Exhaust steam heat recovery device for steam turbine of thermal power plant

Abstract

The utility model discloses a thermal power plant steam turbine exhaust steam heat recovery device, and relates to the related technical field of thermal power plants, the thermal power plant steam turbine exhaust steam heat recovery device comprises a base and a recovery mechanism, the recovery mechanism is arranged at the top end of the base, and through the arrangement of the recovery mechanism, during use, a stirring assembly can be driven through a rotating assembly; uniform distribution and circular flow of materials are achieved, heat exchange efficiency is improved, the materials entering the device can be stirred through the stirring assembly, accumulation and caking of the materials are prevented, the drying effect is improved, heat of steam can be transmitted to the materials through the heat exchange assembly, drying and heat treatment of the materials are achieved, and the quality and value of the materials are improved. The feeding and discharging assembly can control feeding and discharging of materials, continuous conveying of the materials is achieved, the production efficiency is improved, heat of steam can be transmitted to air through the drying assembly, the heated air makes contact with the materials for double drying, reutilization of the steam is achieved, and the utilization rate of heat recovery is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to thermal power plants, in particular to a steam turbine exhaust heat recovery device for thermal power plants. Background Art

[0002] The exhaust heat recovery device of the steam turbine of a thermal power plant is a device specially used to recover the high-temperature and high-pressure steam exhausted by the steam turbine of a thermal power plant. The main function of the exhaust heat recovery device of the steam turbine of a thermal power plant is to convert the heat of the exhaust steam into usable energy to improve the thermal efficiency of the thermal power plant and save energy. It can be adjusted and optimized according to different power generation conditions and exhaust parameters. It can achieve effective pressure reduction, temperature reduction and condensation of the exhaust steam to facilitate the recovery of water and heat. At the same time, the exhaust heat recovery device of the steam turbine of a thermal power plant should also have the characteristics of high efficiency, automation and reliability to meet the requirements of the thermal power industry for heat recovery.

[0003] After searching, the patent number "CN216950512U" mentioned in the text that "the utility model discloses a heat recovery device for exhaust steam of a steam turbine in a thermal power plant, including a base, a recovery box with an opening at the top, a top cover, a conveying assembly and a flip assembly. A support frame is correspondingly installed at the bottom of the outer side of the recovery box, and the support frame is locked and fixed with the base, and the top cover is sealed and assembled on the top of the recovery box. The utility model uses the upper nozzle of the arc-shaped spray cavity to homogenize and spray the hot gas, thereby ensuring the uniformity of the hot gas spray and avoiding the accumulation of the hot gas. With the assistance of the flip assembly, the heat in the hot gas is absorbed to achieve the drying treatment of the wet coal, thereby improving the utilization rate of heat and avoiding the waste of resources. During heat exchange, the flip motor can be started to flip the coal in the heat exchange chamber, ensuring full contact between the hot gas and the coal, avoiding uneven heat exchange, and accurately reusing the hot gas, which is energy-saving and environmentally friendly. When in use, the arc-shaped spray chamber is used to dry the wet coal, ensuring the uniformity of the hot gas spray and avoiding the accumulation of hot gas. During heat exchange, the flip motor can be started to flip the coal in the heat exchange chamber, ensuring full contact between the hot gas and the coal, avoiding uneven heat exchange. However, the device will generate a lot of dust when drying the coal, and direct discharge will cause air pollution, and the heat exchange efficiency is not high.

[0004] To this end, we provide a thermal power plant steam turbine exhaust heat recovery device to solve the above problems. Utility Model Content

[0005] The present application provides a thermal power plant steam turbine exhaust heat recovery device, which solves the problem that a large amount of dust is generated when drying coal, direct discharge will cause air pollution, and the heat exchange efficiency is low.

[0006] The present application provides a thermal power plant steam turbine exhaust heat recovery device, comprising a base and a recovery mechanism, wherein the top of the base is provided with the recovery mechanism;

[0007] The recovery mechanism includes a rotating component arranged at the top of the base, a stirring component is arranged at the top of the rotating component, a heat exchange component is arranged on the outside of the stirring component, inlet and outlet components are arranged at both ends of the stirring component, and the outer pipe of the inlet and outlet component is connected to the drying component.

[0008] Preferably, the rotating assembly comprises a motor arranged at the top of the base, and a transmission tooth is connected to a flat key on one side of the motor.

[0009] Preferably, the stirring assembly comprises a drum arranged above the motor, and stirring teeth are arranged on the inner wall of the drum.

[0010] Preferably, the heat exchange assembly comprises a heat pipe wound around the outer wall of the drum, and a heat insulation shell is provided on the outer side of the heat pipe.

[0011] Preferably, the inlet and outlet assembly includes a feed port arranged on one side of the drum, and a discharge port is arranged on the other side of the drum.

[0012] Preferably, the drying assembly comprises an air heater arranged on the outside of the drum, and a hot air pipe is installed on the other side of the feed port.

[0013] Preferably, a filter assembly is provided on one side of the air heater, and the filter assembly comprises a filter provided on one side of the air heater, and a dehumidification tube is provided on the top end of the filter.

[0014] It can be seen from the above technical scheme that the present application provides a heat recovery device for exhaust steam of a steam turbine in a thermal power plant. When in use, the coal to be dried and preheated is first transported into the drum through the feed port, and then the transmission gear is driven by the motor to drive the drum to rotate, and the coal is fully broken up by the stirring teeth in the drum. The exhaust steam of the steam turbine enters the air heater, a part of which is used to heat the air, and the heated air is passed from the hot air pipe into the feed port to directly dry the coal, and the other part enters the heat pipe to heat the drum. The hot air that dries the coal is drawn into the filter through the dehumidification pipe above the discharge port, and the steam in the heat pipe also enters the filter for filtration and discharge, thereby completing the recovery of the exhaust heat of the steam turbine in the thermal power plant.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. Through the setting of the filter component, the air and steam of the drying material can be filtered and discharged, the emission of pollutants can be reduced, and the environmental protection performance can be improved. The dust and water vapor generated when drying the material can be transported to the filter through the dehumidification pipe to improve the drying effect. The filter can intercept solid particles, droplets and bubbles to improve the filtering efficiency;

[0017] 2. Through the setting of the recovery mechanism, when in use, the rotating component can drive the stirring component to achieve uniform distribution and circulation of materials, improve heat exchange efficiency, stir the materials entering the device through the stirring component to prevent material accumulation and agglomeration, and improve the drying effect. The heat of the steam can be transferred to the material through the heat exchange component to achieve drying and heat treatment of the material, improve the quality and value of the material, control the entry and exit of the material through the entry and exit component, achieve continuous transportation of the material, and improve production efficiency. The heat of the steam can be transferred to the air through the drying component, and the heated air contacts the material for double drying, thereby achieving steam reuse and greatly improving the utilization rate of heat recovery.

[0018] In summary, the present application not only filters the dust generated when drying coal, but also uses a dual heat exchange system to improve the heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation cases. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of the overall appearance structure proposed by the utility model;

[0021] Figure 2 This is a schematic diagram of the overall side view structure proposed by the utility model;

[0022] Figure 3 It is a schematic diagram of the overall cross-sectional structure proposed by the utility model;

[0023] Figure 4 This is a schematic diagram of the overall top view structure of the utility model.

[0024] In the figure: 1. base; 2. recovery mechanism; 21. rotating component; 211. motor; 212. transmission gear; 22. stirring component; 221. roller; 222. stirring tooth; 23. heat exchange component; 231. heat pipe; 232. insulation shell; 24. inlet and outlet component; 241. feed port; 242. discharge port; 25. drying component; 251. air heater; 252. hot air pipe; 3. filtering component; 31. filter; 32. dehumidification pipe. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] See also Figure 1-4 A heat recovery device for exhaust steam from a steam turbine in a thermal power plant comprises a base 1 and a recovery mechanism 2. The base 1 is used to support and fix the entire device to improve stability and safety. Specifically, a recovery mechanism 2 is provided on the top of the base 1. The recovery mechanism 2 is used to recover high-temperature and high-pressure steam exhausted from the steam turbine, and utilize its heat for drying and heat exchange to improve energy utilization efficiency.

[0027] The recovery mechanism 2 includes a rotating component 21 arranged at the top of the base 1, which is used to drive the stirring component 22. The stirring component 22 is arranged at the top of the rotating component 21, which is used to stir the material entering the device so that it is evenly distributed in the drum 221, prevent the material from piling up and agglomerating, and improve the drying effect. A heat exchange component 23 is arranged on the outside of the stirring component 22, which is used to transfer the heat of the steam to the material, realize the drying and heat treatment of the material, and improve the quality and value of the material. Inlet and outlet components 24 are arranged at both ends of the stirring component 22, which are used to control the entry and exit of the material, realize the continuous transportation of the material, and improve the production efficiency. The outer pipe of the inlet and outlet component 24 is connected with a drying component 25, which is used to transfer the heat of the steam to the air. The heated air contacts the material for double drying, thereby realizing the reuse of steam.

[0028] In the utility model, the rotating component 21 includes a motor 211 arranged at the top of the base 1, which is used to provide power to the rotating component 21, and the speed and direction can be adjusted to achieve automatic control. A flat key on one side of the motor 211 is connected with a transmission tooth 212, which is used to connect the motor 211 and the roller 221 to achieve power transmission. Gear transmission is adopted, the structure is compact, and the transmission efficiency is high.

[0029] In the utility model, the stirring component 22 includes a roller 221 arranged above the motor 211, which is used to contain materials. It is made of stainless steel, is resistant to high temperature, corrosion, and easy to clean. The inner wall of the roller 221 is provided with stirring teeth 222 for stirring materials. It adopts a spiral shape, which can form a circulating flow of materials in the roller 221, increase the exposure area of ​​the materials, and improve the heat exchange efficiency.

[0030] In the utility model, the heat exchange component 23 includes a heat pipe 231 wound around the outer wall of the drum 221, which is used to introduce steam. It is made of copper pipe material and has good thermal conductivity. A heat pipe 231 network can be formed inside the drum 221 to evenly distribute heat and improve the heat exchange effect. An insulation shell 232 is provided on the outside of the heat pipe 231 to wrap the heat pipe 231. Insulating materials are used to prevent heat loss, maintain the high temperature state of the heat pipe 231, and improve thermal efficiency.

[0031] In the utility model, the inlet and outlet assembly 24 includes a feed port 241 arranged on one side of the drum 221, which is used to transport the material into the drum 221, so as to realize quantitative feeding of the material and avoid clogging and overflow of the material. The other side of the drum 221 is provided with a discharge port 242, which is used to transport the material out of the drum 221, so as to realize rapid discharge of the material and avoid retention and cooling of the material.

[0032] In the utility model, the drying component 25 includes an air heater 251 arranged on the outside of the drum 221, which is used to heat the air. The electric heating element is used to adjust the temperature and realize automatic control. A hot air pipe 252 is installed on the other side of the feed port 241, which is used to blow hot air into the drum 221 to form a high-temperature dry airflow, accelerate the drying of the material, and improve the drying efficiency.

[0033] In some embodiments, a filter assembly 3 is provided on one side of the air heater 251, and the filter assembly 3 includes a filter 31 provided on one side of the air heater 251. A dehumidification pipe 32 is provided on the top of the filter 31. The filter 31 is used to filter the air and steam of the drying material. A porous filter screen is used to intercept solid particles, droplets and bubbles, and reduce emission pollution. The dehumidification pipe 32 is used to transport the dust and water vapor generated when drying the material to the filter 31.

[0034] It can be seen from the above technical scheme that when in use, the coal to be dried and preheated is first transported into the drum 221 through the feed port 241, and then the transmission gear 212 is driven by the motor 211, thereby driving the drum 221 to rotate, and the coal is fully broken up by the stirring teeth 222 in the drum 221. The exhaust steam of the steam turbine enters the air heater 251, a part of which is used to heat the air, and the heated air is passed from the hot air pipe 252 into the feed port 241 to directly dry the coal, and the other part enters the heat pipe 231 to heat the drum 221. The hot air for drying the coal is drawn into the filter 31 through the dehumidification pipe 32 above the discharge port 242, and the steam in the heat pipe 231 also enters the filter 31 for filtration and discharge, thereby completing the recovery of the exhaust heat of the steam turbine in the thermal power plant.

[0035] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the claims.

[0036] It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. A steam turbine exhaust heat recovery device for a thermal power plant, comprising a base (1) and a recovery mechanism (2), characterized in that: A recovery mechanism (2) is provided at the top of the base (1); The recovery mechanism (2) comprises a rotating assembly (21) arranged at the top of the base (1); a stirring assembly (22) is arranged at the top of the rotating assembly (21); a heat exchange assembly (23) is arranged on the outside of the stirring assembly (22); inlet and outlet assemblies (24) are arranged at both ends of the stirring assembly (22); and a drying assembly (25) is connected to the outer pipe of the inlet and outlet assembly (24).

2. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 1, characterized in that: The rotating assembly (21) comprises a motor (211) arranged at the top of the base (1), and a transmission tooth (212) is connected to one side of the motor (211) by a flat key.

3. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 2, characterized in that: The stirring assembly (22) comprises a roller (221) arranged above the motor (211), and stirring teeth (222) are arranged on the inner wall of the roller (221).

4. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 3, characterized in that: The heat exchange component (23) comprises a heat pipe (231) wound around the outer wall of the drum (221), and a heat insulation shell (232) is arranged on the outer side of the heat pipe (231).

5. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 3, characterized in that: The inlet and outlet assembly (24) comprises a material inlet (241) arranged on one side of the drum (221), and a material outlet (242) is arranged on the other side of the drum (221).

6. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 5, characterized in that: The drying component (25) comprises an air heater (251) arranged outside the drum (221), and a hot air pipe (252) is installed on the other side of the feed port (241).

7. The device for recovering exhaust steam from a steam turbine in a thermal power plant according to claim 6, characterized in that: A filter assembly (3) is provided on one side of the air heater (251), and the filter assembly (3) comprises a filter (31) provided on one side of the air heater (251), and a dehumidification pipe (32) is provided at the top end of the filter (31).

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