Pneumatic conveying device and slag treatment system

Abstract

The invention discloses a pneumatic conveying device and a slag treatment system, and relates to the technical field of slag conveying, and the pneumatic conveying device is used for conveying slag to a comprehensive utilization point. Comprising a screening machine, a grinding machine, at least one sending tank, at least one first switch valve group, a compressed air pipeline, at least one air inlet valve group, a pneumatic conveying pipeline and a pneumatic conveying valve group. According to the technical scheme, after the pneumatic conveying valve set is started, air in the sending tank enters the pneumatic conveying pipeline and moves along the pneumatic conveying pipeline, meanwhile, slag in the sending tank is driven by the air to enter the pneumatic conveying pipeline, and the slag in the sending tank is discharged out of the pneumatic conveying pipeline under the driving of the air. The furnace slag is conveyed along the pneumatic conveying pipeline, pneumatic conveying of the furnace slag is achieved, in the conveying process of the furnace slag, the furnace slag is prevented from being exposed in the external environment, and the problem that the furnace slag is prone to escaping into the environment is solved on the whole.

Description

Technical Field

[0001] The present invention relates to the technical field of slag conveying, and in particular to a pneumatic conveying device and a slag processing system. Background Art

[0002] In the existing slag treatment process of fluidized bed boilers, the slag discharged from the fluidized bed boiler is often first heat exchanged by a drum slag cooler, and then the heat exchanged slag is sent to a chain bucket conveyor, and then the bucket elevator completes the vertical transfer of the slag, and finally the slag is sent to a slag buffer bin, and a dry slag loader is installed at the bottom of the slag buffer bin. The dry slag loader can load the slag into a transport vehicle, and the transport vehicle can transport the slag to an off-site ash slag plant or a comprehensive utilization point. In the process of transporting the slag by the transport vehicle, the slag is easy to escape into the environment. Summary of the invention

[0003] The main purpose of the present invention is to provide a pneumatic conveying device and a slag treatment system, aiming to improve the problem that slag is easily dissipated into the environment.

[0004] To achieve the above-mentioned purpose, the pneumatic conveying device proposed in the present invention is used to convey slag to a comprehensive utilization point, comprising:

[0005] A screening machine having a discharge port below the screen and a discharge port above the screen, wherein the feed port of the screening machine is used to connect to the slag transmission device;

[0006] A mill, wherein the feed inlet of the mill is connected to the discharge outlet on the screen;

[0007] At least one sending tank, the under-screen discharge port and the discharge port of the mill are both connected to the feed port of at least one sending tank;

[0008] At least a first switch valve group, at least one of the first switch valve groups is arranged in one-to-one correspondence with at least one of the sending tanks, and the first switch valve group is arranged on the feed port of the corresponding sending tank;

[0009] A compressed air pipeline, wherein the air inlet of at least one of the sending tanks is connected to the compressed air pipeline;

[0010] At least one air intake valve group, at least one of the air intake valve groups is arranged corresponding to the air intake port of the sending tank, and the air intake valve group is arranged on the corresponding air intake port of the sending tank;

[0011] A pneumatic conveying pipeline, wherein the discharge port of at least one of the sending tanks is connected to the pneumatic conveying pipeline; and

[0012] The pneumatic conveying valve group is arranged on the pneumatic conveying pipeline.

[0013] In one embodiment, at least one of the sending tanks includes two sending tanks, one of the sending tanks is connected to the under-screen discharge port, and the other of the sending tanks is connected to the discharge port of the mill.

[0014] In one embodiment, the pneumatic conveying device also includes at least one pressure balance bin, which is arranged in a one-to-one correspondence with the sending tank, the under-screen discharge port and the discharge port of the grinder are both connected to the feed port of at least one of the pressure balance bins, and the discharge port of the pressure balance bin is connected to the corresponding feed port of the sending tank. A pressure balance component is arranged between the pressure balance bin and the sending tank, and the pressure balance component is used to adjust the air pressure in the pressure balance bin to be the same as the air pressure in the sending tank.

[0015] In one embodiment, the pressure balancing assembly includes an exhaust pipe and an exhaust valve group arranged on the exhaust pipe, and the feed port of the pressure balancing bin is provided with a second switch valve group.

[0016] In one embodiment, the pneumatic conveying device also includes at least one buffer bin, the feed port of at least one sending tank is connected to the discharge port of the buffer bin, and the under-screen discharge port and the discharge port of the grinder are both connected to the feed port of at least one buffer bin.

[0017] In one embodiment, a blowing-assisting pipe is connected between the compressed air pipeline and the pneumatic conveying pipeline.

[0018] The present invention also provides a slag processing system, comprising a pneumatic conveying device.

[0019] The pneumatic conveying device is used to convey the slag to the comprehensive utilization point, comprising:

[0020] A screening machine having a discharge port below the screen and a discharge port above the screen, wherein the feed port of the screening machine is used to connect to the slag transmission device;

[0021] A mill, wherein the feed inlet of the mill is connected to the discharge outlet on the screen;

[0022] At least one sending tank, the under-screen discharge port and the discharge port of the mill are both connected to the feed port of at least one sending tank;

[0023] At least a first switch valve group, at least one of the first switch valve groups is arranged in one-to-one correspondence with at least one of the sending tanks, and the first switch valve group is arranged on the feed port of the corresponding sending tank;

[0024] A compressed air pipeline, wherein the air inlet of at least one of the sending tanks is connected to the compressed air pipeline;

[0025] At least one air intake valve group, at least one of the air intake valve groups is arranged corresponding to the air intake port of the sending tank, and the air intake valve group is arranged on the corresponding air intake port of the sending tank;

[0026] A pneumatic conveying pipeline, wherein the discharge port of at least one of the sending tanks is connected to the pneumatic conveying pipeline; and

[0027] Pneumatic conveying valve group, arranged on the pneumatic conveying pipeline

[0028] In one embodiment, the slag treatment system further comprises:

[0029] A heat exchanger, wherein the feed port of the heat exchanger is used to connect to the slag discharge port of the boiler; and

[0030] A slag conveying device, wherein the feed port of the slag conveying device is connected to the discharge port of the heat exchanger, and the discharge port of the slag conveying device is connected to the feed port of the screening machine.

[0031] In one embodiment, the heat exchanger comprises at least two heat exchange sections connected end to end.

[0032] In one embodiment, a slag deceleration device is provided in the heat exchange section.

[0033] The technical solution of the present invention can send slag less than or equal to the particle size requirement into the sending tank through the under-screen discharge port by setting a screening machine, and send slag greater than the particle size requirement into the mill through the over-screen discharge port, and crush the slag to a particle size less than or equal to the particle size requirement by the mill, thereby completing the processing of the slag; then, the first switch valve group is opened to send the processed slag into the sending tank; when the slag contained in the sending tank reaches a certain amount, the first switch valve group is closed and the air intake valve group is opened to send the air in the compressed air pipeline into the sending tank, thereby realizing the internal pressurization of the sending tank, so that the sending tank The air pressure inside is greater than the air pressure in the pneumatic conveying pipeline; when the compressed air enters the sending tank, the compressed air can blow up the slag, making the slag in the sending tank fluffy; after the pneumatic conveying valve group is opened, the air in the sending tank enters the pneumatic conveying pipeline and moves along the pneumatic conveying pipeline, and at the same time, the slag in the sending tank enters the pneumatic conveying pipeline driven by the air, and the slag is transported along the pneumatic conveying pipeline under the drive of the air, thereby realizing the pneumatic conveying of the slag. During the transportation of the slag, the exposure of the slag to the external environment is reduced, and the problem of the slag being easily dissipated into the environment is improved as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 A schematic structural diagram of an embodiment of a pneumatic conveying device provided by the present invention;

[0036] Figure 2 A schematic structural diagram of an embodiment of a slag treatment system provided by the present invention;

[0037] Figure 3 for Figure 2 Schematic diagram of the connection structure of the heat exchanger;

[0038] Figure 4 for Figure 3 The structural schematic diagram of the heat exchange section in FIG.

[0039] Figure 5 for Figure 4 Schematic diagram of the internal local structure of the middle heat exchange section;

[0040] Figure 6 for Figure 2 Schematic diagram of the structure of the slag conveying device.

[0041] Description of Figure Numbers:

[0042] 100, pneumatic transmission device; 101, screening machine; 102, grinding machine; 103, sending tank; 104, first switch valve group; 1041, first manual gate valve; 1042, pneumatic gate valve; 1043, swing valve; 105, compressed air pipeline; 106, air intake valve group; 1061, pneumatic ball valve; 1062, pneumatic check valve; 107, pneumatic transmission pipeline; 1071, elbow section; 1072, two straight sections; 108, pneumatic transmission valve group; 1081, pneumatic discharge valve; 1082, manual discharge valve; 109, pressure balance chamber; 110, pressure balance assembly; 1101, exhaust pipe; 1102, exhaust valve group; 111, second switch valve group; 1111, second manual gate valve; 1112, electric rotary valve; 112, buffer chamber; 113, first expansion joint; 114, slag discharge pipe; 115, blockage removal valve; 116, second expansion joint; 117, blow-assist pipe; 118, blow-assist valve group;

[0043] 200, slag treatment system; 201, heat exchanger; 2011, heat exchange section; 2012, drum; 202, slag transmission device; 2021, first horizontal transmission section; 2022, first vertical transmission section; 2023, second horizontal transmission section; 203, slag temperature monitoring device; 204, slag feed valve group; 205, third expansion joint; 206, water wall tube; 207, water inlet pipeline; 208, return Water pipe; 209, dust extraction pipe; 210, feed pipe; 2101, connection section; 2102, elbow guide section; 2103, inclined section; 2104, outlet section; 211, slag retaining ring; 213, transmission gear; 214, loading port; 215, unloading port; 216, driving device; 217, return scraper; 2171, horizontal scraping section; 2172, arc-shaped return section; 218, dust collecting port.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] In the slag treatment process of the existing fluidized bed boiler, the slag discharged from the fluidized bed boiler is often first heat exchanged by a roller slag cooler, and then the heat exchanged slag is sent to a chain bucket conveyor, and then the bucket elevator completes the vertical transfer of the slag, and finally the slag is sent to the buffer bin. The temporary storage time of the slag in the buffer bin is generally not less than 24 hours. A dry slag loader is installed at the bottom of the slag buffer bin, and the slag can be loaded into a transport vehicle through the dry slag loader, and the slag is transported to an off-site ash slag plant or a comprehensive utilization point by the transport vehicle. In the process of transporting the slag by the transport vehicle, especially in the process of loading and unloading the slag, the slag needs to be lifted and lowered many times. In the process of transporting the slag by the transport vehicle, the slag is easily exposed to the environment, making it easy for the slag to escape into the environment.

[0049] The invention provides a pneumatic conveying device.

[0050] See also Figure 1 and Figure 2 In one embodiment of the present invention, the pneumatic conveying device is used to transport slag to a comprehensive utilization point, comprising:

[0051] The screening machine 101 has a discharge port below the screen and a discharge port above the screen, and the feed port of the screening machine 101 is used to connect to the slag conveying device 202;

[0052] A mill 102, wherein the feed port of the mill 102 is connected to the discharge port on the sieve;

[0053] At least one sending tank 103, the under-screen discharge port and the discharge port of the mill 102 are both connected to the feed port of at least one sending tank 103;

[0054] At least a first switch valve group 104, at least one of the first switch valve groups 104 is arranged in one-to-one correspondence with at least one of the sending tanks 103, and the first switch valve group 104 is arranged on the feed port of the corresponding sending tank 103;

[0055] A compressed air pipeline 105, wherein the air inlet of at least one of the sending tanks 103 is connected to the compressed air pipeline 105;

[0056] At least one air intake valve group 106, at least one of the air intake valve groups 106 is arranged corresponding to the air intake port of the sending tank 103, and the air intake valve group 106 is arranged on the corresponding air intake port of the sending tank 103;

[0057] A pneumatic conveying pipeline 107, wherein the discharge port of at least one of the sending tanks 103 is connected to the pneumatic conveying pipeline 107; and

[0058] The pneumatic conveying valve group 108 is arranged on the pneumatic conveying pipeline 107 .

[0059] The technical solution of the present invention is to provide a screening machine 101, so that slag less than or equal to the particle size requirement can be sent to the sending tank 103 through the under-screen discharge port, and slag greater than the particle size requirement can be sent to the mill 102 through the above-screen discharge port, and the slag is crushed to a particle size less than or equal to the particle size requirement by the mill 102, thereby completing the treatment of the slag; then the first switch valve group 104 is opened, so that the treated slag can be sent to the sending tank 103; when the slag contained in the sending tank 103 reaches a certain amount, the first switch valve group 104 is closed and the air intake valve group 106 is opened, so that the air in the compressed air pipeline 105 can be sent to the sending tank 103, thereby achieving the internal pressurization of the sending tank 103, so that the The air pressure in the sending tank 103 is greater than the air pressure in the pneumatic conveying pipeline 107; when the compressed air enters the sending tank 103, the compressed air can blow up the slag, making the slag in the sending tank 103 fluffy; after the pneumatic conveying valve group 108 is opened, the air in the sending tank 103 enters the pneumatic conveying pipeline 107 and moves along the pneumatic conveying pipeline 107, and at the same time, the slag in the sending tank 103 enters the pneumatic conveying pipeline 107 driven by the air, and the slag is transported along the pneumatic conveying pipeline 107 driven by the air, thereby realizing the pneumatic conveying of the slag. During the transportation of the slag, the exposure of the slag to the external environment is reduced, which improves the problem of the slag being easily dissipated into the environment as a whole.

[0060] The air inlet of the sending tank 103 is arranged in sequence and spaced along the height direction of the sending tank 103. When the air in the compressed air pipe 105 is sent into the sending tank 103, multiple blowing points can be formed along the height direction of the sending tank 103, so that the slag in the sending tank 103 is blown upward at multiple blowing points, and the slag in the sending tank 103 can be effectively mixed with air. Specifically, in the present application, the sending tank 103 has three air inlets, one of which is arranged at the top side of the sending tank 103, another of which is arranged at the middle area of ​​the sending tank 103, and the last of which is arranged at the bottom of the sending tank 103.

[0061] See also Figure 1Specifically, the screening machine 101 includes a roller screening machine 101, and the screening particle size of the screening machine 101 is 1 mm (millimeter). After the slag enters the screening machine 101, the slag with a particle size less than or equal to 1 mm can be discharged to the outside of the screening machine 101 through the under-screen discharge port, and the slag with a particle size greater than 1 mm can be discharged to the outside of the screening machine 101 through the over-screen discharge port, and the slag with a particle size greater than 1 mm can be sent to the mill 102, and the mill 102 can crush and grind the slag entering the mill 102.

[0062] The grinder 102 is used to crush and grind the slag to a particle size less than or equal to 1 mm, so that the particle size of the slag entering the sending tank 103 is less than or equal to 1 mm, which can ensure the transportation of the slag by air.

[0063] The air intake valve group 106 includes at least one of a pneumatic ball valve 1061 and a pneumatic check valve 1062. Specifically, the air intake valve group 106 includes a pneumatic ball valve 1061 and a pneumatic check valve 1062 which are arranged in sequence. Through the pneumatic check valve 1062, the backflow of gas and slag in the sending tank 103 to the compressed air pipeline 105 can be reduced, and the unobstructed state of the compressed air pipeline 105 can be ensured.

[0064] See also Figure 1 The pneumatic conveying valve group 108 includes at least one of a pneumatic discharge valve 1081 and a manual discharge valve 1082. Specifically, the pneumatic conveying valve group 108 includes a pneumatic discharge valve 1081 and a manual discharge valve 1082 arranged in sequence. When the pneumatic discharge valve 1081 is opened, the opening and closing of the manual discharge valve 1082 can be manually controlled to control the on-off of the pneumatic conveying pipeline 107; the pneumatic discharge valve 1081 can be automatically opened and closed by remote control. When the manual discharge valve 1082 is opened, the opening and closing of the pneumatic discharge valve 1081 can be controlled to control the on-off of the pneumatic conveying pipeline 107; by controlling the pneumatic discharge valve 1081 and the manual discharge valve 1082 to be closed at the same time, the transmission interruption of the pneumatic conveying pipeline 107 can be effectively guaranteed.

[0065] At least one of the sending tanks 103 includes two sending tanks 103, one of which is connected to the under-screen discharge port, and the other of which is connected to the discharge port of the mill 102. One of the sending tanks 103 can send the slag processed by the mill 102 to the pneumatic conveying pipeline 107 alone.

[0066] The pneumatic conveying device also includes at least one pressure balance bin 109, which is arranged in a one-to-one correspondence with the sending tank 103. The under-screen discharge port and the discharge port of the grinder 102 are both connected to the feed port of at least one pressure balance bin 109, and the discharge port of the pressure balance bin 109 is connected to the corresponding feed port of the sending tank 103. A pressure balance component 110 is arranged between the pressure balance bin 109 and the sending tank 103, and the pressure balance component 110 is used to adjust the air pressure in the pressure balance bin 109 to be the same as the air pressure in the sending tank 103.

[0067] The slag can be temporarily stored through the pressure balance bin 109 . When the air pressure in the pressure balance bin 109 is adjusted to be the same as the air pressure in the sending tank 103 , the slag in the pressure balance bin 109 can quickly fall into the sending tank 103 .

[0068] The pressure balance component 110 includes an exhaust pipe 1101 and an exhaust valve group 1102 arranged on the exhaust pipe 1101 , and the feed port of the pressure balance chamber 109 is provided with a second switch valve group 111 .

[0069] After the slag in the sending tank 103 is sent into the pneumatic conveying pipeline 107, the pneumatic transmission valve group, the air intake valve group 106 and the second switch valve group 111 are controlled to be closed, and the air pressure in the sending tank 103 is greater than the air pressure in the pressure balance chamber 109. By opening the exhaust valve group 1102, the gas in the sending tank 103 can be sent into the pressure balance chamber 109, so that the gas pressure in the sending tank 103 and the pressure balance chamber 109 are balanced. After opening the first switch valve group 104, the slag in the sending tank 103 can quickly fall into the sending tank 103. While accelerating the delivery of the slag into the sending tank 103, the pressure of the gas in the sending tank 103 is guaranteed, so that the sending tank 103 can pressurize the slag in the sending tank 103 and send it into the pneumatic conveying pipeline 107.

[0070] In the process of the slag in the pressure balance chamber 109 falling into the sending tank 103, the air inlet valve group 106 is kept open, so that the slag falling into the sending tank 103 can be quickly blown into the pneumatic conveying pipeline 107. After all the slag in the pressure balance chamber 109 falls into the sending tank 103, the connection between the pressure balance chamber 109 and the sending tank 103 is closed, so that the pressure balance chamber 109 can be supplied with slag alone, and at the same time, the sending tank 103 can continue to pressurize and blow the slag in the pneumatic conveying pipeline 107.

[0071] In one sending cycle of the sending tank 103, the air intake valve group 106 is first opened to make the gas pressure in the sending tank 103 higher than the air pressure in the pneumatic conveying pipe 107 by 0.15-0.20Mpa. When the slag in the sending tank 103 is completely transported to the pneumatic conveying pipe 107, specifically, when the air pressure of the pneumatic conveying pipe 107 is lower than 40Kpa, the air intake pipe and the pneumatic conveying valve group 108 are closed, and then the pressure relief valve group and the first switch valve group 104 are opened, so that the pressure of the sending tank 103 and the pressure balance bin 109 can be balanced, so that the slag in the pressure balance bin 109 can be quickly dropped into the sending tank 103; when the slag in the sending tank 103 is filled, the pressure balance bin 109 can be easily filled with slag by closing the first pressure relief valve group and the first switch valve group 104.

[0072] A plurality of sending tanks 103 may be provided. By controlling the plurality of sending tanks 103 to send the slag at intervals, it is possible to ensure that the pneumatic transmission pipeline continuously sends the slag while ensuring the gas flow in the pneumatic transmission pipeline 107, thereby ensuring the pneumatic transmission effect of the slag.

[0073] Both the sending tank 103 and the pressure balance tank 109 may be provided with an air release valve. By opening the air release valve on the sending tank 103, the air in the sending tank 103 can be released to the outside of the sending tank 103; by opening the air release valve on the pressure balance tank 109, the air on the pressure balance tank 109 can be released to the outside of the pressure balance tank 109.

[0074] The pneumatic conveying device further includes at least one buffer bin 112, the feed port of at least one of the sending tanks 103 is connected to the discharge port of the buffer bin 112, and the under-screen discharge port and the discharge port of the mill 102 are both connected to the feed port of at least one of the buffer bins 112. The buffer bin 112 can be used to store the screened slag and the slag crushed by the mill 102.

[0075] See also Figure 1 At least one buffer bin 112 includes two buffer bins 112, and the two buffer bins 112 correspond to and are connected to the two pressure balance bins 109 one by one. One of the buffer bins 112 is connected to the under-screen discharge port, and the other buffer bin 112 is connected to the discharge port of the mill 102. By setting up a separate buffer bin 112 to hold the slag crushed by the mill 102, it is convenient to check the particle size of the slag crushed by the mill 102.

[0076] The buffer bin 112, the pressure balance bin 109 and the sending tank 103 are arranged in a one-to-one correspondence, so that one sending tank 103 can independently send the slag crushed by the mill 102 to the pneumatic conveying pipeline 107. When the mill 102 fails, the other sending tank 103 can ensure that the slag flowing out of the under-screen outlet is sent into the pneumatic conveying pipeline 107.

[0077] The first switch valve group 104 includes at least one of a first manual gate valve 1041, a pneumatic gate valve 1042 and a swing valve 1043. Specifically, the first switch valve group 104 includes a first manual gate valve 1041, a pneumatic gate valve 1042 and a swing valve 1043 arranged in sequence. The feed port of the sending tank 103 is also connected to a first expansion joint 113, the first expansion joint 113 includes a metal expansion joint, and the first expansion joint 113 is connected to the discharge port of the pressure balance bin 109.

[0078] The second switch valve group 111 includes at least one of a second manual gate valve 1111 and an electric rotary valve 1112. Specifically, the second switch valve group 111 includes a gate valve and an electric rotary valve 1112 which are arranged in sequence.

[0079] The pneumatic conveying pipeline 107 is connected with a slag discharge pipe 114, and the slag discharge pipe 114 is provided with a drain valve 115. The pneumatic conveying valve group 108 is located between the drain valve 115 and the sending tank 103. When the slag is blocked in the pneumatic conveying pipeline 107, the drain valve 115 is controlled to open, so that the slag in the pneumatic conveying pipeline 107 can be discharged through the slag discharge pipe 114.

[0080] The outlet of the slag discharge pipe 114 can be connected to the feed port of the buffer bin 112 to facilitate the storage of slag, and the outlet of the slag discharge pipe 114 can be connected to the feed port of the mill 102 to facilitate the re-crushing of the blocked slag. The slag discharge pipe 114 has a second expansion joint 116, which can ensure the stability of the connection between the slag discharge pipe 114 and the other pipelines when the slag discharge pipe 114 vibrates.

[0081] The pneumatic conveying pipeline 107 includes at least one curved pipe section 1071 and at least two straight pipe sections 1072 arranged at intervals. When the slag passes through the curved pipe section 1071, the slag is easy to fall and accumulate. A blow-assisting pipe 117 is connected between the compressed air pipeline 105 and the pneumatic conveying pipeline 107. The blow-assisting pipe 117 can blow compressed air into the pneumatic conveying pipeline 107, thereby blowing the slag in the pneumatic conveying pipeline 107 to move and reduce the accumulation of the slag.

[0082] At least one of the curved pipe sections 1071 is flange-connected to any two of the at least two straight pipe sections, which facilitates disassembly and clearing of blockages in the pneumatic transmission pipeline.

[0083] The blowing-assisting pipes 117 are provided in plurality corresponding to the curved pipe sections 1071. The blowing-assisting pipes 117 are tangent to and connected with the corresponding ends of the curved pipe sections 1071, and the tangents of the blowing-assisting pipes 117 and the corresponding ends of the curved pipe sections 1071 are in the same direction, thereby ensuring that the air blown into the pneumatic conveying pipe 107 by the blowing-assisting pipes 117 is in the same direction as the conveying direction of the pneumatic conveying pipe 107, thereby ensuring that the blowing-assisting pipes 117 assist in blowing the slag in the pneumatic conveying pipe 107; when the slag flows to the end of the curved pipe section 1071, the flow rate of the slag is reduced, and the blowing-assisting pipes 117 can be used to blow the slag at the end of the curved pipe section 1071, thereby reducing the accumulation of the slag.

[0084] The blow-assisting pipe 117 is provided with a blow-assisting valve group 118 , and the blow-assisting pipe 117 can be controlled to be on and off by the blow-assisting valve group 118 .

[0085] See also Figure 1 and Figure 2 The present invention also proposes a slag treatment system 200, which includes a pneumatic conveying device. The specific structure of the pneumatic conveying device refers to the above embodiment. The slag treatment system 200 adopts all technical solutions of all the above embodiments. The pneumatic conveying device is used to transport the slag to the comprehensive utilization point, and includes:

[0086] The screening machine 101 has a discharge port below the screen and a discharge port above the screen, and the feed port of the screening machine 101 is used to connect to the slag conveying device 202;

[0087] A mill 102, wherein the feed port of the mill 102 is connected to the discharge port on the sieve;

[0088] At least one sending tank 103, the under-screen discharge port and the discharge port of the mill 102 are both connected to the feed port of at least one sending tank 103;

[0089] At least a first switch valve group 104, at least one of the first switch valve groups 104 is arranged in one-to-one correspondence with at least one of the sending tanks 103, and the first switch valve group 104 is arranged on the feed port of the corresponding sending tank 103;

[0090] A compressed air pipeline 105, wherein the air inlet of at least one of the sending tanks 103 is connected to the compressed air pipeline 105;

[0091] At least one air intake valve group 106, at least one of the air intake valve groups 106 is arranged corresponding to the air intake port of the sending tank 103, and the air intake valve group 106 is arranged on the corresponding air intake port of the sending tank 103;

[0092] A pneumatic conveying pipeline 107, wherein the discharge port of at least one of the sending tanks 103 is connected to the pneumatic conveying pipeline 107; and

[0093] The pneumatic conveying valve group 108 is arranged on the pneumatic conveying pipeline 107 .

[0094] The slag treatment system 200 further includes:

[0095] A heat exchanger 201, wherein the feed port of the heat exchanger 201 is used to connect to the slag discharge port of the boiler; and

[0096] The slag conveying device 202 , the feed port of the slag conveying device 202 is connected to the discharge port of the heat exchanger 201 , and the discharge port of the slag conveying device 202 is connected to the feed port of the screening machine 101 .

[0097] By providing the heat exchanger 201 , the slag discharged from the boiler can be cooled by heat exchange, and then the cooled slag can be transferred to the feed port of the screening machine 101 through the slag conveying device 202 .

[0098] The heat exchanger 201 includes at least two heat exchange sections 2011 connected end to end. The number and position of the heat exchange sections 2011 can be set according to the installation area. By setting multiple heat exchange sections 2011, the space requirement of a single heat exchange section 2011 is reduced, making the installation of the heat exchanger 201 more flexible.

[0099] Specifically, the heat exchange section 2011 includes a roller 2012 type slag cooler, and the heat exchanger 201 includes a first heat exchange section 2011 and a tail heat exchange section 2011. The feed port of the first heat exchange section 2011 is connected to the slag discharge port of the boiler, and a slag temperature monitoring device 203, a slag feed valve group 204 and a third expansion joint 205 are connected between the feed port of the first heat exchange section 2011 and the slag discharge port of the boiler. The third expansion joint 205 includes a metal expansion joint. Through the third expansion joint 205, the stability of the connection between the feed port of the first heat exchange section 2011 and the slag discharge port of the boiler can be guaranteed. Specifically, the third expansion joint 205 uses a bellows made of 310S high temperature resistant material to absorb the thermal expansion of the feed port of the first heat exchange section 2011. Through the slag temperature monitoring device 203, the temperature of the slag entering the heat exchanger 201 can be monitored. The slag feed valve group 204 can control the connection between the feed port of the first heat exchange section 2011 and the slag discharge port of the boiler.

[0100] See also Figure 2 and Figure 3 The discharge port of each heat exchange section 2011 is provided with a temperature monitoring device, which can monitor the temperature of the slag. The side wall of the heat exchange section 2011 is provided with a plurality of water-cooled wall tubes 206 in sequence along the circumferential direction, thereby forming a cooling drum 2012 membrane wall. The water-cooled wall tubes 206 include a 20g (GB3087) seamless steel pipe, which can withstand a high cooling water pressure. The water pressure in the membrane wall of the cooling drum 2012 can be increased to increase the water flow rate in the membrane wall of the cooling drum 2012, thereby improving the heat exchange efficiency of the heat exchange section 2011.

[0101] The cooling medium in the membrane wall of the cooling drum 2012 is condensed water. Specifically, the cooling medium in the membrane wall of the cooling drum 2012 is turbine condensed water. The condensed water has a low impurity content, which reduces pipe scaling and can avoid pipe burst.

[0102] The water-cooled wall tube 206 is connected with an inlet pipe 207 and a return pipe 208. Both the inlet pipe 207 and the return pipe 208 can be carbon steel pipes. Both the inlet pipe 207 and the return pipe 208 are equipped with a safety valve, a pressure gauge, a pressure transmitter, a flow meter, a thermometer, a manual gate valve, and an electric gate valve. The safety valve, the manual gate valve, and the electric gate valve can be used to control the opening and closing of the inlet pipe 207 and the return pipe 208. The pressure gauge can be used to monitor the pressure of the cooling water in the inlet pipe 207 and the return pipe 208. The thermometer can be used to monitor the temperature of the cooling water in the inlet pipe 207 and the recovery pipe, so as to judge the cooling effect of the corresponding heat exchange section 2011 on the slag.

[0103] The heat exchange section 2011 is connected to a dust extraction pipe 209, and the dust extraction pipe 209 is connected to an induced draft fan. Dust raised in the heat exchange section 2011 can be extracted through the dust extraction pipe 209; a pressure gauge and a manual ball valve are provided on the dust extraction pipe 209. The pressure gauge can be used to monitor the pressure in the dust extraction pipe 209, and the manual ball valve can be used to control the on-off of the dust extraction pipe 209.

[0104] See also Figure 3 , Figure 4 and Figure 5 The slag deceleration device includes a feed pipe 210 and a slag retaining ring 211. A plurality of feed pipes 210 are provided one by one corresponding to the heat exchange section 2011. The feed pipe 210 includes a first feed pipe 210 and an intermediate feed pipe 210.

[0105] One end of the first feed pipe 210 passes through the feed port of the first heat exchange section 2011 and is inserted into the first heat exchange section 2011, and another end is connected to the slag discharge port of the boiler, thereby realizing the connection between the first heat exchange section 2011 and the slag discharge port of the boiler. Specifically, the slag temperature monitoring device 203, the slag feed valve group 204 and the third expansion joint 205 are all arranged on the first feed pipe 210.

[0106] One end of the intermediate feed pipe 210 passes through the feed port of the corresponding heat exchange section 2011 and is inserted into the heat exchange section 2011 , and the other end is connected to the discharge port of the previous heat exchange section 2011 , thereby realizing the connection between adjacent heat exchange sections 2011 .

[0107] The feed pipe 210 includes a connecting section 2101, a bend guide section 2102, an inclined section 2103 and an outlet section 2104 which are connected in sequence. The connecting section 2101 is connected to the slag discharge port of the boiler. The bend pipe can guide the slag into the inclined section 2103. The bend guide section 2102 can reduce the impact of the slag. The tangent of the outlet end of the outlet section 2104 is perpendicular to the axis of the corresponding heat exchange section 2011. After the slag flows out from the outlet end, the flow direction of the slag can be perpendicular to the axis of the heat exchange section 2011, reducing the flow speed of the slag along the heat exchange section 2011.

[0108] The heat exchange section 2011 includes a drum 2012, both ends of the drum 2012 have openings, the openings at both ends of the drum 2012 are respectively the feed port of the heat exchange section 2011 and the discharge port of the heat exchange section 2011, and there is a stacking gap between the outlet section 2104 and the inner wall of the drum 2012. After the slag flows into the drum 2012 from the outlet end, a material pile can be formed in the stacking gap. When the drum 2012 is horizontal, the material pile is conical.

[0109] The slag deceleration device includes slag stop rings 211 arranged at intervals along the axial direction of the roller 2012. The slag stop rings 211 are coaxial with the roller 2012. The slag stop rings 211 can block the flow of the slag to slow down the flow speed of the slag in the heat exchange section 2011.

[0110] The distance between the discharge port of the outlet section 2104 and the inner wall of the heat exchange section 2011 is smaller than the radial height of the slag stop ring 211, which can prevent the slag flying out of the outlet section 2104 from directly crossing the slag stop ring 211, thereby ensuring the barrier effect of the slag stop ring 211 on the slag.

[0111] The heights of the multiple slag stop rings 211 are successively reduced along the conveying direction of the slag in the drum 2012 , so that the slag stop amounts of the multiple slag stop rings 211 are different, thereby ensuring the flow of the slag in the drum 2012 .

[0112] The maximum temperature of the slag can reach 800-850°C. The material of the heat exchange section 2011 and its internal components is preferably 310S or higher grade heat resistant material. The slag stop ring 211 is impacted by the slag and is prone to vibration. The slag stop ring 211 is directly welded to the inner wall of the heat exchange section 2011, and the slag stop ring 211 is not directly connected to the water-cooled wall tube 206, which reduces the damage to the water-cooled wall tube 206.

[0113] The heat exchange section 2011 includes a transmission gear 213 and a driving motor. The transmission gear 213 is rotatably installed. The driving motor is used to drive the transmission gear 213 to rotate. The outer peripheral side of the drum 2012 is meshed with the transmission gear 213. When the driving motor is started, the transmission gear 213 can drive the drum 2012 to rotate. When the drum 2012 rotates, the slag can be abutted against the outer side of the water-cooled wall tube 206, thereby achieving cooling of the slag.

[0114] See also Figure 2 and Figure 6 The slag conveying device 202 includes a chain bucket conveying device, and the slag conveying device 202 includes a first horizontal conveying section 2021, a first vertical conveying section 2022 and a second horizontal conveying section 2023. The first horizontal conveying section 2021, the first vertical conveying section 2022, and the second horizontal conveying section 2023 are integrally arranged to ensure the structural strength of the slag conveying device 202. The first horizontal conveying section 2021 is arranged at the bottom side of the first vertical conveying section 2022, and the second horizontal conveying section 2023 is arranged at the top of the first vertical conveying section 2022.

[0115] The first horizontal transmission section 2021 is provided with a plurality of charging ports 214 in sequence along the extension direction of the first horizontal transmission section 2021, and the charging ports 214 are connected to the discharge port of the tail heat exchange section 2011. By providing a plurality of charging ports 214, it is convenient to connect a plurality of heat exchangers 201. The slag after the temperature of the heat exchanger 201 is cooled enters the charging port 214, and then passes through the first horizontal transmission section 2021, the first vertical transmission section 2022, and the second horizontal transmission section 2023, so that the slag can be transported from a low place to a high place.

[0116] A discharge port 215 is disposed at the end of the second horizontal section, and the slag in the second horizontal section can flow out from the discharge port 215 .

[0117] The discharge port 215 is located at the upper side of the feed port of the screening machine 101 , and the discharge port 215 and the feed port of the screening machine 101 can be connected through a pipeline, so that the slag in the second horizontal transmission section 2023 is delivered into the screening machine 101 .

[0118] A driving device 216 is disposed at the bottom side of the second horizontal transmission section 2023 , and the driving device 216 is used to drive the slag transmission device 202 to transport the slag.

[0119] The first horizontal transmission section 2021, the first vertical transmission section 2022 and the second horizontal transmission section 2023 are all provided with dust collecting ports 218 at intervals, and the dust collecting ports 218 are connected to the factory negative pressure dust extraction duct 209. By sucking the dust of the slag in the slag transmission device 202, the slag escaping from the slag transmission device 202 can be reduced.

[0120] A return material scraper 217 is arranged on the bottom side of the second horizontal transmission section 2023, and the return material scraper 217 includes a horizontal scraping section 2171 and an arc-shaped return material section 2172. The horizontal scraping section 2171 is arranged along the transmission direction of the first horizontal transmission section 2021, and the arc-shaped return material section 2172 is located at one end of the first horizontal transmission section 2021 away from the first vertical transmission section 2022, and the discharge port of the arc-shaped return material section 2172 is connected to one of the loading ports 214.

[0121] The horizontal scraping section 2171 can be used to scrape the slag that falls to the bottom side of the first horizontal transmission section 2021, and send the slag into the charging port 214 through the arc-shaped return section 2172, thereby reducing the slag accumulated at the bottom of the first horizontal transmission section 2021.

[0122] In the embodiment of the present invention, the slag is cooled by setting a heat exchanger 201, and then the slag is transferred to the screening machine 101 through the slag conveying device 202, and then the slag is processed to a predetermined particle size through the grinder 102, and sent to the pneumatic conveying pipeline 107 through the sending tank 103, thereby realizing the pneumatic conveying of the slag.

[0123] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pneumatic conveying device for conveying slag to a comprehensive utilization point, characterized in that: include: A screening machine having a discharge port below the screen and a discharge port above the screen, wherein the feed port of the screening machine is used to connect to the slag transmission device; A mill, wherein the feed inlet of the mill is connected to the discharge outlet on the screen; At least one sending tank, the under-screen discharge port and the discharge port of the mill are both connected to the feed port of at least one sending tank; At least a first switch valve group, at least one of the first switch valve groups is arranged in one-to-one correspondence with at least one of the sending tanks, and the first switch valve group is arranged on the feed port of the corresponding sending tank; A compressed air pipeline, wherein the air inlet of at least one of the sending tanks is connected to the compressed air pipeline; At least one air intake valve group, at least one of the air intake valve groups is arranged corresponding to the air intake port of the sending tank, and the air intake valve group is arranged on the corresponding air intake port of the sending tank; A pneumatic conveying pipeline, wherein the discharge port of at least one of the sending tanks is connected to the pneumatic conveying pipeline; and The pneumatic conveying valve group is arranged on the pneumatic conveying pipeline.

2. The pneumatic conveying device according to claim 1, characterized in that: At least one of the sending tanks includes two sending tanks, one of which is connected to the under-screen discharge port, and the other of which is connected to the discharge port of the mill.

3. The pneumatic conveying device according to claim 1, characterized in that: The pneumatic conveying device also includes at least one pressure balance bin, which is arranged in a one-to-one correspondence with the sending tank. The under-screen discharge port and the discharge port of the grinder are both connected to the feed port of at least one pressure balance bin, and the discharge port of the pressure balance bin is connected to the corresponding feed port of the sending tank. A pressure balance component is arranged between the pressure balance bin and the sending tank, and the pressure balance component is used to adjust the pressure in the pressure balance bin to be the same as that of the sending tank.

4. The pneumatic conveying device according to claim 2, characterized in that: The pressure balance component includes an exhaust pipe and an exhaust valve group arranged on the exhaust pipe, and the feed port of the pressure balance bin is provided with a second switch valve group.

5. The pneumatic conveying device according to claim 1, characterized in that: The pneumatic conveying device also includes at least one buffer bin, the feed port of at least one sending tank is connected to the discharge port of the buffer bin, and the under-screen discharge port and the discharge port of the mill are both connected to the feed port of at least one buffer bin.

6. The pneumatic conveying device according to claim 1, characterized in that: A blowing-assisting pipe is connected between the compressed air pipeline and the pneumatic conveying pipeline.

7. A slag treatment system, characterized in that: Comprising the pneumatic conveying device according to any one of claims 1 to 6.

8. The slag treatment system according to claim 7, characterized in that: The slag treatment system further comprises: A heat exchanger, wherein the feed port of the heat exchanger is used to connect to the slag discharge port of the boiler; and A slag conveying device, wherein the feed port of the slag conveying device is connected to the discharge port of the heat exchanger, and the discharge port of the slag conveying device is connected to the feed port of the screening machine.

9. The slag treatment system according to claim 8, characterized in that: The heat exchanger comprises at least two heat exchange sections connected end to end.

10. The slag treatment system according to claim 9, characterized in that: A slag deceleration device is arranged in the heat exchange section.

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