat; or using heat transfer equipment such as heat exchangers to directly recover heat energy. However, for superheated steam that is in direct contact with production materials or other media during the process, its tail gas inevitably contains impurities such as material dust. When recycling the waste heat of steam, the impurities in the steam will seriously affect the steam heat exchange ability and the performance and service life of the recycling equipment. At present, the more common treatment method is to filter the impurities in the steam before heat recovery or to clean the steam through a spray tower. When filtering treatment is adopted, the working environment of the filter is poor, the service life is short, and the filter cake formed on the surface of the filter is difficult to clean, and the production cost is high; when using a spray tower treatment, the steam flow rate is fast, the contact interaction effect between the steam and the water flow is poor, and some impurities escape, affecting the subsequent heat energy recovery effect. In order to improve the treatment effect, it is usually necessary to increase the water supply, which not only causes a waste of water resources, but also the increase in water volume during the cleaning process also causes the steam temperature to decrease, which reduces the steam waste heat recovery efficiency and also increases the subsequent cost of separating impurities from the water. Therefore, in view of this, the inventor provides a high-efficiency steam waste heat recovery device and method thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in traditional steam waste heat recovery, when a spray tower is used to clean impurities in steam, the interaction between steam and water flow is poor, resulting in some impurities escaping and affecting the subsequent heat energy recovery effect.

[0006] In order to achieve the above object, the basic scheme of the present invention provides a high-efficiency steam waste heat recovery device, comprising: A spray tower, wherein a steam feed pipe and a liquid discharge pipe are respectively provided at the bottom of the spray tower, and a steam discharge pipe and a liquid feed pipe are respectively provided at the top of the spray tower; A guide frame arranged in the spray tower comprises a main shaft arranged vertically in the spray tower, a spiral guide blade arranged on the main shaft and tightly connected to the inner wall of the spray tower, a top guide plate and a bottom guide plate arranged alternately on the upper surface and the lower surface of the spiral guide blade, the top guide plate is provided with a first guide surface facing the lower surface of the spiral guide blade, and the bottom guide plate is provided with a second guide surface facing the upper surface of the spiral guide blade; A heat pump or heat exchanger connected to the steam discharge pipe.

[0007] The principles and effects of this basic solution are: The present invention extends the paths of steam and liquid flowing in the spray tower by means of spiral guide vanes, thereby promoting the interaction effect between steam and liquid, and utilizing the liquid to adsorb impurities in the steam. At the same time, based on the characteristics that when steam flows on the spiral guide vanes, it mainly flows along the lower surface of the spiral guide vanes, while when liquid flows on the spiral guide vanes, it mainly flows along the upper surface of the spiral guide vanes. In order to further increase the contact area and interaction effect between the liquid and the steam, the first guide surface on the top guide plate guides the liquid flowing on the upper surface of the spiral guide vanes to the spiral guide vanes. The lower surface of the spiral guide blade is guided by the second guide surface on the bottom guide plate to the upper surface of the spiral guide blade, so that the steam and the liquid are intertwined and flow relative to each other at a nearly vertical angle between the top guide plate and the bottom guide plate, thereby improving the adsorption effect of the liquid on the impurities in the steam, thereby solving the problem that in traditional steam waste heat recovery, when a spray tower is used to clean impurities in the steam, the interaction effect between the steam and the water flow is poor, resulting in the escape of some impurities, affecting the subsequent heat recovery effect, so as to improve the recovery effect of the steam waste heat.

[0008] Furthermore, the surfaces of the first guide surface and the second guide surface are both provided with a plurality of guide strips, and gaps are formed between the guide strips to allow the flow of steam or liquid. This arrangement can guide the liquid or steam along the radial direction of the spiral guide blade, thereby preventing the liquid or steam from being unevenly distributed in the radial direction of the spiral guide blade and affecting the adsorption effect of impurities.

[0009] Furthermore, the guide strip is inclined from one side of the circumferential end of the spiral guide blade toward the middle of the spiral guide blade, and the width of the gap increases uniformly along the direction of the flow of steam or liquid. This is based on the flow characteristics that when liquid or steam flows on the spiral guide blade, the steam or liquid flow rate at the circumferential end of the spiral guide blade is higher than the steam or liquid flow rate in the middle of the spiral guide blade, and the steam or liquid at the circumferential end of the spiral guide blade is guided to the middle of the spiral guide blade, thereby improving the uniformity of the distribution of liquid or steam in the radial direction of the spiral guide blade.

[0010] Furthermore, a sandwich is provided inside the spiral guide blade, and a plurality of slots connected to the sandwich are provided on the spiral guide blade, and the slots are located at the front side of the top guide plate along the liquid flow direction. When the liquid contacts the steam, the mass of the liquid adsorbing impurities forms particles mixed with liquid and impurities, and the mass increases. After flowing out from the end of the top guide plate, the falling path is closer, so that it falls into the slot and enters the sandwich, so as to achieve the effect of timely separation of the liquid adsorbing impurities, avoid the liquid from continuously contacting with the steam, and the flow of the steam will bring out the impurities again, while also maintaining the cleanliness of the subsequent flowing liquid, so as to improve the adsorption effect of the subsequent flowing liquid on the impurities in the steam.

[0011] Furthermore, it also includes a separation cylinder arranged at the bottom of the spray tower, wherein a filter plate is arranged inside the separation cylinder, and a partition is arranged inside the separation cylinder, and the partition separates the separation cylinder into a liquid chamber and an impurity chamber, wherein the liquid discharge pipe is connected to the liquid chamber, and the impurity chamber is connected to an impurity box. With this arrangement, the liquid adsorbed with impurities can be initially separated in the spray tower, so as to reduce the subsequent solid-liquid separation process and cost.

[0012] Furthermore, a rotating drum is rotatably connected in the separation drum, and a plurality of scrapers are provided on the rotating drum for scraping along the surface of the filter plate. The rotating drum drives the scrapers to rotate, so that the scrapers scrape along the surface of the filter plate, thereby preventing impurities from accumulating on the surface of the filter plate for a long time and causing the filter plate to be blocked.

[0013] Furthermore, the scrapers are respectively arranged on the upper surface and the lower surface of the filter plate, and a through groove for allowing the scrapers to pass through is formed between the filter plate and the partition plate, thereby further improving the cleaning effect of the scrapers on the surface of the filter plate.

[0014] Furthermore, a driving box is provided between the steam discharge pipe and the spray tower, a rotating shaft is rotatably connected in the driving box, a fan blade is provided on the top of the rotating shaft located in the driving box, and the rotating shaft passes through the main shaft and is connected to the rotating drum. The fan blade and the rotating shaft are driven to rotate by the potential energy of the steam flow, thereby driving the rotating drum and the scraper to rotate, so that the scraper scrapes along the surface of the filter plate, thereby cleaning the impurities on the surface of the filter plate.

[0015] Based on the same inventive concept, the present invention discloses a high-efficiency steam waste heat recovery method, comprising the following steps: Step S1, collecting steam tail gas processed by superheated steam; Step S2, passing the collected steam tail gas into the above-mentioned spray tower for impurity removal; Step S3, the steam after impurity removal enters the heat pump or heat exchanger through the steam discharge pipe at the top of the spray tower; Step S4, converting the steam after impurities removal into high-temperature steam through a heat pump, or recovering heat energy in the steam after impurities removal through a heat exchanger.

[0016] Furthermore, in step S2, steam and liquid flow relative to each other, and the steam flows along the lower surface of the spiral guide blade and is guided by the bottom guide plate to the upper surface of the spiral guide blade, and the liquid flows along the upper surface of the spiral guide blade and is guided by the top guide plate to the lower surface of the spiral guide blade.

[0017] This method promotes the interaction between liquid and steam through the top guide plate and the bottom guide plate, thereby solving the problem in traditional steam waste heat recovery that when a spray tower is used to clean impurities in steam, the interaction between steam and water flow is poor, causing some impurities to escape, affecting the subsequent heat recovery effect, so as to improve the recovery effect of steam waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the internal structure of a spray tower in a high-efficiency steam waste heat recovery device proposed in an embodiment of the present application is shown; Figure 2 A front view of the internal structure of a spray tower in a high-efficiency steam waste heat recovery device proposed in an embodiment of the present application is shown; Figure 3 Shows Figure 2 The enlarged schematic diagram of part A in the middle; Figure 4 A schematic diagram of the structure of a top guide plate in a high-efficiency steam waste heat recovery device proposed in an embodiment of the present application is shown; Figure 5 A schematic diagram of the structure of a separation cylinder in a high-efficiency steam waste heat recovery device proposed in an embodiment of the present application is shown; Figure 6A partial structural cross-sectional view of a separation cylinder in a high-efficiency steam waste heat recovery device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0021] The figure marks in the drawings of the specification include: base 1, spray tower 2, spiral guide blade 3, lower blade 301, upper blade 302, connecting plate 303, main shaft 4, drive box 5, steam feed pipe 6, steam discharge pipe 7, liquid feed pipe 8, liquid discharge pipe 9, separation cylinder 10, filter plate 11, scraper 12, top guide plate 13, bottom guide plate 14, notch 15, impurity box 16, interlayer 17, steam feed port 18, liquid feed port 19, rotating shaft 20, guide strip 21, impurity chamber 22, partition 23, through groove 24, limit ring 25, rotating cylinder 26.

[0022] A high-efficiency steam waste heat recovery device comprises a spray tower 2 for cleaning impurities such as material powder in steam and a heat pump or heat exchanger for recovering heat energy of the cleaned steam.

[0023] like Figure 1 and Figure 2 As shown: the bottom of the spray tower 2 is supported and fixed by a base 1 and a plurality of supporting legs, the bottom side wall of the spray tower 2 is connected to a steam feed pipe 6, the top side wall of the spray tower 2 is connected to a liquid feed pipe 8, the steam feed pipe 6 and the liquid feed pipe 8 are connected to the inside of the spray tower 2 through a steam feed port 18 and a liquid feed port 19 respectively, the top center of the spray tower 2 is connected to a steam discharge pipe 7 through a drive box 5, a separation cylinder 10 is provided at the bottom of the spray tower 2, and the bottom of the separation cylinder 10 is respectively connected to a liquid discharge pipe 9 and an impurity box 16.

[0024] like Figure 1 and Figure 2 As shown: a guide frame is provided in the spray tower 2, and the guide frame includes a main shaft 4 arranged in the spray tower 2, a spiral guide blade 3 arranged on the main shaft 4 and tightly connected to the inner wall of the spray tower 2, and a top guide plate 13 and a bottom guide plate 14 respectively arranged on the upper surface and the lower surface of the spiral guide blade 3. The top guide plate 13 is provided with a first guide surface facing the lower surface of the spiral guide blade 3, and the bottom guide plate 14 is provided with a second guide surface facing the upper surface of the spiral guide blade 3. The steam feed port 18 and the liquid feed port 19 are connected to the interior of the spray tower 2 at an angle tangent to the spiral guide blade 3, and the spiral guide blade 3 extends to below the steam feed port 18.

[0025] When the steam flows on the spiral guide blade 3, it mainly flows along the lower surface of the spiral guide blade 3, and when the liquid flows on the spiral guide blade 3, it mainly flows along the upper surface of the spiral guide blade 3. The first guide surface on the top guide plate 13 guides the liquid flowing on the upper surface of the spiral guide blade 3 to the lower surface of the spiral guide blade 3, and at the same time, the second guide surface on the bottom guide plate 14 guides the steam flowing on the lower surface of the spiral guide blade 3 to the upper surface of the spiral guide blade 3, so that the steam and the liquid are intertwined with each other, and flow relative to each other at a nearly vertical angle between the top guide plate 13 and the bottom guide plate 14, thereby improving the adsorption effect of the liquid on impurities in the steam.

[0026] like Figure 2 and Figure 3 As shown, the spiral guide blade 3 includes a lower blade 301, an upper blade 302 and a connecting piece 303 arranged between the lower blade 301 and the upper blade 302. The upper blade 302 is the upper surface of the spiral guide blade 3, the lower blade 301 is the lower surface of the spiral guide blade 3, and there is a gap between the lower blade 301 and the upper blade 302, so that an interlayer 17 is formed in the spiral guide blade 3, and the interlayer 17 and the upper surface of the spiral guide blade 3 are both located above the separation barrel 10, and the spiral guide blade 3 is tightly connected and fixed to the inner wall of the spray tower 2 through the connecting piece 303.

[0027] When liquid or steam flows along the spiral guide blade 3, the steam or liquid flow rate at the peripheral end of the spiral guide blade 3 is higher than the steam or liquid in the middle of the spiral guide blade 3, making the liquid or steam uneven in the radial direction of the spiral guide blade 3. To avoid this problem, Figure 4 As shown, a plurality of guide strips 21 are provided on the surfaces of the first guide surface and the second guide surface, and gaps for accommodating the flow of steam or liquid are formed between the guide strips 21, and the guide strips 21 are inclined from one side of the peripheral end of the spiral guide blade 3 toward the middle of the spiral guide blade 3, so that the width of the gap increases uniformly along the direction of the steam or liquid flow, that is, one end of the guide strips 21 is arranged in a relatively dense manner and toward the peripheral end of the spiral guide blade 3, while the other end of the guide strips 21 is arranged in a relatively loose manner and inclined toward the middle of the spiral guide blade 3.

[0028] After the liquid contacts the steam, the mass of the liquid adsorbing the impurities forms particles mixed with the liquid and the impurities. Compared with the pure liquid, the mass of the liquid mixed with the impurities increases. After flowing out from the end of the top guide plate 13, the falling path is closer, such as Figure 4As shown, the spiral guide blade 3 is provided with a plurality of slots 15 which are interconnected with the internal interlayer 17, and each slot 15 is respectively located at the front side of the top guide plate 13 along the liquid flow direction, so that the liquid adsorbed with impurities falls into the slot 15 and enters the interlayer 17, so as to achieve the effect of timely separation of the liquid adsorbed with impurities, avoid the liquid from continuously contacting with the steam, and the flow of the steam brings out the impurities again, while also maintaining the cleanliness of the subsequent flowing liquid, so as to improve the adsorption effect of the subsequent flowing liquid on the impurities in the steam.

[0029] like Figure 5 and Figure 6 As shown, a filter plate 11 is provided in the separation cylinder 10, and a fan-shaped notch is provided on the filter plate 11. The notch is located below the spiral guide blade 3, so that when the liquid rushes out from the spiral guide blade 3 or the interlayer 17, it directly impacts the surface of the filter plate 11 to prevent the liquid from entering the notch. The separation cylinder 10 is vertically provided with two partitions 23, which are respectively located on both sides of the notch. The bottom of the partition 23 is connected to the inner bottom surface of the filter cylinder, and a through groove 24 is formed between the top of the partition 23 and the filter plate 11. The partition 23 divides the separation cylinder 10 into a liquid chamber and an impurity chamber 22. The top of the liquid chamber is the filter plate 11, and the top of the impurity chamber 22 is a notch. The liquid chamber is connected to the liquid discharge pipe 9, and the impurity chamber 22 is connected to the impurity box 16. In the process of cleaning impurities in steam, the liquid level in the liquid chamber is higher than the connection point between the liquid chamber and the liquid discharge pipe 9, and the impurity box 16 remains sealed. After the steam impurity cleaning is completed, the impurity box 16 is cleaned regularly.

[0030] like Figure 5 and Figure 6 As shown, the main shaft 4 in the present application is a hollow shaft, and a rotating shaft is rotatably connected inside the main shaft 4. The top of the rotating shaft is located in the driving box 5 and is provided with a fan blade that is driven and rotated by steam. The bottom of the rotating shaft is rotatably connected to the bottom surface of the separation cylinder 10. A step surface larger than the hollow diameter inside the main shaft 4 is provided at the connection between the rotating shaft and the bottom of the main shaft 4. A rotating cylinder 26 located in the separation cylinder 10 is provided on the side wall of the rotating shaft. A through hole adapted to the outer wall of the rotating cylinder 26 is provided at the center of the filter plate 11 to allow the rotating cylinder 26 to rotate. One or more scrapers 12 are provided on the side wall of the rotating cylinder 26, which are respectively located on the upper and lower surfaces of the filter plate 11. The scraper 12 located on the lower surface of the filter plate 11 passes through the through groove 24 between the top of the partition 23 and the filter plate 11 when rotating. Limiting rings 25 are provided on the upper and lower inner walls of the separation cylinder 10, respectively, and the ends of the scraper 12 are rotatably connected between the limiting ring 25 and the filter plate 11.

[0031] The potential energy of the steam flow drives the fan blades and the shaft to rotate, thereby driving the drum 26 and the scraper 12 to rotate, so that the scraper 12 scrapes along the surface of the filter plate 11, thereby cleaning the impurities on the surface of the filter plate 11 to prevent the impurities from accumulating on the surface of the filter plate 11 for a long time and causing the filter plate 11 to be blocked.

[0032] In this embodiment, the collected steam tail gas is introduced from the steam feed pipe 6 into the above-mentioned spray tower 2 for impurity removal, and at the same time, a clean liquid is introduced from the liquid discharge pipe 9 into the spray tower 2 through a liquid pump, and the steam and the liquid flow relative to each other. The steam flows along the lower surface of the spiral guide blade 3 and is guided to the upper surface of the spiral guide blade 3 by the second guide surface on the bottom guide plate 14. The liquid flows along the upper surface of the spiral guide blade 3 and is guided to the lower surface of the spiral guide blade 3 by the top guide plate 13. At the same time, the guide strip 21 allows the liquid or steam to flow in the radial direction of the spiral guide blade 3. The distribution is more uniform, the steam and the liquid are interlaced, and flow relative to each other at a nearly vertical angle between the top guide plate 13 and the bottom guide plate 14, thereby improving the adsorption effect of the liquid on the impurities in the steam, and the liquid adsorbing the impurities falls into the groove 15 and enters the interlayer 17 after passing through the top guide plate 13, so that the liquid adsorbing the impurities is separated from the clean liquid in time to avoid continuous contact with the steam. The flow of steam brings out the impurities again, while also maintaining the cleanliness of the subsequent flowing liquid, so as to improve the adsorption effect of the subsequent flowing liquid on the impurities in the steam.

[0033] Based on the same inventive concept, this embodiment discloses a high-efficiency steam waste heat recovery method, comprising the following steps: Step S1, collecting steam tail gas processed by superheated steam; Step S2, the collected steam tail gas is passed from the steam feed pipe 6 into the above-mentioned spray tower 2 for impurity removal, and at the same time, a clean liquid is passed from the liquid discharge pipe 9 into the spray tower 2 through a liquid pump, and the steam and the liquid flow relative to each other. The steam flows along the lower surface of the spiral guide blade 3 and is guided to the upper surface of the spiral guide blade 3 by the second guide surface on the bottom guide plate 14. The liquid flows along the upper surface of the spiral guide blade 3 and is guided to the lower surface of the spiral guide blade 3 by the top guide plate 13. At the same time, the guide strip 21 allows the liquid or steam to be separated in the radial direction of the spiral guide blade 3. The distribution is more uniform, the steam and the liquid are interlaced, and flow relatively at a nearly vertical angle between the top guide plate 13 and the bottom guide plate 14, thereby improving the adsorption effect of the liquid on the impurities in the steam, and the liquid adsorbing the impurities falls into the slot 15 and enters the interlayer 17 after passing through the top guide plate 13, so that the liquid adsorbing the impurities is separated from the clean liquid in time to avoid the liquid from continuously contacting with the steam. The flow of the steam brings out the impurities again, while also maintaining the cleanliness of the subsequent flowing liquid, so as to improve the adsorption effect of the subsequent flowing liquid on the impurities in the steam; Step S3, the steam after impurity removal enters the heat pump or heat exchanger through the steam discharge pipe 7 at the top of the spray tower 2; Step S4, converting the steam after impurities removal into high-temperature steam through a heat pump, or recovering heat energy in the steam after impurities removal through a heat exchanger.

[0034] The method promotes the interaction between liquid and steam through the top guide plate 13 and the bottom guide plate 14, thereby solving the problem that in traditional steam waste heat recovery, when the spray tower 2 is used to clean impurities in the steam, the interaction between steam and water flow is poor, causing some impurities to escape, affecting the subsequent heat recovery effect, so as to improve the recovery effect of steam waste heat.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency steam waste heat recovery device, characterized in that: include: A spray tower, wherein a steam feed pipe and a liquid discharge pipe are respectively provided at the bottom of the spray tower, and a steam discharge pipe and a liquid feed pipe are respectively provided at the top of the spray tower; A guide frame arranged in the spray tower comprises a main shaft arranged vertically in the spray tower, a spiral guide blade arranged on the main shaft and tightly connected to the inner wall of the spray tower, a top guide plate and a bottom guide plate arranged alternately on the upper surface and the lower surface of the spiral guide blade, the top guide plate is provided with a first guide surface facing the lower surface of the spiral guide blade, and the bottom guide plate is provided with a second guide surface facing the upper surface of the spiral guide blade; A heat pump or heat exchanger connected to the steam discharge pipe.

2. The high-efficiency steam waste heat recovery device according to claim 1 is characterized in that: The surfaces of the first guide surface and the second guide surface are both provided with a plurality of guide strips, and gaps for allowing steam or liquid to flow are formed between the guide strips.

3. The high-efficiency steam waste heat recovery device according to claim 2 is characterized in that: The guide strip is inclined from one side of the circumferential end of the spiral guide blade toward the middle of the spiral guide blade, and the width of the gap increases uniformly along the direction of steam or liquid flow.

4. A high-efficiency steam waste heat recovery device according to any one of claims 1 to 3, characterized in that: An interlayer is arranged inside the spiral guide blade, and a plurality of slots communicating with the interlayer are arranged on the spiral guide blade, wherein the slots are located at the front side of the top guide plate along the liquid flow direction.

5. The high-efficiency steam waste heat recovery device according to claim 4 is characterized in that: It also includes a separation cylinder arranged at the bottom of the spray tower, wherein a filter plate is arranged inside the separation cylinder, and a partition is arranged in the separation cylinder, which separates the separation cylinder into a liquid chamber and an impurity chamber, wherein the liquid discharge pipe is connected to the liquid chamber, and the impurity chamber is connected to an impurity box.

6. The high-efficiency steam waste heat recovery device according to claim 5, characterized in that: A rotating drum is rotatably connected inside the separation drum, and a plurality of scrapers for scraping along the surface of the filter plate are arranged on the rotating drum.

7. The high-efficiency steam waste heat recovery device according to claim 6, characterized in that: The scrapers are respectively arranged on the upper surface and the lower surface of the filter plate, and a through groove capable of accommodating the scrapers to pass through is formed between the filter plate and the partition plate.

8. A high-efficiency steam waste heat recovery device according to claim 6 or 7, characterized in that: A driving box is provided between the steam discharge pipe and the spray tower, a rotating shaft is rotatably connected in the driving box, the top of the rotating shaft is located in the driving box and is provided with fan blades, and the rotating shaft passes through the main shaft and is connected to the rotating drum.

9. An efficient steam waste heat recovery method, characterized in that: The following steps are involved: Step S1, collecting steam tail gas processed by superheated steam; Step S2, passing the collected steam tail gas into a spray tower as described in any one of claims 1 to 8 for impurity removal; Step S3, the steam after impurity removal enters the heat pump or heat exchanger through the steam discharge pipe at the top of the spray tower according to any one of claims 1 to 8; Step S4, converting the steam after impurities removal into high-temperature steam through a heat pump, or recovering heat energy in the steam after impurities removal through a heat exchanger.

10. The high-efficiency steam waste heat recovery device according to claim 9, characterized in that: In step S2, steam and liquid flow relative to each other, and steam flows along the lower surface of the spiral guide blade and is guided by the bottom guide plate to the upper surface of the spiral guide blade, and liquid flows along the upper surface of the spiral guide blade and is guided by the top guide plate to the lower surface of the spiral guide blade.

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