Flue gas heat exchange and condensation system of spray tower

Abstract

The utility model discloses a spray tower flue gas heat exchange and condensation system which comprises a spray drying tower, a heat exchange and condensation assembly, a hot gas recycling assembly and a water collection tank, the spray drying tower is provided with a gas inlet and a tail gas outlet, the heat exchange and condensation assembly comprises a heat exchange device and a condensation device, and the heat exchange device is provided with a flue gas heat exchange area and an air heat exchange area which are separated from each other. The flue gas heat exchanger and the air heat exchanger are connected through a heat pipe, the hot gas recycling assembly is connected with a gas inlet of the spray drying tower and a hot gas outlet of the heat exchange condensation assembly, and the water collecting tank is communicated with a liquid outlet. Through the condensing device, water vapor in the tail gas is separated from flue gas and then discharged into the atmosphere, and moisture in the tail gas is recycled after condensation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas treatment, in particular to a spray tower flue gas heat exchange and condensation system. BACKGROUND

[0002] The spray drying tower is a device widely used in food, medicine, building materials and other industries to dry materials quickly. Its working principle is to use a heater to heat the incoming air, and the hot air is in instantaneous contact with the atomized liquid product, so that the water in the product evaporates quickly, and then the dried product powder is collected, and the tail gas is discharged from the chimney after dust removal. In actual production process, a large amount of energy is consumed to heat the air to obtain hot air. More importantly, the directly discharged tail gas is usually as high as 90 degrees Celsius. Such high temperature tail gas not only brings great difficulty to the subsequent tail gas treatment work, increases the treatment cost and technical difficulty, but also easily pollutes the environment with dust, which does not meet the current concept and requirement of environmental protection production. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems existing in the prior art.

[0004] The present application provides a spray tower flue gas heat exchange and condensation system, which comprises a spray drying tower, a heat exchange and condensation assembly, a hot gas recycling assembly and a water collecting tank. The spray drying tower has an air inlet and a tail gas outlet. The heat exchange and condensation assembly comprises a heat exchange device and a condensation device. The heat exchange device has a flue gas heat exchange zone and an air heat exchange zone which are separated from each other. The flue gas heat exchange zone has a flue gas inlet and a flue gas outlet. The flue gas inlet is communicated with the tail gas outlet. The air heat exchange zone has an air inlet and a hot gas outlet. The condensation device has a second air inlet, an exhaust outlet and a liquid outlet. The flue gas outlet is communicated with the first air inlet. The hot gas recycling assembly is connected with the air inlet of the spray drying tower and the hot gas outlet of the heat exchange and condensation assembly respectively, and is used for conveying the hot gas generated after heat exchange of the heat exchange and condensation assembly. The water collecting tank is communicated with the liquid outlet and is used for collecting the condensed or dehydrated liquid.

[0005] The spray tower flue gas heat exchange and condensation system provided by the present application has at least the following beneficial effects: the heat in the tail gas is used for heat exchange to heat a certain amount of ambient air through the heat exchange device, which not only efficiently recovers the heat in the tail gas of the spray drying tower, but also reduces the temperature of the tail gas to the dew point through the condensation device, realizes the separation of water vapor in the tail gas from the flue gas before being discharged into the atmosphere, and recovers the water in the tail gas after condensation, so as to achieve the effect of energy saving, emission reduction and water saving, reduce the cost and improve the utilization rate of water resources.

[0006] According to some technical solutions of the present application, the spray tower heat exchange condensing system further comprises a tail gas purification device for pretreating tail gas of the spray drying tower, the tail gas purification device has an air inlet end and an air outlet end, the air inlet end is connected with the tail gas outlet through a pipeline, and the air outlet end is connected with the flue gas inlet through a pipeline.

[0007] According to some technical solutions of the present application, the spray tower flue gas heat exchange condensing system further comprises a demisting device which is in communication with the exhaust port and is used for further reducing the water content of the exhaust gas.

[0008] According to some technical solutions of the present application, the demisting device comprises a hollow tower body, a demisting device and an exhaust cylinder, the hollow tower body is connected with the heat exchange condensing assembly and is arranged above the water collecting tank, the demisting device is arranged in the hollow tower body, the hollow tower body is provided with an air outlet, and the exhaust cylinder is connected with the upper end of the hollow tower body.

[0009] According to some technical solutions of the present application, the demisting device is provided with multiple layers, and the multiple layers of the demisting device are sequentially arranged in the hollow tower body from bottom to top.

[0010] According to some technical solutions of the present application, the demisting device further comprises a spraying device, the spraying device comprises multiple spray heads and a spraying pipeline, the multiple spray heads are arranged in the hollow tower body, and the spraying pipeline is connected with the multiple spray heads.

[0011] According to some technical solutions of the present application, the spray tower flue gas heat exchange condensing system further comprises a condensate water recycling system, the condensate water recycling system comprises a condensate water collecting pool, a recycling pool and a liquid pumping pump, the condensate water collecting pool is connected with the recycling pool through a purification device, the condensate water collecting pool is connected with the water collecting tank through a pipeline, and the recycling pool is connected with the spraying pipeline through the liquid pumping pump.

[0012] According to some technical solutions of the present application, the condensing device comprises a refrigerant circulating device, a cooler and a condensate water guiding part, the refrigerant circulating device is connected with the cooler, the condensate water guiding part is arranged at the bottom of the cooler and is in communication with the liquid outlet, and is used for guiding the condensate to flow out along the liquid outlet.

[0013] According to some technical solutions of the present application, the hot gas recycling assembly comprises a fan, a hot gas pipeline and a hot gas interface, the air inlet of the fan is connected with the hot gas outlet, the air outlet of the fan is connected with the air inlet through the hot gas pipeline, and the hot gas interface is connected with the hot gas pipeline and is used for being connected with other production components to provide hot gas.

[0014] According to some technical solutions of the present application, the heat exchange device is a tubular heat exchanger or a plate heat exchanger.

[0015] Additional aspects and advantages of the present application will be partially given in the following description, and partially will become apparent to those skilled in the art from the following description, or can be learned by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0017] Fig. 1 The first schematic diagram of the heat exchange condensing system provided for the embodiment of the present application is shown in the figure.

[0018] Fig. 2 The second schematic diagram of the heat exchange condensing system provided for the embodiment of the present application is shown in the figure.

[0019] Fig. 3 The third schematic diagram of the heat exchange condensing system provided for the embodiment of the present application is shown in the figure.

[0020] Fig. 4 The structural schematic diagram of the heat exchange condensing assembly provided for the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

[0022] In the description of the present application, it should be understood that the terms "first", "second" and the like are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Involving the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0023] The spray drying production process is a process of obtaining a relatively dry powder material by evaporating water in the material slurry, and its advantages are high drying efficiency of fluid material, stable moisture control of final product, and mature and simple production process.

[0024] The spray drying tower is used in the drying process, which is a system device for drying materials in a short time by using a high-pressure pump to atomize the material slurry into 10-200 mist particles at a pressure of 70-200 atmospheres, and then performing heat exchange after direct contact with hot air. As a new material drying process, the drying speed is extremely fast. After centrifugal spraying, the surface area of the material liquid is greatly increased, and in the high-temperature gas flow, 95%-98% of the water can be evaporated instantly, and the drying time is only a few seconds. However, in the related technical solutions, the high-temperature tail gas of the spray drying tower is directly discharged to the outside, and a large amount of dust or water vapor pollutes the environment to a large extent, and also wastes a large amount of energy and water resources.

[0025] Based on the above, the embodiment of the present application provides a spray drying tower heat exchange and condensation system, which is described below in combination with Figs. 1 to 4 The embodiment of the present application is described.

[0026] The system includes a spray drying tower 100, a heat exchange and condensation assembly 200, a hot gas recycling assembly 300, and a water collecting tank 400.

[0027] The spray drying tower 100 has a first air inlet 101 and a tail gas outlet 102;

[0028] The heat exchange and condensation assembly 200 includes a heat exchange device 210 and a condensation device 220. The heat exchange device 210 has a flue gas heat exchange zone 211 and an air heat exchange zone 212 separated from each other. The flue gas heat exchange zone 211 has a flue gas inlet 213 and a flue gas outlet 214. The flue gas inlet 213 is in communication with the tail gas outlet 102. The air heat exchange zone 212 has an air inlet 215 and a hot gas outlet 216. The condensation device 220 has a second air inlet 221, an exhaust port 222, and a liquid discharge port 223. The flue gas outlet 214 is in communication with the first air inlet 101. Optionally, the flue gas heat exchange zone 211 and the air heat exchange zone 212 can be connected by a heat pipe 230. Still optionally, the heat exchange device 210 can be a tubular heat exchanger or a plate heat exchanger.

[0029] The hot gas recycling assembly 300 is connected with the first air inlet 101 of the spray drying tower 100 and the hot gas outlet 216 of the heat exchange and condensation assembly 200, respectively, for conveying the hot gas generated after heat exchange of the heat exchange and condensation assembly 200. Thus, not only can the tail gas heat be recovered, but also the new air in the spray drying tower 100 can be preheated, reducing heat consumption.

[0030] The water collecting tank 400 is in communication with the liquid discharge port 223 for collecting the liquid after condensation or dehydration.

[0031] After the exhaust gas of the spray drying tower 100 is discharged, the exhaust gas carrying residual heat enters the flue gas heat exchange zone 211 from the flue gas inlet 213 of the heat exchange device 210, absorbs heat from the ambient air in the air heat exchange zone 212 on the other side of the heat pipe 230, so that the exhaust gas is cooled and then discharged from the flue gas outlet 214 into the condensing device 220, and the water vapor in the exhaust gas is condensed and separated from the flue gas. In particular, when the flue gas reaches a temperature below the dew point, a large amount of water vapor contained in the flue gas rapidly condenses and dehydrates. Ambient air at room temperature can be blown into the air heat exchange zone 212 through the air inlet 215 by the air blower 310, and after entering the air heat exchange zone 212, the air is heated and exchanges heat, and then is sent out through the hot air outlet 216 after being heated by the heat exchange device 210. The hot air sent out can be used to preheat the fresh air in the spray drying tower 100 or for other processes, and finally is discharged into the atmosphere after being treated.

[0032] Therefore, by performing isenthalpic heat exchange and cooling on the exhaust gas of the spray drying tower 100, the water vapor in the flue gas is separated from the flue gas and recovered by condensation. At the same time, the heat in the flue gas is recovered to heat a certain amount of ambient air, which can be reused for drying or other production purposes, achieving the effect of energy saving and consumption reduction. The exhaust gas of the spray drying tower 100 is directly discharged into the atmosphere, which is changed to a gas-gas isenthalpic heat exchange and condensation system, which absorbs the heat of the exhaust gas to heat and recover a certain amount of ambient air for production, while reducing the temperature of the exhaust gas to below the dew point, realizing the separation of water vapor from the flue gas and the condensation and dehydration of the exhaust gas before being discharged into the atmosphere, achieving the purpose of energy saving and emission reduction and water saving.

[0033] During the drying process of the spray drying tower 100, part of the material will be discharged with the exhaust gas in the form of dust, which will easily cause the connection pipeline to be blocked if accumulated in the pipeline, affecting the normal operation of the subsequent process. Therefore, in some embodiments, the heat exchange and condensation system is also provided with an exhaust gas purification device 500 for pretreating the exhaust gas of the spray drying tower 100. The device has an air inlet end and an air outlet end. The air inlet end of the device is connected to the exhaust gas outlet 102 of the spray drying tower 100 through a pipeline, and the air outlet end is connected to the flue gas inlet 213 through a pipeline.

[0034] Optionally, the exhaust gas treatment device can be any one of a bag filter, a wind tube dust collector, a filter screen dust collector, a water curtain dust collector, etc. The actual setting can be determined according to the dust removal requirements and the use scene. For example, when treating large wind volume dust-containing exhaust gas, a bag filter can be set. After the dust-containing exhaust gas enters the air inlet end, it enters the filter chamber provided with filter bags. When the airflow passes through the filter bags, the dust is trapped on the outer surface of the filter bags, and the purified gas enters the clean gas chamber through the filter bags, and is finally discharged from the air outlet end, effectively reducing the dust content in the exhaust gas.

[0035] Particularly, if there is a higher requirement for tail gas emission, a combination of filter screen dust collector and bag dust collector can also be used. After the two are connected and combined, the filter screen dust collector is used for rough filtration to intercept large particle dust, and the bag dust collector is used for further fine filtration to achieve efficient dust removal. Alternatively, according to the process requirements, a more fine dust removal device or a combination of other dust collectors can also be selected to preliminarily treat the spray tower tail gas. Therefore, after passing through the tail gas purification device 500, dust can be effectively captured to provide relatively clean gas for subsequent processes, thereby reducing the processing burden of subsequent equipment.

[0036] In some embodiments, the spray drying tower 100 heat exchange condensing system further comprises a demisting device 600 which is in communication with the exhaust port 222 for further reducing the water content of the exhaust gas.

[0037] Specifically, the demisting device 600 comprises a hollow tower body 610, a demister 620 and an exhaust cylinder 630. The hollow tower body 610 is connected with the heat exchange condensing assembly 200 and is arranged above the water collecting tank 400. The demister 620 is arranged in the hollow tower body 610. The hollow tower body 610 is provided with an air outlet. The exhaust cylinder 630 is connected with the air outlet at the upper end of the hollow tower body 610. When the tail gas passes through the demisting device 600, the flow rate is first reduced, and then when passing through the demister 620, the demister 620 includes a demisting plate. The remaining water vapor particles in the tail gas collide with and are adsorbed by the demisting plate of the demister 620 to separate from the flue gas, further reducing the water vapor content in the tail gas, and finally the demisted tail gas is discharged into the atmosphere through the exhaust cylinder 630.

[0038] When the flue gas carries excessive dust or slurry droplets, the dust is easy to accumulate and harden on the demister 620, causing the demister 620 to be blocked. After the demister 620 is blocked, the resistance of the flue gas passing through is increased, and the demisting efficiency is reduced. Therefore, the demisting device 600 further comprises a spraying device 700. The spraying device 700 comprises a plurality of spray heads 720 and a spraying pipeline 710. The spray heads 720 are arranged in the hollow tower body 610, and the spraying pipeline 710 is connected with the plurality of spray heads 720. The number and arrangement interval of the spray heads 720 can be determined according to the cross-sectional range of the demisting plate, as long as the water flow of the spray heads 720 can cover the cross section. In this way, the spraying device 700 can periodically remove the liquid droplets and dust captured on the demisting plate blades of the demister 620, thereby keeping the blade surface clean and preventing blade fouling and blockage.

[0039] Further, the mist eliminator 620 is provided with multiple layers, and the multiple layers of mist eliminator 620 are sequentially arranged in the hollow tower body 610 from bottom to top. In actual arrangement, the mist eliminator 620 can be arranged as two layers, three layers or multiple layers according to needs. For example, the mist eliminator 620 is arranged as two layers from bottom to top, each of the mist eliminators 620 is provided with a mist eliminator plate capable of covering the cross section of the tower body, the bottom layer is used for capturing large droplets, and the subsequent layers are configured to process smaller droplets. The two-layer structure not only can increase the processing time and contact area, but also can intercept droplets of different particle sizes step by step, thereby improving the separation efficiency. In addition, when a layer is blocked or the efficiency is reduced, the other layers can still maintain the basic separation function, thereby ensuring the continuous and stable operation of the mist eliminator 600. Therefore, by increasing the number of mist elimination layers, the mist elimination efficiency is further improved, so that the mist in the tail gas is more thoroughly separated. Correspondingly, multiple spray devices 700 for water flushing on the mist eliminator plates are arranged between the multiple layers of mist eliminator 620.

[0040] In some embodiments, the condensing device 220 comprises a refrigerant circulating device 224, a cooler 225, and a condensate water guiding part 226. The refrigerant circulating device 224 is connected with the cooler 225, and the condensate water guiding part 226 is arranged at the bottom of the cooler 225 and is communicated with the liquid outlet 223 for guiding the condensate water to flow out along the liquid outlet 223. In actual arrangement, the condensate coil 227 or condensate plate can be arranged in the cooler 225 and connected with the refrigerant circulating device 224, and the condensate water guiding part 226 can be arranged to be inclined at both ends along the liquid outlet 223.

[0041] When the refrigerant circulating device 224 works, the refrigerant is pushed to circulate in the system. In the circulation process, the refrigerant absorbs the heat in the cooler 225, so that the temperature inside the cooler 225 is reduced. The tail gas discharged from the flue gas heat exchange zone 211 of the heat exchange device 210 enters the cooler 225, and in the cooler 225, the water vapor and the like in the tail gas can be condensed to change from gaseous state to liquid state and adhere to the inner surface of the cooler 225 to form condensate water. Since the condensate water guiding part 226 is arranged at the bottom of the cooler 225 and is inclined at both ends, the accumulated condensate water can flow along the inclined direction after falling, and is guided to the liquid outlet 223, and then flows out from the liquid outlet 223 to enter the water collecting tank 400 for collection.

[0042] In some embodiments, the spray drying tower heat exchange condensing system further comprises a condensate water recycling system 800, which comprises a condensate water collecting pool 810, a recycling pool 820, and a liquid pumping pump 830. The condensate water collecting pool 810 is connected with the recycling pool 820 through a purification device, the condensate water collecting pool 810 is connected with the water collecting tank 400 through a pipeline, and the recycling pool 820 is connected with the spray pipeline 710 through the liquid pumping pump 830.

[0043] To realize the utilization of the condensed water, in some specific embodiments, the heat exchange condensing system further comprises a condensed water recycling system 800, the water collecting tank 400 is provided with an overflow port 401, the collected liquid is discharged along the overflow port 401, and the overflow port 401 is connected with a pipeline, so that the condensed water is discharged along the pipeline into the condensed water collecting and recycling system. Specifically, the condensed water recycling system 800 comprises a condensed water collecting pool 810, a recycling pool 820 and a liquid pumping pump 830, the condensed water collecting pool 810 is connected with the water collecting tank 400 through a pipeline, and the condensed water in the water collecting tank 400 is discharged into the collecting pool and introduced into the condensed water collecting pool 810 through the pipeline for storage.

[0044] Further, the condensed water collecting pool 810 is connected with the recycling pool 820 through a purification device, so that the condensed water in the collecting pool is treated by the purification device to remove impurities and other pollutants in the condensed water and then enters the recycling pool 820, the recycling pool 820 is connected with the spraying pipeline 710 through the liquid pumping pump 830, and the condensed water in the recycling pool 820 is transported to the spraying pipeline 710 under the action of the liquid pumping pump 830 for subsequent spraying and demisting process, thereby realizing the recycling of water resources. In addition, the purified water in the recycling pool 820 can also be recycled as other process water, for example, the purified water is pumped to a ceramic raw material ball mill for utilization. Thus, the water condensed by the heat exchange is collected in the condensed water pool and recycled for production and demisting spraying.

[0045] In some embodiments, the hot gas recycling assembly 300 comprises a fan 310, a hot gas pipeline 320 and a hot gas interface 330, the air inlet of the fan 310 is connected with the hot gas outlet, the air outlet of the fan 310 is connected with the first air inlet 101 through the hot gas pipeline 320, and the hot gas interface 330 is connected with the hot gas pipeline 320 for connection with other production components to provide hot gas. Through the fan 310 and the hot gas pipeline 320, a certain amount of ambient air heated by the gas-gas equal-enthalpy heat exchange and condensed water system is sent to the spray drying tower 100 or other production units, so as to realize the full recycling of the tail gas heat energy of the spray drying tower 100 and realize energy saving and emission reduction.

[0046] In addition, certain terms have been used in this specification to describe embodiments of the specification. For example, "one embodiment", "an embodiment" and / or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. Therefore, it can be emphasized and should be understood that two or more references to "embodiments" or "one embodiment" in various parts of the specification do not necessarily all refer to the same embodiment. In addition, specific features, structures or characteristics can be appropriately combined in one or more embodiments of the specification.

[0047] The preferred embodiments of the present application have been disclosed with specific reference to a preferred embodiment. A person with ordinary skill in the art would understand that variations in the preferred embodiments that do not depart from the spirit and scope of the application are within the scope of the present application. It is, therefore, intended that such variations be included within the present application's full range of equivalency, so as to be within their scope.

Claims

1. A spray tower flue gas heat exchange condensing system characterized by: The application relates to a flue gas treatment system, comprising: a spray drying tower with a first gas inlet and a tail gas outlet; a heat exchange and condensation assembly comprising a heat exchange device and a condensation device, the heat exchange device having a flue gas heat exchange zone and an air heat exchange zone separated from each other, the flue gas heat exchange zone having a flue gas inlet and a flue gas outlet, the flue gas inlet being communicated with the tail gas outlet, the air heat exchange zone having an air inlet and a hot gas outlet, the condensation device having a second gas inlet, an exhaust outlet and a liquid outlet, the flue gas outlet being communicated with the first gas inlet; a hot gas recycling assembly connected with the gas inlet of the spray drying tower and the hot gas outlet of the heat exchange and condensation assembly respectively, for conveying the hot gas generated after heat exchange in the heat exchange and condensation assembly; and a water collecting tank communicated with the liquid outlet, for collecting the liquid after condensation or dehydration.

2. The spray tower flue gas heat exchange condensing system according to claim 1, characterized in that: The application further comprises a tail gas purification device for pretreating the tail gas of the spray drying tower, the tail gas purification device having a gas inlet end and a gas outlet end, the gas inlet end being connected with the tail gas outlet through a pipeline, and the gas outlet end being connected with the flue gas inlet through a pipeline.

3. The flue gas heat exchange condensing system of the spray tower according to claim 1, characterized in that: The application further comprises a demisting device communicated with the exhaust outlet, for further reducing the water content of the exhaust gas.

4. The spray tower flue gas heat exchange condensing system according to claim 3, characterized in that: The demisting device comprises a hollow tower body, a demisting device and an exhaust cylinder, the hollow tower body being connected with the heat exchange and condensation assembly and arranged above the water collecting tank, the demisting device being arranged in the hollow tower body, the hollow tower body being provided with an air outlet, and the exhaust cylinder being connected with the upper end of the hollow tower body.

5. The spray tower flue gas heat exchange condensing system according to claim 4, characterized in that: The demisting device comprises multiple layers, and the multiple layers of the demisting device are arranged in the hollow tower body from bottom to top.

6. The flue gas heat exchange condensing system of the spray tower according to claim 4, characterized in that: The demisting device further comprises a spraying device, the spraying device comprising multiple spray heads and a spraying pipeline, the multiple spray heads being arranged in the hollow tower body, and the spraying pipeline being connected with the multiple spray heads.

7. The spray tower flue gas heat exchange condensing system according to claim 6, characterized in that: The application further comprises a condensate water recycling system, the condensate water recycling system comprising a condensate water collecting pool, a recycling pool and a liquid pumping pump, the condensate water collecting pool being connected with the recycling pool through a purification device, the condensate water collecting pool being connected with the water collecting tank through a pipeline, and the recycling pool being connected with the spraying pipeline through the liquid pumping pump.

8. The spray tower flue gas heat exchange condensing system of claim 1, wherein: The condensation device comprises a refrigerant circulating device, a cooler and a condensate water guiding part, the refrigerant circulating device being connected with the cooler, and the condensate water guiding part being arranged at the bottom of the cooler and communicated with the liquid outlet, for guiding the condensate liquid to flow out along the liquid outlet.

9. The spray tower flue gas heat exchange condensing system of claim 1, wherein: The hot gas recycling assembly comprises a fan, a hot gas pipeline and a hot gas interface, the air inlet of the fan being connected with the hot gas outlet, the air outlet of the fan being connected with the gas inlet through the hot gas pipeline, and the hot gas interface being connected with the hot gas pipeline, for being connected with other production components to provide hot gas.

10. The spray tower flue gas heat exchange condensing system of claim 1, wherein: The heat exchange device is a tubular heat exchanger or a plate heat exchanger.

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