A feeding chute heating device and a waste incineration power plant

Abstract

The application relates to a feeding chute heating device and a waste incineration power plant, wherein the waste incineration power plant comprises a feeding chute and a chimney; the feeding chute heating device comprises a water jacket, a heat exchange pipeline, a circulating water tank and a circulating water pump which are sequentially connected; the water jacket is arranged on the feeding chute and forms a heating channel with the feeding chute; the circulating water tank comprises a circulating medium; the circulating water pump is used for conveying the circulating medium in the circulating water tank into the heating channel to heat the feeding chute; and the heat exchange pipeline is arranged on the chimney to heat the circulating medium by using the flue gas waste heat of the chimney. The application is a high-efficiency heat transfer equipment which heats the feeding chute by using the chimney waste heat and has the advantages of high heat transfer efficiency, compact structure, reliable work and the like.

Description

Technical Field

[0001] This application relates to the technical field of waste incineration power plants, and in particular to a feeding chute heating device and a waste incineration power plant. Background Technology

[0002] With the acceleration of urbanization, the amount of municipal solid waste generated is increasing daily. Waste-to-energy incineration, as an effective way to reduce, degrade, and recycle waste, is widely used globally. However, municipal solid waste in my country is generally characterized by high moisture content and low calorific value, which poses many challenges to waste-to-energy incineration. High-moisture waste requires a large amount of energy for moisture evaporation during incineration, leading to reduced combustion efficiency, increased energy consumption, and potentially affecting the stable operation of the incinerator and the quality of flue gas emissions. Therefore, improving the dryness of waste and reducing its moisture content is of great significance for improving the performance of waste-to-energy incineration systems.

[0003] The composition of municipal solid waste in my country is complex, mainly including organic matter, inorganic matter, plastics, paper, and textiles, with high levels of organic matter and moisture. The moisture content of waste directly affects its calorific value and incineration performance. When the moisture content is too high, a large amount of heat is required to evaporate the moisture during combustion, leading to difficulty in ignition, slower combustion speed, and lower furnace temperature, thus reducing incineration and power generation efficiency. Simultaneously, the large amount of water vapor generated by evaporation increases flue gas volume, burdening the flue gas purification system and increasing operating costs. Utility Model Content

[0004] To address the aforementioned technical challenges, this application innovatively proposes utilizing waste heat from the chimney to heat the feeding chute, aiming to improve waste drying efficiency and thus enhance the overall performance of the waste-to-energy incineration system. Through in-depth analysis of each component of the waste-to-energy incineration system, combined with heat exchange principles and practical engineering applications, this application provides a technical solution for recovering waste heat from the chimney and heating the feeding chute. This not only effectively utilizes previously wasted waste heat resources, improving waste drying and incineration efficiency, but also reduces energy consumption and pollutant emissions, providing a new technical path and reference for the sustainable development of the waste-to-energy incineration industry.

[0005] Specifically, this application provides a heating device for a feed chute in a waste-to-energy plant, the waste-to-energy plant including a feed chute and a chimney; the feeding chute heating device includes a water jacket, a heat exchange pipe, a circulating water tank, and a circulating water pump connected in sequence; the water jacket is disposed on the feed chute and forms a heating channel between the feed chute and the feed chute; the circulating water tank includes a circulating medium; the circulating water pump is used to transport the circulating medium in the circulating water tank to the heating channel to heat the feed chute; the heat exchange pipe is disposed on the chimney to utilize the waste heat of the flue gas from the chimney to heat the circulating medium.

[0006] As a preferred technical solution, the inlet of the heating channel is located at the lower end of the feeding chute, and the outlet is located at the upper end of the feeding chute.

[0007] As a preferred technical solution, a water replenishment pipe is used to replenish water to the circulating water tank; a first pressure sensor is installed on the water replenishment pipe, and the first pressure sensor is used to detect the pressure of the water replenishment pipe.

[0008] As a preferred technical solution, the circulating water tank further includes an electric heater, which is used to heat the circulating medium in the circulating water tank.

[0009] As a preferred technical solution, the heating channel is an annular channel.

[0010] As a preferred technical solution, the number of annular channels is two or more, and they are evenly arranged along the length of the feeding chute.

[0011] As a preferred technical solution, temperature sensors are respectively installed on the flue gas side and the hot water side of the heat exchange pipe, and the temperature sensors are used to monitor the flue gas temperature and the circulating medium temperature in real time.

[0012] As a preferred technical solution, the outer surface of the water jacket is covered with a heat insulation layer.

[0013] As a preferred technical solution, a second pressure sensor is provided between the water jacket and the circulating water pump. The second pressure sensor is used to detect the pressure of the circulating medium entering the water jacket.

[0014] In addition, this application also provides a waste incineration power plant, including the feeding chute heating device for a waste incineration power plant as described above.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] It makes efficient use of the waste heat from the chimney of the waste incineration power plant, avoids energy waste, and achieves effective recovery of the waste heat from the chimney. It recovers and reuses the waste heat from the chimney that was originally directly emitted into the atmosphere, replacing the traditional electric heating or steam heating methods, reducing additional energy consumption, and significantly reducing the operating cost of the waste incineration plant.

[0017] It has the advantages of high heat transfer efficiency, compact structure and reliable operation. It is particularly suitable for medium and low temperature waste heat recovery, realizes the cascade utilization of energy, enables the heat generated by waste incineration to be reused, improves the comprehensive energy utilization rate of the entire waste incineration power generation system, and meets the concept of sustainable development and energy conservation and emission reduction requirements.

[0018] It enables precise control of the heating temperature of the feed chute. When the flue gas temperature is too low or too high, it automatically starts the auxiliary heating device or takes cooling measures to ensure the normal operation of the system.

[0019] Multiple layers of insulation material are wrapped around the water jacket to reduce heat loss. Simultaneously, the insulation layer undergoes waterproofing and corrosion-resistant treatment to extend its service life.

[0020] Improving waste drying efficiency effectively increases the degree of dryness and reduces the moisture content of waste. Dried waste is more easily combusted, improving combustion efficiency and ensuring more complete combustion, thus increasing the thermal efficiency of the incinerator and boosting power generation.

[0021] The stable moisture content of the waste reduces the impact of fluctuations in waste humidity on the incineration process, making parameters such as temperature and pressure inside the incinerator more stable, reducing the probability of problems such as coking and ash accumulation during incineration, extending the service life of the incinerator, and reducing equipment maintenance costs.

[0022] Complete combustion of waste reduces emissions of pollutants such as carbon monoxide and dioxins caused by incomplete combustion, thereby reducing air pollution and helping companies meet stricter environmental emission standards.

[0023] Improved incineration efficiency leads to increased power generation, which in turn increases revenue from power generation; at the same time, reduced energy consumption and equipment maintenance costs further improve the company's economic benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0026] Figure 1 This is a schematic diagram of the overall structure of a feeding chute heating device for a waste incineration power plant, as described in an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0028] In the description of this application, it should be understood that the orientations or positional relationships indicated by terms, etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device, element, module, system, platform, or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The following description of this application is only to be understood as a description of individual embodiments of the technical solutions of this application. Other embodiments are not reflected in the following description, but this does not mean that this application excludes these other embodiments, nor is the technical solution of this application limited to the specific implementations described below, and the protection scope of this application is not limited to the specific implementations described below. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this application.

[0029] It should be noted that if the terms "first," "second," etc., appear in the specification, claims, and accompanying drawings of this application, such descriptions are only used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that comprises a series of units, modules, or components is not necessarily limited to those explicitly listed, but may include other components not explicitly listed or inherent to such systems, products, or devices.

[0030] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] As the final stage equipment of waste-to-energy plants, chimneys emit flue gas containing a large amount of waste heat. Currently, most waste-to-energy plants have a low utilization rate of this waste heat, which not only wastes energy but also increases thermal pollution to the environment. This application aims to recover waste heat from chimneys and use it to heat the feed chute, ensuring that the waste is fully dried before entering the incinerator. This not only effectively utilizes waste heat resources but also improves the incineration conditions, achieving cascaded energy utilization and efficient resource recovery, resulting in significant economic, environmental, and social benefits.

[0032] Typically, the flue gas temperature at the inlet of a waste-to-energy incineration plant chimney is around 130℃-180℃. Although this falls into the category of low-temperature waste heat, the total heat contained within the large volume of flue gas is not negligible. Chimney waste heat has the following characteristics: firstly, its temperature is relatively stable and less affected by the composition of the waste and the incineration conditions; secondly, its waste heat quality is relatively low, making it difficult to directly utilize for high-grade energy needs, but it is suitable for some processes with less stringent temperature requirements, such as waste drying. Therefore, the chimney preheating utilization proposed in this application can bring significant economic and technical benefits.

[0033] In some embodiments, such as Figure 1 As shown, this application provides a heating device 1 for a feed chute in a waste-to-energy plant. The waste-to-energy plant includes a feed chute 2 and a chimney 3. The heating device 1 includes a water jacket 11, a heat exchange pipe 12, a circulating water tank 13, and a circulating water pump 14 connected in sequence. Specifically, the sequential connections can be made through conveying pipes, the outer surface of which is wrapped with an insulation layer to reduce heat loss. The insulation layer is also waterproofed and corrosion-resistant to extend its service life.

[0034] The water jacket 11 is disposed on the feed chute 2 and forms a heating channel 111 between the feed chute 2 and the feed chute 2. The water jacket 11 is made of a metal material with good thermal conductivity to ensure that heat can be quickly transferred to the interior of the feed chute 2. The inlet of the heating channel 111 is located at the lower end of the feed chute 2 and the outlet is located at the upper end of the feed chute 2. The feed chute 2 is fully heated by the bottom-in and top-out method. The heating channel 111 is an annular channel, which is more conducive to uniform heating. There are two or more annular channels, which are evenly arranged along the length of the feed chute 2. Multiple annular channels make the heating speed faster. The outer surface of the water jacket is covered with a heat insulation layer to reduce heat loss. At the same time, the heat insulation layer is waterproofed and corrosion-resistant to extend its service life.

[0035] The circulating water tank 13 includes a circulating medium (not shown); the circulating water tank 13 also includes an electric heater 131, which is used to heat the circulating medium in the circulating water tank 13.

[0036] The circulating water pump 14 is used to transport the circulating medium in the circulating water tank 13 to the heating channel 111 to heat the feed chute 2.

[0037] The heat exchange pipe 12 is installed on the chimney 3 to utilize the waste heat from the flue gas in the chimney 3 to heat the circulating medium. Temperature sensors (not shown) are installed on both the flue gas side and the hot water side of the heat exchange pipe 12, respectively, to monitor the flue gas temperature and the circulating medium temperature in real time. Based on the set target hot water temperature, the flow rate of the hot water is controlled by adjusting the speed of the circulating water pump, thereby achieving precise control of the heating temperature of the feed chute. When the flue gas temperature is too low, the electric heater 131 is automatically activated to ensure the normal operation of the system.

[0038] In some embodiments, such as Figure 1 As shown, the feeding chute heating device 1 of this application also includes a water replenishment pipe 15 for replenishing water to the circulating water tank 13; a first pressure sensor 151 is provided on the water replenishment pipe 15, and the first pressure sensor 151 is used to detect the pressure of the water replenishment pipe 15.

[0039] In some embodiments, such as Figure 1 As shown, a second pressure sensor 141 is provided between the water jacket 11 and the circulating water pump 14. The second pressure sensor 141 is used to detect the pressure of the circulating medium entering the water jacket 11.

[0040] In some embodiments, this application also provides a waste-to-energy plant, including the feeding chute heating device 1 for a waste-to-energy plant as described above.

[0041] The circulating water pump 14 of this application transports the circulating medium to the feed chute 2, and then through the heat exchange pipe 12 of the chimney 3. The high-temperature flue gas discharged from the chimney 2 enters the flue gas side of the heat exchange pipe and exchanges heat with the circulating medium inside the heat exchange pipe. After being heated, the circulating medium enters the circulating water tank 13 by gravity, completing one cycle. The circulating water tank 13 is equipped with an electric heater 131, which is activated to provide auxiliary heating when the temperature of the circulating medium cannot reach the required level.

[0042] This application recovers and utilizes waste heat from chimneys that were originally directly emitted into the atmosphere, replacing traditional electric or steam heating methods. This reduces additional energy consumption and significantly lowers the operating costs of waste incineration plants. It achieves cascaded energy utilization, allowing the heat generated during waste incineration to be reused, improving the overall energy utilization rate of the entire waste-to-energy system, aligning with sustainable development principles and energy conservation and emission reduction requirements. It effectively increases the dryness of waste, reducing its moisture content. Dryer waste is easier to burn, improving combustion efficiency and ensuring more complete combustion, thus increasing the thermal efficiency of the incinerator and boosting power generation. It also stabilizes the moisture content of waste, reducing the impact of humidity fluctuations on the incineration process, resulting in more stable parameters such as temperature and pressure within the incinerator. This reduces the probability of coking and ash accumulation during incineration, extending the incinerator's lifespan and reducing equipment maintenance costs. Furthermore, complete combustion reduces emissions of pollutants such as carbon monoxide and dioxins from incomplete combustion, lowering atmospheric pollution and helping companies meet stricter environmental emission standards. Increased incineration efficiency leads to increased power generation, thereby increasing revenue. Simultaneously, reduced energy and equipment maintenance costs further improve the company's economic benefits.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-described embodiments are merely illustrative of several implementation methods of this application and are only used to illustrate the technical solutions of this application, not to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. For those skilled in the art, several variations and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

Claims

1. A heating device for a feed chute in a waste-to-energy incineration plant, the waste-to-energy incineration plant comprising a feed chute and a chimney; characterized in that: The feeding chute heating device includes a water jacket, a heat exchange pipe, a circulating water tank, and a circulating water pump connected in sequence; the water jacket is disposed on the feeding chute and forms a heating channel between the feeding chute and the feeding chute; the circulating water tank includes a circulating medium; the circulating water pump is used to transport the circulating medium in the circulating water tank to the heating channel to heat the feeding chute; the heat exchange pipe is disposed on the chimney to utilize the waste heat of the flue gas from the chimney to heat the circulating medium.

2. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: The inlet of the heating channel is located at the lower end of the feeding chute, and the outlet is located at the upper end of the feeding chute.

3. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that, Also includes: A water supply pipe is used to replenish water to the circulating water tank; a first pressure sensor is installed on the water supply pipe, which is used to detect the pressure of the water supply pipe.

4. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: The circulating water tank also includes an electric heater, which is used to heat the circulating medium in the circulating water tank.

5. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: The heating channel is an annular channel.

6. The heating device for the feed chute in a waste incineration power plant according to claim 5, characterized in that: The number of annular channels is two or more, and they are evenly arranged along the length of the feed chute.

7. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: Temperature sensors are installed on the flue gas side and the hot water side of the heat exchange pipe, respectively, and the temperature sensors are used to monitor the flue gas temperature and the circulating medium temperature in real time.

8. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: The outer surface of the water jacket is covered with an insulation layer.

9. The heating device for the feed chute in a waste incineration power plant according to claim 1, characterized in that: A second pressure sensor is provided between the water jacket and the circulating water pump. The second pressure sensor is used to detect the pressure of the circulating medium entering the water jacket.

10. A waste-to-energy incineration plant, characterized in that... Includes the heating device for the feed chute of a waste incineration power plant as described in any one of claims 1-9.

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