Exhaust steam heat recovery device for steam turbine of thermal power plant
By introducing a serpentine heat exchange tube and a preheating box structure into the turbine exhaust heat recovery device, the problem of incomplete heat recovery in the existing device is solved, the full utilization of heat from liquid water and gas is achieved, and the heat recovery efficiency is improved.
Patent Information
- Application Number
- CN202520509078.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-03-21
AI Technical Summary
Existing turbine exhaust heat recovery devices can only recover a portion of the heat, resulting in a significant waste of heat.
A heat recovery device for exhaust steam from a thermal power plant turbine was designed. It utilizes a serpentine heat exchange tube and a preheating box structure to preheat tap water using the heat from the liquid water and gas formed by steam, thereby improving the heat recovery efficiency.
This improves the utilization rate of exhaust heat from the steam turbine, achieves full recovery of heat from liquid water and gas, and reduces heat waste.
Smart Images
Figure CN223689789U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat recovery device technical field, concretely is a steam turbine exhaust heat recovery device of thermal power plant. BACKGROUND
[0002] Steam turbine plays a vital role in thermal power plant, and is one of the indispensable equipment for power production. It uses the high-temperature and high-pressure steam generated by the boiler to drive the turbine rotor to rotate, thereby driving the generator connected thereto to generate electricity.
[0003] The steam discharged by the steam turbine is usually in a high-temperature and high-pressure state, so it has a large amount of latent heat and kinetic energy. In order to make full use of these energies, thermal power plants usually take some measures to recover and utilize this part of steam.
[0004] In the existing steam turbine exhaust heat recovery process, the water vapor is usually directly discharged after being formed into liquid water droplets through heat exchange. The temperature of these liquid water droplets is generally around 45℃, and the gas discharged at this time also has a relatively high temperature. This results in only part of the heat being recovered and utilized, and the remaining large amount of heat being difficult to recover, causing heat waste. SUMMARY
[0005] The technical problem to be solved by the utility model is that the existing steam turbine exhaust heat recovery device can only recover and utilize part of the heat, and a large amount of heat is difficult to recover, causing heat waste.
[0006] In order to solve the above problems, the technical scheme of the utility model is as follows: a steam turbine exhaust heat recovery device of thermal power plant, comprising a heat exchange box, a plurality of heat exchange pipes are installed inside the heat exchange box, a water inlet pipe is arranged at the lower part of the rear end, a water outlet pipe is arranged at the upper part of the front end, the input ends of the plurality of heat exchange pipes are connected to an input pipe, and the output ends are connected to an output pipe;
[0007] A preheating box is arranged at the lower part of the right side of the heat exchange box, a water supply pipe is arranged at the lower part of the side of the preheating box, the water inlet pipe is connected to the water supply pipe through a communication pipe at one side of the top, an inner cylinder is installed at the inner top, a drain pipe is arranged at the bottom of the inner cylinder, a plurality of heat conduction fins are fixedly connected to the outer side of the inner cylinder, a plurality of air guide pipes are connected to the upper part of the side of the inner cylinder, an annular pipe is arranged at the middle part of the outer side of the preheating box, an exhaust pipe is installed on the annular pipe, one end of the air guide pipe away from the inner cylinder is connected to the annular pipe, and the end of the output pipe extends to the inner side of the inner cylinder.
[0008] Further, the heat exchange pipe is a serpentine pipe, the input end of which penetrates the upper part of the left side of the heat exchange box, and the output end penetrates the lower part of the right side of the heat exchange box.
[0009] Further, the water supply pipe is tangent to the preheating box.
[0010] Further, the drain pipe penetrates the bottom surface of the preheating box, and valves are installed on the drain pipe and the water outlet pipe.
[0011] Further, the heat conducting sheets are arranged in an annular array outside the inner cylinder, and each of the air guiding pipes is located at the middle position between two adjacent heat conducting sheets.
[0012] Further, the inner cylinder is internally provided with a mist catching net sleeved outside the output pipe, and the mist catching net is in a tapered structure with a small upper end and a large lower end.
[0013] Compared with the prior art, the utility model has the advantages that: after the liquid water formed by the steam discharged from the steam turbine, the heat in the liquid water and the heat carried by the gas can be used to preheat the tap water in the preheating box, the tap water is preheated and then enters the heat exchange box, the heating efficiency of the water in the heat exchange box is improved, and the steam turbine exhaust heat recovery utilization rate is improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is the three-dimensional view of the utility model Figure 1 .
[0015] Figure 2 is the three-dimensional view of the utility model Figure 2 .
[0016] Figure 3 is the sectional view of the heat exchange box of the utility model.
[0017] Figure 4 is the sectional view of the preheating box of the utility model.
[0018] As shown in the drawings: 1, heat exchange box; 2, heat exchange pipe; 3, water inlet pipe; 4, water outlet pipe; 5, input pipe; 6, output pipe; 7, preheating box; 8, feedwater pipe; 9, communication pipe; 10, inner cylinder; 11, drain pipe; 12, heat conducting sheet; 13, air guiding pipe; 14, annular pipe; 15, exhaust pipe; 16, mist catching net. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0020] As Figures 1 to 3As shown in the figure, a steam turbine exhaust heat recovery device of a thermal power plant comprises a heat exchange box 1, a plurality of heat exchange pipes 2 are installed inside the heat exchange box 1, a water inlet pipe 3 is arranged at the lower rear end of the heat exchange box 1, a water outlet pipe 4 is arranged at the upper front end of the heat exchange box 1, the input ends of the plurality of heat exchange pipes 2 are connected to an input pipe 5, and the output ends of the plurality of heat exchange pipes 2 are connected to an output pipe 6, the heat exchange pipes 2 are serpentine pipes, the input ends of the heat exchange pipes 2 penetrate the upper left side of the heat exchange box 1, and the output ends of the heat exchange pipes 2 penetrate the lower right side of the heat exchange box 1.
[0021] The input pipe 5 is connected to a steam turbine exhaust pipe, water vapor is formed into liquid water after heat exchange, and tap water in the heat exchange box 1 is heated to form hot water.
[0022] As shown in the figure, Figure 1 , Figure 2 and Figure 4 As shown in the figure, a preheating box 7 is arranged at the lower right side of the heat exchange box 1, a feedwater pipe 8 is arranged at the lower side of the preheating box 7, the preheating box 7 is connected to the water inlet pipe 3 through a communication pipe 9 at one side of the top, an inner cylinder 10 is installed at the inner top of the preheating box 7, the feedwater pipe 8 is tangent to the preheating box 7, a drain pipe 11 is arranged at the bottom of the inner cylinder 10, a plurality of heat conduction fins 12 are fixedly connected to the outer side of the inner cylinder 10, the drain pipe 11 penetrates the bottom surface of the preheating box 7, a valve is arranged on the drain pipe 11, and the heat conduction fins 12 are arranged in an annular array on the outer side of the inner cylinder 10.
[0023] A plurality of air guide pipes 13 are connected to the upper side of the inner cylinder 10, each air guide pipe 13 is located at the middle position between two adjacent heat conduction fins 12, an annular pipe 14 is arranged at the middle of the outer side of the preheating box 7, an exhaust pipe 15 is arranged on the annular pipe 14, one end of the air guide pipe 13 away from the inner cylinder 10 is connected to the annular pipe 14, the end of the output pipe 6 extends to the inner side of the inner cylinder 10, and a mist catching net 16 is installed inside the inner cylinder 10 and surrounds the output pipe 6, the mist catching net 16 has a tapered structure that is small at the top and large at the bottom.
[0024] The feedwater pipe 8 is connected to a tap water supply pipeline, the liquid water formed by water vapor is hot water at about 40-50℃, the water is transported into the inner cylinder 10 through the output pipe 6, and the heat in the water preheats the tap water in the preheating box 7 through the inner cylinder 10 and the heat conduction fins 12. Water and gas can be separated by the inner cylinder 10, the gas enters the annular pipe 14 through the air guide pipe 13, and then is discharged through the exhaust pipe 15. The heat carried by the gas can heat the water in the preheating box 7 again when passing through the air guide pipe 13. The water carried by the gas can be captured by the mist catching net 16, and the water content in the discharged gas is reduced.
[0025] In specific use, the water supply pipe 8 is connected to a tap water supply pipeline, the tap water fills the preheating tank 7, and then enters the heat exchange tank 1 through the communicating pipe 9 via the water inlet pipe 3; the steam discharged by the steam turbine enters the heat exchange pipe 2 via the input pipe 5 to exchange heat with the water in the heat exchange tank 1; since the input end of the heat exchange pipe 2 is located at the upper end of the heat exchange tank 1, the water temperature at the upper part of the heat exchange tank 1 is higher than that at the lower part; the liquid water formed by the steam is output to the inner cylinder 10 via the output pipe 6; the heat in the water preheats the tap water in the preheating tank 7 via the inner cylinder 10 and the heat conducting sheet 12; the arrangement of the inner cylinder 10 can realize water-gas separation; the heat carried by the gas can heat the water in the preheating tank 7 again when passing through the air guide pipe 13; and thus the tap water is preheated before entering the heat exchange tank 1, the heating efficiency of the water in the heat exchange tank 1 is improved, and the steam turbine exhaust heat recovery rate is improved.
[0026] The non-disclosed parts in the utility model are all prior art, and the specific structure and working principle will not be described again.
[0027] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0028] Although embodiments of the utility model have been shown and described, it is to be understood that the embodiments are merely exemplary and that certain steps can be substituted or deleted, others can be added, and certain characteristics can be substituted for other characteristics, without departing from the spirit and scope of the utility model. The scope of the utility model is defined by the claims and their equivalents.
[0029] The utility model and its implementation mode have been described above, and this description is not restrictive, and the embodiment shown in the drawings is only one of the embodiments of the utility model, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired, without departing from the creative purpose of the utility model, without creative design, similar structure and embodiments of the technical scheme can be designed, which should belong to the protection scope of the utility model.
Claims
1. A steam turbine exhaust heat recovery device for thermal power plant, comprising a heat exchange box (1), a plurality of heat exchange pipes (2) are installed inside the heat exchange box (1), a water inlet pipe (3) is arranged at the lower rear end of the heat exchange box (1), a water outlet pipe (4) is arranged at the upper front end of the heat exchange box (1), input ends of the plurality of heat exchange pipes (2) are connected to an input pipe (5) in common, output ends of the plurality of heat exchange pipes (2) are connected to an output pipe (6) in common, characterized in that: a preheating box (7) is arranged at the lower right side of the heat exchange box (1), a water supply pipe (8) is arranged at the lower side of the preheating box (7), the water supply pipe (8) is connected to the water inlet pipe (3) through a communication pipe (9) at one side of the top of the preheating box (7), an inner cylinder (10) is installed at the inner top of the preheating box (7), a drain pipe (11) is arranged at the bottom of the inner cylinder (10), a plurality of heat conduction fins (12) are fixedly connected to the outer side of the inner cylinder (10), a plurality of air guide pipes (13) are connected to the upper side of the inner cylinder (10), an annular pipe (14) is arranged at the middle of the outer side of the preheating box (7), an exhaust pipe (15) is arranged on the annular pipe (14), one end of the air guide pipe (13) away from the inner cylinder (10) is connected to the annular pipe (14), and the end of the output pipe (6) extends to the inner side of the inner cylinder (10).
2. A steam turbine exhaust heat recovery device for a thermal power plant according to claim 1, characterized in that: The heat exchange pipe (2) is a serpentine pipe, the input end of the heat exchange pipe (2) penetrates through the upper left side of the heat exchange box (1), and the output end of the heat exchange pipe (2) penetrates through the lower right side of the heat exchange box (1).
3. A steam turbine exhaust heat recovery device for a thermal power plant according to claim 1, characterized in that: The water supply pipe (8) is tangent to the preheating box (7).
4. A steam turbine exhaust heat recovery device for a thermal power plant according to claim 1, characterized in that: The drain pipe (11) penetrates through the bottom surface of the preheating box (7), and a valve is arranged on each of the drain pipe (11) and the water outlet pipe (4).
5. A steam turbine exhaust heat recovery device for a thermal power plant according to claim 1, characterized in that: The heat conduction fins (12) are arranged in an annular array on the outer side of the inner cylinder (10), and each of the air guide pipes (13) is located at the middle position between two adjacent heat conduction fins (12).
6. A steam turbine exhaust heat recovery device for a thermal power plant according to claim 1, characterized in that: A mist catching net (16) is arranged inside the inner cylinder (10) and sleeved on the outer side of the output pipe (6), and the mist catching net (16) has a tapered structure with a small upper end and a large lower end.