Detection system for alkali metal conversion in coal-fired power generation

Abstract

The utility model provides a detection system for alkali metal conversion in coal-fired power generation. The detection system comprises a settling furnace, a heating device, a gas phase detector, a pulverized coal bunker, a solid phase detector and a separator, one end of the settling furnace is communicated with the pulverized coal bunker; the heating devices are arranged on the furnace wall of the settling furnace at intervals in the axial direction of the settling furnace. The gas phase detector is fixedly arranged at the end, close to the pulverized coal bunker, of the settling furnace. The solid phase detector is communicated with the settling furnace through the separator; after the heating device is started, the gas phase detector detects the metal content of flue gas in the settling furnace, and the solid phase detector detects the metal content of coal ash in the settling furnace. The settling furnace is arranged to simulate the internal environment of a grate-fired furnace or a pulverized coal furnace industrial boiler, after pulverized coal in the pulverized coal bunker enters the settling furnace, products of all stages after pulverized coal combustion are received and detected by the gas phase detector and the solid phase detector respectively, and therefore the conversion process of alkali metal in all stages of pulverized coal combustion is tracked.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal-fired power generation technical field especially relates to a detection system for alkali metal conversion in coal-fired power generation. BACKGROUND

[0002] High alkali coal resources reserves are rich in our country, have low ash content, medium high volatile matter, high reactivity and other characteristics, are high-quality power and chemical coal, and shallow burying, coal seam is thick, coal number is more, easy to exploit. However, high alkali coal ash content of alkali metal (Na, K) has a large proportion, especially Na content, far higher than that of other coal producing areas in our country. Therefore, in the use of high alkali coal, serious contamination and slagging phenomenon will appear, which will reduce the heat transfer efficiency of the boiler, cause safety problems and economic losses, and even cause the bridging of ash and slag between the heat receiving surface tubes, boiler blockage, pipe explosion and other serious accidents, resulting in uncontrollable consequences. At present, the biggest constraint factor of large-scale safe use of high alkali coal is the high content of alkali metal in it, and the characteristics and content of alkali metal need to be fully understood, and then targeted measures are taken to avoid contamination and slagging problems. SUMMARY

[0003] In order to solve the problem of how to measure the conversion of high alkali metal coal in each process of combustion in the background art, the utility model provides the following technical scheme:

[0004] A detection system for alkali metal conversion in coal-fired power generation, comprising: a settling furnace, a heating device, a gas phase detector, a coal powder bin, a solid phase detector and a separator; one end of the settling furnace is communicated with the coal powder bin, and the other side of the settling furnace is connected with the separator; the heating device is arranged on the furnace wall of the settling furnace along the axial direction of the settling furnace, and the gas phase detector is fixedly arranged at one end of the settling furnace close to the coal powder bin; the solid phase detector is communicated with the settling furnace through the separator; when the heating device is started, the gas phase detector detects the metal content of the flue gas in the settling furnace, and the solid phase detector detects the metal content of the coal ash in the settling furnace.

[0005] The detection system further comprises a slagging rod, one end of the slagging rod penetrates into the settling furnace along the radial direction of the settling furnace, and the other end of the slagging rod is connected with a water cooling loop.

[0006] Further, one end of the settling furnace away from the coal powder bin is provided with an ash collecting hopper, and the ash collecting hopper is connected with the separator to discharge the coal ash and flue gas in the settling furnace.

[0007] Further, the top of the separator is connected with an induced draft fan, and the bottom of the separator is connected with the solid phase detector.

[0008] Further, the detection system further comprises a guide pipe and a blower, one end of the guide pipe is bent and connected with the end of the settling furnace, the other end of the guide pipe is connected with the blower, and the output end of the coal powder bin is connected with the guide pipe.

[0009] Further, the heating device comprises a plurality of electric heating rods connected with the electric heating cabinet, each of the electric heating rods is fixed on the inner wall of the settling furnace, and each of the electric heating rods is located below the gas phase detector.

[0010] Further, the inner wall of the settling furnace is provided with a heat preservation layer, and each of the electric heating rods penetrates through the heat preservation layer.

[0011] Beneficial effects: the internal environment of the layer combustion furnace or the pulverized coal furnace industrial boiler is simulated by the settling furnace, the products of each stage after the combustion of the pulverized coal in the coal powder bin are received and detected by the gas phase detector and the solid phase detector, and thus the conversion process of the alkali metal in each stage of the combustion of the pulverized coal is tracked. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of a detection system for conversion of alkali metal in coal-fired power generation according to an embodiment of the utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the present application more clear, the utility model will be described in further detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0014] It should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the patent and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent.

[0015] Figure 1 It is a structural schematic view of a detection system for conversion of alkali metal in coal-fired power generation according to an embodiment of the utility model.

[0016] REFERENCE Figure 1The utility model discloses a detection system for alkali metal conversion in coal-fired power generation, which comprises a settling furnace 1, a heating device 2, a gas phase detector 3, a coal powder bin 4, a solid phase detector 5 and a separator 6. The settling furnace 1 is mainly used for burning coal powder to provide a simulated experimental environment for the detection of alkali metal. One end of the settling furnace 1 is in communication with the coal powder bin 4, and the other end of the settling furnace 1 is connected to the separator 6. The heating device 2 is arranged on the furnace wall of the settling furnace 1 along the axial direction of the settling furnace 1 at intervals to meet the temperature conditions required for different combustion stages and reaction processes of the coal powder in the settling furnace 1. The gas phase detector 3 is fixedly installed on the inner wall of the settling furnace 1 near the end of the coal powder bin 4 to detect the flue gas generated by combustion. The solid phase detector 5 is connected to the settling furnace 1 through the separator 6 to detect the fly ash generated by combustion.

[0017] When the heating device 2 starts to operate, the coal powder in the settling furnace 1 begins to burn and generates flue gas containing alkali metal. Based on specific chemical analysis techniques and sensor technologies, the gas phase detector 3 can identify and quantitatively analyze the characteristic signals generated by alkali metal elements and their compounds in the flue gas, thereby obtaining accurate data of the metal content in the flue gas. During the combustion process, the fly ash and flue gas formed after the combustion of coal powder are transmitted to the separator 6 in the system. After the separation of the separator 6, the fly ash is guided to the solid phase detector 5, and the flue gas is discharged outward. The solid phase detector 5 detects the metal content of the fly ash in the settling furnace 1 by using corresponding physical and chemical detection methods, such as X-ray fluorescence spectrum analysis and atomic absorption spectrum analysis, to determine the alkali metal content in the fly ash.

[0018] Further, in the present embodiment, the detection system further comprises a guide pipe 8 and a blower 9. One end of the guide pipe 8 is in the form of a bend, and the bent part is connected to the end of the settling furnace 1, thereby constructing a specific material transmission channel. The other end of the guide pipe 8 is connected to the blower 9, and the output end of the coal powder bin 4 is in communication with the guide pipe 8. When the coal powder in the coal powder bin 4 is input into the guide pipe 8, under the driving of the blower 9, the airflow flows in the guide pipe 8, and the coal powder output from the coal powder bin 4 is transported along the guide pipe 8 to the settling furnace 1, thereby improving the transportation efficiency of the coal powder.

[0019] Specifically, the heating device 2 comprises a plurality of electric heating rods 22, each of which is electrically connected with the electric heating cabinet 21, and the temperature of each electric heating rod 22 is controlled by the operator through the external electric heating cabinet 21, so as to promote the coal powder entering the settling furnace 1 to start combustion. Each electric heating rod 22 is fixedly arranged on the inner wall of the settling furnace 1, and each electric heating rod 22 is located at a position below the gas phase detector 3. In addition, in order to maintain the internal temperature of the entire settling furnace 1, the inner wall surface of the settling furnace 1 is further covered with a heat preservation layer 11 to reduce heat loss, improve heating efficiency and maintain the stability of the temperature in the settling furnace 1. Each electric heating rod 22 penetrates through the heat preservation layer 11 to realize contact with the internal space of the settling furnace 1, so as to be capable of directly heating the interior of the settling furnace 1. In this embodiment, the heat preservation layer 11 is composed of high-temperature refractory material and a stainless steel shell, and the high-temperature refractory material can be ceramic fiber cotton, zirconia fiber cotton, etc., and the alkali metal includes substances containing sodium and potassium elements, etc. The gas phase detector is an instrument based on flame spectroscopy or laser-induced breakdown spectroscopy. The solid phase detector includes but is not limited to X-ray diffraction analysis (XRD), wavelength dispersive X-ray fluorescence spectrometer (WD-XRF) and scanning electron microscope (SEM), etc.

[0020] When the electric heating cabinet 21 is turned on and operated, electric energy can be provided to each electric heating rod 22 according to preset temperature parameters and control programs, and the electric heating rod 22 further converts the electric energy into heat energy to release heat at the position where it is located. Since the plurality of electric heating rods 22 are distributed along the axial direction of the settling furnace 1 at intervals, the heat can be more uniformly diffused in the interior of the settling furnace 1, and the overall temperature in the settling furnace 1 is gradually increased to create a suitable high-temperature environment for the coal combustion reaction in the settling furnace 1, so as to ensure that the reaction can be stably carried out under the specified temperature conditions during the detection of the conversion of alkali metal in the process of coal-fired power generation, which is conducive to the smooth development of the subsequent detection of the metal content of flue gas and other related detection work in the settling furnace 1 and the guarantee of data accuracy.

[0021] Further, in order to further simulate the actual operation of the layer combustion furnace or the pulverized coal furnace industrial boiler and improve the detection effect of the entire system, in another embodiment, the detection system further comprises a slagging rod 7. One end of the slagging rod 7 penetrates into the internal space of the settling furnace 1 along the radial direction of the settling furnace 1, and the coal powder after combustion in the settling furnace 1 will form contamination or slag on the surface of the slagging rod 7. The other end of the slagging rod 7 is connected with a water cooling loop, which can effectively take away the heat absorbed by the slagging rod 7 in the high-temperature environment, so as to prevent the temperature of the slagging rod 7 from exceeding the set value due to the heating of the electric heating rod 22, so that the slagging rod 7 can continuously operate and accurately reflect the related data in the long-term detection process. The operator can detect the alkali metal content of the contamination or slag formed on the surface of the slagging rod 7 after the slagging rod 7 is cooled, so as to supplement the conversion process of alkali metal in the coal combustion process.

[0022] Further, the settling furnace 1 is provided with an ash collecting hopper 12 at one end away from the coal powder bin 4 for collecting the coal ash and flue gas. The top of the separator 6 is connected with an induced draft fan 61, which can form a negative pressure environment inside the separator 6, so as to facilitate the flue gas in the settling furnace 1 to be smoothly drawn into the separator 6, and further flow along a predetermined path under the action of the induced draft fan 61, so as to ensure that the gas flow in the whole system has good directionality and stability. The bottom of the separator 6 is connected with the solid phase detector 5, and the solid phase part (mainly coal ash) after the separation of the separator 6 is guided to the solid phase detector 5. The solid phase detector 5 can thus accurately detect and analyze the metal content in the coal ash, so as to provide key data support for comprehensively mastering the conversion of alkali metals in coal-fired power generation, guarantee the functional integrity of the whole detection system and the reliability of the detection results, and provide a strong basis for related research and process optimization.

[0023] In summary, the utility model discloses a settling furnace is arranged to simulate the internal environment of the layer combustion furnace or the coal powder furnace industrial boiler, and the products of each stage after the combustion of the coal powder in the coal powder bin entering the settling furnace are received and detected by the gas phase detector and the solid phase detector respectively, so as to track the conversion process of the alkali metals in each stage of the combustion of the coal powder.

[0024] The specific embodiments of the utility model have been described above. Other embodiments are within the scope of the appended claims.

[0025] The terms "exemplary", "example", and the like are used as adjectives to mean "serving as an example, instance, or illustration", with no implication that any feature is "preferred" or "advantageous" over other examples or embodiments. Specific embodiments have been described in detail herein. However, the techniques are not limited to the specific embodiments described herein, but include any and all implementations that are within the scope of the appended claims. In some instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to facilitate a description of the present techniques.

[0026] The above describes the optional implementation of the embodiments of the utility model in detail in combination with the drawings, but the embodiments of the utility model are not limited to the specific details in the above implementation, and various simple modifications can be made to the technical scheme of the embodiments of the utility model within the technical concept scope of the embodiments of the utility model, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0027] The above description of the present disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other variations without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the examples described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection system for alkali conversion in coal-fired power generation, characterized by, It includes: The settling furnace (1), heating device (2), gas detector (3), coal powder bin (4), solid phase detector (5) and separator (6), one end of the settling furnace (1) is communicated with the coal powder bin (4), the other side of the settling furnace (1) is connected with the separator (6); The heating device (2) is arranged on the furnace wall of the settling furnace (1) along the axial direction of the settling furnace (1), the gas phase detector (3) is fixedly arranged at one end of the settling furnace (1) close to the coal powder bin (4); The solid phase detector (5) is communicated with the settling furnace (1) through the separator (6); When the heating device (2) is started, the gas phase detector (3) detects the metal content of the flue gas in the settling furnace (1), and the solid phase detector (5) detects the metal content of the fly ash in the settling furnace (1).

2. A detection system for alkali conversion in coal-fired power generation according to claim 1, characterized in that, The detection system further comprises a slagging rod (7); one end of the slagging rod (7) penetrates into the settling furnace (1) along the radial direction of the settling furnace (1), and the other end of the slagging rod (7) is connected with a water cooling loop (71).

3. A detection system for alkali conversion in coal-fired power generation according to claim 2, characterized in that, The end of the settling furnace (1) away from the coal powder bin (4) is provided with an ash collecting hopper (12), and the ash collecting hopper (12) is connected with the separator (6) to discharge the fly ash and flue gas in the settling furnace (1).

4. A detection system for alkali conversion in coal-fired power generation according to claim 3, characterized in that, The top of the separator (6) is connected with an induced draft fan (61), and the bottom of the separator (6) is connected with the solid phase detector (5).

5. A detection system for alkali conversion in coal-fired power generation according to claim 4, characterized in that, The detection system further comprises a guide pipe (8) and a blower (9); one end of the guide pipe (8) is bent and connected with the end of the settling furnace (1), and the other end of the guide pipe (8) is connected with the blower (9); The output end of the coal powder bin (4) is communicated with the guide pipe (8).

6. A detection system for alkali conversion in coal-fired power generation according to claim 4, characterized in that, The heating device (2) includes a plurality of electric heating rods (22) connected with an electric heating cabinet (21), each electric heating rod (22) is fixedly arranged on the inner wall of the settling furnace (1), and each electric heating rod (22) is located below the gas phase detector (3).

7. A detection system for alkali conversion in coal-fired power generation according to claim 6, characterized in that, The inner wall of the settling furnace (1) is provided with a heat preservation layer (11), and each electric heating rod (22) penetrates through the heat preservation layer (11).

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