Coal-fired boiler system

Abstract

The utility model discloses a coal-fired boiler system, which comprises a transmission channel, a coal-fired boiler, a coal-fired boiler, a coal-fired boiler, a coal-fired boiler, a coal-fired boiler, a coal-fired boiler, a coal-fired boiler and a coal-fired boiler, the microwave heating device is arranged on the transmission channel and is used for heating the air-powder mixture in the transmission channel; and the electromagnetic heating device is arranged on the transmission channel and is used for heating the air powder mixture in the transmission channel. According to the coal-fired boiler system provided by the utility model, the preheating of the air-powder mixture is realized, the temperature of the air-powder mixture is increased, the air-powder mixture is easier to ignite, the combustion efficiency of the air-powder mixture is improved, the energy waste and the environmental pollution are reduced, and the microwave heating enables the heated material to become a heating body, so that the energy consumption is reduced. A heat conduction process is not needed, the temperature of an air powder mixture can be rapidly increased, electric energy is directly converted into heat energy through electromagnetic heating, the energy conversion efficiency is high, energy loss is reduced, and the heating efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of coal-fired power generation technology, and in particular to a coal-fired boiler system. Background Technology

[0002] Related technologies indicate that my country's energy structure is dominated by coal, and coal-fired power generation, as a crucial component of the power industry, directly impacts national energy security and economic development in terms of stability and efficiency. During the operation of a coal-fired power unit, the pulverizing system is a key component. This system grinds coal into pulverized coal using a pulverizer and mixes it with primary air to form a gas-solid two-phase air-coal mixture. The temperature of this air-coal mixture is a critical factor affecting the combustion stability, ignition rate, and combustion efficiency of the pulverized coal, and has a vital impact on the boiler efficiency and combustion stability of the coal-fired power unit.

[0003] However, in actual operation of coal-fired power units, the pulverizing system presents serious safety hazards, such as pulverized coal deflagration. Therefore, to ensure safe operation, the upper limit of the temperature of the pulverized coal mixture at the mill outlet is strictly limited. This significantly restricts pulverized coal ignition, making it difficult to achieve ideal combustion efficiency. Furthermore, during the transport of the pulverized coal mixture from the mill outlet to the burner inlet, the temperature decreases to some extent due to heat dissipation through the pulverized coal pipes, further affecting pulverized coal ignition, reducing ignition stability, and delaying ignition time. This may lead to incomplete combustion of pulverized coal in the furnace, increasing heat loss from incomplete chemical and mechanical combustion, and negatively impacting the boiler's combustion and thermal efficiency.

[0004] To address these issues, several solutions have been proposed. One approach involves introducing hot flue gas or steam extracted from the turbine to preheat the pulverized coal mixture. However, this system is complex, has poor heat exchange efficiency, and the heating rate and effect are difficult to control. Another method involves pressurizing the primary air with a booster fan before directing it into the furnace to enhance pulverized coal preheating, effectively reducing the difficulty of pulverized coal ignition and promoting stable combustion of the boiler under low load conditions. However, this method is complex, has a large impact area, and the booster fan alters the flow field in the upstream and downstream pipes of the pulverizing system, making precise and rapid temperature control difficult. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a coal-fired boiler system that can improve energy conversion efficiency and reduce energy loss.

[0006] The coal-fired boiler system according to this utility model includes: a transmission channel configured to transmit a coal-air mixture; a microwave heating device disposed on the transmission channel for heating the coal-air mixture within the transmission channel; and an electromagnetic heating device disposed on the transmission channel for heating the coal-air mixture within the transmission channel.

[0007] According to the coal-fired boiler system of this utility model, by setting up a microwave heating device and an electromagnetic heating device, the air-coal mixture is preheated, thereby increasing the temperature of the air-coal mixture, making it easier to ignite, improving the combustion efficiency of the air-coal mixture, reducing energy waste and environmental pollution. Furthermore, microwave heating makes the heated material itself the heating element, eliminating the need for heat conduction, resulting in fast heating and rapid increase in the temperature of the air-coal mixture. Electromagnetic heating directly converts electrical energy into heat energy, resulting in high energy conversion efficiency, reducing energy loss, and achieving high heating efficiency.

[0008] In some embodiments, the coal-fired boiler system further includes a temperature sensor disposed within the transmission channel for monitoring the temperature of the air-coal mixture within the transmission channel.

[0009] In some embodiments, the temperature sensor has at least two sensors, which are arranged spaced apart within the transmission channel along the transmission direction of the air-powder mixture.

[0010] In some embodiments, the coal-fired boiler system further includes a control module, which is electrically connected to the microwave heating device, the electromagnetic heating device, and the temperature sensor.

[0011] In some embodiments, the coal-fired boiler system further includes: an adjustment component electrically connected to the microwave heating device and / or the electromagnetic heating device, and the adjustment component electrically connected to the control module.

[0012] In some embodiments, the adjustment assembly includes: a first adjustment member and a second adjustment member, wherein the first adjustment member is electrically connected to the microwave heating device to adjust the heating power of the microwave heating device, and the second adjustment member is electrically connected to the electromagnetic heating device to adjust the heating power of the electromagnetic heating device.

[0013] In some embodiments, the coal-fired boiler system further includes: a power source, wherein there are multiple power sources, each of which is electrically connected to the microwave heating device and the electromagnetic heating device.

[0014] In some embodiments, the power supply includes an external power supply and a plant power supply, both of which are electrically connected to the microwave heating device and the electromagnetic heating device.

[0015] In some embodiments, the coal-fired boiler system further includes a coal mill connected to the transmission channel to deliver an air-coal mixture into the transmission channel.

[0016] In some embodiments, the coal-fired boiler system further includes a judgment module, which is electrically connected to both the temperature sensor and the control module to determine whether the current temperature monitored by the temperature sensor meets the target temperature.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a coal-fired boiler system according to Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of a coal-fired boiler system according to Embodiment 2 of this utility model;

[0020] Figure 3 This is a schematic diagram of a coal-fired boiler system according to Embodiment 3 of this utility model;

[0021] Figure 4 This is a schematic diagram of a coal-fired boiler system according to Embodiment 4 of this utility model;

[0022] Figure 5 This is a schematic diagram of a coal-fired boiler system according to Embodiment 5 of this utility model;

[0023] Figure 6 This is a schematic diagram of the judgment logic of a coal-fired boiler system according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Coal-fired boiler system; 1. Transmission channel; 2. Microwave heating device; 3. Electromagnetic heating device; 4. Temperature sensor; 5. First regulating component; 6. Second regulating component; 7. External power supply; 8. Plant power supply; 9. Control module; 200. Air-coal mixture. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following is for reference. Figures 1-6 A coal-fired boiler system 100 according to an embodiment of the present utility model is described.

[0028] like Figures 1-6 As shown, the coal-fired boiler system 100 according to an embodiment of the present utility model includes: a transmission channel 1, a microwave heating device 2, and an electromagnetic heating device 3.

[0029] Specifically, the transmission channel 1 is configured to transport the air-coal mixture 200. A microwave heating device 2 is disposed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1, and an electromagnetic heating device 3 is disposed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. It can be understood that the transmission channel 1 is used to transport the air-coal mixture 200 from the storage or preparation area to the combustion area. The microwave heating device 2 and the electromagnetic heating device 3 are used to preheat the air-coal mixture 200 during its transport process. This effectively increases the temperature of the air-coal mixture 200, making it easier to ignite, improving combustion efficiency, and reducing energy waste and environmental pollution.

[0030] According to the embodiment of the present invention, the coal-fired boiler system 100 preheats the air-coal mixture 200 by setting up a microwave heating device 2 and an electromagnetic heating device 3, thereby increasing the temperature of the air-coal mixture 200, making it easier to ignite, improving the combustion efficiency of the air-coal mixture 200, reducing energy waste and environmental pollution. Furthermore, microwave heating makes the heated material itself the heating element, eliminating the need for heat conduction, resulting in fast heating and rapid increase in the temperature of the air-coal mixture 200. Electromagnetic heating directly converts electrical energy into heat energy, resulting in high energy conversion efficiency, reduced energy loss, and high heating efficiency.

[0031] It should be noted that the above-mentioned air-powder mixture 200 is a gas-solid two-phase mixture after pulverized coal and primary air are mixed.

[0032] In some embodiments of this utility model, the coal-fired boiler system 100 further includes a temperature sensor 4, which is disposed within the transmission channel 1 and used to monitor the temperature of the air-coal mixture 200 within the transmission channel 1. Furthermore, at least two temperature sensors 4 are arranged spaced apart within the transmission channel 1 along the transmission direction of the air-coal mixture 200. Figure 1 and Figure 2 As shown, there are two temperature sensors 4, which are arranged spaced apart within the transmission channel 1 along the transmission direction of the air-powder mixture 200; Figure 3 and Figure 4 As shown, there are three temperature sensors 4, which are arranged spaced apart within the transmission channel 1 along the transmission direction of the air-powder mixture 200; as Figure 5 As shown, there are four temperature sensors 4, which are spaced apart within the transmission channel 1 along the transmission direction of the air-powder mixture 200. This allows for more accurate measurement of the temperature of the air-powder mixture 200 at various locations within the transmission channel 1, resulting in better preheating of the air-powder mixture 200.

[0033] In some embodiments of this utility model, the coal-fired boiler system 100 further includes a control module 9, which is electrically connected to the microwave heating device 2, the electromagnetic heating device 3, and the temperature sensor 4. This facilitates the control of the microwave heating device 2 and the electromagnetic heating device 3, reducing the difficulty of control.

[0034] In some embodiments of this utility model, the coal-fired boiler system 100 further includes an adjustment component, which is electrically connected to the microwave heating device 2 and / or the electromagnetic heating device 3, and is also electrically connected to the control module 9. Specifically, the adjustment component includes a first adjustment element 5 and a second adjustment element 6. The first adjustment element 5 is electrically connected to the microwave heating device 2 to adjust the heating power of the microwave heating device 2, and the second adjustment element 6 is electrically connected to the electromagnetic heating device 3 to adjust the heating power of the electromagnetic heating device 3. This facilitates the adjustment of the heating power of the microwave heating device 2 and the heating power of the electromagnetic heating device 3.

[0035] In some embodiments of this utility model, the coal-fired boiler system 100 further includes: a power supply, wherein there are multiple power supplies, and all multiple power supplies are electrically connected to the microwave heating device 2 and the electromagnetic heating device 3. That is to say, the power supply can be an external power supply 7 or a plant power supply 8, both of which can supply power to the coal-fired boiler system 100 of this utility model embodiment to ensure that the coal-fired boiler system 100 can work continuously.

[0036] In some embodiments of this utility model, the coal-fired boiler system 100 further includes: a coal mill, which is connected to the transmission channel 1 to convey the air-coal mixture 200 into the transmission channel 1; and a judgment module, which is electrically connected to both the temperature sensor 4 and the control module 9 to determine whether the current temperature monitored by the temperature sensor 4 meets the target temperature. Therefore, the coal-fired boiler system 100 has a simple structure, ingenious design, and a high degree of automation.

[0037] The following will refer to Figures 1-6 This invention describes a coal-fired boiler system 100 according to five specific embodiments of the present invention.

[0038] Example 1,

[0039] Reference Figure 1The coal-fired boiler system 100 includes: a transmission channel 1, a microwave heating device 2, a control module 9, an adjustment component, and a power supply. Specifically, the microwave heating device 2 is installed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. Two temperature sensors 4 are arranged spaced apart within the transmission channel 1 along the transmission direction of the air-coal mixture 200. The control module 9 is electrically connected to the microwave heating device 2. The adjustment component includes a first adjustment element 5, which is electrically connected to the microwave heating device 2 to adjust the heating power of the microwave heating device 2. Multiple power supplies are present, all of which are electrically connected to the microwave heating device 2.

[0040] like Figure 6 As shown, firstly, pulverized coal is mixed with primary air to form a pulverized coal mixture 200, and the current temperature of the pulverized coal mixture 200 is obtained. Then, it is determined whether the current temperature meets the target temperature, and then the current temperature is adjusted to the target temperature.

[0041] Example 2,

[0042] like Figure 2 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that microwave heating device 2 is used for heating in Embodiment 1, while electromagnetic heating device 3 is used for heating in this Embodiment 2.

[0043] Reference Figure 2 The coal-fired boiler system 100 includes: a transmission channel 1, an electromagnetic heating device 3, a control module 9, an adjustment component, and a power supply. Specifically, the electromagnetic heating device 3 is installed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. Two temperature sensors 4 are arranged spaced apart within the transmission channel 1 along the transmission direction of the air-coal mixture 200. The control module 9 is electrically connected to the electromagnetic heating device 3. The adjustment component includes a first adjustment element 5, which is electrically connected to the electromagnetic heating device 3 to adjust the heating power of the electromagnetic heating device 3. Multiple power supplies are present, all of which are electrically connected to the electromagnetic heating device 3.

[0044] Example 3,

[0045] like Figure 3As shown, the coal-fired boiler system 100 includes: a transmission channel 1, a microwave heating device 2, a control module 9, an adjustment component, and a power supply. Specifically, the microwave heating device 2 is installed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. There are three temperature sensors 4, which are spaced apart along the transmission direction of the air-coal mixture 200 within the transmission channel 1. A microwave heating device 2 is installed between every two adjacent temperature sensors 4. The control module 9 is electrically connected to the microwave heating device 2. The adjustment component includes a first adjustment element 5, which is electrically connected to the microwave heating device 2 to adjust the heating power of the microwave heating device 2. There are multiple power supplies, all of which are electrically connected to the microwave heating device 2.

[0046] Example 4,

[0047] like Figure 4 As shown, the coal-fired boiler system 100 includes: a transmission channel 1, an electromagnetic heating device 3, a control module 9, an adjustment component, and a power supply. Specifically, the electromagnetic heating device 3 is installed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. There are three temperature sensors 4, spaced apart along the transmission direction of the air-coal mixture 200 within the transmission channel 1. An electromagnetic heating device 3 is installed between every two adjacent temperature sensors 4. The control module 9 is electrically connected to the electromagnetic heating device 3. The adjustment component includes a first adjustment element 5, which is electrically connected to the electromagnetic heating device 3 to adjust its heating power. There are multiple power supplies, all of which are electrically connected to the electromagnetic heating device 3.

[0048] Example 5,

[0049] like Figure 5As shown, the coal-fired boiler system 100 includes: a transmission channel 1, an electromagnetic heating device 3, a microwave heating device 2, a control module 9, an adjustment component, and a power supply. Specifically, the microwave heating device 2 and the electromagnetic heating device 3 are installed on the transmission channel 1 to heat the air-coal mixture 200 within the transmission channel 1. Four temperature sensors 4 are arranged spaced apart along the transmission direction of the air-coal mixture 200 within the transmission channel 1, with each pair of temperature sensors forming a group. An electromagnetic heating device 3 is installed between two temperature sensors in one group of two temperature sensors 4, and a microwave heating device 2 is installed between two temperature sensors in the other group of two temperature sensors 4. The control module 9 is electrically connected to both the electromagnetic heating device 3 and the microwave heating device 2. The adjustment component includes: a first adjustment element 5 and a second adjustment element 6. The first adjustment element 5 is electrically connected to the microwave heating device 2 to adjust its heating power, and the second adjustment element 6 is electrically connected to the electromagnetic heating device 3 to adjust its heating power. Multiple power supplies are provided, all of which are electrically connected to both the electromagnetic heating device 3 and the microwave heating device 2.

[0050] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element 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 utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A coal-fired boiler system, characterized in that, include: A transmission channel configured to transport a mixture of air and powder; A microwave heating device, which is disposed on the transmission channel for heating the air-powder mixture in the transmission channel; An electromagnetic heating device is provided on the transmission channel for heating the air-powder mixture in the transmission channel.

2. The coal-fired boiler system according to claim 1, characterized in that, Also includes: A temperature sensor is installed in the transmission channel to monitor the temperature of the air-powder mixture in the transmission channel.

3. The coal-fired boiler system according to claim 2, characterized in that, The temperature sensor has at least two sensors, which are arranged spaced apart in the transmission channel along the transmission direction of the air-powder mixture.

4. The coal-fired boiler system according to claim 3, characterized in that, Also includes: The control module is electrically connected to the microwave heating device, the electromagnetic heating device, and the temperature sensor.

5. The coal-fired boiler system according to claim 4, characterized in that, Also includes: An adjustment component is electrically connected to the microwave heating device and / or the electromagnetic heating device, and the adjustment component is also electrically connected to the control module.

6. The coal-fired boiler system according to claim 5, characterized in that, The adjustment assembly includes a first adjustment element and a second adjustment element. The first adjustment element is electrically connected to the microwave heating device to adjust the heating power of the microwave heating device, and the second adjustment element is electrically connected to the electromagnetic heating device to adjust the heating power of the electromagnetic heating device.

7. The coal-fired boiler system according to any one of claims 1-6, characterized in that, Also includes: The power supply is provided in multiple forms, and each of the multiple power supplies is electrically connected to the microwave heating device and the electromagnetic heating device.

8. The coal-fired boiler system according to claim 7, characterized in that, The power supply includes an external power supply and a plant power supply, both of which are electrically connected to the microwave heating device and the electromagnetic heating device.

9. The coal-fired boiler system according to any one of claims 1-6, characterized in that, Also includes: A coal mill connected to the transmission channel to convey a coal-air mixture into the transmission channel.

10. The coal-fired boiler system according to claim 4, characterized in that, Also includes: The judgment module is electrically connected to both the temperature sensor and the control module to determine whether the current temperature monitored by the temperature sensor meets the target temperature.

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