A fluxing agent addition system

Abstract

The utility model relates to a kind of fluxing agent adding systems, including first storage bin, flour mill, powder storage, sending pump, second storage bin and coal mill, the discharge outlet of first storage bin is connected with the inlet of flour mill;The first air pipe is communicated with the side of flour mill;The inlet of flour mill is connected with powder storage;The discharge outlet of powder storage is connected with sending pump;The discharge outlet of sending pump is connected with second material conveying pipe;The discharge outlet of second storage bin is connected with coal mill;Second material conveying pipe is connected with third drop tube.The utility model passes through the dry, grinding of the blocky fluxing agent into flour mill, fluxing agent powder enters into sending pump, by the way of pneumatic conveying, is sent to inside coal system, by this way, fluxing agent powder can be mixed with raw coal in third drop tube after entering into coal mill and grinding, mixed is more fully, after grinding in coal mill, pulverized coal particle and fluxing agent particle are fully mixed.

Description

Technical Field

[0001] This utility model belongs to the field of coal gasification technology, and specifically relates to a fluxing agent addition system. Background Technology

[0002] Coal gasification technology is one of the core means to achieve clean and efficient utilization of coal. Its essence is to convert elements such as carbon and hydrogen in coal into syngas (CO + H2) through a high-temperature reaction. However, the characteristics of coal ash, especially the ash fusion point, directly determine the stability of the gasification process, equipment lifespan, and economic efficiency. The ash fusion point is usually determined by the ash cone method, including the deformation temperature (DT), softening temperature (ST), hemispherical temperature (HT), and flow temperature (FT). Its value is closely related to the composition ratio of mineral components (such as SiO2, Al2O3, Fe2O3, CaO, etc.) in the coal ash. Some regions contain large quantities of high ash fusion point coal (FT > 1500℃), whose ash composition generally accounts for more than 75% of the SiO2 + Al2O3 content, even reaching as high as 85%. High ash fusion point coal requires the addition of flux to lower the ash fusion point and improve gasification performance. Traditional flux addition involves manually mixing the flux with the raw coal, which is not conducive to precision control and mechanization / automation. Utility Model Content

[0003] The purpose of this invention is to provide a flux addition system that can improve the accuracy of flux addition, increase the premixing effect between flux and pulverized coal, reduce energy consumption, reduce equipment and operational risks, and improve quality and efficiency.

[0004] To achieve the above objectives, the present invention employs a fluxing agent addition system, comprising a first storage silo, a grinding mill, a powder storage silo, a delivery pump, a second storage silo, and a coal mill.

[0005] The discharge port of the first storage silo is connected to the inlet of the grinding mill through a first discharge pipe, wherein a first weighing conveyor is provided between the discharge port of the first storage silo and the first discharge pipe; a first air inlet pipe is connected to one side of the grinding mill, and a first conveying pipe is provided at the top of the grinding mill.

[0006] The grinding mill is connected to the inlet of the powder storage silo via a first conveying pipe; the outlet of the powder storage silo is connected to the sending pump via a second discharge pipe; the outlet of the sending pump is connected to the second conveying pipe.

[0007] The discharge port of the second storage silo is connected to the coal mill through the third discharge pipe, wherein a second weighing conveyor is provided between the discharge port of the second storage silo and the third discharge pipe; the first conveying pipe is connected to the third discharge pipe; a second air inlet pipe is connected to one side of the coal mill, and a discharge pipe is provided at the top of the coal mill.

[0008] Preferably, the top of the powder storage bin is connected to a first feed pipe.

[0009] Preferably, both the grinding mill and the coal mill are equipped with a classifier.

[0010] Preferably, both the grinding mill and the coal mill are provided with a discharge port at the bottom; the discharge port is provided with a valve.

[0011] Preferably, a third conveying pipe is connected to one side of the first discharge pipe; the end of the third conveying pipe away from the first discharge pipe is connected to the third discharge pipe; a control valve is installed on the first discharge pipe below the third conveying pipe.

[0012] Preferably, both sides of the first storage bin, the powder storage bin, and the second storage bin are equipped with weighing and metering modules, which are used to detect the weight of the materials in the first storage bin, the powder storage bin, and the second storage bin, respectively.

[0013] Preferably, filters are installed on the top of the first storage silo, the powder storage silo, and the second storage silo.

[0014] This invention first transports the block-shaped flux to a flux storage silo for storage. Then, after being weighed by a weighing and metering module and a weighing conveyor, it falls into a grinding mill for drying and grinding. After being screened by a classifier, the flux powder with qualified particle size is transported to a powder storage silo through a first conveying pipe. The flux powder then enters a sending pump through a second discharge pipe at the bottom of the powder storage silo and is sent to the coal grinding system by pneumatic conveying. In this way, the flux powder can be mixed with raw coal in a third discharge pipe before entering the coal mill for grinding, resulting in more thorough mixing. After grinding in the coal mill, the pulverized coal particles and flux particles are fully mixed, and the qualified pulverized coal particles and flux particles enter the next process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] As shown in the figure, a flux addition system includes a first storage silo 2, a grinding mill 7, a powder storage silo 21, a delivery pump 28, a second storage silo 34, and a coal mill 41.

[0019] The discharge port at the bottom of the first storage silo 2 is connected to the inlet of the grinding mill 7 through the first discharge pipe 6; the grinding mill 7 is connected to the first air inlet pipe 9 on one side, and the grinding mill 7 is provided with a first conveying pipe 12 at the top. The first storage silo 2 stores lumpy flux, which falls into the grinding mill 7 through the first discharge pipe 6. The grinding mill 7 grinds the flux, and most of the flux is ground into powder. An external air source introduces inert gas or hot inert gas into the grinding mill 7 through the first air inlet pipe 9. The ground flux is then transported to the first conveying pipe 12 by the airflow. Hot inert gas can be used to control the moisture content of the flux.

[0020] In this embodiment, a first weighing conveyor 4 is provided between the discharge port of the first storage bin 2 and the first discharge pipe 6. The blocky flux in the first storage bin 2 falls onto the first weighing conveyor 4, and is weighed and transported into the first discharge pipe 6 at the same time. The speed at which the blocky flux enters the grinding mill 7 can be controlled by the first weighing conveyor 4.

[0021] The grinding mill 7 is connected to the inlet of the powder storage silo 21 via a first conveying pipe 12; the outlet of the powder storage silo 21 is connected to a sending pump 28 via a second discharge pipe 25, wherein the sending pump 28 is a pneumatic pump, and a conveying valve 26 is installed on the second discharge pipe 25 to control the discharge speed of the powdered flux; the outlet of the sending pump 28 is connected to a second conveying pipe 31, and the powdered flux enters the powder storage silo 21 through the first conveying pipe 12, and the powder in the powder storage silo 21 is discharged through the powder storage silo 31. The second discharge pipe 25 at the bottom of 21 enters the sending pump 28. The side of the pump body of the sending pump 28 is provided with a gas inlet, which is connected to an external gas source. The external gas source inputs gas into the sending pump 28. The gas transports the flux powder over a long distance in the pipeline by pneumatic conveying and increases the pressure of the solid powder, and delivers it to the second conveying pipe 31. The second conveying pipe 31 is equipped with a regulating valve 29 and a flow meter 30. By controlling the opening of the regulating valve 29, the conveying density and speed are adjusted.

[0022] In this embodiment, the top of the powder storage bin 21 is connected to a first feed pipe 24, through which other types or the same type of flux powder can be directly added to the powder storage bin 21.

[0023] The discharge port at the bottom of the second storage bin 34 is connected to the coal mill 41 through the third discharge pipe 37; the second conveying pipe 31 is connected to the third discharge pipe 37. The second storage bin 34 stores raw coal / coke. The raw coal / coke falls into the third discharge pipe 37. At this time, the flux powder conveyed by pneumatic conveying enters the third discharge pipe 37 through the second conveying pipe 31. The raw coal / coke and flux are initially mixed in the third discharge pipe 37 and then fall into the coal mill 41.

[0024] In this embodiment, a second weighing conveyor 36 is provided between the discharge port of the second storage bin 34 and the third discharge pipe 37. The raw coal / coke in the second storage bin 34 falls onto the second weighing conveyor 36, is weighed and conveyed into the third discharge pipe 37 at the same time, and the speed at which the raw coal / coke enters the coal mill 41 can be controlled by the second weighing conveyor 36.

[0025] The coal mill 41 is connected to a second air inlet pipe 38 on one side, and a discharge pipe 40 is provided at the top of the coal mill 41. An external air source introduces hot inert gas into the coal mill 41 through the second air inlet pipe 38. After the raw coal / coke and flux powder are mixed, they are fully dried and ground in the coal mill 41 by contact with the hot inert gas. The pulverized coal particles and flux particles are fully mixed and transported by the hot inert gas to the discharge pipe 40 for separation by a bag filter. Qualified particles enter the next process, and unqualified particles are re-ground.

[0026] In this embodiment, both the grinding mill 7 and the coal mill 41 are equipped with a classifier 8. The particle size of the flux powder and mixed particles can be adjusted by adjusting the rotation speed of the classifier 8. In the grinding mill 7 or the coal mill 41, each particle is simultaneously subjected to the centrifugal force of the rotation of the classifier 8 and the upward force of the inert gas flow. When the particle is larger than the set value, the particle is thrown against the wall of the grinding mill 7 or the coal mill 41 and continues to be ground. When the particle is ground to a certain extent, the particle is sent out of the discharge port by the inert gas flow.

[0027] In this embodiment, both the grinding mill 7 and the coal mill 41 are provided with discharge ports 10 and 39 at their bottoms. Valves are provided on the discharge ports 10 and 39. A small amount of impurities and unground flux remaining inside the grinding mill 7 are periodically discharged through the discharge port 10 of the grinding mill 7. A small amount of impurities remaining inside the coal mill 41 are periodically discharged through the discharge port 39 of the coal mill 41.

[0028] Example 2

[0029] A third conveying pipe 5 is connected to one side of the first discharge pipe 6; the end of the third conveying pipe 5 away from the first discharge pipe 6 is connected to the third discharge pipe 37; a control valve is installed on the first discharge pipe 6 below the third conveying pipe 5. When the grindability index of the raw coal / coke and the flux differs greatly, the control valve is opened, and the flux falls from the first discharge pipe 6 into the grinding mill 7. The flux is first ground and then mixed with the raw coal / coke before entering the coal mill 41 for further grinding. When the grindability indexes of the two are not significantly correlated, the control valve is closed, and the flux, after being metered, enters the third conveying pipe 5 and mixes with the raw coal / coke in the third discharge pipe 37 before entering the coal mill 41 for grinding. Other features are the same as in Example 1.

[0030] Example 3

[0031] Weighing modules 3, 22, and 35 are installed on both sides of the first storage silo 2, powder storage silo 21, and second storage silo 34, respectively. These modules detect the weight of the materials within each silo. Supports are fixed to both sides of each silo, with the weighing modules 3, 22, and 35 positioned below them. The weighing modules 3, 22, and 35 are fixed to an external support frame. The first storage silo 2, powder storage silo 21, and second storage silo 34 are connected by these supports. The weights are pressed onto the corresponding weighing and metering modules 3, 22, and 35. The weighing and metering modules 3, 22, and 35 detect the weights of the first storage bin 2, the powder storage bin 21, and the second storage bin 34, respectively, to obtain the weights of the block flux, the powder flux, and the raw coal / coke. The weighing and metering modules 3, 22, and 35 of the first storage bin 2 and the second storage bin 34 can be cross-checked with the detection values ​​of the first weighing conveyor 4 and the second weighing conveyor 36, so as to accurately control the amount of material entering the grinding mill 7 and the coal mill 41. Other features are the same as in Example 1.

[0032] Example 4

[0033] The tops of the first storage silo 2, the powder storage silo 21, and the second storage silo 34 are all equipped with filters 11, 23, and 33. The tops of the first storage silo 2 and the second storage silo 34 are connected to second feed pipes 1 and 32, through which block flux and raw coal / coke are transported into the first storage silo 2 and the second storage silo 34. The filters 11, 23, and 33 use negative pressure to draw in fly ash generated by the material entering the powder storage silo 21, the first storage silo 2, or the second storage silo 34. Other features are the same as in Example 1.

[0034] The method of using this utility model is as follows: Lump flux and raw coal / coke are respectively transported to the first storage silo 2 and the second storage silo 34 for storage. The lump flux falls onto the first weighing conveyor 4 for weighing and is then transported to the first discharge pipe 6, falling into the grinding mill 7 for drying and grinding. After being screened by the classifier 8, flux powder of qualified particle size is transported to the powder storage silo 21 by airflow. The flux powder enters the sending pump 28 through the second discharge pipe 25 at the bottom of the powder storage silo 21 and is transported to the third discharge pipe 37 by pneumatic conveying. The raw coal / coke and flux powder are mixed in the third discharge pipe 37 and then fall into the coal mill 41. After grinding in the coal mill 41, the pulverized coal particles and flux particles are fully mixed, and the qualified pulverized coal particles and flux particles enter the next process.

Claims

1. A flux addition system, characterized in that, It includes a first storage silo (2), a grinding mill (7), a powder storage silo (21), a sending pump (28), a second storage silo (34), and a coal mill (41). The discharge port of the first storage bin (2) is connected to the inlet of the grinding mill (7) through the first discharge pipe (6); the grinding mill (7) is connected to the first air inlet pipe (9) on one side, and the grinding mill (7) is provided with a first conveying pipe (12) at the top. The grinding mill (7) is connected to the inlet of the powder storage bin (21) via the first conveying pipe (12); the outlet of the powder storage bin (21) is connected to the sending pump (28) via the second discharge pipe (25); the outlet of the sending pump (28) is connected to the second conveying pipe (31). The discharge port of the second storage bin (34) is connected to the coal mill (41) through the third discharge pipe (37); the second conveying pipe (31) is connected to the third discharge pipe (37); the coal mill (41) is connected to a second air inlet pipe (38) on one side, and the coal mill (41) is provided with a discharge pipe (40) at the top.

2. The flux addition system according to claim 1, characterized in that, The top of the powder storage bin (21) is connected to the first feed pipe (24).

3. The flux addition system according to claim 1, characterized in that, Both the grinding mill (7) and the coal mill (41) are equipped with a classifier (8).

4. The flux addition system according to claim 1, characterized in that, Both the grinding mill (7) and the coal mill (41) are equipped with discharge ports (10, 39) at the bottom; valves are provided on the discharge ports (10, 39).

5. The flux addition system according to claim 1, characterized in that, The first discharge pipe (6) is connected to a third conveying pipe (5) on one side; the end of the third conveying pipe (5) away from the first discharge pipe (6) is connected to the third discharge pipe (37); a control valve is installed on the first discharge pipe (6) below the third conveying pipe (5).

6. The flux addition system according to claim 1, characterized in that, Weighing and metering modules (3, 22, 35) are provided on both sides of the first storage bin (2), the powder storage bin (21), and the second storage bin (34). The weight of the materials in the first storage bin (2), the powder storage bin (21), and the second storage bin (34) are detected by the weighing and metering modules (3, 22, 35).

7. The flux addition system according to claim 1, characterized in that, The first storage bin (2), the powder storage bin (21), and the second storage bin (34) are all equipped with filters (11, 23, 33) on their tops.

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