Steam-water supply device convenient to use for thermal power generation

Abstract

The invention relates to the technical field of thermal power generation, and particularly discloses a thermal power generation steam-water supply device convenient to use, which comprises a boiler and a waste heat recovery unit, a steam pipeline communicated with a steam turbine is mounted in the boiler, and spiral fins are arranged on the outer wall of the steam pipeline. A filter unit is arranged below the waste heat recovery unit; the waste heat recovery unit comprises a high-temperature flue gas recoverer and a condensate water preheater which are connected through a flange, the high-temperature flue gas recoverer is communicated with the boiler through a pipeline, the heat transfer area is enlarged through spiral fins, heat exchange between flue gas and water is enhanced, and then steam and flue gas paths are separated through the waste heat recovery unit; the spiral fins are combined to enhance heat exchange and waste heat graded recovery, high efficiency and energy conservation are achieved, the three-stage filter unit is matched to guarantee clean water quality, and the device has the advantages of being simple in structure, convenient to operate and low in maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and specifically discloses a steam and water supply device for thermal power generation that is convenient to use. Background Art

[0002] Thermal power generation is a power generation method that uses the heat energy generated by combustibles during combustion and converts it into electrical energy through a power generation power device. China is rich in coal resources. In 1990, the coal output was 1.09 billion tons, of which only 12% was used for power generation. There is still great potential for thermal power generation. During the thermal power generation process, it is necessary to supply steam and water.

[0003] In the traditional steam and water supply device for thermal power generation, the flue gas waste heat is only recovered at a single stage, and a large amount of low-temperature waste heat is not effectively utilized. There is insufficient waste heat recovery, and the heat transfer efficiency of the steam pipeline is low, affecting the overall energy efficiency of the system. Therefore, a steam and water supply device for thermal power generation that is convenient to use is needed to solve this problem. Summary of the Invention

[0004] The present invention proposes a steam and water supply device for thermal power generation that is convenient to use. By separating the steam and flue gas paths through a waste heat recovery unit, combining spiral fins to enhance heat transfer and hierarchical waste heat recovery, high efficiency and energy conservation are achieved. Cooperating with a three-stage filtration unit to ensure clean water quality, it has the advantages of simple structure, convenient operation, and low maintenance cost.

[0005] The present invention is implemented as follows. A steam and water supply device for thermal power generation that is convenient to use includes a boiler and a waste heat recovery unit. A steam pipeline connected to a steam turbine is installed inside the boiler, and spiral fins are provided on the outer wall of the steam pipeline. A filtration unit is provided below the waste heat recovery unit;

[0006] The waste heat recovery unit includes a high-temperature flue gas recovery device and a condensate preheater connected by a flange. The high-temperature flue gas recovery device is connected to the boiler through a pipeline;

[0007] The filtration unit includes a filter tank connected to the outlet of the condensate preheater through a pipeline, a rotating frame rotatably connected inside the filter tank, a coarse filter screen, an activated carbon layer, and a resin softening layer installed inside the rotating frame and distributed in sequence from top to bottom, and a motor installed on the upper end face of the filter tank and whose output end is fixedly connected to the rotating frame.

[0008] Preferably, as a steam and water supply device for thermal power generation that is convenient to use in the present invention, the fin pitch of the spiral fins gradually decreases from top to bottom.

[0009] Preferably, as a steam and water supply device for thermal power generation that is convenient to use in the present invention, a water extraction pipe with a valve installed on the outer wall is connected between the outer wall of the filter tank and the boiler.

[0010] Preferably, as a steam and water supply device for convenient thermal power generation according to the present invention, a support ring platform fixedly connected to the inside of the filter tank and rotatably connected to the rotating frame is provided.

[0011] Preferably, as a steam and water supply device for convenient thermal power generation according to the present invention, a water inlet pipe communicating with the steam pipe is installed on the upper end surface of the boiler.

[0012] Preferably, as a steam and water supply device for convenient thermal power generation according to the present invention, a corrosion-resistant coating is applied to the inner wall of the high-temperature flue gas recovery device.

[0013] The beneficial effects of the present invention are as follows:

[0014] The heat transfer area is enlarged by the spiral fins to strengthen the heat exchange between the flue gas and water. The heat transfer efficiency of the steam pipe is improved by the spiral fins. The waste gas in the boiler enters the high-temperature flue gas recovery device through the pipe. The waste heat of the flue gas after boiler combustion is processed by the high-temperature flue gas recovery device. Then, the condensate preheater further reduces the flue gas temperature by heating the boiler feed water, realizing the hierarchical extraction of heat energy. Then, the water preheated by the condensate preheater passes through the coarse filter screen, activated carbon layer and resin softening layer in sequence to remove impurities and soften the water quality. Furthermore, the steam and flue gas paths are separated by the waste heat recovery unit. Combining the enhanced heat transfer by the spiral fins and the hierarchical recovery of waste heat, high efficiency and energy saving are achieved. Cooperating with the three-stage filtering unit to ensure clean water quality, it has the advantages of simple structure, convenient operation and low maintenance cost. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 It is the overall structure diagram of a steam and water supply device for convenient thermal power generation according to the present invention.

[0017] Figure 2 It is the front view sectional view of a steam and water supply device for convenient thermal power generation according to the present invention.

[0018] Figure 3 It is the structure diagram of the filtering component of the present invention.

[0019] In the figure, the marks are: 1. Boiler; 2. Steam pipe; 201. Spiral fins; 202. Water inlet pipe; 3. High-temperature flue gas recovery device; 4. Condensate preheater; 5. Filter tank; 501. Motor; 502. Rotating frame; 503. Coarse filter screen; 504. Activated carbon layer; 505. Resin softening layer; 506. Water extraction pipe; 7. Steam turbine. Detailed Implementation Modes

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0021] Please refer to Figures 1-3 , a steam and water supply device for thermal power generation that is convenient to use, including a boiler 1 and a waste heat recovery unit. A steam pipeline 2 connected to a steam turbine 7 is installed inside the boiler 1. A spiral fin 201 is provided on the outer wall of the steam pipeline 2. A filtering unit is provided below the waste heat recovery unit;

[0022] The waste heat recovery unit includes a high-temperature flue gas recovery device 3 and a condensate preheater 4 connected by a flange. The high-temperature flue gas recovery device 3 is connected to the boiler 1 through a pipeline;

[0023] The filtering unit includes a filter tank 5 connected to the outlet of the condensate preheater 4 through a pipeline, a rotating frame 502 rotatably connected inside the filter tank 5, a coarse filter screen 503, an activated carbon layer 504, and a resin softening layer 505 installed inside the rotating frame 502 and distributed in sequence from top to bottom, and a motor 501 installed on the upper end face of the filter tank 5 and with its output end fixedly connected to the rotating frame 502.

[0024] In this embodiment: Water enters the steam pipeline 2. At the same time, the high-temperature flue gas generated by the combustion of the boiler 1 flows through the outside of the spiral fin 201 pipeline. The heat transfer area is enlarged through the spiral fin 201 to strengthen the heat exchange between the flue gas and the water. The heat transfer efficiency of the steam pipeline 2 is improved through the spiral fin 201. The water in the steam pipeline 2 is heated to become steam and then enters the steam turbine 7 for power generation. The waste gas in the boiler 1 enters the high-temperature flue gas recovery device 3 through a pipeline. The waste heat (waste gas) of the flue gas after the combustion of the boiler 1 is processed by the high-temperature flue gas recovery device 3. After the high-temperature recovery, the temperature of the flue gas decreases. At this time, the waste gas still contains a large amount of recoverable low-temperature waste heat. Then, the condensate preheater 4 further reduces the flue gas temperature by heating the feed water of the boiler 1 to realize the hierarchical extraction of heat energy. Then, the water preheated by the condensate preheater 4 removes impurities and softens the water quality in sequence through the coarse filter screen 503, the activated carbon layer 504, and the resin softening layer 505. Furthermore, by separating the steam and flue gas paths through the waste heat recovery unit, combining the enhanced heat transfer of the spiral fin 201 and the hierarchical recovery of waste heat, high efficiency and energy saving are achieved. With the cooperation of the three-stage filtering unit to ensure the cleanliness of the water quality, it has the advantages of simple structure, convenient operation, and low maintenance cost.

[0025] As a technical optimization scheme of the present invention, the fin spacing of the spiral fin 201 gradually decreases from top to bottom.

[0026] In this embodiment: By gradually reducing the fin spacing of the spiral fins 201 from top to bottom, it can adapt to the change of the flue gas temperature gradient, match the change of the flue gas temperature from high to low, avoid local overheating or insufficient heat exchange, and improve the overall efficiency.

[0027] As a technical optimization scheme of the present invention, a water extraction pipe 506 with a valve installed on its outer wall is connected between the outer wall of the filter tank 5 and the boiler 1.

[0028] In this embodiment: The pump on the outer wall of the water extraction pipe 506 can extract the filtered water in the filter tank 5 into the water inlet pipe 202 and then into the steam pipe 2 for use.

[0029] As a technical optimization scheme of the present invention, a support ring platform fixedly connected to the inside of the filter tank 5 and rotatably connected to the rotating frame 502 is provided.

[0030] In this embodiment: The support ring platform enables the rotating frame 502 to drive the multi-stage filtering structure to rotate stably in the filter tank 5.

[0031] As a technical optimization scheme of the present invention, a water inlet pipe 202 communicating with the steam pipe 2 is installed on the upper end surface of the boiler 1.

[0032] In this embodiment: By connecting the water inlet pipe 202 to an external water source, water can be introduced into the steam pipe 2.

[0033] As a technical optimization scheme of the present invention, the inner wall of the high-temperature flue gas recovery device 3 is coated with a corrosion-resistant coating.

[0034] In this embodiment: By coating the inner wall of the high-temperature flue gas recovery device 3 with a corrosion-resistant coating, the high-temperature flue gas recovery device 3 can have a corrosion-resistant effect, thereby extending the service life of the high-temperature flue gas recovery device 3.

[0035] Working principle and usage process of the present invention: Water enters the steam pipeline 2 through the water inlet pipe 202. At the same time, the high-temperature flue gas generated by the combustion of the boiler 1 flows through the outside of the spiral fin 201 pipeline. The heat transfer area is enlarged through the spiral fin 201 to strengthen the heat exchange between the flue gas and water. The heat transfer efficiency of the steam pipeline 2 is improved through the spiral fin 201. The water in the steam pipeline 2 is heated to become steam and then enters the steam turbine 7 for power generation. The waste gas in the boiler 1 enters the high-temperature flue gas recovery device 3 through the pipeline. The waste heat (waste gas) of the flue gas after the combustion of the boiler 1 is processed by the high-temperature flue gas recovery device 3. The temperature of the flue gas after the high-temperature recovery decreases. At this time, the waste gas still contains a large amount of recoverable low-temperature waste heat. Then, the condensate preheater 4 further reduces the flue gas temperature by heating the feed water of the boiler 1, realizing the hierarchical extraction of thermal energy. Then, the water preheated by the condensate preheater 4 enters the filter tank 5 through the pipeline, and successively passes through the coarse filter screen 503, the activated carbon layer 504, and the resin softening layer 505 to remove impurities and soften the water quality. The filtered water is pumped into the water inlet pipe 202 through the pump body via the water extraction pipe 506 and then enters the steam pipeline 2 for use. Furthermore, the waste heat recovery unit separates the steam and flue gas paths, combines the enhanced heat transfer of the spiral fin 201 and the hierarchical recovery of waste heat, realizes high-efficiency energy conservation, and cooperates with the three-stage filtering unit to ensure the water quality is clean, having the advantages of simple structure, convenient operation, and low maintenance cost.

[0036] The high-temperature flue gas recovery device 3 and the condensate preheater 4 are detachably connected through a flange, which is convenient for cleaning the accumulated ash.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0038] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components or the equivalent changes and modifications made according to the scope of the patent protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A steam-water supply device for thermal power generation which is convenient to use, comprising a boiler (1) and a waste heat recovery unit, characterized in that: A steam pipe (2) connected to a steam turbine (7) is installed inside the boiler (1), a spiral fin (201) is provided on the outer wall of the steam pipe (2), and a filter unit is provided below the waste heat recovery unit; The waste heat recovery unit comprises a high-temperature flue gas recovery device (3) and a condensate preheater (4) connected by flanges, wherein the high-temperature flue gas recovery device (3) is connected to the boiler (1) through a pipeline; The filtering unit comprises a filtering tank (5) connected to an outlet of a condensate preheater (4) through a pipeline, a rotating frame (502) rotatably connected to the inside of the filtering tank (5), a coarse filter (503), an activated carbon layer (504) and a resin softening layer (505) installed inside the rotating frame (502) and distributed in sequence from top to bottom, and a motor (501) installed on the upper end surface of the filtering tank (5) and with an output end fixedly connected to the rotating frame (502).

2. A steam-water supply device for thermal power generation that is easy to use according to claim 1, characterized in that: The fin spacing of the spiral fins (201) gradually decreases from top to bottom.

3. A steam-water supply device for thermal power generation that is easy to use according to claim 1, characterized in that: A water extraction pipe (506) with a valve installed on the outer wall is connected between the outer wall of the filter tank (5) and the boiler (1).

4. A steam-water supply device for thermal power generation that is easy to use according to claim 1, characterized in that: A supporting ring platform rotatably connected to the rotating frame (502) is fixedly connected inside the filter tank (5).

5. The easy-to-use steam-water supply device for thermal power generation according to claim 1, characterized in that: The upper end surface of the boiler (1) is provided with a water inlet pipe (202) which is in communication with the steam pipe (2).

6. A steam-water supply device for thermal power generation that is easy to use according to claim 1, characterized in that: The inner wall of the high-temperature flue gas recovery device (3) is coated with a corrosion-resistant coating.

Images