Dechlorination jigging equipment and process for coal dressing

Abstract

The invention relates to the technical field of coal dressing, and provides a dechlorination jigging device and process for coal dressing, and the dechlorination jigging device and process comprises the following steps: S1, pretreatment: immersing high-chlorine raw coal in water for conveying; s2, jigging separation: the raw coal is subjected to jigging separation, in a frequency period, the rest period accounts for 30%-50% of the whole frequency period, and coal products and gangue are obtained after separation; s3, conveying and dehydration: spraying water is added when the coal product subjected to jigging separation is conveyed, after spraying is completed, the coal product is dehydrated, dechlorination of the coal product is completed, and a dechlorinated coal product is obtained; and S4, desulfurization: carrying out desulfurization treatment on the dechlorinated coal product to obtain a final refined product. By means of the technical scheme, the problem that chlorine elements in raw coal are inconvenient to efficiently remove through a coal dressing process in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal preparation, and in particular to a chlorine removal jigging device and process for coal preparation. Background Art

[0002] In the process of coal mining and utilization, the chlorine element contained in the raw coal will cause many problems. On the one hand, when coal is burned, chlorine will be converted into harmful gases such as hydrogen chloride, which will pollute the environment and corrode the combustion equipment and subsequent flue gas treatment facilities; on the other hand, in the deep processing of coal, chlorine will also affect the product quality and the stability of the production process. Traditional coal preparation processes often have limited effects in removing chlorine and are difficult to meet the increasingly stringent environmental protection and quality requirements. Therefore, it is of great practical significance to develop an efficient coal preparation dechlorination jigging equipment and process. Summary of the invention

[0003] The present invention provides a chlorine removal jigging device and process for coal preparation, which solves the problem that the existing coal preparation process in the related art is inconvenient to efficiently remove the chlorine element in the raw coal.

[0004] The technical solution of the present invention is as follows: A dechlorination process for coal preparation comprises the following steps: S1. Pretreatment: transport high-chloride raw coal immersed in water; S2. Jigging separation: The raw coal is subjected to jigging separation. Within a frequency cycle, the rest period accounts for 30%-50% of the entire frequency cycle. Coal products and gangue are obtained after separation. S3, transportation and dehydration: spray water during transportation of coal products after jigging and sorting. After spraying, the coal products are dehydrated to complete the dechlorination of the coal products and obtain dechlorinated coal products; S4. Desulfurization: The dechlorinated coal product is desulfurized to obtain the final refined product.

[0005] Optionally, in step S2, one frequency cycle includes an intake period, an expansion period, an exhaust period, and a rest period, so that the time of one frequency cycle is 100, then the exhaust period = the intake period - 3.

[0006] Optionally, 3. A chlorine removal process for coal preparation according to claim 1, characterized in that the frequency of the jigging separation in step S2 is 0.15 Hz-0.5 Hz.

[0007] Optionally, in the step S2, during jigging separation, the air is introduced at least twice, and in the step S1, a scraper feeder is used for conveying the raw coal, and the scraper of the scraper feeder is immersed in water.

[0008] The present invention also provides a chlorine removal jigging equipment for coal preparation, comprising: a jig body having an inlet and an outlet; A screen plate is swingably arranged on the jig body, the screen plate divides the jig body into a jig chamber and a screening chamber, and after the screen plate swings, the height of the bottom of the screening chamber near the inlet side is lower than or higher than the height near the outlet side.

[0009] A chlorine removal jigging device for coal preparation, wherein the angle between the screen plate and the horizontal plane after the screen plate swings is greater than or equal to -5° and less than or equal to 5°.

[0010] Optionally, the lower surfaces of both ends of the sieve plate have push surfaces, and further include A push rod, wherein the push rod is slidably arranged on the jig body, and the push rod has a first push slope and a second push slope, and the heights of the first push slope and the second push slope gradually decrease from one end close to each other to the two ends of the push rod, and the first push slope and the second push slope are respectively in contact with the two push surfaces.

[0011] Optionally, the jig machine body has a first mounting port and a second mounting port, the first mounting port is located at one end of the jig chamber close to the inlet, the second mounting port is located at one end of the jig chamber close to the outlet, and both ends of the push rod are slidably disposed in the first mounting port and the second mounting port, respectively, and further includes A baffle, the baffle being slidably disposed at the first mounting opening, and the lower end of the baffle being in contact with the first push inclined surface; A first elastic member, two ends of which act on the jig body and the baffle respectively, and are used to provide a force for the baffle to approach the push rod.

[0012] Optionally, the side wall of the screening chamber close to the inlet has a stopper, one end of the stopper has a groove, and further includes A material guide plate is swingably arranged on the jig body, and two ends of the material guide plate are respectively in contact with the groove and the screen plate.

[0013] Optionally, the lower surfaces at both ends of the sieve plate have limiting grooves, and the pushing surface is located on the limiting grooves.

[0014] The working principle and beneficial effects of the present invention are: In the present invention, the chloride ions in the coal can be largely removed by the immersion pretreatment during the transportation of the raw coal and the setting and operation mode during the jigging and sorting process, such as extending the rest period, multiple air intakes, low-frequency jigging, etc. This can significantly reduce the chlorine content in the coal, improve the quality of the coal, and reduce the corrosion of the chlorine element to the equipment and the pollution to the environment during the combustion or subsequent processing of the coal.

[0015] Changing the control mode of the traditional jig, extending the rest period and reasonably adjusting the relationship between the air intake period, expansion period and exhaust period, and adopting low-frequency and multiple air intake methods, the efficiency and accuracy of jig separation are improved. This innovative parameter setting can better separate coal from gangue, and at the same time provide more favorable conditions for the precipitation of chloride ions in coal, making the entire coal preparation process more efficient and reasonable.

[0016] The raw coal is pre-treated by immersing it in water during transportation, and water is sprayed and dehydration is performed during the transportation of coal products. This not only increases the contact time between coal and water and promotes the precipitation of chloride ions, but also achieves preliminary cleaning and dehydration of the coal, simplifies the process flow, and reduces the burden of subsequent processing links.

[0017] This innovative raw coal dechlorination process provides a new technical idea and solution for the coal industry, which helps promote technological progress and industrial upgrading of the entire industry. It encourages enterprises to continuously develop and apply new technologies and processes, improve the utilization efficiency and quality of coal resources, and achieve sustainable development of the coal industry.

[0018] At the same time, through the innovative design of components such as the jig screen plate, such as the angle-adjustable screen plate structure, the equipment's adaptability to raw coal of different properties has been improved, and it can meet the production needs of different coal mining companies. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 4 It is a schematic diagram of the local structure of the present invention; Figure 5 It is another partial structural schematic diagram of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle; Figure 7 This is a schematic diagram of the push rod structure of the present invention; Figure 8 It is a schematic diagram of the sieve plate structure of the present invention; Fig. 9 For the present invention Figure 8 Enlarged structural diagram at point C in the middle.

[0021] In the figure: 1. jig machine body, 11. inlet, 12. outlet, 2. screen plate, 13. jig chamber, 14. screening chamber, 21. push surface, 3. push rod, 31. first push slope, 32. second push slope, 15. first mounting port, 16. second mounting port, 4. baffle, 5. first elastic member, 17. baffle, 171. groove, 6. guide plate, 22. limit groove. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0022] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0023] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] As the first embodiment of the present invention, a chlorine removal process for coal preparation is proposed, comprising the following steps: S1. Pretreatment: transport high-chloride raw coal immersed in water; S2. Jigging separation: The raw coal is subjected to jigging separation. Within a frequency cycle, the rest period accounts for 30%-50% of the entire frequency cycle. Coal products and gangue are obtained after separation. S3, transportation and dehydration: spray water during transportation of coal products after jigging and sorting. After spraying, the coal products are dehydrated to complete the dechlorination of the coal products and obtain dechlorinated coal products; S4. Desulfurization: The dechlorinated coal product is desulfurized to obtain the final refined product.

[0026] In this embodiment, the raw coal is first transported when dechlorinating, and the raw coal is immersed in water during transportation, so that the raw coal can fully contact with water during transportation. In this way, part of the soluble chloride salts in the raw coal can be initially dissolved in water, achieving preliminary chlorine removal pretreatment.

[0027] When using jigging equipment to sort raw coal, the rest period can be set to 40% of the entire cycle in a frequency cycle. For example, if the total time of a frequency cycle is 100 seconds, the rest period is 40 seconds. Although the coal preparation industry has always believed that a rest period of 10-15% of the entire cycle is most conducive to coal sorting, extending the rest period can greatly increase the contact time between coal and water, providing sufficient exchange time for the chlorine element in the coal to be exchanged into the water. Finally, the chlorine element in the coal is dissolved in the water and precipitated from the coal, achieving the purpose of removing the chlorine element in the coal and improving the quality of the coal.

[0028] The coal products after jigging and sorting are transported through a conveyor belt with a spray device. During the transportation process, the spray device is turned on to spray water evenly on the coal products. The flow rate and pressure of the spray water are reasonably adjusted according to the quantity and properties of the coal products to ensure that the coal products can fully contact with water. After spraying, the coal products are sent to dehydration equipment such as centrifugal dehydrators, filter presses or dehydration screens for dehydration. Through the dehydration operation, excess water in the coal products is removed, and the precipitation of chloride ions in the coal is further promoted, completing the dechlorination process of the coal products.

[0029] After dehydration, the coal product is subjected to a suitable desulfurization method, such as chemical desulfurization or physical desulfurization. For example, if the chemical desulfurization method is adopted, a specific desulfurizer can be used to react chemically with the sulfur element in the coal product to convert the sulfur into easily separable compounds. The dechlorinated coal product is mixed with the desulfurizer in a certain proportion, and the desulfurization reaction is carried out at a certain temperature and reaction time. After the reaction is completed, the generated sulfur-containing compounds are removed by filtering, washing and other operations to obtain the final refined product, that is, high-quality coal with low chlorine and low sulfur.

[0030] Further, in step S2, a frequency cycle includes an intake period, an expansion period, an exhaust period, and a rest period, so that the time of a frequency cycle is 100, then the exhaust period = the intake period - 3.

[0031] In this embodiment, within a frequency cycle, the rest period can be set to account for 40% of the entire cycle. For example, if the total time of a frequency cycle is 100 seconds, the intake period is set to 20 seconds, the expansion period is set to 23 seconds, the exhaust period is set to 17 seconds (exhaust period = intake period - 3, that is, 20 - 3 = 17 seconds), and the rest period is 40 seconds. By reasonably configuring the time within a cycle, the residence time of the raw coal in the jigging equipment is extended, so that the chlorine element is precipitated from the raw coal.

[0032] Furthermore, the frequency of the jigging separation in step S2 is 0.15 Hz -0.5 Hz.

[0033] Furthermore, in step S2, during jigging and separation, the air is introduced at least twice. In step S1, a scraper feeder is used for conveying the raw coal, and the scraper of the scraper feeder is immersed in water.

[0034] In this embodiment, the pretreated raw coal is sent to the jig for sorting. During the jig process, the frequency of the jig can be controlled to be 0.3Hz. Multiple air intake methods are adopted, for example, air intake is performed once at regular intervals, the number of air intakes is 3 times, and the air intake time for each time is reasonably set according to the actual situation to extend the floating time of the bed layer, so that the raw coal can be fully tumbled and sorted in the jig, improve the separation effect of coal and gangue, and create favorable conditions for the further precipitation of chloride ions in the coal. Coal products and gangue are obtained after sorting. Among them, an immersed scraper feeder is used to transport the raw coal before the jig is sorted, and the raw coal can be immersed in water during the transportation of the raw coal, and no additional pretreatment equipment is required. Through low frequency, the extended rest period is combined to extend the residence time of coal in the jig, thereby creating sufficient conditions for the precipitation of chlorine elements.

[0035] Through the optimized jig separation process, coal and gangue can be separated more effectively, the recovery rate of coal can be improved, and the waste of coal resources can be reduced. At the same time, the quality of coal after dechlorination and desulfurization treatment is improved, making it more valuable in the market, thereby improving the economic benefits of coal enterprises. The dechlorination process for coal preparation proposed in this embodiment uses jig equipment and other auxiliary equipment (such as conveying equipment, dehydration equipment, desulfurization equipment, etc.) and has certain versatility in the coal industry, which is convenient for equipment selection, procurement and maintenance.

[0036] Reference Figure 1 to Figure 9 , which is the second embodiment of the present invention, provides a chlorine removal jig equipment for coal preparation, including a jig body 1, the jig body 1 has an inlet 11 and an outlet 12; a screen plate 2 is swingably set on the jig body 1, the screen plate 2 divides the jig body 1 into a jig chamber 13 and a screening chamber 14, and after the screen plate 2 swings, the height of the bottom of the screening chamber 14 near the inlet 11 is lower than or higher than the height near the outlet 12.

[0037] In this embodiment, the jig body 1 is made of corrosion-resistant stainless steel to adapt to the humid and possible corrosive environment during the coal washing process. The jig body 1 is divided into a jig chamber 13 and a screening chamber 14, and the two chambers are separated by a screen plate 2. The jig chamber 13 is used for the jig sorting process of raw coal, and is provided with a water inlet, an air inlet and a discharge port. The screening chamber 14 is used for preliminary screening of the jigged materials. The screen plate 2 is made of high-strength alloy steel and has good wear resistance and corrosion resistance. The screen plate 2 is connected to the inner wall of the jig body 1 by a hinge so that it can swing around the hinge axis. Thereby, the screen plate 2 is tilted toward the inlet 11 or toward the outlet 12. When the screen plate 2 is tilted toward the inlet 11, the time that the raw coal stays on the screen plate 2 can be extended, so that the chlorine element has sufficient time to contact with water and precipitate.

[0038] Through the swing and angle adjustment of the sieve plate 2, the residence time of the coal in the jig can be flexibly adjusted according to the properties and sorting requirements of the raw coal. For raw coal with high chlorine content or large particle size, the residence time can be appropriately increased so that the coal is fully in contact with water and air, thereby improving the precipitation and sorting effect of chloride ions. Suitable sorting conditions are provided for different raw coals, and the versatility and adaptability of the equipment are improved. The swing of the sieve plate 2 can also make the material evenly distributed in the jig, avoid material accumulation and blockage, ensure the stability and continuity of the jig process, and thus improve the sorting efficiency. The jig body 1 has an intelligent control cabinet, which realizes the intelligent control of parameters such as jig wind pressure, water pressure, amplitude, frequency, air intake and air beat, and provides technical guarantee for the full dechlorination of coal.

[0039] Furthermore, the angle between the sieve plate 2 and the horizontal plane after the swing is greater than or equal to -5° and less than or equal to 5°.

[0040] In this embodiment, the angle between the sieve plate 2 and the horizontal plane after swinging can be adjusted between -5° and +5°. When it is necessary to increase the residence time of the coal in the jig, the angle of the sieve plate 2 is adjusted to a larger negative value; when it is necessary to speed up the discharge speed of the material, the angle of the sieve plate 2 is adjusted to a larger positive value. The jig body 1 is provided with a limit plate to prevent the sieve plate 2 from getting stuck after the angle adjustment exceeds the limit position.

[0041] By precisely controlling the angle of the screen plate 2, the jig can operate in the best working condition, giving full play to the performance potential of the equipment, improving the coal processing capacity and sorting efficiency, and thus improving the overall utilization rate of the equipment.

[0042] Furthermore, the lower surfaces of both ends of the screen plate 2 have pushing surfaces 21, and also include a pushing rod 3, which is slidably arranged on the jig body 1, and has a first pushing inclined surface 31 and a second pushing inclined surface 32. The heights of the first pushing inclined surface 31 and the second pushing inclined surface 32 gradually decrease from one end close to each other to the two ends of the pushing rod 3, and the first pushing inclined surface 31 and the first pushing inclined surface 31 are respectively in contact with the two pushing surfaces 21.

[0043] In this embodiment, the two ends of the push rod 3 are respectively processed with a first push inclined surface 31 and a second push inclined surface 32, and the height gradually decreases from one end close to each other to the two ends of the push rod 3, and a push surface 21 is processed on the lower surface of the two ends of the sieve plate 2. The push surface 21 is an inclined surface that matches the inclined surface of the push rod 3. The push rod 3 can slide freely in the horizontal direction. The first push inclined surface 31 of the push rod 3 abuts against the push surface 21 at one end of the sieve plate 2, and the second push inclined surface 32 abuts against the push surface 21 at the other end of the sieve plate 2. When the push rod 3 moves in the horizontal direction, the sieve plate 2 is pushed to swing around the hinge axis to adjust the angle of the sieve plate 2.

[0044] The inclined surface design of the push rod 3 closely matches the push surface 21 of the screen plate 2, and can accurately convert the horizontal displacement of the push rod 3 into the angle change of the screen plate 2. This mechanical structure has reliable transmission and high precision, and can ensure that the screen plate 2 is accurately adjusted within the range of -5° to +5°, meeting the needs of raw coal sorting under different process conditions.

[0045] The connection structure between the push rod 3 and the screen plate 2 is relatively simple and easy to install, disassemble and maintain. When maintaining the equipment or replacing parts, the operator can easily remove the push rod 3 from the jig body 1 to inspect or replace it, which is also convenient for maintaining and cleaning the screen plate 2, reducing the difficulty and cost of equipment maintenance.

[0046] Furthermore, the jig machine body 1 has a first mounting port 15 and a second mounting port 16, wherein the first mounting port 15 is located at one end of the jig chamber 13 close to the inlet 11, and the second mounting port 16 is located at one end of the jig chamber 13 close to the outlet 12. Both ends of the push rod 3 are respectively slidably disposed in the first mounting port 15 and the second mounting port 16, and further comprises a baffle 4, which is slidably disposed at the first mounting port 15, and the lower end of the baffle 4 abuts against the first push inclined surface 31; both ends of the first elastic member 5 act on the jig machine body 1 and the baffle 4 respectively, so as to provide a force for the baffle 4 to approach the push rod 3.

[0047] In this embodiment, the baffle 4 is installed at the first mounting port 15 of the jig body 1 through a sliding guide rail so that it can slide freely in the vertical direction. The lower end of the baffle 4 abuts against the first push slope 31 of the push rod 3, and the upper end is connected to the first elastic member 5. One end of the first elastic member 5 is fixed to the jig body 1, and the other end is connected to the upper end of the baffle 4. When installing the spring, ensure that the spring is in a natural elongation state to provide a downward pre-pressure for the baffle 4. Under the action of the first elastic member 5, the baffle 4 is tightly pressed against the first push slope 31 of the push rod 3 to prevent the water in the jig body 1 from overflowing from the first mounting port 15. A water guide component can also be installed on the outside of the first mounting port 15 to recycle the water when water overflows.

[0048] When the jig machine starts working and the angle of the screen plate 2 needs to be adjusted, the push rod 3 slides toward the first mounting opening 15 under the action of an external power (such as a hydraulic cylinder or a motor drive). At this time, the first push inclined surface 31 of the push rod 3 pushes the baffle plate 4 upward, and the baffle plate 4 slides upward against the elastic force of the first elastic member 5. As the push rod 3 continues to move, the push rod 3 lifts one end of the screen plate 2 through the action of the inclined surface, thereby adjusting the angle of the screen plate 2.

[0049] Reset process: After the push rod 3 is reset, the baffle plate 4 slides in the opposite direction and resets under the action of the gravity of the sieve plate 2 and the first elastic member 5 .

[0050] The baffle plate 4 and the first elastic member 5 have simple structures and are conveniently installed for operation and maintenance. During equipment maintenance, if the baffle plate 4 or the first elastic member 5 needs to be replaced, the operator can easily disassemble and install them, thereby reducing maintenance costs and downtime.

[0051] Furthermore, the side wall of the screening chamber 14 close to the inlet 11 has a stopper 17, one end of which has a groove 171, and also includes a guide plate 6, which is swingably set on the jig body 1, and both ends of the guide plate 6 are respectively in contact with the groove 171 and the screen plate 2.

[0052] In this embodiment, one end of the guide plate 6 is connected to the inner wall of the inlet 11 of the jig body 1 by a hinge, so that it can swing around the hinge axis. A stopper 17 is set on the side wall of the screening chamber 14 near the inlet 11. The stopper 17 is a protruding steel plate with a length the same as the width of the screening chamber 14. A groove 171 is processed at one end of the stopper 17. The size of the groove 171 matches that of one end of the guide plate 6. When the screen plate 2 swings, the guide plate 6 can adjust its angle accordingly to ensure that the coal can smoothly enter the screening chamber 14 from the inlet 11, and there will be no material blockage or leakage during the screening process.

[0053] The setting of the guide plate 6 can effectively guide the raw coal from the inlet 11 of the jig machine to smoothly enter the screening chamber 14, avoiding the accumulation or blockage of the material at the inlet 11. In particular, when the raw coal has a large particle size or high humidity, the guide plate 6 can play a good guiding role, ensuring that the raw coal can be evenly distributed on the screen plate 2, providing good initial conditions for the subsequent jig separation process.

[0054] When the screen plate 2 swings during operation, the guide plate 6 can adjust its position in time according to the angle change of the screen plate 2, always maintaining close contact with the screen plate 2, and preventing the raw coal from being stuck between the screen plate 2 and the jig body 1. This adaptive design improves the adaptability of the equipment to different working conditions, ensures the continuous flow and uniform distribution of coal during the jig process, and is conducive to improving the sorting efficiency and quality.

[0055] Furthermore, the lower surfaces of both ends of the sieve plate 2 have limiting grooves 22 , and the pushing surface 21 is located on the limiting grooves 22 .

[0056] In this embodiment, the pushing surface 21 is located in the limiting groove 22 of the sieve plate 2. Through the limiting and guiding effects of the limiting groove 22, the angle adjustment of the sieve plate 2 is made more stable.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A chlorine removal process for coal preparation, characterized in that: The following steps are involved: S1. Pretreatment: transport high-chloride raw coal immersed in water; S2. Jigging separation: The raw coal is subjected to jigging separation. Within a frequency cycle, the rest period accounts for 30%-50% of the entire frequency cycle. Coal products and gangue are obtained after separation. S3, transportation and dehydration: spray water during transportation of coal products after jigging and sorting. After spraying, the coal products are dehydrated to complete the dechlorination of the coal products and obtain dechlorinated coal products; S4. Desulfurization: The dechlorinated coal product is desulfurized to obtain the final refined product.

2. A chlorine removal process for coal preparation according to claim 1, characterized in that: In step S2, one frequency cycle includes an intake period, an expansion period, an exhaust period, and a rest period. If the time of one frequency cycle is 100, then the exhaust period = the intake period - 3.

3. A chlorine removal process for coal preparation according to claim 1, characterized in that The frequency of the jigging separation in step S2 is 0.15 Hz-0.5 Hz.

4. A chlorine removal process for coal preparation according to claim 1, characterized in that: In the step S2, during jigging and sorting, the air is introduced at least twice. In the step S1, a scraper feeder is used for conveying the raw coal, and the scraper of the scraper feeder is immersed in water.

5. A chlorine removal jigging equipment for coal preparation, used in a chlorine removal process for coal preparation as claimed in any one of claims 1 to 4, characterized in that: include A jig body (1), wherein the jig body (1) has an inlet (11) and an outlet (12); A screen plate (2), the screen plate (2) being swingably disposed on the jig machine body (1), the screen plate (2) dividing the jig machine body (1) into a jig chamber (13) and a screening chamber (14), and after the screen plate (2) is swung, the height of the bottom of the screening chamber (14) on the side close to the inlet (11) is lower than or higher than the height on the side close to the outlet (12).

6. A chlorine removal jigging equipment for coal preparation according to claim 5, characterized in that: The angle between the sieve plate (2) and the horizontal plane after the swing is greater than or equal to -5° and less than or equal to 5°.

7. A chlorine removal jigging equipment for coal preparation according to claim 5, characterized in that: The lower surfaces of both ends of the sieve plate (2) have push surfaces (21), and also include A push rod (3), the push rod (3) being slidably disposed on the jig body (1), the push rod (3) having a first push inclined surface (31) and a second push inclined surface (32), the heights of the first push inclined surface (31) and the second push inclined surface (32) gradually decreasing from one end close to each other to the two ends of the push rod (3), the first push inclined surface (31) and the second push inclined surface (32) respectively abutting against the two push surfaces (21).

8. A chlorine removal jigging equipment for coal preparation according to claim 7, characterized in that: The jig machine body (1) has a first mounting opening (15) and a second mounting opening (16), wherein the first mounting opening (15) is located at one end of the jig chamber (13) close to the inlet (11), and the second mounting opening (16) is located at one end of the jig chamber (13) close to the outlet (12), and the two ends of the push rod (3) are slidably disposed in the first mounting opening (15) and the second mounting opening (16), respectively. a baffle (4), the baffle (4) being slidably disposed at the first mounting opening (15), the lower end of the baffle (4) being in contact with the first push inclined surface (31); A first elastic member (5), wherein two ends of the first elastic member (5) act on the jig body (1) and the baffle plate (4) respectively, and are used to provide a force for the baffle plate (4) to approach the push rod (3).

9. A chlorine removal jigging equipment for coal preparation according to claim 5, characterized in that: The side wall of the screening chamber (14) close to the inlet (11) has a stopper (17), one end of the stopper (17) has a groove (171), and further includes: A material guide plate (6), the material guide plate (6) being swingably arranged on the jig machine body (1), and two ends of the material guide plate (6) being respectively in contact with the groove (171) and the screen plate (2).

10. A chlorine removal jigging equipment for coal preparation according to claim 7, characterized in that: The lower surfaces of both ends of the sieve plate (2) are provided with limiting grooves (22), and the pushing surface (21) is located on the limiting grooves (22).

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