Material spreading device of belt type decarburization machine

Abstract

The utility model relates to the technical field of coal gangue sintering treatment equipment, and particularly discloses a spreading device of a belt type decarburization machine, which comprises a raw material bin and a distributor, an aerator pipe parallel to the running direction of a grate trolley is arranged in the grate trolley positioned below the distributor, and the outer end part of the aerator pipe is connected with a heat exchanger; the heat exchanger is connected with an air feeder for supplying air to the aeration pipe through a pipeline; a smoke exhaust pipe is connected to the draught hood located below the grate trolley in the calcining section, an exhaust fan is connected to the end of the smoke exhaust pipe, and the exhaust end of the exhaust fan is connected with the high-temperature medium inlet end of the heat exchanger through a pipeline. According to the utility model, the waste heat of high-temperature flue gas of the calcining section can be utilized, so that the coal gangue with the original water content of about 7% before ignition is dried until the water content is lower than 5%, the ignition time of the coal gangue is shortened, the gas consumption during ignition is reduced, and a coal gangue material layer is looser and has a higher ventilation effect; and air draft calcination of the calcination section is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gangue sintering processing equipment, and particularly discloses a belt-type decarbonization machine paving device. Background Art

[0002] Gangue sintering and decarbonization is an important method for utilizing gangue solid waste. It can transform gangue into a new building material with a certain degree of activity and stability. Existing gangue decarbonization and sintering equipment mainly includes vertical sintering kilns and belt decarbonization sintering machines. Belt decarbonization sintering machines offer advantages over vertical sintering kilns, such as higher production capacity and lower energy consumption.

[0003] For example, the utility model patent with application number 202320259247X discloses a self-heating thick layer coal gangue decarbonization device, which includes a thick layer decarbonization trolley arranged on a track and a bellows arranged under the track, and is divided into a decarbonization section and a cooling section in sequence along the running direction of the thick layer decarbonization trolley; in addition, it also includes a feeding silo, the feeding silo includes a bottom silo and a mixing silo, a distribution device between the feeding silo and the thick layer decarbonization trolley, and a breathable rod is arranged under the distribution device. The self-heating thick-bed gangue decarbonization device disclosed in this utility model patent is a belt-type decarbonization sintering machine. Although a ventilation rod is provided below the distribution device, and external air is introduced into the material layer through the ventilation rod, thereby achieving the effect of enhancing air permeability while reducing material accumulation, the moisture content of the gangue material is generally controlled at about 7% to be made into granules for the equipment to perform decarbonization sintering. The higher moisture content causes not only excessive gas consumption during the gangue ignition process, but also a corresponding increase in ignition time. Therefore, based on the technical deficiencies in the existing belt-type decarbonization sintering machine in the process of decarbonization sintering of gangue, this application proposes a belt-type decarbonization machine spreading device, which can make full use of the waste heat of the high-temperature flue gas in the process of gangue decarbonization sintering, and then introduce it into the gangue silo during the spreading process after heat exchange, so as to achieve preheating and drying of the gangue while ensuring the ventilation effect of the gangue silo. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the existing belt decarbonization sintering machine, which is unable to preheat and dry the coal gangue material layer during the paving process, resulting in a high water content of the coal gangue material layer before ignition, resulting in a long subsequent ignition time and a large amount of fuel consumed in ignition.

[0005] The utility model is realized through the following technical solutions:

[0006] A belt decarbonizer paving device includes a raw material bin and a distributor, the distributor is arranged below the raw material bin, an aeration pipe is provided in a grate trolley located below the distributor and arranged parallel to the running direction of the grate trolley, and a row of aeration holes is provided on the lower surface of the aeration pipe, the outer end of the aeration pipe is connected to a heat exchanger, and the heat exchanger is connected to a blower for supplying air to the aeration pipe through a pipeline;

[0007] A fume exhaust pipe is connected to the exhaust hood below the grate trolley in the calcining section, an exhaust fan is connected to the end of the fume exhaust pipe, and the exhaust end of the exhaust fan is connected to the high-temperature medium inlet end of the heat exchanger through a pipeline.

[0008] As a further configuration of the above solution, a plurality of aeration pipes are arranged side by side, and the distance between the plurality of aeration pipes and the bottom wall of the grate trolley is set between 200-400 mm.

[0009] As a further configuration of the above solution, the thickness of the coal gangue layer paved on the grate trolley is set between 900-1100 mm.

[0010] As a further configuration of the above solution, the high-temperature medium outlet end of the heat exchanger is connected to the flue gas treatment equipment through a pipeline.

[0011] As a further configuration of the above solution, a circular roller feeder is provided at the lower end of the raw material bin, and the distributor is a roller-type distributor provided below the circular roller feeder.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The belt decarbonization machine paving device disclosed in the present invention exchanges heat between the high-temperature flue gas generated during the decarbonization and sintering process and the cold air sent in by the blower by setting a heat exchanger. The hot air after the heat exchange is then discharged from the aeration holes on the lower surface of the aeration pipe. When the paving device evenly spreads the gangue material on the grate trolley, the high-temperature gas can flow from bottom to top and fully contact the gangue material layer, so that the gangue raw material itself is heated and preheated. Ultimately, the gangue with an original moisture content of about 7% before ignition can be dried to a moisture content of less than 5%. The preheated and dried gangue can be ignited faster during subsequent ignition, thereby reducing the gas consumption during ignition. In addition, the high-temperature gas can make the gangue material layer looser and more breathable during the upward flow, which is more conducive to the exhaust calcination in the calcination stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 these drawings without creative work.

[0015] Figure 1 This is a schematic diagram of the planar structure of Example 1 of the present utility model;

[0016] Figure 2 For this utility model Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0017] Figure 3 It is a side plan view of the structure of the aeration pipe and the grate bar trolley in the present invention when they are coordinated. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1-3 , and describes the application in detail with reference to embodiments. Example 1

[0020] Example 1 discloses a material spreading device for a belt decarburizer, which is described in conjunction with the entire belt decarburizer. The belt decarburizer unit 1 includes a horizontally arranged track box 101, and the upper end of the track box 101 is open. This allows external air to be drawn downward through the material layer during the sintering process, thereby providing sufficient oxygen for decarburization and sintering.

[0021] A driving roller 102 is rotatably provided at each of the left and right ends of the track box 101, and one of the driving rollers 102 is connected to a driving motor 103 via a chain. A belt conveyor 104 is provided between the two driving rollers 102, and a plurality of grate trolleys 105 are evenly spaced along the periphery of the belt conveyor 104. The rollers at the front and rear ends of the grate trolleys 105 interact with the closed-loop track on the track box 101, and the grate trolleys 105 are connected to the belt conveyor 104. Under the driving action of the belt conveyor 104, all the grate trolleys 105 can move uniformly at a set speed from the material laying unit 2 to one side of the unloading and crushing unit.

[0022] Below the upper row of grate trolleys 105, side-by-side exhaust hoods 106 are installed, with their upper openings facing the lower surface of the grate trolleys 105. The upper exhaust hoods 106 are all located in the calcining section of the belt decarburizer. Each exhaust hood 106 is also equipped with a branch pipe extending laterally from the track box 101 at its lower end. The branch pipes converge and are connected to the exhaust fan 107 via a pipe. Furthermore, an ignition device 108 is installed on the side near the material laying unit 2, facing the surface of the material layer in the grate trolleys 105.

[0023] The material spreading device in this embodiment is located directly above one end of the track box 101 and includes a silo 201 and a roller distributor 202. A roller feeder is installed at the lower outlet of the silo, and the roller distributor 202 is positioned below the roller feeder, directly above the travel path of the grate trolley 105. When the grate trolley 105 circulates and moves directly below the roller distributor, the roller feeder is activated, and the roller distributor evenly spreads the gangue material onto the grate trolley 105, controlling the material layer thickness to between 950 and 1100 mm.

[0024] An aeration tube 203 is installed in the grate trolley directly below the roller distributor 202, parallel to the direction of the grate trolley's operation. Specifically, multiple aeration tubes 203 are arranged side by side, and a row of aeration holes is opened on the lower surface of each aeration tube 203. The distance between the aeration tube 203 and the bottom wall of the grate trolley 105 is controlled to be between 200-400mm to prevent the hot air discharged from the aeration tube 203 from being discharged through the gap at the bottom of the grate trolley 105. At the same time, it is also necessary to ensure that the hot air can fully contact the majority of the upper coal gangue layer when flowing from bottom to top, thereby achieving preheating and drying of the coal gangue layer.

[0025] The outer ends of all aeration tubes 203 are gathered together through a pipeline and connected to a gas heat exchanger 204. Then, a blower 205 is connected to the other end of the gas heat exchanger 204 through a pipeline, so that the blower 205 sends low-temperature air into the gas heat exchanger 204. After heat exchange, the air enters the aeration tube 203 and is finally discharged from the aeration hole at the bottom of the aeration tube 203 and enters the coal gangue material layer of the grate trolley 105.

[0026] A pipe is connected to the high-temperature medium inlet end of the gas heat exchanger 204, and the end of the pipe is connected to the exhaust end of the exhaust fan 107. In the specific design, part of the high-temperature flue gas discharged by the exhaust fan 107 can be passed into the gas heat exchanger 204 according to the demand of the gas heat exchanger 204, or all the discharged high-temperature flue gas can be passed into the gas heat exchanger 204, so that the high-temperature airflow can heat exchange and heat the low-temperature air sent in by the blower 205 after entering the gas heat exchanger 204.

[0027] Finally, the high-temperature medium outlet end of the gas heat exchanger 204 is connected to the flue gas treatment equipment through a pipeline. The specific flue gas treatment equipment includes a dust removal tower and a desulfurization and denitrification tower to ensure that the high-temperature flue gas discharged from the gas heat exchanger 204 can be effectively treated to avoid being directly discharged into the atmosphere and causing environmental pollution.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A belt decarbonizer material spreading device, comprising a raw material bin and a distributor, wherein the distributor is arranged below the raw material bin, and is characterized in that: An aeration pipe is provided in the grate trolley below the distributor and is arranged parallel to the running direction of the grate trolley. Aeration holes are provided on the lower surface of the aeration pipe. The outer end of the aeration pipe is connected to a heat exchanger, and the heat exchanger is connected to a blower for supplying air to the aeration pipe through a pipeline. A fume exhaust pipe is connected to the exhaust hood below the grate trolley in the calcining section, an exhaust fan is connected to the end of the fume exhaust pipe, and the exhaust end of the exhaust fan is connected to the high-temperature medium inlet end of the heat exchanger through a pipeline.

2. The belt decarbonizer paving device according to claim 1, characterized in that: A plurality of aeration pipes are arranged side by side, and the distance between the plurality of aeration pipes and the bottom wall of the grate trolley is set between 200-400 mm.

3. The belt decarbonizer paving device according to claim 2, characterized in that: The thickness of the coal gangue material layer paved on the grate trolley is set between 900-1100 mm.

4. The belt decarbonizer paving device according to claim 1, characterized in that: The high-temperature medium outlet end of the heat exchanger is connected to the flue gas treatment equipment through a pipeline.

5. The belt decarbonizer paving device according to claim 1, characterized in that: A round roller feeder is provided at the lower end of the raw material bin, and the distributor is a roller-type distributor provided below the round roller feeder.

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