A high-moisture lignite pre-drying device integrated in a thermal power plant

Abstract

The present invention provides a high-moisture lignite pre-drying device integrated into a thermal power plant, comprising a rotary mechanism equipped with a reducer and a discharge bin movably mounted on the outer side of one end of the rotary mechanism. The high-moisture lignite pre-drying device integrated into a thermal power plant, by arranging baffles on both sides of a scraper, enables the scraper to roll the high-moisture lignite located in the lower half of the inner side of an inner drum, and the baffles can prevent the high-moisture lignite from flowing toward the two sides of the scraper. Then, the scraper can transfer more high-moisture lignite to a higher position for sliding, thereby preventing excessive accumulation of high-moisture lignite in the lower half of the inner drum, allowing the high-moisture lignite to fully contact with steam, thereby improving the drying effect of the device on the high-moisture lignite, and the baffles are tilted at a certain angle to reduce the resistance to the high-moisture lignite, allowing the high-moisture lignite located in the lower half of the inner drum to flow normally with the rotation of the inner drum.

Description

Technical Field

[0001] The invention relates to the technical field of lignite predrying, and in particular discloses high-moisture lignite predrying equipment integrated in a thermal power plant. Background Art

[0002] Lignite is a mineral coal with a relatively low degree of coalification. It is not easy to transport over long distances, difficult to store, easily volatile and prone to chemical reactions. It is mainly suitable for fields such as chemical industry and power plant combustion. Lignite is used for combustion in power plants, and it is prone to spontaneous combustion when stored in coal mines for a long time. Usually, water spraying is used to adjust the humidity to prevent it from spontaneous combustion. However, when the lignite after water spraying is burned in the boiler, on the one hand, it will increase the flue gas in the boiler, aggravate heat loss, and lead to a decrease in boiler efficiency. On the other hand, the moisture in the lignite will lead to the increase in the output of the induced draft fan and the pulverizing system of the power generation system, which will increase the power consumption of the power plant. Therefore, the use of lignite pre-drying technology in power stations plays an extremely important role in enhancing the overall economic benefits of power stations.

[0003] When using a steam rotary drying device to dry high-moisture lignite, the high-moisture lignite from the coal hopper is first transported to the hopper through a belt conveyor, and then transported to the drum through a spiral feeder in the hopper. At this time, driven by the blower, the steam generated by the heat source is introduced into the drum from the discharge end of the drum. The rotation of the drum makes the high-moisture lignite fully contact with the steam, and then the moisture in the high-moisture lignite is continuously evaporated to achieve the drying of the high-moisture lignite. When the airflow in the drum flows to the discharge end, it is introduced into the cyclone separator and the dust collector in turn through the exhaust pipe to treat the moisture and dust particles contained in the airflow. The treated airflow is discharged from the induced draft fan.

[0004] When the existing steam rotary drying device uses steam to dry the high-moisture lignite in the drum, part of the steam will be discharged directly from the upper half of the inner side of the drum along with the air flow during the process of steam flowing with the air flow. This will result in steam waste and fail to achieve effective utilization of steam resources. At the same time, due to the large inner diameter of the drum, the high-moisture lignite is mostly located in the lower half of the inner side of the drum during the process of the drum rolling the high-moisture lignite through rotation. Therefore, the device cannot effectively roll the high-moisture lignite, resulting in poor drying effect of the device on the high-moisture lignite. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a high-moisture lignite pre-drying equipment integrated in a thermal power plant, comprising a rotary mechanism equipped with a reducer, a discharge bin movably mounted on the outside of one end of the rotary mechanism, a feed bin movably mounted on the outside of the other end of the rotary mechanism, a heat source connected to one side of the discharge bin, a discharge port arranged at the bottom of the discharge bin, a hopper arranged on one side of the feed bin, a spiral feeder arranged inside the hopper and connected to one side of the feed bin, and an exhaust pipe arranged on the top of the feed bin, wherein a plurality of scrapers and guide mechanisms with staggered distribution are arranged on the inner side of the rotary mechanism.

[0006] Preferably, the rotating mechanism includes an outer drum mounted on the inner side of the discharge bin and the feed bin, the inner side of the outer drum is fixedly mounted with an inner drum via annular equidistantly distributed support bosses, and a heat insulation layer located on the outside of the support bosses is filled between the outer drum and the inner drum.

[0007] Preferably, the scrapers and the guide mechanisms are spaced apart.

[0008] Preferably, baffles are provided on both sides of the scraper, and the baffles and the scraper are inclined at a certain angle.

[0009] Preferably, the guide mechanisms are arranged in groups of six and are equidistantly distributed in a ring shape, and each group is staggered.

[0010] Preferably, the guide mechanism includes a support plate arranged on the inner side of the inner drum, the inner side of the top end of the support plate is rotatably connected to the guide plate through a fixed pin, a lower limit rod located on one side of the support plate is provided on one side of the bottom of the guide plate, and an upper limit rod located on one side of the support plate is provided on one side of the top of the guide plate.

[0011] Preferably, the bottom surface of the guide plate is configured as a symmetrically distributed inclined surface.

[0012] Preferably, a blower with adjustable wind speed is provided inside the heat source, and the steam generated by the heat source has a low oxygen content. Beneficial effects

[0013] 1. The high-moisture lignite pre-drying equipment integrated in the thermal power plant uses a support plate, a fixed pin, a lower limit rod and an upper limit rod in coordination, so that the guide plate located in the upper half of the inner side of the inner drum can rotate around the fixed pin under the action of its own gravity. At this time, when the steam flows to the upper half along the inner side of the inner drum with the airflow, the upper limit rod can block the airflow and slow down the flow speed of the airflow, so that the steam stays in the inner drum for a longer time, and then the steam can effectively heat the high-moisture lignite. The guide plate can be tilted at a certain angle under the limiting support of the upper limit rod. During the flow, the steam can be guided by the guide plate, so that it flows to the lower half of the inner drum and contacts the high-moisture lignite located in the lower half of the inner drum, thereby reducing the loss of steam and realizing the effective utilization of steam resources.

[0014] 2. The high-moisture lignite pre-drying equipment integrated in the thermal power plant sets baffles on both sides of the scraper so that when the scraper rolls the high-moisture lignite located in the lower half of the inner side of the inner drum, the baffles can prevent the high-moisture lignite from flowing to the sides of the scraper, and then the scraper can transfer more high-moisture lignite to a higher position for sliding, thereby avoiding excessive accumulation of high-moisture lignite in the lower half of the inner drum, so that the high-moisture lignite can fully contact with the steam, and the drying effect of the device on the high-moisture lignite is improved. The baffle is tilted at a certain angle to reduce the resistance to the high-moisture lignite, so that the high-moisture lignite located in the lower half of the inner drum can flow normally with the rotation of the inner drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the rotary mechanism of the present invention;

[0018] Figure 3 It is a side sectional view of the rotary mechanism of the present invention;

[0019] Figure 4 is a schematic cross-sectional view of a scraper of the present invention;

[0020] Figure 5 Schematic diagram of the side distribution of the flow guide mechanism of the present invention;

[0021] Figure 6 Schematic diagram of the flow guide mechanism of the present invention;

[0022] Figure 7 It is a partial side view of the flow guide mechanism of the present invention.

[0023] In the figure: 1. Rotating mechanism; 1-1. Outer drum; 1-2. Support boss; 1-3. Inner drum; 1-4. Thermal insulation layer; 2. Discharge bin; 3. Feed bin; 4. Heat source; 5. Discharge port; 6. Hopper; 7. Screw feeder; 8. Exhaust pipe; 9. Scraper; 10. Guide mechanism; 101. Support plate; 102. Fixing pin; 103. Guide plate; 104. Lower limit rod; 105. Upper limit rod; 11. Baffle; 12. Inclined surface. Implementation Method

[0024] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0025] The drawings in the embodiments of the present invention: Different types of section lines in the drawings are not marked according to national standards, nor do they impose any requirements on the materials of the components. Instead, they are used to distinguish the cross-sectional views of the components in the drawings.

[0026] See also Figure 1-7 The material conveying device of the present invention is a kind of material conveying device of the present invention, which is integrated into a thermal power plant and has a high-moisture lignite pre-drying equipment. The material conveying device comprises a rotary mechanism 1 equipped with a reducer, a discharge bin 2 movably mounted on the outside of one end of the rotary mechanism 1, a feed bin 3 movably mounted on the outside of the other end of the rotary mechanism 1, a heat source 4 connected to one side of the discharge bin 2, a discharge port 5 arranged at the bottom of the discharge bin 2, a hopper 6 arranged on one side of the feed bin 3, a spiral feeder 7 arranged inside the hopper 6 and connected to one side of the feed bin 3, and an exhaust pipe 8 arranged on the top of the feed bin 3. The exhaust pipe 8 can be used to introduce the internal air flow of the inner drum 1-3 into the cyclone separator and the dust collector in turn to filter the moisture and dust particles contained in the air flow. The treated air flow is discharged from the induced draft fan, thereby ensuring that the steam air flow can flow smoothly on the inner side of the inner drum 1-3, so as to discharge the moisture-containing air flow outwardly through the exhaust pipe 8. The inner side of the rotary mechanism 1 is provided with a plurality of scrapers 9 and a guide mechanism 10 with staggered distribution.

[0027] Among them, the rotating mechanism 1 includes an outer drum 1-1 which is mounted on the inner side of the discharge bin 2 and the feed bin 3. The inner side of the outer drum 1-1 is fixedly mounted with an inner drum 1-3 through annular support bosses 1-2 which are evenly distributed. The support bosses 1-2 can be used to isolate the outer drum 1-1 and the inner drum 1-3 to avoid direct contact between the two, so that the heat of the inner drum 1-3 is not easily conducted and dissipated to the outer drum 1-1. A heat insulation layer 1-4 located on the outside of the support bosses 1-2 is filled between the outer drum 1-1 and the inner drum 1-3. The heat insulation layer 1-4 can be used to protect the inner drum 1-3 and reduce its heat loss, thereby ensuring that the inner side of the inner drum 1-3 has a higher temperature, which makes it easy to evaporate the moisture in the high-moisture lignite.

[0028] Among them, the scraper 9 and the guide mechanism 10 are spaced apart. By arranging the scraper 9 and the guide mechanism 10 in a spaced apart manner, the resistance to the high-moisture lignite located inside the inner drum 1-3 can be reduced, so that the high-moisture lignite can flow in the lower half of the inner drum 1-3. At the same time, it can be ensured that each small section inside the inner drum 1-3 is provided with a scraper 9 and a guide mechanism 10, so that each small section of the inner drum 1-3 can roll the high-moisture lignite through the scraper 9 and guide the steam airflow through the guide mechanism 10.

[0029] Baffles 11 are provided on both sides of the scraper 9 , and the baffles 11 and the scraper 9 are inclined at a certain angle.

[0030] The guide mechanisms 10 are distributed in a circular pattern in groups of six at equal intervals, and are staggered between groups. The six guide mechanisms 10 ensure that the upper half of the inner drum 1-3 always has a guide mechanism 10 to guide the steam flow during its rotation.

[0031] Among them, the guide mechanism 10 includes a support plate 101 arranged on the inner side of the inner drum 1-3, and the inner side of the top of the support plate 101 is rotatably connected to the guide plate 103 through a fixing pin 102, and a lower limit rod 104 located on the side of the support plate 101 is provided on one side of the bottom of the guide plate 103, and an upper limit rod 105 located on the side of the support plate 101 is provided on one side of the top of the guide plate 103.

[0032] Among them, the bottom surface of the guide plate 103 is set as a symmetrically distributed inclined surface 12. The inclined surface 12 can reduce the resistance between the guide plate 103 and the high-moisture lignite. Even if the guide plate 103 located in the lower half of the inner drum 1-3 is tilted under the squeezing of the high-moisture lignite, the high-moisture lignite can still flow along the inclined surface 12.

[0033] Among them, the interior of the heat source 4 is provided with a blower with adjustable wind speed. The blower can transport the oxygen-free steam generated by the heat source 4 to the inner side of the inner drum 1-3, and then heat the high-moisture lignite by the steam to evaporate the moisture inside it. The steam generated by the heat source 4 has a low oxygen content, which ensures that the high-moisture lignite will not spontaneously combust due to heat during the drying process of the high-moisture lignite, thereby protecting the dried lignite.

[0034] When the drying equipment is working, the high-moisture lignite in the coal hopper is first transported to the hopper 6 through the belt conveyor, and the high-moisture lignite is transported to the inner drum 1-3 through the spiral feeder 7 in the hopper 6. At this time, under the drive of the blower, the steam generated by the heat source 4 is introduced into the inner drum 1-3 from the discharge bin 2 of the rotary mechanism 1. The high-moisture lignite is continuously stirred and rolled by the scraper 9 through the rotation of the inner drum 1-3. At this time, when the steam flows to the upper half of the inner drum 1-3 along with the air flow, the upper limit rod 105 can block and guide the air flow, slow down the flow speed of the air flow, and make it flow to the lower half of the inner drum 1-3. , so that the steam is in full contact with the high-moisture lignite inside the inner drum 1-3, and then the steam can effectively heat the high-moisture lignite, and the moisture in the high-moisture lignite is continuously evaporated, thereby achieving the drying of the high-moisture lignite. When the airflow in the drum flows to the feed bin 3, it is successively introduced into the cyclone separator and the dust collector through the exhaust pipe 8 to process the moisture and dust particles contained in the airflow. The treated airflow is discharged from the induced draft fan, and at the same time, the dried lignite is gradually transported to the discharge bin 2 under the rotation of the rotary mechanism 1, and discharged to the outside through the discharge port 5. The content not described in detail in this specification belongs to the existing technology well known to professional and technical personnel in this field.

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A high-moisture brown coal pre-drying device integrated in a thermal power plant, comprising a rotary mechanism (1) equipped with a reducer, a discharge bin (2) mounted on the outside of one end of the rotary mechanism (1), a feed bin (3) mounted on the outside of the other end of the rotary mechanism (1), a heat source (4) connected to one side of the discharge bin (2), a discharge port (5) arranged at the bottom of the discharge bin (2), a hopper (6) arranged on one side of the feed bin (3), a screw feeder (7) arranged inside the hopper (6) and connected to one side of the feed bin (3), and an exhaust pipe (8) arranged at the top of the feed bin (3), characterized in that: The inner side of the rotary mechanism (1) is provided with a plurality of scrapers (9) and a plurality of flow guide mechanisms (10), and the scrapers (9) and the flow guide mechanisms (10) are spaced apart. The rotary mechanism (1) comprises an outer roller (1-1) which is sleeved on the inner side of a discharge bin (2) and a feed bin (3), and an inner roller (1-3) is sleeved on the inner side of the outer roller (1-1) via annular support bosses (1-2) which are equidistantly distributed. A heat insulation layer (1-2) located on the outer side of the support bosses (1-2) is filled between the outer roller (1-1) and the inner roller (1-3). -4), the guide mechanism (10) comprises a support plate (101) arranged on the inner side of the inner drum (1-3), the inner side of the top end of the support plate (101) is rotatably connected to a guide plate (103) via a fixing pin (102), a lower limit rod (104) located on one side of the support plate (101) is provided on one side of the bottom of the guide plate (103), and an upper limit rod (105) located on one side of the support plate (101) is provided on one side of the top of the guide plate (103), and the bottom surface of the guide plate (103) is provided as a symmetrically distributed inclined surface (12).

2. The high-moisture lignite pre-drying equipment integrated in a thermal power plant according to claim 1, characterized in that: Baffles (11) are provided on both sides of the scraper (9), and the baffles (11) and the scraper (9) are inclined at a certain angle.

3. The high-moisture lignite pre-drying equipment integrated in a thermal power plant according to claim 1, characterized in that: The flow guiding mechanisms (10) are distributed in a circular manner with equal spacing in groups of six, and staggered distribution is performed between each group.

4. The high-moisture lignite pre-drying equipment integrated in a thermal power plant according to claim 1, characterized in that: A blower with adjustable wind speed is provided inside the heat source (4).

Images