CN118463591B - A coal gangue belt sintering decarbonization system - Google Patents

Abstract

The invention relates to the technical field of coal gangue processing, and specifically discloses a coal gangue belt sintering and decarbonization system, comprising a belt sintering and decarbonization unit, a material laying unit and a unloading and crushing unit, wherein the belt sintering and decarbonization unit comprises a grate trolley which circulates along a track box, an exhaust hood is arranged below an upper row of grate trolleys, the lower ends of all the exhaust hoods are connected to an exhaust fan through pipelines, and all the grate trolleys above the exhaust hoods are arranged in a calcining section; a grate cooling unit is arranged at the lower end of a discharge port of a unloading bin, the grate cooling unit comprises an outer shell and a cooling air system, a first step section and a second step section which are displaced up and down are arranged inside the outer shell, and a pair of roller crushers are arranged at the staggered positions of the first step section and the second step section; the coal gangue belt sintering and decarbonization system disclosed by the invention effectively improves the coal gangue processing efficiency, reduces the energy consumption in the entire coal gangue processing process, and has the positive significance of energy saving and emission reduction.

Description

A coal gangue belt sintering decarbonization system

Technical Field

The invention relates to the technical field of coal gangue processing, and in particular discloses a coal gangue belt sintering decarbonization system.

Background Art

When using traditional vertical kilns to sinter and decarbonize coal gangue, there are problems such as small processing scale, low decarbonization efficiency, and high energy consumption. At present, relevant patents have disclosed the use of belt sintering machines for decarbonization sintering of coal gangue. Although it can improve the decarbonization efficiency of coal gangue to a certain extent, it still has problems such as limited processing efficiency, high energy consumption, and poor product performance.

For example, the utility model patent with application number 202320259247X discloses a self-heating thick layer coal gangue decarbonization device, including a thick layer decarbonization trolley arranged on a track and a bellows arranged under the track. It is divided into a decarbonization section and a cooling section along the running direction of the thick layer decarbonization trolley. A partition is provided between the bellows at the corresponding position of the decarbonization section and the bellows at the corresponding position of the cooling section. The bellows at the corresponding position of the decarbonization section are connected to the decarbonization flue arranged below, and the bellows at the corresponding position of the cooling section are connected to the cooling flue arranged below. During operation, the gangue decarbonization device disclosed in the device needs to be divided into a decarbonization section and a cooling section in the direction of the trolley movement. Two exhaust systems independently exhaust the trolleys moving through the decarbonization section and the cooling section, respectively, and the fan power of the cooling section needs to be set to be larger to ensure that the cooling airflow can quickly pass through the sintering material layer to achieve effective cooling. This not only leads to an increase in the power loss of the entire equipment, but also due to the existence of the cooling section, either the length of the equipment can only be increased, or the running speed of the trolley can only be reduced to ensure that the gangue decarbonization on the trolley has sufficient sintering time.

Another example is the invention patent with application number 2022223101810, which discloses a gangue step-by-step sintering, decarburization and cooling system, including a step-by-step sintering machine and a vertical furnace cooling device. The vertical furnace cooling device includes a vertical furnace body, and the device also includes a receiving mechanism, a cooling mechanism and a discharging mechanism arranged in sequence from top to bottom. Compared with the above patents, although this patent does not set a cooling section in the direction of the sintering track, the gangue on the trolley is directly processed by a single-roll crusher after sintering and then put into the vertical furnace cooling device for cooling and cooling, which improves the sintering and decarburization efficiency of the gangue under the premise of the same equipment size and reduces the energy consumption of the fan. However, when the gangue after sintering is broken from the trolley and falls into the vertical furnace, the rapid increase in ventilation volume can easily cause the remaining latent heat of the inner layer of gangue to be quickly released again to form red-temperature materials. The viscosity of gangue is relatively high in the red-temperature state, which causes the broken gangue sintering material to agglomerate again. The agglomerated gangue sintering material not only reduces the cooling speed, which can easily cause the furnace body to be blocked, but also the particle size of the product after cooling is too large and the product activity is poor. Therefore, in view of the shortcomings of the above-mentioned existing step-type or belt-type gangue decarbonization sintering devices, this application proposes a gangue belt sintering decarbonization system that can effectively solve the above-mentioned technical problems.

Summary of the invention

The purpose of the present invention is to provide a coal gangue belt sintering and decarbonization system to solve the technical problems of limited decarbonization efficiency, high operating cost and easy secondary agglomeration during crushing and cooling in the existing belt or step-type sintering machines during the sintering and decarbonization of coal gangue.

The present invention is achieved through the following technical solutions:

A coal gangue belt sintering decarburization system, comprising a belt sintering decarburization unit, a material laying unit and a material discharging and crushing unit, wherein the material laying unit and the material discharging and crushing unit are respectively arranged at two ends of the belt sintering decarburization unit, wherein the belt sintering decarburization unit comprises a grate trolley cyclically moving along a track box, and an exhaust hood is arranged below the upper row of grate trolleys, and the lower ends of all the exhaust hoods are commonly connected to an exhaust fan through a pipeline, and all the grate trolleys located above the exhaust hoods are arranged in a calcining section;

The unloading and crushing unit comprises a unloading bin connected to the track box, a single hammer crusher and a triple roller crusher are respectively arranged at the upper and lower ends of the unloading bin, and a grate cooling unit is arranged at the lower end of the discharge port of the unloading bin;

The grate cooling unit comprises an outer shell and a cooling air system. A first step section and a second step section which are staggered up and down are arranged inside the outer shell. A pair of roller crushers are arranged at the staggered position of the first step section and the second step section.

An ignition device is arranged above the grate bar trolley near one side of the material laying unit, and a hot air mixer is arranged in the ignition device. The high-temperature flue gas in the grate cooling unit is connected to the hot air mixer through a heat exchanger.

During the operation of the coal gangue belt sintering and decarbonization system disclosed in the present invention, the grate trolley circulates at a set speed in the track box. When the grate trolley moves to the bottom of the material laying unit, the material laying unit evenly lays the granulated coal gangue in the grate trolley, and controls the thickness of the coal gangue material layer laid in the grate trolley to be between 950 and 1100 mm.

Subsequently, when the grate trolley is moved out from under the material laying unit, the ignition device is directly started to ignite the upper surface of the gangue material layer on the grate trolley to ensure that the surface of the gangue material layer can be fully ignited. In addition, the ignition device in the present invention uses the high-temperature flue gas generated during the cooling process of the gangue to heat the air to above 200°C, and then passes the high-temperature air into the hot air mixer to be fully mixed with the gas, and then ignites the gangue after mixing, thereby greatly improving the ignition speed of the gangue, and at the same time, the gas consumption during the ignition process can be effectively reduced.

After ignition is completed, the grate trolley is moved to the calcining section, and then the grate trolley is in the calcining section during the subsequent sintering and decarbonization process of the coal gangue. Under the action of the exhaust fan, the exhaust hood under the grate trolley generates a negative pressure of about 10~13KPa, so that the external air can flow downward from the upper surface of the coal gangue on the grate trolley, realizing the sintering process of the coal gangue material layer from top to bottom, until all the coal gangue on the grate trolley is sintered.

After sintering, the high-temperature sintered material is directly turned over by the grate trolley and enters the discharge bin. The high-temperature material layer on the grate trolley is first crushed and removed by a single hammer crusher, and the particle size of the high-temperature sintered material after the single hammer crushing can be effectively controlled between 0 and 25 mm. Then, the high-temperature sintered material is crushed for the second time by a three-roll crusher, so that the particle size of the material discharged from the discharge bin is controlled between 0 and 8 mm.

After two crushings, the high-temperature sintered scraps enter the first step of the grate cooling unit at a high temperature of about 500~600℃. At this time, due to the rapid increase in the contact area between the high-temperature sintered scraps and the cooling air after crushing, the latent heat remaining in the high-temperature sintered scraps is quickly released, causing it to first heat up to about 600~700℃ to form red-temperature materials. The sintered scraps in the red-temperature state will agglomerate again due to the increase in viscosity, and finally the temperature drops to 300~400℃ after cooling in the first step.

When the agglomerated sintered material falls from the first step, it is crushed again by the roller crusher and then falls into the second step for secondary cooling. At this time, since the agglomerated material is crushed to a particle size of 0-8 mm, it can not only accelerate the secondary cooling speed of the material in the second step and improve the activity of the product after cooling, but also the particle size of the cooled material meets the product requirements, and finally the temperature discharged from the grate cooling unit is controlled to be above 60℃ from room temperature.

As a further configuration of the above scheme, the high-temperature medium inlet end of the heat exchanger is connected to the grate cooling unit through a pipeline, the low-temperature air inlet end of the heat exchanger is connected to a blower, and the high-temperature air outlet end of the heat exchanger is connected to a hot air mixer through a pipeline. The above-mentioned heat exchanger allows the low-temperature air introduced into the hot air mixer to first exchange heat with the high-temperature flue gas generated during the operation of the grate cooling unit, so that the air is heated to above 200°C before being introduced into the hot air mixer to mix with the fuel gas. The mixed ignition mixture can not only accelerate the speed at which the gangue is ignited, but also greatly reduce the consumption of fuel gas during the ignition process.

As a further configuration of the above scheme, an aeration pipe parallel to the running direction of the grate trolley is provided in the grate trolley located below the material laying unit, and aeration holes are provided on the lower surface of the aeration pipe, and the end of the aeration pipe is connected to the high-temperature air outlet of the heat exchanger through a pipeline. The design of the aeration pipe can also use the heat exchanger to heat the low-temperature air, and then discharge part of the hot air from the aeration holes at the lower end of the aeration pipe. After being discharged, this part of the hot air can loosen the material and preheat and dry the coal gangue layer laid on the grate trolley, which not only reduces the ventilation resistance in the subsequent coal gangue decarbonization and sintering process, but also the moisture content of the coal gangue after preheating and drying can be reduced from the original 7% to below 5%, thereby reducing the subsequent ignition time and gas consumption.

As a further configuration of the above scheme, the thickness of the gangue material layer in the grate trolley is controlled between 950-1100 mm, and the aeration pipe is arranged at a distance of 200-400 mm from the bottom wall of the grate trolley. The design of the thickness of the gangue material layer and the design of the position of the aeration pipe can ensure that the upper layer of the material is fully contacted as much as possible without high-temperature air flowing out from the bottom of the grate trolley.

As a further configuration of the above scheme, the driving system of the single hammer crusher is provided with a monitoring module for detecting the operating current and a control module for controlling the forward and reverse rotation of the single hammer crusher. The design of the driving system of the single hammer crusher can detect the jamming of the material in the first time during the crushing and unloading process, and then the hard-to-crush sintered material can be smoothly removed from the trolley by the reverse driving of the single hammer crusher.

As a further configuration of the above scheme, the material spreading unit includes a silo and a roller distributor, a round roller feeder is arranged at the lower end discharge port of the silo, and the roller distributor is arranged below the round roller feeder.

As a further configuration of the above scheme, the belt sintering decarbonization unit also includes driving rollers arranged along both ends of the track box, and one of the driving rollers is connected to a driving motor, a belt conveyor is arranged between the two driving rollers, and a plurality of the grate trolleys are connected to the belt conveyor at equal intervals.

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

The coal gangue belt sintering decarbonization system disclosed in the present invention adopts a belt sintering decarbonization unit with a full calcination section, abandoning the traditional way of dividing the belt sintering decarbonization unit into a decarbonization section and a cooling section along the running direction. Under the premise of the same size of the belt sintering decarbonization unit, the coal gangue material can have a longer calcination section length under the transportation of the grate trolley. Therefore, under the premise of the same sintering decarbonization effect, the moving speed of the grate trolley can be increased, so that the coal gangue decarbonization efficiency is effectively improved.

Since the belt sintering decarbonization unit in the present invention adopts a full calcination section design, only one exhaust system needs to be set up to exhaust air to provide oxygen during the gangue sintering decarbonization process. In addition, the fan power required for the operation of the grate cooling unit is much lower than the fan power for online exhaust and cooling of the belt sintering decarbonization unit, so the power loss during the operation of the entire equipment is effectively reduced.

The grate cooling unit in the present invention adopts a first step section and a second step section that are staggered up and down, and a roller crusher structure design between the two, which can not only effectively improve the cooling rate of the crushed material and improve the activity of the prepared product, but also the design of the roller crusher can crush the re-agglomerated material again, avoiding the problem of red-temperature bonding of the crushed material fed from the unloading crushing unit due to the rapid release of latent heat when entering the cooling unit, ensuring that the particle size of the final prepared product meets the requirements and avoiding problems such as material discharge blockage and bonding.

The present invention also makes full use of the waste heat of the high-temperature flue gas generated in the grate cooling unit. The cold air is first heated by a heat exchanger, and then the heated hot air is introduced into the hot air mixer as a combustion-supporting gas for the ignition device to mix with the fuel gas. The high-temperature ignition mixed gas can not only increase the ignition speed of the coal gangue, but also effectively reduce the consumption of fuel gas during the ignition process. On the other hand, the hot air is discharged from the aeration pipe during the material laying process, which not only makes the high-temperature hot air looser and reduces the ventilation resistance in the subsequent sintering and decarbonization process, but also can realize the preheating and drying of the coal gangue before ignition, further reducing the fuel gas consumption in the subsequent ignition process and reducing the operating cost of the entire equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

FIG1 is a schematic diagram of a planar structure of Embodiment 1 of the present invention;

FIG2 is a schematic diagram of a planar structure of Embodiment 2 of the present invention;

FIG3 is a schematic diagram of the planar structure of the grate bar trolley and the aeration pipe in an embodiment of the present invention.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to Figures 1 to 3 and in combination with the embodiments.

Example 1

Embodiment 1 discloses a coal gangue belt sintering decarbonization system. Referring to Figures 1 and 2, the system includes a belt sintering decarbonization unit 1, a material laying unit 2, a discharge crushing unit 3 and a grate cooling unit 4. The material laying unit 2 and the discharge crushing unit 3 are respectively arranged at the two ends of the belt sintering decarbonization unit 1, and the grate cooling unit 4 is directly arranged at the lower end of the discharge port of the discharge crushing unit 3. In the process of coal gangue sintering decarbonization, the coal gangue raw materials after batching, mixing and granulation are laid on the grate bar trolley of the belt sintering decarbonization unit 1 by the material laying unit 2, and then directly enter the discharge crushing unit 3 for crushing and unloading after ignition and sintering decarbonization. The discharged sintered materials enter the grate cooling unit 4 for cooling, and finally a building material raw material with certain activity and stability is prepared.

The specific belt sintering decarburization unit 1 includes a horizontally arranged track box 101, and the upper end of the track box 101 is opened so that during the material sintering process, external air can be sucked downward through the material layer through the upper end opening, thereby providing sufficient oxygen for the gangue sintering decarburization process. A driving roller 102 is rotatably arranged 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 through a chain. A belt conveyor 104 is arranged between the two driving rollers 102, and then a plurality of grate trolleys 105 are arranged at equal intervals along the periphery of the belt conveyor 104, and the rollers at the front and rear ends of the grate trolley 105 interact with the closed-loop track on the track box 101, and the grate trolley 105 is connected to the belt conveyor 104 at the same time, so that under the driving action of the belt conveyor 104, all the grate trolleys 105 can be moved at a uniform speed from the material laying unit 2 to one side of the unloading and crushing unit 3 at a set speed.

Under the upper row of grate trolleys 105, exhaust hoods 106 are installed side by side, and the upper end opening of the exhaust hoods 106 is arranged facing the lower surface of the grate trolleys 105. At the same time, the lower end of each exhaust hood 106 is provided with a branch pipe extending laterally from the track box 101, and all the branch pipes are connected to an exhaust main pipe, and then an exhaust fan 107 is connected to the end of the exhaust main pipe. The high-temperature flue gas in the sintering process of coal gangue is successively sent to the dust removal tower and the desulfurization and denitrification tower for treatment through the exhaust fan 107. An ignition device 108 is also arranged on the side close to the material laying unit 2, and the ignition device 108 is arranged toward the surface of the material layer in the grate trolley 105.

The above-mentioned design of the belt sintering decarbonization unit 1 in the present embodiment 1 enables the entire upper grate trolley 105 from the ignition device 108 side to the discharge crushing unit 3 side to be in the calcining section, thereby effectively increasing the length of the entire calcining section under the premise of the same size compared with the existing belt sintering machine. Therefore, under the premise of ensuring the same sintering decarbonization effect, the moving speed of the grate trolley 105 can be increased, thereby achieving the purpose of improving the sintering decarbonization efficiency of coal gangue.

In addition, the entire belt sintering decarbonization unit 1 uses only one exhaust fan 107 to exhaust the grate trolley 105 in the calcining section, so that the external air flows from top to bottom through the material layer laid on the grate trolley 105, which can reduce the need for the existing belt sintering machine to set up a separate exhaust system for high-power exhaust in the cooling section to achieve the power loss caused by cooling the material layer, thereby reducing the operating cost of the entire belt sintering decarbonization unit 1.

The specific material spreading unit 2 includes a silo 201 and a roller distributor (not shown in the figure). A round roller feeder 202 is set at the discharge port at the lower end of the silo 201, and then the roller distributor is set below the round roller feeder 202, so that when the grate trolley moves to the bottom of the material spreading unit 2, the round roller feeder 202 is started to discharge the material evenly, and a coal gangue layer of uniform thickness can be formed on the grate trolley 105 after being processed by the roller distributor.

The specific unloading and crushing unit 3 includes a unloading bin 301 connected to the rear end of the track box 101, a single hammer crusher 302 is arranged at the upper end of the unloading bin 301, and a three-roll crusher 303 is arranged in the unloading bin 301 below the single hammer crusher 302. When the grate trolley 105 moves to the rear end for overturning, the high-temperature sintered material layer is first crushed and unloaded by the single hammer crusher 302, so that the particle size of the material is controlled between 0 and 25 mm, and then after the secondary crushing treatment by the three-roll crusher 303, the particle size of the material can be effectively controlled between 0 and 8 mm.

In the specific design, the single hammer crusher 302 is preferably made of Mn13Cr2 material, which has the characteristics of high temperature resistance and wear resistance, thereby reducing the damage caused by high-temperature sintered materials to the single hammer crusher 302, and the maximum power of the driving motor of the single hammer crusher 302 is set to no less than 90 kilowatts, so that the single hammer crusher 302 has a greater crushing capacity. In addition, in order to avoid the single hammer crusher 302 from getting stuck during the unloading process of the high-temperature sintered material layer, a monitoring module is also set in the driving system of the single hammer crusher 302. When it is found that the operating current of the single hammer crusher 302 is too large and exceeds a certain time, the control module in the driving system will control the single hammer crusher 302 to rotate in the opposite direction, and the material layer is crushed and unloaded under the reverse action of the single hammer crusher 302. After the jamming phenomenon is eliminated, it is adjusted to normal rotation for normal operation.

The material spreading unit 2 in this embodiment 1 includes a silo and a roller distributor. A round roller feeder is provided at the lower outlet of the silo, and the roller distributor is provided below the round roller feeder, and the roller distributor is located directly above the moving path of the grate trolley 105. When the grate trolley 105 moves cyclically to directly below the roller distributor, the round roller feeder is started, and the gangue raw materials in the silo are evenly spread in the grate trolley 105 through the roller distributor, and the material layer thickness is controlled to be between 950 and 1100 mm.

Finally, the grate cooling unit 4 in this embodiment 1 is an improved step-type grate cooler, which includes an outer shell 401 and a cooling air system (not shown in the figure), and a first step section 402 and a second step section 403 that are offset up and down are arranged inside the outer shell 401, and then a pair of roller crushers 404 are arranged at the staggered position of the first step section 402 and the second step section 403.

After being processed by the unloading and crushing unit 3, the high-temperature sintered scraps enter the first step of the grate cooling unit at a high temperature of about 500-600°C. At this time, the surface area of the high-temperature sintered scraps in contact with the cold air increases sharply, so that the latent heat in the high-temperature sintered scraps is quickly released, which causes the high-temperature sintered scraps to heat up to 600-700°C again to form red-temperature materials that are easy to bond. After cooling in the first step, the material is cooled to 300-400°C, but most of the material is agglomerated again due to the red-temperature state. Before entering the second step, this part of the agglomerated material is first crushed again by the roller crusher 404 to a particle size of 0-8mm, and then falls into the second step 403, so that the re-crushed material can have a larger heat exchange area with the cold air in the second step 403, so that it can be quickly cooled and cooled, improve the activity of the product, and finally make the temperature of the material sent out from the second step 403 not exceed 60°C above room temperature.

Example 2

Example 2 discloses a coal gangue belt sintering decarbonization system that is further optimized and modified based on the technical solution in Example 1. It is mainly designed to address the problems of slow ignition speed and excessive ignition gas consumption when the ignition device 108 ignites the coal gangue material layer on the grate table 105, and the effective utilization of the waste heat of high-temperature flue gas in the grate cooling unit 4.

This embodiment 2 is also provided with a set of high-temperature flue gas waste heat utilization equipment 5, which includes a heat exchanger 501 and a blower 502. The high-temperature medium inlet end of the heat exchanger 501 is connected to the top of the outer shell of the grate cooling unit 4 through an insulation pipe, so that the latent heat released by the high-temperature sintering material during the cooling process can enter the heat exchanger 501 in the form of high-temperature flue gas. At the same time, the high-temperature medium outlet end of the heat exchanger 501 uses an exhaust fan to transport the flue gas after passing through the heat exchanger 501 to the dust collector and the desulfurization and denitrification tower for treatment, ensuring that the flue gas emissions meet environmental protection standards.

The blower 502 is connected to the low-temperature air inlet of the heat exchanger 501 through a pipeline, and then a gas pipeline is connected to the high-temperature air outlet of the heat exchanger 501, and the gas pipeline is connected to the hot air mixer 109 in the ignition device 108. When the blower 502 is started to send low-temperature air into the heat exchanger 501, the low-temperature air completes heat exchange with the high-temperature flue gas in the heat exchanger 501, and the temperature is raised to above 200°C, and then the heated high-temperature air is introduced into the hot air mixer 109 to be fully mixed with the gas, and finally when the gangue on the grate trolley is ignited in the ignition device 108, the ignition mixed gas in the high-temperature state can quickly ignite the gangue, and at the same time can effectively reduce the use of gas.

In addition, in order to further fully utilize the waste heat of high-temperature flue gas and further reduce the consumption of fuel gas, a plurality of aeration pipes 503 are provided in the grate trolley 105 below the material laying unit 2, and the aeration pipes 503 are provided parallel to the running direction of the grate trolley 105. A row of aeration holes is provided on the lower surface of each aeration pipe, and the end of the aeration pipe 503 is also connected to the high-temperature air outlet of the heat exchanger 501 through a pipeline, so as to achieve the high-temperature air diversion effect. During the process of the laying unit 2 laying the material on the grate trolley, the high-temperature air after heat exchange and temperature rise can be continuously discharged from the bottom of the aeration pipe 503, and the discharged high-temperature air can flow from bottom to top. On the one hand, it can make the material on the grate trolley 105 looser, thereby reducing the ventilation resistance in the subsequent sintering and decarbonization process. On the other hand, the heat of the high-temperature air can be used to pre-dry the material before ignition, reducing the original moisture content of the coal gangue raw material from about 7% to below 5%, thereby shortening the ignition time of the subsequent ignition device 108, thereby reducing the consumption of ignition gas.

In addition, the aeration pipe 503 is designed for the 950-1100 mm thick coal gangue layer on the grate trolley 105, and is set at a position 200-400 mm away from the bottom wall of the grate trolley. Under the premise of ensuring that the high-temperature air does not flow out from under the grate trolley, the aeration pipe 503 can be in full contact with the upper material as much as possible, thereby improving the pre-drying effect of the high-temperature air on the coal gangue before ignition.

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

Claims (7)

1. The utility model provides a gangue belt sintering decarbonization system, includes belt sintering decarbonization unit, spreading unit and the broken unit of unloading set up respectively in the both ends of belt sintering decarbonization unit, belt sintering decarbonization unit includes along the grate trolley of track case circulation removal, the top a row of the below of grate trolley all is provided with the exhaust hood, its characterized in that, all the lower extreme of exhaust hood is connected with the air exhauster jointly through the pipeline, all the grate trolley that is located the exhaust hood top all is located and calcines the section and set up;

the discharging and crushing unit comprises a discharging bin communicated with the track box, wherein the upper end and the lower end of the discharging bin are respectively provided with a single hammer crusher and a three-roller crusher, and the lower end of a discharging hole of the discharging bin is provided with a grate cooling unit;

the grate cooling unit comprises an outer shell and a cooling air system, a first stepping section and a second stepping section which are staggered up and down are arranged in the outer shell, and a pair of roller crusher is arranged at the staggered position of the first stepping section and the second stepping section;

An ignition device is arranged above the grate bar trolley close to one side of the spreading unit, a hot air mixer is arranged in the ignition device, and high-temperature flue gas in the grate cooling unit is connected with the hot air mixer through a heat exchanger.

2. The gangue belt sintering decarburization system according to claim 1, wherein the high temperature medium inlet of the heat exchanger is connected to the grate cooling unit through a pipe, the low temperature air inlet of the heat exchanger is connected to a blower, and the high temperature air outlet of the heat exchanger is connected to the hot air mixer through a pipe.

3. The gangue belt sintering decarburization system as claimed in claim 2, wherein an aeration pipe parallel to the running direction of the grate carriage is arranged in the grate carriage below the spreading unit, an aeration hole is formed in the lower surface of the aeration pipe, and the end part of the aeration pipe is connected with the high temperature air outlet end of the heat exchanger through a pipeline.

4. A gangue belt sintering decarburization system as claimed in claim 3 wherein the thickness of the gangue layer in the grate carriage is controlled between 950-1100mm and the aeration pipe is provided at a position 200-400mm from the bottom wall of the grate carriage.

5. The gangue belt sintering decarburization system according to claim 1, wherein a monitoring module for detecting an operation current and a control module for controlling forward and reverse rotation of the single hammer break are provided in the single hammer break driving system.

6. The gangue belt sintering decarburization system as claimed in claim 1, wherein the spreading unit comprises a bin and a roller distributor, wherein a round roller feeder is arranged at a discharge port at the lower end of the bin, and the roller distributor is arranged below the round roller feeder.

7. The gangue belt sintering and decarburization system according to claim 1, wherein the belt sintering and decarburization unit further comprises driving rollers arranged at two ends of the track box, wherein one driving roller is connected with a driving motor, a belt conveyor is arranged between two driving rollers, and a plurality of grate carriages are connected to the belt conveyor at equal intervals.