Deaerator steam exhaust waste heat utilization device and utilization method

Abstract

The invention provides a deaerator steam exhaust waste heat utilization device and a waste heat utilization method thereof, and the deaerator steam exhaust waste heat utilization device comprises a deaerator, a three-stage type steam exhaust heat exchange tower communicated with the deaerator, a circulating water pump communicated with the three-stage type steam exhaust heat exchange tower, a sludge pipe, a water inlet pipe and a water outlet pipe, the circulating water pump is connected with the sludge pipe, a first-stage heat exchange area, a second-stage heat exchange area and a third-stage heat exchange area are arranged in the three-stage type dead steam heat exchange tower, the first-stage heat exchange area is communicated with a steam outlet of the deaerator, the second-stage heat exchange area is arranged above the first-stage heat exchange area, the third-stage heat exchange area is arranged above the second-stage heat exchange area, and the third-stage heat exchange area is communicated with a steam outlet of the deaerator. And communicating with the circulating water pump. According to the device and the using method thereof, waste heat of dead steam of steam is fully recycled, the resistance to a sludge pipeline conveying pipeline can be reduced by 50% or above, and the sludge heat drying energy consumption saving rate can be reduced by 4% or above.

Description

Technical Field

[0001] The invention relates to the field of deaerator steam exhaust steam recycling, and in particular to a deaerator steam exhaust steam waste heat utilization device and a utilization method applied to the deaerator steam exhaust steam waste heat utilization device. Background Art

[0002] Sludge is solid waste discharged during sewage treatment. Its water content is about 80%, and it has the characteristics of high moisture, high organic matter, bad odor and viscosity.

[0003] Thermal drying + incineration is one of the current mainstream technical routes for sludge reduction and resource utilization. Incineration of high-temperature flue gas can generate steam required for sludge thermal drying through waste heat boilers, reducing auxiliary fuel consumption for sludge treatment.

[0004] The deaerator is one of the auxiliary equipment of the waste heat boiler and an important equipment for boiler feed water treatment. The long-term operation experience of sludge drying and incineration treatment shows that the deaerator will emit a large amount of low-temperature steam during operation. Due to the low temperature and pressure of the exhaust steam and the high cost of utilization, it is usually discharged directly, resulting in a great waste of energy.

[0005] On the other hand, due to the high solid content of the sludge, the sludge pipeline transportation resistance is very large and the transportation stability is low, which affects the operating stability of the sludge drying and incineration system. Summary of the invention

[0006] In response to the energy waste problem of deaerator steam exhaust in the above-mentioned prior art, as well as the disadvantages and shortcomings of large sludge pipeline transportation resistance, the present application provides a deaerator steam exhaust heat utilization device and a utilization method of the deaerator steam exhaust heat utilization device.

[0007] In order to solve the above technical problems, the present invention provides a deaerator steam exhaust waste heat utilization device, which comprises: a deaerator, a three-stage exhaust steam heat exchange tower, the three-stage exhaust steam heat exchange tower is connected to the deaerator, a circulating water pump, the circulating water pump is connected to the three-stage exhaust steam heat exchange tower, and a sludge pipe, the circulating water pump is connected to the sludge pipe, wherein a primary heat exchange zone, a secondary heat exchange zone, and a tertiary heat exchange zone are arranged in the three-stage exhaust steam heat exchange tower, the primary heat exchange zone is connected to the steam outlet of the deaerator, the secondary heat exchange zone is arranged above the primary heat exchange zone, and the tertiary heat exchange zone is arranged above the secondary heat exchange zone and is connected to the circulating water pump.

[0008] In the deaerator steam exhaust heat utilization device provided by the present invention, it can also have the following characteristics: the top of the three-stage exhaust steam heat exchange tower is also provided with a steam-water separation structure and an exhaust port located above the steam-water separation structure, and the length-to-diameter ratio of the three-stage exhaust steam heat exchange tower is 8:1 to 3:1

[0009] The deaerator steam exhaust heat utilization device provided by the present invention may also have the following feature: the steam-water separation structure is a metal wire mesh separation, an inertial separator or a centrifugal separator.

[0010] In the deaerator steam exhaust heat utilization device provided by the present invention, it can also have the following characteristics: the primary heat exchange area includes a steam coil and storage water, one end of the steam coil is connected to the steam outlet of the deaerator through a pipeline, and the other end extends into the storage water, and an exhaust hole is provided on the end extending into the storage water, and the storage water is connected to the circulating water pump.

[0011] In the deaerator steam exhaust heat utilization device provided by the present invention, it can also have the following characteristics: the secondary heat exchange zone is arranged in the necking area of ​​the three-stage exhaust steam heat exchange tower, including a sprinkling plate, and sprinkling holes are distributed on it, and the ratio of the diameter of the necking area to the wide mouth diameter of the three-stage exhaust steam heat exchange tower is 4:2 to 2:5.

[0012] In the deaerator steam exhaust heat utilization device provided by the present invention, it can also have the following characteristics: the number of the sprinkling plates is at least three, the three sprinkling plates are staggered in the necking area, and the opening area on the sprinkling plate accounts for 40% to 90% of the plate area of ​​the sprinkling plate.

[0013] In the deaerator steam exhaust heat utilization device provided by the present invention, it can also have the following characteristics: one end of the circulating water pump is connected to a casing, and the casing is wrapped around the outside of the sludge pipe; the three-stage heat exchange zone includes an atomizing spray pipe, one end of the atomizing spray pipe is connected to the casing, and the other end extends into the interior of the three-stage exhaust steam heat exchange tower, and an atomizing nozzle is provided on the end extending into the interior of the three-stage exhaust steam heat exchange tower.

[0014] The deaerator steam exhaust heat utilization device provided by the present invention may also have the following feature: the diameter of the droplets atomized by the atomizing nozzle is less than 0.5 mm.

[0015] The deaerator steam exhaust heat utilization device provided by the present invention may also have the following feature: a partition is provided between the casing and the sludge pipe.

[0016] In addition, the present invention also provides a method for utilizing waste heat of deaerator steam exhaust steam applied to the above-mentioned deaerator steam exhaust steam waste heat utilization device, comprising the following steps:

[0017] The exhaust steam from the deaerator enters the three-stage heat exchange tower through the pipeline;

[0018] The steam enters the storage water through the steam coil in the primary heat exchange area and performs primary heat exchange with the storage water;

[0019] After the primary heat exchange, the steam exhaust moves upward to the secondary heat exchange area, and performs secondary heat exchange with the water flow from the sprinkling plate in the secondary heat exchange area;

[0020] After the secondary heat exchange, the remaining steam continues to move upward to the tertiary heat exchange area, and undergoes three heat exchanges with the water vapor sprayed from the atomizing spray pipe in the tertiary heat exchange area.

[0021] The steam exhaust after three heat exchanges is separated by the steam-water separation structure and then discharged through the exhaust port.

[0022] The method for utilizing waste heat of exhaust steam from a deaerator provided by the present invention may also have the following feature: in the primary heat exchange zone, stored water passes through a circulating water pump and is wrapped around the outside of the sludge pipe through a casing to heat the sludge pipe.

[0023] In the method for utilizing waste heat of deaerator steam exhaust provided by the present invention, it can also have the following characteristics: the sleeve is connected to the atomizing spray pipe in the three-stage heat exchange area, sprayed to the interior of the three-stage exhaust steam heat exchange tower through the atomizing spray pipe, and then falls back into the storage water to realize water circulation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the deaerator steam exhaust waste heat utilization device and waste heat utilization method provided by the present invention, the device includes a deaerator, a three-stage exhaust steam heat exchange tower, a circulating water pump and a sludge pipe. Among them, the three-stage exhaust steam heat exchange tower is connected to the deaerator, and the three-stage exhaust steam heat exchange tower is respectively provided with a primary heat exchange area, a secondary heat exchange area and a tertiary heat exchange area. The steam exhaust discharged from the deaerator is subjected to three heat exchanges in the three-stage exhaust steam heat exchange tower, and the waste heat of the steam exhaust is transferred to the primary exchange area. In addition, the circulating water pump is connected to the three-stage exhaust steam heat exchange tower, and the transferred waste heat is connected to the sludge pipe, so that the sludge pipe can be heated, and the heated circulating water is returned to the primary heat exchange area through the three-stage heat exchange area to realize water circulation. Based on the deaerator steam exhaust waste heat utilization device, the waste heat is used to increase the sludge temperature and reduce its flow resistance, thereby fully realizing the reuse of the waste heat of the steam exhaust. It can not only reduce the resistance of the sludge pipeline by more than 50%, but also achieve an energy saving rate of more than 4% for sludge thermal drying.

[0026] In addition, the top of the three-stage exhaust steam heat exchange tower is also provided with a steam-water separation structure and an exhaust port located above the separation structure. The steam-water separation structure is a metal mesh separation, an inertial separator or a centrifugal separator, through which the non-condensable gas and atomized droplets in the exhaust steam after the three-stage heat exchange are separated, and then the non-condensable gas therein is discharged to the outside through the exhaust port.

[0027] In addition, the primary heat exchange area includes a steam coil and stored water, and an exhaust hole is provided on one end of the steam coil extending into the stored water. The steam exhaust discharged from the deaerator passes through the steam coil and is divided into small air flows through the exhaust holes on the steam coil, and enters the stored water to perform primary heat exchange with the stored water.

[0028] In addition, the secondary heat exchange area is a sprinkling plate, which is arranged in the contraction area of ​​the heat exchange tower and staggered in the exchange area. By utilizing the structural characteristics of the staggered distribution, the exhaust steam after the primary heat exchange moves upward in an S-shaped flow pattern and undergoes a strong secondary heat exchange with the water flow sprinkling from the sprinkling plate.

[0029] In addition, the third-stage heat exchange area is an atomizing spray pipe, one end of which is connected to the sleeve and the other end is provided with an atomizing nozzle. The sleeve is connected to the circulating water pump and wrapped around the outside of the sludge pipe. The stored water in the first-stage heat exchange area carries the residual heat after the first-stage heat exchange, flows to the sleeve through the circulating water pump, heats the sludge pipe, and the heated water is sprayed out through the atomizing spray pipe and returns to the first-stage heat exchange area, fully utilizing the residual heat of the steam exhaust to heat the sludge pipe while realizing water circulation.

[0030] Moreover, a partition is provided between the sleeve and the sludge pipe, and the partition is utilized to realize uniform heating of the sludge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : is a structural schematic diagram of a deaerator steam exhaust steam waste heat utilization device in this embodiment;

[0032] Figure 2 Schematic diagram of the structure of the three-stage exhaust steam heat exchange tower in this embodiment;

[0033] Figure 3 It is a schematic diagram of the structure of the secondary heat exchange zone in this embodiment. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The deaerator steam exhaust waste heat utilization device is used for heat exchange of the waste heat of the deaerator steam exhaust, and utilizes the exchanged waste heat to heat the sludge pipe, thereby improving the transportation performance of the sludge pipe.

[0036] like Figures 1 to 3As shown in FIG. 1 , the deaerator steam exhaust heat utilization device includes a deaerator 10, a three-stage exhaust steam heat exchange tower 20, a circulating water pump 30 and a sludge pipe 40. Figures 1 to 3 In the figure, the dotted line A is the flow direction of circulating water, the dotted line B is the movement direction of waste heat steam and exhaust steam, and the solid black arrow is the transportation direction of sludge.

[0037] As one of the auxiliary equipment of the waste heat boiler, the deaerator 10 discharges a large amount of steam during its operation.

[0038] like Figure 2 As shown, the three-stage exhaust steam heat exchange tower 20 is connected to the exhaust steam outlet of the deaerator 10. The three-stage exhaust steam heat exchange tower 20 is provided with a primary heat exchange area 21, a secondary heat exchange area 22, a tertiary heat exchange area 23, a steam-water separation structure 24 and an exhaust port 25 from bottom to top. In addition, the length-to-diameter ratio of the three-stage exhaust steam heat exchange tower 20 is 8:1 to 3:1.

[0039] The primary heat exchange zone 21 is disposed at the bottom end of the three-stage exhaust steam heat exchange tower 20 , and includes a steam coil 211 and stored water 212 .

[0040] The storage water 212 is filled at the bottom of the three-stage exhaust steam heat exchange tower 20 . One end of the steam coil 211 extends out of the three-stage exhaust steam heat exchange tower 20 and is connected to the exhaust steam outlet of the deaerator 10 . The other end extends into the storage water 212 .

[0041] A plurality of exhaust holes are provided on one end of the steam coil 211 extending into the storage water 212. The plurality of exhaust holes 213 are evenly distributed on the steam coil 211. The arrangement of the plurality of exhaust holes allows the exhaust steam entering the steam coil 211 to form multiple small airflows that enter the storage water 212 and perform a heat exchange with the storage water 212.

[0042] The secondary heat exchange area 22 is arranged in the middle constriction area 221 of the three-stage exhaust steam heat exchange tower 20, and is located above the primary heat exchange area 21. The constriction area 221 is a protrusion extending outward from the inner side wall of the three-stage exhaust steam heat exchange tower 20, so that the diameter of this area becomes smaller. The diameter ratio of the constriction area 221 to the wide diameter of the three-stage exhaust steam heat exchange tower 20 is 4:2 to 2:5.

[0043] like Figure 3As shown, the secondary heat exchange area 22 includes at least three staggeredly distributed sprinkling plates 222. In this embodiment, there are three sprinkling plates 222, and the three sprinkling plates 222 are fixed on the necking area 221 in sequence at a certain interval from bottom to top. The bottom sprinkling plate 222 and the top sprinkling plate 222 are fixed on one side of the necking area 221, and the middle sprinkling plate 222 is fixed on the other side of the necking area 221, so that the three sprinkling plates 222 can be staggered. With the staggered sprinkling plate 222 structure, the steam exhaust gas can present an S-shaped airflow when passing through the sprinkling plate 222, so that it can perform sufficient heat exchange.

[0044] In addition, the sprinkling plate 222 is provided with a plurality of sprinkling holes 223 with openings facing downwards, and the water in the sprinkling plate 222 is poured out from the sprinkling holes 223, and then contacts with the steam exhaust steam rising after the primary heat exchange, and then performs secondary heat exchange. And the opening area of ​​all the sprinkling holes 223 on the sprinkling plate 222 together accounts for 40% to 90% of the area of ​​the sprinkling plate 222.

[0045] The tertiary heat exchange area 23 is arranged above the secondary heat exchange area 22, and includes an atomizing spray pipe 231, one end of which extends out of the three-stage exhaust steam heat exchange tower 20. A plurality of mist nozzles 232 are arranged on the upper tube wall on one side of the three-stage exhaust steam heat exchange tower 20.

[0046] The atomizing spray pipe 231 is filled with water, which is sprayed downward after being atomized by the atomizing nozzle 232, and the diameter of the sprayed droplets is less than 0.5 mm. The droplets perform a third heat exchange with the steam exhaust steam after the secondary heat exchange moving upward.

[0047] The steam-water separation structure 24 is arranged at the top of the three-stage exhaust steam heat exchange tower 20, and is located above the three-stage heat exchange area 23. The steam-water separation structure 24 is a metal mesh separator, an inertial separator or a centrifugal separator. Through the arrangement of the steam-water separation structure 24, the exhaust steam after three heat exchanges is separated into steam and water.

[0048] The exhaust port 25 is located above the steam-water separation structure 24. The non-condensable gas passing through the steam-water separation structure 24 is discharged from the exhaust port 25.

[0049] One end of the circulating water pump 30 is connected to the stored water 212 in the primary heat exchange area 21 through a pipeline, and the other end is connected to the casing 31. The sludge pipe 40 is used to transport sludge.

[0050] The sleeve 31 is wrapped around the outside of the sludge pipe 40 , and a partition is provided between the sleeve 31 and the sludge pipe 40 .

[0051] The casing 31 contains the stored water that has undergone a heat exchange and is pumped by the circulating water pump 30. The heat of the stored water can be used to heat the sludge pipe 40, and the sludge pipe 40 can be evenly heated by the partition plate, thereby reducing the transportation resistance of the sludge pipe 40.

[0052] Furthermore, the other end of the sleeve 31 is connected to the atomizing spray pipe 231, so that the water stored inside can be sprayed out from the atomizing nozzle 232 after releasing the heat, and finally fall back into the primary heat exchange area 21 to realize water circulation.

[0053] In addition, according to the above-mentioned deaerator steam exhaust heat utilization device, the method for utilizing the exhaust heat of the steam comprises the following steps:

[0054] The steam exhaust from the deaerator enters the three-stage heat exchange tower through the pipeline for heat exchange;

[0055] First, the steam exhaust enters the steam coil through the pipeline, and then passes through the exhaust holes on the steam coil to form multiple small airflows into the stored water, and performs a heat exchange with the stored water;

[0056] After the first heat exchange, the steam exhaust continues to move upwards, and at this time, enters the secondary heat exchange area. Then, based on the staggered distribution of the sprinkling plates in the secondary heat exchange area, the airflow moves upwards in an S-shaped manner, and at the same time, performs a secondary heat exchange with the water flow from the sprinkling plates;

[0057] After the secondary heat exchange, the steam exhaust continues to move upward to the tertiary heat exchange area, and then undergoes a third heat exchange with the water vapor sprayed from the atomizing spray pipe in the tertiary heat exchange area.

[0058] Finally, the steam exhaust after three heat exchanges is separated by the steam-water separation structure, and the non-condensable gas therein is discharged through the exhaust port.

[0059] In addition, in the above-mentioned utilization method, in the primary heat exchange area, the stored water is pumped by the circulating water pump and transported to the sleeve wrapped outside the sludge pipe, and then the heat of the stored water in the primary heat exchange is used to heat the sludge pipe. Moreover, the other end of the sleeve is connected to the atomizing spray pipe in the tertiary heat exchange area, sprayed to the inside of the three-stage exhaust steam heat exchange tower through the atomizing spray pipe, and then falls back into the stored water to realize water circulation.

[0060] According to the deaerator steam exhaust waste heat utilization device and its utilization method in the above-mentioned embodiment, the device includes a deaerator, a three-stage exhaust steam heat exchange tower, a circulating water pump and a sludge pipe. Among them, the three-stage exhaust steam heat exchange tower is connected to the deaerator, and the three-stage exhaust steam heat exchange tower is respectively provided with a primary heat exchange area, a secondary heat exchange area and a tertiary heat exchange area. The steam exhaust discharged from the deaerator is subjected to three heat exchanges in the three-stage exhaust steam heat exchange tower, and the waste heat of the steam exhaust is transferred to the primary exchange area. In addition, the circulating water pump is connected to the three-stage exhaust steam heat exchange tower, and the transferred waste heat is connected to the sludge pipe, so that the sludge pipe can be heated, and the heated circulating water is returned to the primary heat exchange area through the three-stage heat exchange area to realize water circulation. Based on the deaerator steam exhaust waste heat utilization device, the waste heat is used to increase the sludge temperature and reduce its flow resistance, thereby fully realizing the reuse of the waste heat of the steam exhaust. It can not only reduce the resistance of the sludge pipeline by more than 50%, but also achieve an energy saving rate of more than 4% for sludge thermal drying.

[0061] In addition, the top of the three-stage exhaust steam heat exchange tower is also provided with a steam-water separation structure and an exhaust port located above the separation structure. The steam-water separation structure is a metal mesh separation, an inertial separator or a centrifugal separator, through which the non-condensable gas and atomized droplets in the exhaust steam after the three-stage heat exchange are separated, and then the non-condensable gas therein is discharged to the outside through the exhaust port.

[0062] In addition, the primary heat exchange area includes a steam coil and stored water, and an exhaust hole is provided on one end of the steam coil extending into the stored water. The steam exhaust discharged from the deaerator passes through the steam coil and is divided into small air flows through the exhaust holes on the steam coil, and enters the stored water to perform primary heat exchange with the stored water.

[0063] In addition, the secondary heat exchange area is a sprinkling plate, which is arranged in the contraction area of ​​the heat exchange tower and staggered in the exchange area. By utilizing the structural characteristics of the staggered distribution, the exhaust steam after the primary heat exchange moves upward in an S-shaped flow pattern and undergoes a strong secondary heat exchange with the water flow sprinkling from the sprinkling plate.

[0064] In addition, the third-stage heat exchange area is an atomizing spray pipe, one end of which is connected to the sleeve and the other end is provided with an atomizing nozzle. The sleeve is connected to the circulating water pump and wrapped around the outside of the sludge pipe. The stored water in the first-stage heat exchange area carries the residual heat after the first-stage heat exchange, flows to the sleeve through the circulating water pump, heats the sludge pipe, and the heated water is sprayed out through the atomizing spray pipe and returns to the first-stage heat exchange area, fully utilizing the residual heat of the steam exhaust to heat the sludge pipe while realizing water circulation.

[0065] Moreover, a partition is provided between the sleeve and the sludge pipe, and the partition is utilized to realize uniform heating of the sludge pipe.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and the equivalent technology, the present application is also intended to include these modifications and variations.

Claims

1. A deaerator steam exhaust heat utilization device, characterized in that: include: Deaerator, A three-stage exhaust steam heat exchange tower, wherein the three-stage exhaust steam heat exchange tower is connected to the deaerator, a circulating water pump, the circulating water pump being connected to the three-stage exhaust steam heat exchange tower, A sludge pipe, the circulating water pump is connected to the sludge pipe, The three-stage exhaust steam heat exchange tower is provided with a primary heat exchange zone, a secondary heat exchange zone, and a tertiary heat exchange zone. The primary heat exchange zone is in communication with the steam outlet of the deaerator, The secondary heat exchange area is arranged above the primary heat exchange area. The tertiary heat exchange area is arranged above the secondary heat exchange area and is communicated with the circulating water pump.

2. The deaerator steam exhaust heat utilization device according to claim 1, characterized in that: The top of the three-stage exhaust steam heat exchange tower is also provided with a steam-water separation structure and an exhaust port located above the steam-water separation structure. The length-to-diameter ratio of the three-stage exhaust steam heat exchange tower is 8:1 to 3:

1.

3. The deaerator steam exhaust heat utilization device according to claim 2 is characterized in that: The steam-water separation structure is a metal mesh separator, an inertial separator or a centrifugal separator.

4. The deaerator steam exhaust heat utilization device according to claim 1, characterized in that: The primary heat exchange area includes a steam coil and stored water. One end of the steam coil is connected to the steam outlet of the deaerator through a pipeline, and the other end extends into the stored water, and an exhaust hole is provided on the end extending into the stored water. The stored water is communicated with the circulating water pump.

5. The deaerator steam exhaust heat utilization device according to claim 1, characterized in that: The secondary heat exchange area is arranged in the necking area of ​​the three-stage exhaust steam heat exchange tower, and includes a sprinkling plate with sprinkling holes distributed thereon. The ratio of the diameter of the necking zone to the wide diameter of the three-stage exhaust steam heat exchange tower is 4:2 to 2:

5.

6. The deaerator steam exhaust heat utilization device according to claim 5, characterized in that: The number of the sprinkling plates is at least three, and the three sprinkling plates are staggeredly distributed in the necking area. The opening area on the sprinkling plate accounts for 40% to 90% of the plate area of ​​the sprinkling plate.

7. The deaerator steam exhaust heat utilization device according to claim 1, characterized in that: One end of the circulating water pump is connected to a casing, which is wrapped around the outside of the sludge pipe; The three-stage heat exchange zone includes an atomizing spray pipe, one end of which is connected to the sleeve, and the other end extends into the interior of the three-stage exhaust steam heat exchange tower, and an atomizing nozzle is arranged on the end extending into the interior of the three-stage exhaust steam heat exchange tower.

8. The deaerator exhaust steam waste heat utilization device according to claim 7, characterized in that: The diameter of the droplets atomized by the atomizing nozzle is less than 0.5 mm.

9. The deaerator exhaust steam waste heat utilization device according to claim 7, characterized in that: A partition is arranged between the sleeve and the sludge pipe.

10. A method for utilizing waste heat from exhaust steam of a deaerator, characterized in that: The deaerator steam exhaust heat utilization device as claimed in any one of claims 1 to 9 comprises the following steps: The exhaust steam from the deaerator enters the three-stage heat exchange tower through the pipeline; The steam enters the storage water through the steam coil in the primary heat exchange area and performs primary heat exchange with the storage water; After the primary heat exchange, the steam exhaust moves upward to the secondary heat exchange area, and performs secondary heat exchange with the water flow from the sprinkling plate in the secondary heat exchange area; After the secondary heat exchange, the remaining steam continues to move upward to the tertiary heat exchange area, and undergoes three heat exchanges with the water vapor sprayed from the atomizing spray pipe in the tertiary heat exchange area. The steam exhaust after three heat exchanges is separated by the steam-water separation structure and then discharged through the exhaust port.

11. The method for utilizing waste heat of exhaust steam from a deaerator according to claim 10, characterized in that: In the primary heat exchange area, the stored water passes through a circulating water pump and is wrapped around the sludge pipe through a casing to heat the sludge pipe.

12. The method for utilizing waste heat of exhaust steam from a deaerator according to claim 11, characterized in that: The sleeve is connected to the atomizing spray pipe in the three-stage heat exchange area, sprayed to the interior of the three-stage exhaust steam heat exchange tower through the atomizing spray pipe, and then fell back into the storage water to achieve water circulation.

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