Coal gangue particle production system

Abstract

The utility model relates to the technical field of coal gangue resource utilization, and particularly discloses a coal gangue particle production system which comprises a coal gangue powder bin and an additive powder bin, the discharge port of the coal gangue powder bin and the discharge port of the additive powder bin are both connected with the feed port of a pre-nucleating machine, the pre-nucleating machine is further connected with a water inlet pipeline, and the water inlet pipeline is connected with a water outlet of the pre-nucleating machine. The pre-nucleating machine is sequentially connected with a granulator, a dryer, a sintering kiln and a cooler through a material conveying line, the sintering kiln is connected with a burner, the burner is connected with a gas incoming pipe and an air incoming pipe, and an internal combustion decarbonization rotary kiln is arranged on the section of the material conveying line between the dryer and the sintering kiln. A hot air outlet of the sintering kiln is sequentially connected with the internal combustion decarbonization rotary kiln and the drying machine through a hot air pipeline, and the coal gangue powder bin, the additive powder bin, the drying machine, the combustor and the sintering kiln are all in control connection with the control system. The coal gangue is combusted and decarbonized in the internal combustion decarbonization rotary kiln, the decarbonization effect is thorough, and the quality and stability of products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gangue resource utilization, in particular to a gangue particle production system. Background Art

[0002] Gangue is solid waste generated during coal mining and washing. It is one of the solid wastes with the largest emission volume at present. It has the characteristics of volatile matter, high ash content, low calorific value, and difficulty in combustion. According to the data of the "2021-2022 China Bulk Industrial Solid Waste Comprehensive Utilization Industry Development Report", the output of gangue in my country in 2021 was about 743 million tons, a year-on-year increase of 5.84%, indicating that the amount of gangue produced is still gradually increasing, and the growth rate is relatively obvious. The resource utilization of gangue is of great significance to reducing pollution, improving ecological benefits, and reducing processing costs. Using gangue to process into granular products such as expanded clay is one of the ways to utilize gangue. The process is to grind the gangue and make it into granules with additives, and then obtain gangue granule products after drying, decarbonization, sintering and other heat treatment processes. Coal gangue contains a certain amount of carbon. The lower the carbon content of coal gangue particles, the better. The prior art generally reduces the carbon content of coal gangue particles by adding additives. For example, CN117209253A discloses a method for preparing lightweight ceramsite using coal gangue and solid waste. In this method, coal gangue powder is mixed with other powders, and then granulated, dried and roasted to obtain ceramsite balls. There is no separate decarbonization process, which has a certain impact on the stability of the ceramsite. Utility Model Content

[0003] The utility model aims to solve the problem that the decarbonization effect of particles produced by using coal gangue powder in the prior art is not ideal, and provides a coal gangue particle production system with more thorough decarbonization.

[0004] In order to solve the above technical problems, the utility model includes a coal gangue powder bin for feeding coal gangue powder and an additive powder bin for feeding additive powder, the discharge ports of the coal gangue powder bin and the additive powder bin are connected to the feed port of the pre-nucleating machine, the pre-nucleating machine is also connected to a water inlet pipeline, the pre-nucleating machine is connected to a granulator, a dryer, a sintering kiln and a cooler in sequence through a material conveying line, the sintering kiln is connected to a burner, the burner is connected to a gas pipe and an air pipe, and its structural features are: an internal combustion decarbonization rotary kiln is provided in the material conveying line section between the dryer and the sintering kiln, the hot air outlet of the sintering kiln is connected to the internal combustion decarbonization rotary kiln and the dryer in sequence through a hot air pipeline, the coal gangue powder bin, the additive powder bin, the dryer, the burner and the sintering kiln are all connected to the control system.

[0005] After adopting the above structure, when producing coal gangue particles, coal gangue powder enters the pre-nucleating machine from the coal gangue powder bin, additive powder enters the pre-nucleating machine from the additive powder bin in proportion, and water for powder bonding enters the pre-nucleating machine from the water inlet pipeline. The materials are mixed evenly in the pre-nucleating machine, the mixed materials enter the granulator for granulation, and the qualified material balls enter the dryer for drying. When the moisture content drops to a certain value, they enter the internal combustion decarbonization rotary kiln. The coal gangue particles are burned and decarbonized in the internal combustion decarbonization rotary kiln, which can be more thoroughly The carbon in the particles is removed, and the decarbonized coal gangue enters the sintering kiln. After the coal gangue particles are sintered and formed stably, they enter the cooler for cooling to obtain coal gangue particle products; the heat of the sintering kiln comes from the burner, and the heat generated by the combustion of gas and air sinter the coal gangue particles in the sintering kiln. After the hot air is discharged from the sintering kiln, it enters the internal combustion decarbonization rotary kiln and the dryer in turn through the hot air pipeline, and the heat in the hot air is used to burn, decarbonize and dry the coal gangue particles, making full use of the heat energy of the burner to save energy. The dryer is connected to the control system control, and the forward speed of the particles in the dryer is controlled by controlling the motor speed of the dryer to ensure that the moisture content after drying meets the requirements, and the injection rate of the coal gangue powder bin and the additive powder bin is controlled to balance the amount of particles entering and leaving the dryer; the temperature of the sintering kiln is adjusted to a suitable range by controlling the burner. The utility model provides a coal gangue particle production system comprising an internal combustion decarbonization rotary kiln. The coal gangue particles are burned and decarbonized in the internal combustion decarbonization rotary kiln, and the carbon in the coal gangue particles can be removed more thoroughly, thereby improving the stability of the product.

[0006] The control system is a DCS centralized control system.

[0007] The feed port of the gangue powder silo is connected to the discharge port of the gangue powder silo scale, the gangue powder silo scale is connected to the gangue powder silo pump via a powder conveying pipeline, the feed port of the additive powder silo is connected to the discharge port of the additive powder silo scale, and the additive powder silo scale is connected to the additive powder silo pump via a powder conveying pipeline.

[0008] The water inlet pipeline connected to the pre-nucleation machine is provided with a pressure-stabilizing water tank, a water metering pump and a first flow meter arranged in sequence along the water flow direction. The water metering pump is control-connected to the DCS centralized control system, and the first flow meter is signal-connected to the DCS centralized control system.

[0009] The exhaust gas outlet of the dryer is connected to the dust collector through an exhaust gas pipeline, and the dust collector is also connected to a main induced draft fan. The dryer is provided with a first temperature transmitter for detecting the internal temperature, and the exhaust gas pipeline is provided with a second temperature transmitter for measuring the flue gas temperature in the pipeline, and the first temperature transmitter and the second temperature transmitter are both connected to the DCS centralized control system by signal; the hot air pipeline section between the internal combustion decarbonization rotary kiln and the dryer is provided with a dryer air inlet fan for sending hot air into the dryer, a third temperature transmitter for detecting the temperature of the hot air sent into the dryer, and a second flow meter for detecting the flow rate of the hot air sent into the dryer, the dryer air inlet fan is a variable frequency fan, and the dryer air inlet fan is connected to the DCS centralized control system for control, and the third temperature transmitter and the second flow meter are both connected to the DCS centralized control system by signal.

[0010] The internal combustion decarbonization rotary kiln is provided with a first kiln temperature wireless detection system, the hot air pipeline section between the internal combustion decarbonization rotary kiln and the sintering kiln is connected to the decarbonization kiln air inlet and the hot air burner respectively through a gas pipeline, the gas pipeline connected to the air outlet of the decarbonization kiln air inlet is provided with a heat exchanger, a third flowmeter for detecting the pipeline gas flow rate and a fourth temperature transmitter for detecting the pipeline gas temperature, the heat exchanger is also connected to the hot air pipeline between the internal combustion decarbonization rotary kiln and the dryer, the hot air pipeline section between the internal combustion decarbonization rotary kiln and the dryer is also provided with a fifth temperature transmitter for detecting the flue gas outlet temperature of the internal combustion decarbonization rotary kiln, the first kiln temperature wireless detection system, the third flowmeter, the fourth temperature transmitter and the fifth temperature transmitter are all connected to the DCS centralized control system signal, and the decarbonization kiln air inlet and the hot air burner are all control-connected to the DCS centralized control system.

[0011] The internal combustion decarbonization rotary kiln is connected to an oxygen-enriching fan for supplementing oxygen content in the kiln through a pipeline. The oxygen-enriching fan is a variable frequency fan. The oxygen-enriching fan is control-connected to a PLC control module. The PLC control module is signal-connected to an industrial wireless remote controller for controlling the frequency of the oxygen-enriching fan.

[0012] The oxygen-enriching fan is connected to the inner wall of the decarburization kiln of the internal combustion decarburization rotary kiln at multiple points through multiple pipes. The pipe air outlets on the inner wall of the decarburization kiln are evenly distributed along the cross-section of the inner wall of the decarburization kiln. An electric switch valve is provided on each pipe connecting the oxygen-enriching fan to the inner wall of the decarburization kiln. The electric switch valve is connected to the PLC control module for control. The PLC control module is connected to a photoelectric switch signal for controlling the switch of the electric switch valve. The photoelectric switch and the electric switch valve are arranged in a one-to-one correspondence. The PLC control module is also connected to a receiver signal for receiving the photoelectric switch signal.

[0013] The sintering kiln is provided with a second kiln temperature wireless detection system, and the hot air pipeline section between the sintering kiln and the internal combustion decarbonization rotary kiln is provided with a sixth temperature transmitter for detecting the sintering kiln flue gas outlet temperature and a fourth flow meter for detecting the pipeline flue gas flow rate. The second kiln temperature wireless detection system, the sixth temperature transmitter and the fourth flow meter are all connected to the DCS centralized control system signal.

[0014] The cooler is connected to the cooler fan through a pipeline, the air outlet of the cooler is connected to the air pipe through a pipeline, and the material outlet of the cooler is sequentially connected to a conveyor belt, a screening machine, and a ton bag system through a material conveying line.

[0015] The utility model discloses a coal gangue particle production system. The coal gangue powder, additive powder and water are introduced into a pre-nucleating machine in proportion and mixed evenly, and then enter a granulator for granulation. Qualified material balls are dried in a dryer, decarbonized in an internal combustion decarbonization rotary kiln, sintered in a sintering machine, and then cooled to obtain a coal gangue particle product. The coal gangue particles are burned and decarbonized in the internal combustion decarbonization rotary kiln. During the decarbonization process, air is introduced to supplement the oxygen content in the kiln to improve the decarbonization effect, and the carbon content in the coal gangue particles can be reduced to 0, thereby improving the stability of the product. The hot air generated by the burner provides heat energy for the sintering kiln, the internal combustion decarbonization rotary kiln and the dryer, thereby saving energy consumption. The DCS centralized control system is used to control the production condition parameters such as the feed rate of raw materials, the production rate of coal gangue particles and the temperature of the heating equipment, thereby improving the degree of automation and ensuring the quality of the coal gangue particle products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the connection between some equipment and instruments in the system and the DCS centralized control system;

[0018] Figure 3 A schematic diagram of the structure for adding air and oxygen to the internal combustion decarbonization rotary kiln;

[0019] Figure 4 This is a schematic diagram of the connection between the internal oxygen-increasing structure of the internal combustion decarbonization rotary kiln and the PLC control module;

[0020] In the figure: 1. Gangue powder silo pump; 2. Additive powder silo pump; 3. Gangue powder silo scale; 301. First weighing sensor; 31. Air duct; 4. Additive powder silo scale; 401. Second weighing sensor; 5. Gangue powder silo; 6. Additive powder silo; 7. Pre-nucleating machine; 8. Granulator; 9. Pressure-stabilizing water tank; 91. Water pipe; 92. Water metering pump; 93. Normal pressure valve; 94. Pulse damper; 95. First flow meter; 10. Dryer; 101. Dryer air inlet fan; 102. First temperature transmitter; 11 , dust collector; 111, second temperature transmitter; 12, total induced draft fan; 13, internal combustion decarbonization rotary kiln; 131, feeder; 132, discharger; 133, first kiln temperature wireless detection system; 134, decarbonization kiln outer wall; 135, decarbonization kiln inner wall; 136, mixer; 14, heat exchanger; 141, decarbonization kiln air inlet fan; 142, third temperature transmitter; 143, second flow meter; 144, third flow meter; 145, first Fourth temperature transmitter; 146, fifth temperature transmitter; 15, hot air burner; 16, burner; 161, gas supply pipe; 162, air supply pipe; 163, air supply fan; 17, sintering kiln; 170, combustible gas detector; 171, second kiln temperature wireless detection system; 172, sixth temperature transmitter; 173, fourth flow meter; 18, cooler; 181, cooler fan; 19, conveyor belt; 20, screening machine; 21, ton bag system; 22, oxygen enrichment fan; 23, air main pipe; 23a, first electric switch valve; 23b, second electric switch valve; 23c, third electric switch valve; 24a, first photoelectric switch; 24b, second photoelectric switch; 24c, third photoelectric switch; 25, external air pipe; 26, internal air pipe; 27, receiver; 28, industrial wireless remote control; 100, DCS centralized control system; 200, PLC control module. DETAILED DESCRIPTION

[0021] Reference Figure 1-4A production system for gangue particles includes a powder feeding system, a powder batching system, a pre-nucleation and granulation system, a drying system, an internal combustion decarbonization system, a roasting system and a control system. The powder feeding system includes a gangue powder silo pump 1 for feeding gangue powder and an additive powder silo pump 2 for feeding additive powder. The additives for gangue particles can be fly ash, shale, etc., which are added as needed. The powder feeding equipment adopts a silo pump, that is, a silo pneumatic conveying pump, and its structure includes a hopper, a silo pump body, an inlet and outlet pipeline, a level meter, an inlet and outlet valve, an inlet and outlet air valve, a pressure transmitter, a blower, etc. Its structure and principle are prior art and are not described in detail here. The powder batching system includes a gangue powder silo scale 3 for temporary metering and storage of gangue powder and a gangue powder silo 5 for metering and feeding of gangue powder, and also includes an additive powder silo scale 4 for temporary metering and storage of additive powder and an additive powder silo 6 for metering and feeding of additive powder. The gangue powder silo scale 3 is provided with a first weighing sensor 301, and the additive powder silo scale 4 is provided with a second weighing sensor 401. The gangue powder silo scale 3 is connected to the gangue powder silo pump 1 through a powder conveying pipeline, and the additive powder silo scale 4 is connected to the additive powder silo pump 1 through a powder conveying pipeline. The additive powder silo is connected to the silo pump 2, and the silo scale controls the feeding of the silo pump by the weight of the material in the silo, which is a conventional means in this field and is not described in detail here; the gangue powder silo scale 3 and the additive powder silo scale 4 are both provided with pneumatic arch breaking, and the gangue powder silo scale 3 and the additive powder silo scale 4 are both connected to the air duct 31 for pneumatic arch breaking, and the gangue powder silo scale 3 and the additive powder silo scale 4 are both connected to a pipeline for discharging dust-containing exhaust gas, and the dust-containing exhaust gas is connected to the dust collector 11 described below via the pipeline. The structure and principle of the silo scale are existing technologies and are not described in detail here. The feed port of the gangue powder silo 5 is connected to the discharge port of the gangue powder silo scale 3, and the feed port of the additive powder silo 6 is connected to the discharge port of the additive powder silo scale 4. The gangue powder and additive powder are fed into the powder silo (i.e., a screw conveyor), which is a conventional means in the field. The powder silo can feed by weight, and the feeding amount can be adjusted by adjusting the rotation speed of the powder silo. Its structure and principle are existing technologies and are not described in detail here.

[0022] Reference Figure 1The pre-nucleation and granulation system includes a pre-nucleation machine 7 and a granulator 8. The discharge ports of the gangue powder bin 5 and the additive powder bin 6 are both connected to the feed port of the pre-nucleation machine 7. The pre-nucleation machine 7 is also connected to the water inlet pipeline. The gangue powder and the additive powder use water as a binder. The gangue powder, the additive powder and water are added in proportion and mixed evenly in the pre-nucleation machine 7. The water inlet pipeline is provided with a pressure-stabilizing water tank 9, a water metering pump 92, a normal pressure valve 93, and a first flow meter 95 which are arranged in sequence according to the water flow direction. The pressure-stabilizing water tank 9 is connected to a water pipe 91. The water inlet pipeline is also provided with a pressure-stabilizing circuit. The pressure-stabilizing circuit is provided with a pulse damper 94 for stabilizing the water pressure of the water inlet pipeline. The end of the pressure-stabilizing pipeline is connected to the pressure-stabilizing water tank 9. The pressure-stabilizing pipeline is also provided with accessories such as a safety valve. The pre-nucleating machine 7 is connected to the granulator 8 (i.e., the ball-forming disk) through a material conveying line. The material is made into material balls in the granulator 8. The structure and principle of the granulator 8 are existing technologies, for example, the ball-forming disk of CN220589913U can be used.

[0023] Reference Figure 1 The drying system includes a dryer 10. The granulator 8 is connected to the dryer 10 through a material conveying line. The dryer 10 uses hot air to dry the gangue particles. Its structure and principle are prior art, such as the dryer 10 disclosed in CN212720749U, which will not be described in detail here. The internal combustion decarbonization system includes an internal combustion decarbonization rotary kiln 13. The dryer 10 is connected to the internal combustion decarbonization rotary kiln 13 through a material conveying line. The feed port and the discharge port of the internal combustion decarbonization rotary kiln 13 are respectively provided with a feeder 131 and a discharger 132. The feeder 131 and the discharger 132 are of the prior art, and are spiral type, vibrating type and other types, so that the gangue particles can be evenly fed in and out. The structure of the internal combustion decarbonization rotary kiln 13 is similar to the sintering kiln 17 described below, except that the internal combustion decarbonization rotary kiln 13 uses hot air heating for decarbonization instead of flame heating. The temperature in the kiln is different. The gangue particles contain a certain amount of carbon so they can burn and are burned and decarbonized in the internal combustion decarbonization rotary kiln 13. The roasting system includes a sintering kiln 17. The internal combustion decarbonization rotary kiln 13 is connected to the sintering kiln 17 through a material conveying line. A burner 16 is provided at one end of the sintering kiln 17. The burner 16 is connected to a gas supply pipe 161 and an air supply pipe 162. The gas is used as fuel and the air assists combustion. The burner 16 is generally provided with a gas and air control valve, a regulating valve, an igniter, a flame signal detector, etc. The sintering kiln 17 adopts a rotary kiln, and its structure is the existing technology, such as the roasting rotary kiln disclosed in CN215983888U. The discharge port of the sintering kiln 17 is connected to the cooler 18, the conveyor belt 19, the screener 20, and the ton bag system 21 in sequence through the material conveying line. The cooler 18 cools the coal gangue particles coming out of the sintering kiln 17 and sends them to the screener 20 through the conveyor belt 19. After screening, particles of different particle sizes are packaged through the ton bag system 21. The cooler 18, the conveyor belt 19, the screener 20, and the ton bag system 21 are all existing technologies and are not described in detail here.

[0024] Reference Figure 1 The gangue particle production system also includes a pipeline system formed by the drying, decarbonization, roasting and cooling gas flow of the gangue particles. The cooler 18 is connected to the cooler fan 181 through a pipeline, and the air outlet of the cooler 18 is connected to the air supply pipe 162 through a pipeline. The air supply pipe 162 is also connected to the air supply fan 163, and the air supply fan 163 is used to supplement the combustion air to the air supply pipe 162. The flue gas outlet of the sintering kiln 17 is connected to the internal combustion decarbonization rotary kiln 13 through a hot air pipeline. A mixer 136 is provided on the hot air pipeline between the sintering kiln 17 and the internal combustion decarbonization rotary kiln 13. The mixer 136 is connected to the decarbonization kiln air inlet through a pipeline. The decarbonization kiln air inlet fan 141 adopts a variable frequency fan. A heat exchanger 14 is provided on the pipeline between the decarbonization kiln air inlet fan 141 and the mixer 136. When the air passes through the heat exchanger 14, it exchanges heat with the hot air discharged from the internal combustion decarbonization rotary kiln 13 to increase the temperature, and then enters the internal combustion decarbonization rotary kiln 13. The heat exchanger 14 preheats the air entering the internal combustion decarbonization rotary kiln 13 to recover the heat in the system and save energy. When the temperature in the internal combustion decarbonization rotary kiln 13 is low, the hot air burner 15 is heated to The internal combustion decarbonization rotary kiln 13 supplies hot air so that the temperature inside the internal combustion decarbonization rotary kiln 13 meets the decarbonization requirements; the smoke outlet of the internal combustion decarbonization rotary kiln 13 is connected to the dryer 10 through a hot air pipeline, and the hot air pipeline section between the internal combustion decarbonization rotary kiln 13 and the dryer 10 is provided with a dryer air inlet 101 arranged close to the dryer 10. The dryer air inlet 101 adopts a variable frequency fan, which can adjust the air intake of the dryer 10. The hot air pipeline section between the internal combustion decarbonization rotary kiln 13 and the dryer 10 is also connected to the variable frequency fan. The exhaust gas outlet of the dryer 10 is connected to the dust collector 11 through the exhaust gas pipeline, and the dust collector 11 is connected to the main induced draft fan 12. The main induced draft fan 12 extracts the exhaust gas generated by the dryer 10, the gangue powder silo scale 3, and the additive powder silo scale 4. The main induced draft fan 12 is a variable frequency fan. The exhaust gas is discharged after dust removal by the dust collector 11. The dust collector 11 can use bag dust removal. A dust collection and discharge device is provided at the bottom of the dust collector 11.

[0025] Reference Figure 1-2The control system adopts a DCS centralized control system 100. The gangue powder bin 5, the additive powder bin 6, the water metering pump 92, and the dryer 10 are all connected to the DCS centralized control system 100. The first flow meter 95 is connected to the DCS centralized control system 100 by signal. The DCS centralized control system 100 controls the motor speed of the dryer 10, and then controls the forward speed of the gangue particles in the dryer 10 and the processing capacity of the dryer 10, so that the moisture content of the particles after drying meets the requirements, and correspondingly controls the feeding amount of the gangue powder bin 5, the additive powder bin 6, and the water metering pump 92 to the pre-nucleating machine 7. The first flow meter 95 is used to detect the flow of the water inlet pipeline. The dryer 10 is provided with a first temperature transmitter 102 for monitoring the internal temperature, the exhaust pipe between the exhaust outlet of the dryer 10 and the dust collector 11 is provided with a second temperature transmitter 111 for detecting the temperature of the flue gas in the pipe, and the hot air pipeline section between the internal combustion decarbonization rotary kiln 13 and the dryer 10 is provided with a dryer air inlet fan 101 for sending hot air into the dryer 10, a third temperature transmitter 142 for detecting the temperature of the hot air in the pipe and a second flow meter 143 for detecting the flow rate of the hot air in the pipe, as shown in FIG. Figure 1 As shown, the dryer air inlet fan 101, the third temperature transmitter 142, and the second flow meter 143 are arranged in the hot air pipeline section between the hot air outlet of the heat exchanger 14 and the dryer 10. The dryer air inlet fan 101 and the main exhaust fan 12 are all connected to the DCS centralized control system 100 for control. The first temperature transmitter 102, the second temperature transmitter 111, the third temperature transmitter 142, and the second flow meter 143 are all connected to the DCS centralized control system 100 for signal. The air volume entering the dryer 10 is adjusted by adjusting the frequency of the dryer air inlet fan 101, so that the temperature entering and leaving the dryer 10 is maintained at a suitable temperature and flow rate to ensure the drying effect. The internal combustion decarbonization rotary kiln 13 is provided with a first kiln temperature wireless detection system 133, and the pipeline between the decarbonization kiln air inlet fan 141 and the internal combustion decarbonization rotary kiln 13 is provided with a fourth temperature transmitter 145 for detecting the air temperature in the pipeline and a third flow meter 144 for monitoring the air flow in the pipeline, as shown in FIG. Figure 1As shown, the fourth temperature transmitter 145 and the third flow meter 144 are arranged in the section between the air outlet of the heat exchanger 14 and the mixer 136, the hot air pipeline section between the smoke outlet of the internal combustion decarbonization rotary kiln 13 and the heat exchanger 14 is provided with a fifth temperature transmitter 146 for detecting the smoke outlet temperature of the internal combustion decarbonization rotary kiln 13, the first kiln temperature wireless detection system 133, the third flow meter 144, the fourth temperature transmitter 145, and the fifth temperature transmitter 146 are all connected with the DCS centralized control system 100 by signal, the decarbonization kiln air inlet fan 141 and the hot air burner 15 are connected with the DCS centralized control system 100 by control, the air volume is adjusted by adjusting the frequency of the decarbonization kiln air inlet fan 141, so that the air heated by the heat exchanger 14 is kept at a certain temperature, and when the temperature in the internal combustion decarbonization rotary kiln 13 is lower than a certain temperature, the hot air burner 15 is used to supplement the internal combustion decarbonization rotary kiln 13 with hot air to meet the decarbonization requirements. The sintering kiln 17 is provided with a second kiln temperature wireless detection system 171, and the hot air pipeline section between the sintering kiln 17 and the internal combustion decarbonization rotary kiln 13 is provided with a sixth temperature transmitter 172 for detecting the hot air temperature and a fourth flow meter 173 for detecting the hot air flow rate. Figure 1 As shown, the sixth temperature transmitter 172 and the fourth flow meter 173 are arranged in the hot air pipeline section between the smoke outlet of the sintering kiln 17 and the mixer 136 to detect the temperature and flow of the hot air discharged from the sintering kiln 17. The second kiln temperature wireless detection system 171, the sixth temperature transmitter 172, and the fourth flow meter 173 are all connected to the DCS centralized control system 100 by signal. The burner 16, the air supply fan 163, and the sintering kiln 17 are control-connected to the DCS centralized control system 100. The speed of the sintering kiln 17 is adjustable. The flame size is controlled by adjusting the regulating valve of the burner 16 to make the kiln temperature meet the sintering requirements and make the hot air discharged from the sintering kiln 17 within a certain temperature range. When the combustion air is insufficient, the combustion air is supplemented to the burner 16 through the air supply fan 163. A combustible gas detector 170 is provided on site. When it is detected that the combustible gas on site reaches a certain concentration, the control valve of the burner 16 is automatically cut off to stop the introduction of gas.

[0026] Reference Figure 1 , 3 -4, the internal combustion decarbonization rotary kiln 13 includes a decarbonization kiln outer wall 134 and a decarbonization kiln inner wall 135. An insulation layer (not shown in the figure) is arranged between the decarbonization kiln outer wall 134 and the decarbonization kiln inner wall 135. An oxygen-enriching fan 22 is arranged outside the internal combustion decarbonization rotary kiln 13 to send air into the kiln to supplement the oxygen content in the kiln. The oxygen-enriching fan 22 is a variable frequency fan, which provides sufficient oxygen for the combustion of coal gangue particles and improves the decarbonization effect. The oxygen-enriching fan 22 is connected to the decarbonization kiln inner wall 135 through a pipeline. The oxygen-enriching fan 22 is connected to the decarbonization kiln inner wall 135 at multiple points through multiple pipelines, such as Figure 1 , 3As shown, the oxygen-enriching fan 22 is connected to the inner wall 135 of the decarbonization kiln at three points, that is, three air outlets are provided on the inner wall 135 of the decarbonization kiln to replenish air to the internal combustion decarbonization rotary kiln 13. The three air outlets are evenly distributed along the cross section of the inner wall 135 of the decarbonization kiln. The cross section of the inner wall 135 of the decarbonization kiln refers to the cross section perpendicular to the central axis of the internal combustion decarbonization rotary kiln 13. Of course, four, five or other number of air replenishment points can also be designed. Figure 3 As shown, the oxygen-enriching fan 22 is installed on the outer wall 134 of the decarbonization kiln through a bracket, and the air outlet of the oxygen-enriching fan 22 is connected to the air main pipe 23. The air main pipe 23 is annular and surrounds the outer circumference of the internal combustion decarbonization rotary kiln 13. The air main pipe 23 is connected to the inner wall 135 of the decarbonization kiln through three air branches. Specifically, each air branch is formed by connecting an external air pipe 25 and an internal air pipe 26, as shown in FIG. Figure 3 As shown, an external air pipe 25 is arranged outside the internal combustion decarbonization rotary kiln 13, one end of the external air pipe 25 is connected to the air main pipe 23, and the other end of the external air pipe 25 is connected to the outer wall 134 of the decarbonization kiln. An internal air pipe 26 is arranged in a space between the outer wall 134 of the decarbonization kiln and the inner wall 135 of the decarbonization kiln, one end of the internal air pipe 26 is connected to the outer wall 134 of the decarbonization kiln and communicates with the external air pipe 25, and the other end of the internal air pipe 26 is connected to the inner wall 135 of the decarbonization kiln. The internal air pipe 26 is connected in a detachable manner, such as a short pipe is provided on the outer wall 134 of the decarburization kiln, one end of the short pipe located inside the outer wall 134 of the decarburization kiln is fixedly connected to the internal air pipe 26, and one end of the short pipe located outside the outer wall 134 of the decarburization kiln is provided with a flange, and the end of the external air pipe 25 connected to the outer wall 134 of the decarburization kiln is also fixedly connected to a section of a short pipe, and the short pipe connected to the external air pipe 25 is also provided with a flange, and the external air pipe 25 and the internal air pipe 26 are connected by two flanges. The external air pipe 25 is provided with an electric switch valve. Specifically, the three external air pipes 25 are respectively provided with a first electric switch valve 23a, a second electric switch valve 23b, and a third electric switch valve 23c. The electric switch valve can be an electric valve such as an electric ball valve. Figure 3 As shown, the air main pipe 23 is provided with a first photoelectric switch 24a, a second photoelectric switch 24b, and a third photoelectric switch 24c corresponding to the three electric switch valves one by one. The photoelectric switch mentioned here refers to an element that emits a light signal. The first photoelectric switch 24a, the second photoelectric switch 24b, and the third photoelectric switch 24c are evenly distributed along the air main pipe 23. When the internal combustion decarbonization rotary kiln 13 rotates, the oxygen enrichment fan 22, the air main pipe 23, the three air branches, and the photoelectric switches rotate accordingly. The outside of the internal combustion decarbonization rotary kiln 13 is provided with a fixed receiver 27 for receiving signals from the first photoelectric switch 24a, the second photoelectric switch 24b, and the third photoelectric switch 24c.

[0027] Reference Figure 3-4The first photoelectric switch 24a, the second photoelectric switch 24b, the third photoelectric switch 24c, and the receiver 27 are connected to the PLC control module 200 by signal. The first electric switch valve 23a, the second electric switch valve 23b, and the third electric switch valve 23c are connected to the PLC control module 200 by control. When the receiver 27 receives different photoelectric switch signals, it controls different electric switch valves to open or close. Specifically, when the receiver 27 receives the light signal of one of the photoelectric switches, the PLC control module 200 controls the electric switch valve on the air branch pipe connected to the air outlet that is about to rotate to the lowest point of the circumference of the inner wall 135 of the decarbonization kiln to open, and the other switch valves are closed, so that air enters from where the material exists, such as Figure 3 As shown, the inner wall 135 of the decarbonization kiln is an irregular shape including multiple protrusions and depressions, and reference can be made to the rotary kiln of CN215983888U; the PLC control module 200 is connected to the control of the oxygen-enriching fan 22, and the PLC control module 200 is also connected to the industrial wireless remote controller 28 (i.e., transmitter) signal that controls the frequency of the oxygen-enriching fan 22, and adjusts the frequency and air volume of the oxygen-enriching fan 22 according to the amount of particles processed by the internal combustion decarbonization rotary kiln 13. The PLC control module 200 can be regarded as a part of the DCS centralized control system 100, and the DCS centralized control system 100 can also be regarded as a system composed of a PLC and a host computer.

[0028] It should be noted that the actual equipment and pipelines also include other valves, instruments, pumps and other accessories. For example, the internal combustion decarbonization rotary kiln 13 and the sintering kiln 17 are provided with a pressure transmitter for detecting the internal pressure, and the hot air pipeline is provided with a flue gas automatic monitoring system. These detection devices are also electrically connected to the DCS centralized control system 100, which is a conventional setting in the field and is not shown in the text or drawings. Figure 2 The figure shows the control schematic diagram of some equipment, instruments and control systems. The actual electrical equipment and detection instruments can be connected to the control system.

[0029] Working process: First, start the main induced draft fan 12 and the dust collector 11. The main induced draft fan 12 sets the frequency through the DCS centralized control system 100 host computer according to the early and late feeding conditions. Start the motor of the sintering kiln 17. The starting frequency is set from the host computer at 2r / min. Turn on the burner 16, and nitrogen is purged before ignition to meet the ignition requirements. The igniter and control valve are automatically turned on, and a small fire is ignited. The flame condition is detected according to the flame detection signal. When the time is reached, the high fire is automatically turned on. The gas regulating valve is automatically adjusted according to the set temperature. The gas and air ratio is properly adjusted to ensure sufficient combustion. The flame length is adjusted according to the use characteristics of the sintering kiln 17. When the temperature reaches the appropriate temperature, the material is put into production. When the combustible gas detector 170 detects that the on-site combustible gas concentration reaches the set value, it automatically alarms, automatically cuts off the gas control valve, switches to the purge process, and stops after five minutes of purge. During the temperature increase of the sintering kiln 17, the gangue powder silo pump 1 and the additive powder silo pump 2 are turned on for feeding, the blowing aid is turned on, the feed valve and the exhaust valve are opened, and the discharge valve and the air inlet valve are closed. When the material contacts the level meter, the level meter sends a full material signal, the feed valve and the exhaust valve are automatically closed, and the feeding process is completed. The feeding process of the silo pump is a conventional operation for powder feeding; when the pressure value of the gangue powder silo pump 1 reaches the set value, the discharge valve is automatically opened, the fluidization of the material is enhanced, and it begins to be transported to the gangue powder silo scale 3, and the pressure value gradually drops from high to low. During this process, the material in the gangue powder silo pump 1 is always in a side fluidization state; when the pressure drops to the pipeline resistance, the air inlet valve is closed, and the discharge valve is closed at a certain interval. The pressurization continues for 3-5 seconds, the pipeline is cleaned, and the feed valve is opened to complete a feeding and discharging conveying cycle. The gangue powder silo scale 3 determines whether the gangue powder silo pump 1 is fed according to the set weight, and the feeding method of the additive powder silo scale 4 is the same as that of the gangue powder silo scale 3. The feeding ratio of the gangue powder silo 5, the additive powder silo 6, and the water metering pump 92 is automatically adjusted by weight according to the formula requirements. The water is stabilized by the pressure-stabilizing water tank 9, and is regulated and transported to the pre-nucleating machine 7 through the water metering pump 92 and the first flow meter 95, and the pre-nucleating machine 7 mixes the materials evenly.The material enters the granulator 8, and the corresponding rotation speed and water inlet conditions are adjusted according to the granulation particle size requirements. Qualified material balls enter the dryer 10, and the tail gas (i.e. hot air) of the internal combustion decarbonization rotary kiln 13 enters the heat exchanger 14. The decarbonization kiln air inlet fan 141 is turned on. The air condensation principle is used to feedback the temperature through the first temperature transmitter 102, monitor the drying temperature in the dryer 10, adjust the frequency and air volume of the decarbonization kiln air inlet fan 141, and then adjust the air inlet temperature of the dryer 10. The speed of the dryer 10 is adjusted so that the material balls run evenly and slowly with the internal mesh belt, and the generated tail gas is sent to the dust collector 11 through the tail gas pipeline connected to the dryer 10. The exhaust gas outlet temperature of the dryer 10 is fed back to the DCS centralized control system 100 host computer through the second temperature transmitter 111. The inlet temperature of the dryer 10 is controlled at 300-350°C. The frequency and air volume of the dryer inlet fan 101 are adjusted, and the outlet temperature is controlled at 105±10°C. When the moisture content of the ball drying is controlled within 5%, the feed amount is adjusted to ensure product drying and prevent condensed water from mixing with dust in the exhaust pipe, which sticks to the pipe wall and the bag of the dust collector 11 and affects the service life of the equipment. The feed amount is adjusted through the coal gangue powder silo 5, the additive powder silo 6, and the water metering pump 92. The dried material balls enter the internal combustion decarbonization rotary kiln 13, and run at a speed of 1.5r / min to detect the pressure signal and temperature signal in the internal combustion decarbonization rotary kiln 13 in real time; the tail gas (i.e. hot air) generated by the sintering kiln 17 is fully mixed with the hot air from the decarbonization kiln air inlet fan 141 and then sent to the internal combustion decarbonization rotary kiln 13. When the set temperature value in the internal combustion decarbonization rotary kiln 13 cannot meet the temperature used by the internal combustion decarbonization rotary kiln 13, the hot air burner 15 is turned on to supplement the calorific value of the internal combustion decarbonization rotary kiln 13, and the temperature is controlled within 850±20℃, so that the coal gangue particles in the internal combustion decarbonization rotary kiln 13 are fully decarbonized at high temperature. In order to achieve the goal of reducing the carbon content to 0, it is necessary to turn on the oxygen enrichment fan 22 to Air is supplemented in the internal combustion decarbonization rotary kiln 13 to increase the oxygen content. The frequency and air volume of the oxygen-enriching fan 22 are adjusted according to the processing volume. The photoelectric switch, the oxygen-enriching fan 22 and the air pipeline rotate with the internal combustion decarbonization rotary kiln 13. When the receiver 27 receives the position signal of the first photoelectric switch 24a, the first electric switch valve 23a is opened, and the other electric switch valves are closed; when the position signal of the second photoelectric switch 24b is received, the second electric switch valve 23b is opened, and the other electric switch valves are closed; when the position signal of the third photoelectric switch 24c is received, the third electric switch valve 23c is opened, and the other electric switch valves are closed. The control is cyclically controlled to ensure that the gangue particles are fully burned and decarbonized in the internal combustion decarbonization rotary kiln 13.The decarbonized coal gangue pellets flow down into the sintering kiln 17, and the temperature in the kiln is monitored by the second kiln temperature wireless detection system 171. The temperature signal is transmitted to the DCS centralized control system 100 host computer, and the combustion temperature is controlled between 1200±20°C. The combustion temperature is automatically adjusted by controlling the burner 16. Because the coal gangue particles have already formed a combustion state in the internal combustion decarbonization rotary kiln 13, after entering the sintering kiln 17, the gas volume of the burner 16 is saved, the sintering time is shortened, and the cost is saved; the heat energy of the dryer 10 and the internal combustion decarbonization rotary kiln 13 mainly comes from the sintering kiln 17, which saves energy consumption. The finished gangue particles fired by the sintering kiln 17 enter the next level equipment cooler 18. The cooler 18 cools down through the main equipment and cools down by supplying cold air to the air inlet of the cooler 18. The cooled products are sent to the screening machine 20 by the conveyor belt 19. The screening machine 20 is classified and transported to the finished product ton bag system 21 according to the different particle size holes. The ton bag system 21 manually clicks the bag hanging button to hang the ton bag on the equipment hook, clicks the bag clamping button, and after completing the bag clamping and hanging process, the operation mode is switched to the automatic mode, and the target amount is set in advance. The equipment opens the feed valve 1 (large flow) and the feed valve 2 (small flow) according to the weighing and metering method. When the weight reaches close to the target amount, the feed valve 1 is closed, and the feed valve 2 continues to feed at a small flow rate. When the target amount is reached, the feeding is stopped. At this time, the cylinder automatically unhooks the ton bag and starts the belt conveyor. The belt conveyor stops when it receives the arrival signal. At this time, the equipment control executes a cycle.

[0030] The utility model discloses a coal gangue particle production system comprising a dryer, an internal combustion decarbonization rotary kiln and a sintering kiln. After the raw materials are granulated, they are processed by the dryer, the internal combustion decarbonization rotary kiln and the sintering kiln and then cooled to obtain products. The coal gangue particles are burned in the internal combustion decarbonization rotary kiln to remove carbon. During the decarbonization process, air is introduced to supplement the oxygen content, so that the carbon can be completely removed, thereby improving the quality and stability of the product. The heat used by the dryer and the internal combustion decarbonization rotary kiln mainly comes from the sintering kiln. When the coal gangue particles enter the sintering kiln, they are in a burning state, thereby saving energy consumption and cost. The control system controls multiple parameters and equipment in the production process, thereby improving the degree of automation and making the control more precise.

Claims

1. A coal gangue particle production system, comprising a coal gangue powder bin (5) for feeding coal gangue powder and an additive powder bin (6) for feeding additive powder, wherein the discharge ports of the coal gangue powder bin (5) and the additive powder bin (6) are both connected to the feed port of a pre-nucleating machine (7), the pre-nucleating machine (7) is also connected to a water inlet pipeline, the pre-nucleating machine (7) is sequentially connected to a granulator (8), a dryer (10), a sintering kiln (17), and a cooler (18) through a material conveying line, the sintering kiln (17) is connected to a burner (16), and the burner (16) is connected to a gas supply pipe (161) and an air supply pipe (162), wherein: An internal combustion decarbonization rotary kiln (13) is provided in the material conveying line section between the dryer (10) and the sintering kiln (17); a hot air outlet of the sintering kiln (17) is connected to the internal combustion decarbonization rotary kiln (13) and the dryer (10) in sequence through a hot air pipeline; and the gangue powder bin (5), the additive powder bin (6), the dryer (10), the burner (16), and the sintering kiln (17) are all connected to a control system.

2. The coal gangue particle production system according to claim 1, characterized in that: The control system is a DCS centralized control system (100).

3. The coal gangue particle production system according to claim 2, characterized in that: The feed port of the gangue powder silo (5) is connected to the discharge port of the gangue powder silo scale (3), the gangue powder silo scale (3) is connected to the gangue powder silo pump (1) via a powder delivery pipeline, the feed port of the additive powder silo (6) is connected to the discharge port of the additive powder silo scale (4), and the additive powder silo scale (4) is connected to the additive powder silo pump (2) via a powder delivery pipeline.

4. The coal gangue particle production system according to claim 3, characterized in that: A water inlet pipeline connected to the pre-nucleating machine (7) is provided with a pressure-stabilizing water tank (9), a water metering pump (92), and a first flow meter (95) arranged in sequence along the water flow direction; the water metering pump (92) is control-connected to a DCS centralized control system (100); and the first flow meter (95) is signal-connected to the DCS centralized control system (100).

5. The coal gangue particle production system according to claim 4, characterized in that: The exhaust gas outlet of the dryer (10) is connected to the dust collector (11) through an exhaust gas pipeline, and the dust collector (11) is also connected to a main induced draft fan (12). The dryer (10) is provided with a first temperature transmitter (102) for detecting the internal temperature, and the exhaust gas pipeline is provided with a second temperature transmitter (111) for measuring the temperature of the flue gas in the pipeline. The first temperature transmitter (102) and the second temperature transmitter (111) are both connected to the DCS centralized control system (100) by signal. The internal combustion decarbonization rotary kiln (13) and the dryer (10) are connected to the internal combustion decarbonization rotary kiln (13). The hot air pipeline section is provided with a dryer air inlet fan (101) for delivering hot air into the dryer (10), a third temperature transmitter (142) for detecting the temperature of the hot air delivered into the dryer (10), and a second flow meter (143) for detecting the flow rate of the hot air delivered into the dryer (10). The dryer air inlet fan (101) is a variable frequency fan. The dryer air inlet fan (101) is control-connected to a DCS centralized control system (100). The third temperature transmitter (142) and the second flow meter (143) are both signal-connected to the DCS centralized control system (100).

6. The coal gangue particle production system according to claim 5, characterized in that: The internal combustion decarbonization rotary kiln (13) is provided with a first kiln temperature wireless detection system (133); the hot air pipeline section between the internal combustion decarbonization rotary kiln (13) and the sintering kiln (17) is connected to the decarbonization kiln air inlet fan (141) and the hot air burner (15) through a gas pipeline, respectively; the gas pipeline connected to the air outlet of the decarbonization kiln air inlet fan (141) is provided with a heat exchanger (14), a third flow meter (144) for detecting the pipeline gas flow rate, and a fourth temperature transmitter (145) for detecting the pipeline gas temperature; the heat exchanger (14) is also connected to the internal combustion decarbonization rotary kiln (13) and the drying machine. The hot air pipeline between the internal combustion decarbonization rotary kiln (13) and the drying machine (10) is connected, and a fifth temperature transmitter (146) for detecting the flue gas outlet temperature of the internal combustion decarbonization rotary kiln (13) is also provided on the hot air pipeline section between the internal combustion decarbonization rotary kiln (13) and the drying machine (10). The first kiln temperature wireless detection system (133), the third flow meter (144), the fourth temperature transmitter (145), and the fifth temperature transmitter (146) are all connected to the DCS centralized control system (100) by signal, and the decarbonization kiln air inlet fan (141) and the hot air burner (15) are all connected to the DCS centralized control system (100) for control.

7. The coal gangue particle production system according to claim 6, characterized in that: The internal combustion decarbonization rotary kiln (13) is connected to an oxygen-enriching fan (22) for replenishing oxygen content in the kiln through a pipeline; the oxygen-enriching fan (22) is a variable frequency fan; the oxygen-enriching fan (22) is control-connected to a PLC control module (200); and the PLC control module (200) is signal-connected to an industrial wireless remote controller (28) for controlling the frequency of the oxygen-enriching fan (22).

8. The coal gangue particle production system according to claim 7, characterized in that: The oxygen-enriching fan (22) is connected to the inner wall (135) of the decarbonization kiln (13) of the internal combustion decarbonization rotary kiln (13) at multiple points through multiple pipes. The pipe air outlets on the inner wall (135) of the decarbonization kiln are evenly distributed along the cross-section of the inner wall (135) of the decarbonization kiln. An electric switch valve is provided on each pipe connecting the oxygen-enriching fan (22) to the inner wall (135) of the decarbonization kiln. The electric switch valve is control-connected to a PLC control module (200). The PLC control module (200) is connected to a photoelectric switch signal for controlling the switch of the electric switch valve. The photoelectric switch and the electric switch valve are arranged in a one-to-one correspondence. The PLC control module (200) is also connected to a receiver (27) for receiving the photoelectric switch signal.

9. The coal gangue particle production system according to claim 8, characterized in that: The sintering kiln (17) is provided with a second kiln temperature wireless detection system (171); a sixth temperature transmitter (172) for detecting the flue gas outlet temperature of the sintering kiln (17) and a fourth flow meter (173) for detecting the flue gas flow rate in the pipeline are provided on the hot air pipeline section between the sintering kiln (17) and the internal combustion decarbonization rotary kiln (13); the second kiln temperature wireless detection system (171), the sixth temperature transmitter (172) and the fourth flow meter (173) are all connected to the DCS centralized control system (100) by signal.

10. The coal gangue particle production system according to claim 9, characterized in that: The cooler (18) is connected to a cooler fan (181) via a pipeline, an air outlet of the cooler (18) is connected to an air supply pipe (162) via a pipeline, and a material outlet of the cooler (18) is sequentially connected to a conveyor belt (19), a screening machine (20), and a ton bag system (21) via a material conveying line.

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