Desulfurized flue gas waste heat recycling system
By designing a waste heat recovery and utilization system for desulfurized flue gas, the problems of high energy consumption, equipment corrosion, and white smoke emission in the treatment of desulfurized flue gas have been solved, realizing the full utilization of waste heat and environmental protection.
Patent Information
- Application Number
- CN202511208349.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2025-11-28
AI Technical Summary
Existing technologies for treating flue gas after desulfurization suffer from problems such as high energy consumption, severe equipment corrosion, low treatment efficiency, and short equipment lifespan, resulting in white smoke emissions that have an adverse impact on the environment.
Design a desulfurization flue gas waste heat recovery and utilization system, including a desulfurization tower, a spray heat exchanger, a water tank, a circulating pump, and a heating system. The system uses the spray heat exchanger to exchange heat between flue gas and liquid, utilizes the waste heat to heat the heating system, and collects condensate for heating. It also reduces water vapor content to eliminate white smoke and uses specific nozzles and porous glass bulbs to improve heat exchange efficiency and equipment lifespan.
It has enabled the full utilization of waste heat from flue gas after desulfurization, eliminated white smoke, reduced pollutant emission concentrations, extended equipment lifespan, and achieved rational resource utilization and environmental protection.
Smart Images
Figure CN121025823A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of desulfurized flue gas waste heat utilization, in particular to a desulfurized flue gas waste heat recycling system. BACKGROUND
[0002] At present, the flue gas of domestic chemical industry and coking industry usually needs to be treated by wet desulfurization before being discharged, which reduces the salt content in the discharged flue gas while reducing the temperature; after wet desulfurization, the discharged flue gas is mainly high-humidity low-temperature flue gas, which is saturated wet flue gas with a temperature of about 60 DEG C, containing a large amount of water, a small amount of sulfur dioxide, nitrogen oxides and dust and other pollutants; when the flue gas is directly discharged into the chimney, a temperature difference is generated with the outside temperature, and then a wet plume, i.e. white smoke, is generated at the top of the chimney; the discharge of such white smoke has a very adverse effect on the surrounding environment.
[0003] At present, there are many methods for flue gas white smoke elimination, such as heating, air condensation, activated carbon adsorption, dust removal and other treatment methods; although these treatment methods have certain effects, there are still some problems, such as the method of reducing the water content in the flue gas by heating, which can reduce the plume, but needs to consume additional energy; the dust removal treatment method can effectively remove the dust in the flue gas, but the equipment operation cost is high; the activated carbon adsorption needs to be treated regularly; the air condensation does not need additional investment, but its treatment efficiency is low, the effect is poor, and the acidic liquid produced by the combination of the condensate water produced during air condensation and the sulfur dioxide and sulfur trioxide in the flue gas adheres to the surface of the equipment, causing serious corrosion of the equipment and affecting the service life of the equipment.
[0004] It can be seen that reasonable treatment of the desulfurized flue gas is of great significance to the industry. SUMMARY
[0005] In view of this, the present application provides a desulfurized flue gas waste heat recycling system, in particular to a desulfurized flue gas waste heat utilization system provided with a desulfurization tower, a spray heat exchanger, a water tank, a circulating pump, a heating system and a chimney. The desulfurized flue gas waste heat utilization system has the advantages of reasonable design, strong practicality and convenient use. The use of the desulfurized flue gas waste heat utilization system can achieve the purpose of fully utilizing the waste heat of the desulfurized flue gas and eliminating white smoke.
[0006] The technical scheme of the present application is as follows: A desulfurized flue gas waste heat recycling system, comprising a desulfurization tower, a spray heat exchanger, a water tank, a circulating pump, a heating system and a chimney. The gas outlet of the desulfurization tower is connected with the flue gas inlet of the spray heat exchanger; the flue gas outlet of the spray heat exchanger is connected with the chimney; the liquid outlet of the spray heat exchanger is connected with the water tank, the water tank is connected with the heat circulation pump, the heat circulation pump is connected with the hot water inlet of the heating system, and the cold water outlet of the heating system is connected with the spraying system of the spray heat exchanger. The temperature of the flue gas discharged from the desulfurization tower is about 60℃, and if the heat is not treated, it will be wasted, and the direct discharge of the flue gas into the chimney will produce smoke plume and affect the environment. Therefore, by arranging the spray heat exchanger, on the one hand, the sprayed liquid can exchange heat with the flue gas discharged from the desulfurization tower, and the heat-exchanged liquid can be sent to the heating system to heat the heating system, so as to fully utilize the waste heat of the flue gas after desulfurization; on the other hand, the water vapor in the flue gas discharged from the desulfurization tower can be condensed, and the condensed water can be collected for heating the workshop in the heating system. The arrangement not only fully utilizes the waste heat of the flue gas, but also effectively achieves the purpose of eliminating white smoke by reducing the water content of the water vapor, realizes the rational utilization of resources, and avoids pollution and harm to the environment.
[0007] Preferably, the spray heat exchanger comprises a tank body and a spraying system. The spraying system comprises a spraying pipe, and a spray head A and a spray head B are screwed on the spraying pipe. The spray head A is umbrella-shaped, and the liquid spraying direction is vertical, that is, the spray head A sprays liquid downward. The spray head B is close to the inner side of the tank body, and the spray head B is tapered, the liquid spraying direction is inclined and towards the tank body; the spray angle between the spray head B and the vertical plane is 20-40°; the arrangement makes the liquid sprayed by the spray head B fall on the inner side of the tank body, part of the liquid falling on the inner side of the tank body flows downward along the tank body to avoid the acid liquid from adhering to the inner side of the tank body to corrode the tank body, and part of the liquid reflects to the inside of the tank body to disturb the movement track of the flue gas after desulfurization entering the inside of the tank body, prolongs the contact time of the flue gas and the sprayed liquid, and improves the heat exchange efficiency of the waste heat.
[0008] Preferably, the spraying pipe comprises an input pipe and annular pipes A, B, C, D and E connected with the input pipe, the annular pipes A, B, C, D and E are coaxially arranged and located on the same plane; the spray head A is uniformly distributed on the annular pipes A, B, C and D, and the spray head B is uniformly distributed on the annular pipe E; the spray head A covers the inside of the tank body, improves the contact area of the sprayed liquid and the flue gas after desulfurization, and further improves the heat exchange effect of the flue gas waste heat; the liquid sprayed by the spray head B covers the inner side of the tank body, avoids the formed acid liquid from adhering to the inner side of the tank body to cause corrosion, and prolongs the service life of the equipment.
[0009] Preferably, the inside of the tank body is provided with a screen, which is located in the middle and lower part of the tank body; the flue gas inlet of the spray heat exchanger is located below the screen; the flue gas after desulfurization enters the inside of the tank body from the flue gas inlet of the spray heat exchanger, moves upward after passing through the screen; and the screen can intercept part of dust and other impurities.
[0010] Preferably, the screen and the spray pipe are filled with porous glass bubbles, which can prolong the contact time of flue gas and liquid, thereby improving the heat exchange effect of waste heat, and achieving the purpose of fully utilizing the waste heat of flue gas; the setting of nozzle B can also promote the movement of the porous glass bubbles, further disturbing the travel of flue gas.
[0011] Preferably, a pneumatic rapping device is arranged outside the tank body, which can enhance the collision between the porous glass bubbles, make the dust on the surface and in the pores of the porous glass bubbles fall off as much as possible, ensure the travel of flue gas, and further ensure the heat exchange efficiency and effect.
[0012] Compared with the prior art, the present application has the following advantages: In the present application, by arranging the spray heat exchanger, the waste heat of flue gas after desulfurization can be deeply utilized, and dust, sulfides, nitrogen oxides and the like in the flue gas after desulfurization can be further treated, thereby avoiding the generation of smoke plume; by arranging the spray system and setting nozzle B, the corrosion of acidic substances generated by the combination of sulfides and water on the inner wall of the tank body can be avoided, and the service life of the equipment can be prolonged; by arranging the porous glass bubbles, the travel of flue gas can be prolonged, and dust and the like can be effectively intercepted, thereby further improving the quality of gas discharged from the chimney. The desulfurized flue gas waste heat utilization system has the advantages of reasonable design, strong practicability and convenient use. The use of the desulfurized flue gas waste heat utilization system can achieve the purposes of fully utilizing the waste heat of flue gas after desulfurization and eliminating white smoke. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.
[0014] Fig. 1 Figure 1 is a structural schematic view of the waste heat recovery and utilization system.
[0015] Fig. 2 Figure 2 is a structural schematic view of the spray heat exchanger.
[0016] Fig. 3 Figure 3 is a structural schematic view of the spray system.
[0017] In the figure, 1-desulfurization tower, 2-spray heat exchanger, 201-tank body, 202-spraying system, 2021-spraying pipe, 20211-input pipe, 20212-annular pipe A, 20213-annular pipe B, 20214-annular pipe C, 20215-annular pipe D, 20216-annular pipe E, 2022-spraying head A, 2023-spraying head B, 3-water tank, 4-circulating pump, 5-heating system, 6-chimney, 7-intercepting net, 8-porous glass bubble, 9-pneumatic rapping device. DETAILED DESCRIPTION
[0018] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.
[0019] In combination with Figs. 1-3 The present application provides a desulfurized flue gas waste heat recycling system, comprising a desulfurization tower 1, a spray heat exchanger 2, a water tank 3, a circulating pump 4, a heating system 5 and a chimney 6. The gas outlet of the desulfurization tower 1 is connected with the flue gas inlet of the spray heat exchanger 2; the flue gas outlet of the spray heat exchanger 2 is connected with the chimney 6; the liquid outlet of the spray heat exchanger 2 is connected with the water tank 3, the water tank 3 is connected with the heat circulating pump 4, the heat circulating pump 4 is connected with the hot water inlet of the heating system 5, and the cold water outlet of the heating system 5 is connected with the spraying system 202 of the spray heat exchanger 2. The spray heat exchanger 2 comprises a tank body 201 and a spraying system 202. The spraying system 202 comprises a spraying pipe 2021, on which an umbrella-shaped spraying head A 2022 and a spraying head B 2023 are screwed. The spraying head A 2022 is umbrella-shaped, and the liquid spraying direction thereof is vertical, i.e. the spraying head A 2022 sprays liquid moving downward. The spraying head B 2023 is close to the inner side of the tank body 201, and the spraying head B 2023 is tapered, the liquid spraying direction thereof is inclined and faces the tank body 201; the included angle between the spraying head B 2023 and the vertical plane is 30°; this setting makes the liquid sprayed by the spraying head B 2023 fall on the inner side of the tank body 201, part of the liquid falling on the inner side of the tank body 201 flows downward along the tank body 201, avoiding the acid liquid from adhering to the inner side of the tank body 201 and corroding the tank body 201, and part of the liquid reflects to the inside of the tank body 201 to disturb the movement track of the desulfurized flue gas entering the inside of the tank body 201, prolongs the contact time of the flue gas and the sprayed liquid, and improves the heat exchange efficiency of the waste heat. In this embodiment, the spray pipe 2021 includes an input pipe 20211 and annular pipes A 20212, B 20213, C 20214, D 20215 and E 20216 connected with the input pipe 20211, the annular pipes A 20212, B 20213, C 20214, D 20215 and E 20216 are coaxially arranged and located on the same plane; the annular pipes A 20212, B 20213, C 20214 and D 20215 are uniformly provided with spray heads A 2022, and the annular pipe E 20216 is uniformly provided with spray heads B 2023; the spray heads A 2022 cover the inside of the tank body 201, which improves the contact area of the sprayed liquid and the flue gas after desulfurization, and further improves the heat exchange effect of the flue gas waste heat; the liquid sprayed by the spray heads B 2023 covers the inner side of the tank body 201, which avoids corrosion caused by the adhesion of the formed acidic liquid to the inner side of the tank body 201, and prolongs the service life of the equipment; A interception net 7 is installed in the inside of the tank body 201, and the interception net 7 is located at the middle and lower part of the tank body 201; the flue gas inlet of the spray heat exchanger 2 is located below the interception net 7; the flue gas after desulfurization enters the inside of the tank body 201 from the flue gas inlet of the spray heat exchanger 2, and moves upward after passing through the interception net 7; the interception net 7 can intercept part of the dust and other impurities; The interception net 7 and the spray pipe 2021 are filled with porous glass bubbles 8, which can prolong the contact time of the flue gas and the liquid, and further improve the heat exchange effect of the waste heat, so as to achieve the purpose of fully utilizing the flue gas waste heat; the setting of the spray heads B can also promote the movement of the porous glass bubbles 8, and further disturb the travel of the flue gas; A pneumatic rapping device 9 is arranged outside the tank body 201, which can enhance the collision between the porous glass bubbles 8, and make the dust on the surface and in the holes of the porous glass bubbles 8 fall off as much as possible, so as to ensure the movement of the flue gas, and further ensure the heat exchange efficiency and effect; The temperature of the flue gas discharged from the desulfurization tower 1 is about 60℃, and if this part of heat is not treated, it will be wasted, and the direct discharge of the flue gas into the chimney 6 will produce smoke plume and affect the environment, therefore, through the setting of the spray heat exchanger 2, on the one hand, the sprayed liquid can exchange heat with the flue gas discharged from the desulfurization tower 1, and the heat-exchanged liquid can be sent into the heating system 5 to heat the heating system 5, so as to achieve the purpose of fully utilizing the waste heat of the flue gas after desulfurization, on the other hand, the water vapor in the flue gas discharged from the desulfurization tower 1 can be condensed, and the condensed water can be collected and used in the heating system 5 for heating the workshop; this setting not only can fully utilize the flue gas waste heat, but also can effectively achieve the purpose of eliminating white smoke by reducing the water content of the water vapor, realize the rational utilization of resources, and avoid pollution and harm to the environment.
[0020] The desulfurized flue gas waste heat recycling system can deeply cool the desulfurized flue gas, the flue gas temperature discharged into a chimney is about 20 DEG C, the purpose of recycling the flue gas waste heat is achieved, the water content in the flue gas can be reduced, the phenomenon of white smoke of the flue gas is eliminated, and the pollutant emission concentration is reduced; and the heated heat medium can be used as winter workshop heating water.
[0021] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Without departing from the spirit and essential characteristics of the application, one of ordinary skill can make other variations and modifications of the application after having read this disclosure. Any variations and modifications based on the present application are to be considered as falling within the scope of the application. Any variations and modifications based on the present application are to be considered as falling within the scope of the application. Any variations and modifications based on the present application are to be considered as falling within the scope of the application. Therefore, the scope of the application shall be limited only by the scope of the claims.
Claims
1. A desulfurization flue gas waste heat recovery and utilization system, characterized in that, This includes desulfurization towers, spray heat exchangers, water tanks, circulating pumps, heating systems, and chimneys; The gas outlet of the desulfurization tower is connected to the flue gas inlet of the spray heat exchanger; the flue gas outlet of the spray heat exchanger is connected to the chimney; the liquid outlet of the spray heat exchanger is connected to the water tank, the water tank is connected to the thermal circulation pump, the thermal circulation pump is connected to the hot water inlet of the heating system, and the cold water outlet of the heating system is connected to the spray system of the spray heat exchanger.
2. The desulfurization flue gas waste heat recovery and utilization system as described in claim 1, characterized in that, The spray heat exchanger includes a tank and a spray system; The spraying system includes a spray pipe, and nozzle A and nozzle B are screwed onto the spray pipe; The nozzle A is umbrella-shaped, and its liquid spray direction is vertical; The nozzle B is located near the inner side of the tank. The nozzle B is tapered and its liquid spray direction is inclined and faces the tank. The spray angle between the nozzle B and the vertical plane is 20-40°.
3. The desulfurization flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, The spray pipe includes an input pipe and annular pipes A, B, C, D, and E connected to the input pipe. The annular pipes A, B, C, D, and E are coaxially arranged and located on the same plane. Spray nozzles A are evenly distributed on the annular pipes A, B, C, and D, and spray nozzles B are evenly distributed on the annular pipe E.
4. The desulfurization flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, An interception net is installed inside the tank, located in the lower middle part of the tank; the flue gas inlet of the spray heat exchanger is located below the interception net.
5. The desulfurization flue gas waste heat recovery and utilization system as described in claim 4, characterized in that, The space between the interception net and the spray pipe is filled with porous glass bulbs.
6. The desulfurization flue gas waste heat recovery and utilization system as described in claim 1, characterized in that, A pneumatic percussion device is installed on the outside of the tank.