Exhaust gas recovery device of rotating film type thermal deaerator

Abstract

The utility model discloses an exhaust recovery device of a rotating film type thermal deaerator, which relates to the technical field of exhaust recovery and comprises a heat recovery cylinder, an air inlet pipe and an air outlet pipe are respectively mounted at the upper end and the lower end of the heat recovery cylinder, and a water flow pipe penetrating to the bottom of the heat recovery cylinder is arranged at the top of the heat recovery cylinder. The inner side of the water flow pipe is fixedly connected with a spiral heat conduction plate extending to the outer side of the water flow pipe, the outer side edge of the spiral heat conduction plate is tightly attached to the inner wall of the heat recovery barrel, and the spiral heat conduction plate is located between the air inlet pipe and the air outlet pipe. Through the arrangement of the heat recovery cylinder, the water flow pipe and the spiral heat conduction plate, hot air flow heat discharged by the rotating film type thermal deaerator can be used for preheating water flow, energy needed by the preheated water flow entering the rotating film type thermal deaerator to be heated to the saturation temperature is reduced, and therefore the effect of saving energy is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas recovery, in particular to an exhaust gas recovery device of a rotary film type thermal deaerator. Background Art

[0002] Deaerator is one of the key equipments for producing supporting boilers and heating systems. Gas cyclone deaerator (also called membrane deaerator) is a new type of thermal deaerator. It uses steam extraction from steam turbine to heat boiler feed water to the saturation temperature corresponding to the working pressure of the deaerator, remove oxygen and other gases dissolved in the feed water, and prevent and reduce the corrosion of boiler feed water pipes, economizers and other auxiliary equipment.

[0003] During the deoxidation process of the rotary film thermal deaerator, condensed water and make-up water first enter the water chamber of the rotary film group in the deoxidation head of the deaerator, and are obliquely sprayed from the small holes of the membrane tube to the inner hole under a certain water level differential pressure to form a jet. Since the inner hole is filled with rising heating steam, the water absorbs a large amount of heating steam in the jet movement, which produces a violent mixing and heating effect in a very short time, greatly increasing the water temperature, and the rotating water continues to rotate downward along the inner hole wall of the membrane tube to form a rolling water film skirt. At this time, the turbulent water has the most ideal heat and mass transfer effect. The water temperature reaches the saturation temperature, and the oxygen is separated. Since the oxygen cannot diffuse freely in the inner hole, the oxygen is discharged from the exhaust pipe to the atmosphere along with the rising steam.

[0004] In this process, the discharge of oxygen and part of the steam will take away part of the heat, and this part of the heat is not fully recovered, resulting in energy waste. Based on this, an exhaust gas recovery device of a rotary film thermal deaerator is provided. Utility Model Content

[0005] The purpose of the utility model is to provide an exhaust gas recovery device of a rotary film type thermal deaerator in order to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an exhaust gas recovery device of a rotary film type thermal deaerator, comprising a heat recovery cylinder, an air inlet pipe and an air outlet pipe are respectively installed at the upper and lower ends of the heat recovery cylinder, a water flow pipe penetrating to the bottom of the heat recovery cylinder is arranged at the top of the heat recovery cylinder, a spiral heat conduction plate extending to the outside of the water flow pipe is fixedly connected to the inner side of the water flow pipe, the outer edge of the spiral heat conduction plate is tightly fitted with the inner wall of the heat recovery cylinder, and the spiral heat conduction plate is located between the air inlet pipe and the air outlet pipe;

[0007] The portion of the spiral heat conduction plate located inside the water circulation pipe is used to guide the water flow in the water circulation pipe so that the water flow flows in a spiral trajectory. The portion of the spiral heat conduction plate located between the inner side of the heat recovery cylinder and the outer side of the water circulation pipe is used to guide the hot air flow flowing in the heat recovery cylinder so that the hot air flow flows in a spiral trajectory, thereby increasing the heat exchange stroke between the water flow and the hot air flow.

[0008] As a further solution of the utility model: a conical collecting chamber is formed at the bottom of the inner wall of the heat recovery cylinder, and a drain pipe is fixedly connected to the bottom of the heat recovery cylinder. The drain pipe is distributed on one side of the water flow pipe and penetrates into the interior of the heat recovery cylinder and is connected to the bottom of the conical collecting chamber.

[0009] As a further solution of the utility model: an observation window is installed on one side of the outside of the heat recovery cylinder near the bottom, and the observation window is used to penetrate the water level inside the conical collection chamber.

[0010] As a further solution of the utility model: the spiral heat conduction plate is welded and fixed in sequence by multiple spiral blades, and at the same time, the heat of the hot air flow can be conducted to the middle of the water flow pipe through the spiral heat conduction plate, so as to increase the heat exchange area between the hot air flow and the water flow.

[0011] As a further solution of the utility model: the water flow pipe is composed of multiple connecting pipes, and the multiple connecting pipes and the multiple spiral blades constituting the spiral heat conducting plate are sequentially spliced ​​and welded and fixed;

[0012] The heat recovery tube is composed of two semicircular tubes spliced ​​and sleeved on the outside of the water flow tube and fixed by welding.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By setting up a heat recovery cylinder, a water flow pipe, and a spiral heat conduction plate, the heat of the hot air flow discharged by the rotary film thermal deaerator can be used to preheat the water flow. After the preheated water flow enters the rotary film thermal deaerator, the energy required to be heated to the saturation temperature is reduced, thus achieving the effect of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 This is a structural cross-sectional view of the heat recovery drum of the utility model;

[0017] Figure 3 It is a structural cross-sectional view of the heat recovery cylinder and the water flow pipe of the utility model.

[0018] In the figure: 1. heat recovery cylinder; 2. water flow pipe; 3. air inlet pipe; 4. air outlet pipe; 5. drain pipe; 6. conical collection chamber; 7. spiral heat conduction plate; 8. observation window. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1 to 3 In the embodiment of the utility model, the exhaust gas recovery device of the rotary film type thermal deaerator includes a heat recovery cylinder 1, an air inlet pipe 3 and an air outlet pipe 4 are respectively installed at the upper and lower ends of the heat recovery cylinder 1, a water flow pipe 2 is arranged on the top of the heat recovery cylinder 1 and runs through the bottom of the heat recovery cylinder 1, a spiral heat conduction plate 7 extending to the outside of the water flow pipe 2 is fixedly connected to the inner side of the water flow pipe 2, the outer edge of the spiral heat conduction plate 7 is tightly fitted with the inner wall of the heat recovery cylinder 1, and the spiral heat conduction plate 7 is located between the air inlet pipe 3 and the air outlet pipe 4;

[0021] The portion of the spiral heat conducting plate 7 located inside the water circulation pipe 2 is used to guide the water flowing in the water circulation pipe 2 so that the water flows in a spiral trajectory. The portion of the spiral heat conducting plate 7 located between the inner side of the heat recovery cylinder 1 and the outer side of the water circulation pipe 2 is used to guide the hot air flow flowing in the heat recovery cylinder 1 so that the hot air flow flows in a spiral trajectory, so as to increase the heat exchange stroke between the water flow and the hot air flow.

[0022] The spiral heat conducting plate 7 is fixed by welding a plurality of spiral blades in sequence. At the same time, the heat of the hot air flow can be conducted to the middle of the water flow pipe 2 through the spiral heat conducting plate 7, so as to increase the heat exchange area between the hot air flow and the water flow.

[0023] In this embodiment: it should be supplemented that: when the exhaust gas recovery device is in use, the air inlet pipe 3 is connected to the exhaust port of the rotary film type thermal deaerator, the top end of the water flow pipe 2 is connected to the external water tank, the bottom end of the water flow pipe 2 is connected to the water inlet of the rotary film type thermal deaerator through a tee pipe, and the other end of the tee pipe is connected to the external water tank through a pipeline;

[0024] At the initial stage of the operation of the rotary film thermal deaerator, its external water tank directly supplies water to the rotary film thermal deaerator. When the water temperature inside the rotary film thermal deaerator reaches the saturation temperature, the hot air flow composed of oxygen and part of the water vapor is transported to the inside of the heat recovery cylinder 1 through the exhaust port and the air inlet pipe 3. At this time, the hot air flow will flow upward along the gap between the heat recovery cylinder 1 and the water flow pipe 2. At the same time, the channel directly connected between the external water tank and the rotary film thermal deaerator is closed, and the channel between the external water tank and the water flow pipe 2 is opened. The water flow will flow into the rotary film thermal deaerator through the water flow pipe 2, and the hot air flow inside the heat recovery cylinder 1 will exchange heat with the water flow inside the water flow pipe 2, so that the water flow inside the water flow pipe 2 is preheated;

[0025] At the same time, the spiral heat conducting plate 7 can guide the internal water flow of the water circulation pipe 2 and the hot air flow inside the heat recovery cylinder 1, so that the water flow and the hot air flow flow in a spiral trajectory, which can increase the heat exchange distance of the water flow and the hot air flow, and then extend the heat exchange time. In addition, the spiral heat conducting plate 7 can directly introduce the heat of the hot air flow into the middle of the water circulation pipe 2, so that the water flow and the hot air flow can not only exchange heat through the pipe wall of the water circulation pipe 2, but also through the spiral heat conducting plate 7. Not only is the heat exchange efficiency faster, but the temperature of the water flow inside and outside the water circulation pipe 2 is more uniform;

[0026] Through the coordination of the above multiple parts, the heat of the hot air flow discharged by the rotary film thermal deaerator can be used to preheat the water flow. After the preheated water flow enters the rotary film thermal deaerator, the energy required to be heated to the saturation temperature is reduced, thus achieving the effect of energy saving.

[0027] Please refer to Figures 2-3 A conical collecting chamber 6 is formed at the bottom of the inner wall of the heat recovery cylinder 1, and a drain pipe 5 is fixedly connected to the bottom of the heat recovery cylinder 1. The drain pipe 5 is distributed on one side of the water flow pipe 2 and penetrates into the interior of the heat recovery cylinder 1 and is connected to the bottom of the conical collecting chamber 6;

[0028] An observation window 8 is installed at a position near the bottom of one side of the outside of the heat recovery cylinder 1 , and the observation window 8 is used to observe the water level inside the conical collection chamber 6 .

[0029] In this embodiment: when the hot air flow exchanges heat with the water flow inside the water flow pipe 2, the water vapor in the hot air flow will condense and eventually flow down along the spiral heat conducting plate 7 to the bottom of the heat recovery cylinder 1. The water level of the condensed water inside the heat recovery cylinder 1 can be quickly determined through the observation window 8, so that the drainage operation can be carried out in time by opening the drainage pipe 5;

[0030] The structure of the conical collecting chamber 6 is to facilitate the full discharge of condensed water.

[0031] Please refer to Figures 1 to 3The water flow pipe 2 is composed of a plurality of connecting pipes, and the plurality of connecting pipes and the plurality of spiral blades constituting the spiral heat conducting plate 7 are sequentially spliced ​​and welded;

[0032] The heat recovery tube 1 is composed of two semicircular tubes spliced ​​and sleeved on the outside of the water flow tube 2 and fixed by welding.

[0033] In this embodiment: the assembly production of the device can be realized through this structure, the overall production process is simple, and it is convenient for large-scale production and processing.

[0034] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An exhaust gas recovery device of a rotary film type thermal deaerator, comprising a heat recovery drum (1), characterized in that: An air inlet pipe (3) and an air outlet pipe (4) are respectively installed at the upper and lower ends of the heat recovery cylinder (1); a water flow pipe (2) is arranged at the top of the heat recovery cylinder (1) and penetrates to the bottom of the heat recovery cylinder (1); a spiral heat conduction plate (7) extending to the outside of the water flow pipe (2) is fixedly connected to the inside of the water flow pipe (2); the outer edge of the spiral heat conduction plate (7) is tightly fitted with the inner wall of the heat recovery cylinder (1), and the spiral heat conduction plate (7) is located between the air inlet pipe (3) and the air outlet pipe (4); The portion of the spiral heat conduction plate (7) located inside the water circulation pipe (2) is used to guide the water flow flowing in the water circulation pipe (2) so that the water flow flows in a spiral trajectory, and the portion of the spiral heat conduction plate (7) located between the inner side of the heat recovery cylinder (1) and the outer side of the water circulation pipe (2) is used to guide the hot air flow flowing in the heat recovery cylinder (1) so that the hot air flow flows in a spiral trajectory, thereby increasing the heat exchange stroke between the water flow and the hot air flow.

2. The exhaust gas recovery device of the rotary film thermal deaerator according to claim 1 is characterized in that: A conical collecting chamber (6) is formed at the bottom of the inner wall of the heat recovery cylinder (1), and a drain pipe (5) is fixedly connected to the bottom of the heat recovery cylinder (1). The drain pipe (5) is distributed on one side of the water circulation pipe (2) and penetrates into the interior of the heat recovery cylinder (1) and is connected to the bottom of the conical collecting chamber (6).

3. The exhaust gas recovery device of the rotary film type thermal deaerator according to claim 1 is characterized in that: An observation window (8) is installed at a position close to the bottom of one side of the outside of the heat recovery cylinder (1), and the observation window (8) is used to penetrate the water level inside the conical collection chamber (6).

4. The exhaust gas recovery device of the rotary film type thermal deaerator according to claim 1, characterized in that: The spiral heat conducting plate (7) is welded and fixed in sequence by a plurality of spiral blades. At the same time, the heat of the hot air flow can be conducted to the middle of the water flow pipe (2) through the spiral heat conducting plate (7), so as to increase the heat exchange area between the hot air flow and the water flow.

5. The exhaust gas recovery device of the rotary film type thermal deaerator according to claim 4, characterized in that: The water flow pipe (2) is composed of a plurality of connecting pipes, and the plurality of connecting pipes and a plurality of spiral blades constituting the spiral heat conducting plate (7) are sequentially spliced ​​and welded to fix; The heat recovery cylinder (1) is composed of two semicircular tubes spliced ​​together and sleeved on the outside of the water circulation pipe (2) and fixed by welding.

Images