Coal Slime Blending Combustion System for Circulating Fluidized Bed Boiler

Abstract

The present application provides a circulating fluidized bed boiler coal slime blending system, comprising: a coal slime bin, an elevator, a coal slime conveying unit, a coal slime regulating unit, a paste pump and a furnace, wherein the feed end of the coal slime conveying unit is located below the discharge end of the elevator hopper, the discharge end of the coal slime conveying unit is located above the feed port of the coal slime regulating unit, the discharge port of the coal slime regulating unit is connected to the furnace through a coal slime conveying pipe, and the paste pump is arranged on the coal slime conveying pipe. An iron remover is arranged above the coal slime conveying unit. The coal slime regulating unit comprises a first coal slime regulating tank, a water storage tank and a first agitator, the water storage tank is connected to the first coal slime regulating tank through a first water supply pipeline, and the discharge port of the first coal slime regulating tank is connected to the furnace through a coal slime conveying pipe. The present application realizes efficient transportation and blending of coal slime during the combustion process of a circulating fluidized bed boiler.

Description

Technical Field

[0001] The present application relates to the technical field of circulating fluidized bed boiler combustion, and in particular to a circulating fluidized bed boiler coal sludge blending combustion system. Background Art

[0002] Coal prices continue to rise, hitting new highs, and boiler combustion costs are constantly increasing. By mixing coal slime with boilers, production costs can be effectively reduced and economic benefits can be improved. Coal slime is a by-product of the coal washing process in coal mines and has a certain calorific value. Therefore, using coal slime as a cheap fuel for mixing with boilers can reduce fuel costs and reduce the impact of coal slime emissions on the environment. At the same time, it solves the problem of solid waste treatment of coal slime gas and realizes the recycling of solid waste resources.

[0003] However, because the coal slime contains some impurities and has high viscosity, the particle size is uneven during the coal slime transportation process. Some large particles of coal slime or impurities will cause wear of the paste pump and transportation equipment, which is not conducive to the stable operation of the coal slime blending system and increases the frequency of equipment maintenance. Utility Model Content

[0004] The present application provides a circulating fluidized bed boiler coal sludge blending combustion system to solve the above-mentioned problems mentioned in the background technology.

[0005] The present application provides a circulating fluidized bed boiler coal slime blending system, comprising: a coal slime bin, an elevator, a coal slime conveying unit, a coal slime regulating unit, a paste pump and a furnace, wherein one end of the elevator is arranged in the coal slime bin, the other end of the elevator is higher than the side wall of the coal slime bin, a hopper is arranged on the elevator, a feed end of the coal slime conveying unit is located below a discharge end of the elevator hopper, a discharge end of the coal slime conveying unit is located above a feed port of the coal slime regulating unit, a discharge port of the coal slime regulating unit is connected to the furnace through a coal slime conveying pipe, and a paste pump is arranged on the coal slime conveying pipe. The upper part of the furnace is connected to a main flue and a chimney in sequence.

[0006] An iron remover is arranged above the coal slime conveying unit.

[0007] The coal slime regulating unit includes a first coal slime regulating tank, a water storage tank and a first agitator. The outlet end of the coal slime conveying unit is located above the top feed port of the first coal slime regulating tank. The water storage tank is connected to the first coal slime regulating tank through a first water supply pipeline. A first water valve is provided on the first water supply pipeline. The discharge port of the first coal slime regulating tank is connected to the furnace through a coal slime conveying pipe. The discharge port of the first coal slime regulating tank is provided with a first coal slime valve. The first agitator is located in the first coal slime regulating tank.

[0008] Optionally, the coal slime conveying unit includes a first guide plate and a conveying belt, the first guide plate is inclined, and the higher end of the first guide plate is located below the discharge end of the elevator hopper, the lower end of the first guide plate is located above the feed end of the conveying belt, and the discharge end of the conveying belt is located above the first coal slime regulating tank.

[0009] Optionally, the coal slime blending system is also provided with a crushing unit, which includes a grate and a crusher. The grate is inclined at the upper part of the coal slime adjusting tank, and the lower end of the grate is connected to the feed port of the crusher through a second guide plate. The discharge port of the crusher is connected to the top feed port of the first coal slime adjusting tank.

[0010] Optionally, the coal sludge blending system is also provided with an antifreeze unit, which includes an antifreeze sleeve, a branch flue, a flue gas regulating valve and an air preheater.

[0011] The antifreeze sleeve is installed on the outer periphery of the coal slime conveying pipe, one end of the branch flue is connected with the main flue, and the other end of the branch flue is connected with the end of the main flue close to the chimney. The air preheater is arranged on the branch flue, one end of the air preheater is connected with the blower, and the other end of the air preheater is connected with the hot gas inlet of the antifreeze sleeve. A hot gas outlet is provided at the end of the antifreeze sleeve away from the hot gas inlet, and a flue gas regulating valve is arranged on the branch flue.

[0012] Optionally, the coal slime regulating unit also includes a second coal slime regulating tank, a second agitator, a second water pipeline, a coal slime conveying branch pipe and a rotary chute.

[0013] The second agitator is located inside the second coal slime regulating tank. The second coal slime regulating tank is connected to the water tank through a second water supply pipeline. A second water valve is provided on the second water supply pipeline. The discharge port of the second coal slime regulating tank is connected to the coal slime conveying pipe through a coal slime conveying branch pipe. A second coal slime valve is provided at the discharge port of the second coal slime regulating tank.

[0014] The rotary chute is obliquely arranged between the conveyor belt and the first coal slime regulating tank, the higher end of the rotary chute is located below the discharge end of the conveyor belt, and the lower end of the rotary chute is located above the first coal slime regulating tank.

[0015] Optionally, the rotary chute includes a rotary mechanism, a connecting rod, a support rod and a chute, the two ends of the connecting rod are respectively connected to the rotary mechanism and the chute, the two ends of the support rod are respectively connected to the connecting rod and the chute, and the connecting rod, the support rod and the chute are connected in a triangle.

[0016] Optionally, a first water content detector is provided in the first coal slime adjusting tank, and a second water content detector is provided in the second coal slime adjusting tank.

[0017] Optionally, a first material level meter is provided in the first coal slime adjusting tank, and a second material level meter is provided in the second coal slime adjusting tank.

[0018] The coal slime blending system for a circulating fluidized bed boiler provided in the present application realizes efficient blending of coal slime during the combustion process of a circulating fluidized bed boiler, and has the following beneficial effects compared to the prior art:

[0019] (1) By setting an iron remover above the coal slime conveying unit, during the transportation of the coal slime, the strong magnetic field attraction of the electromagnetic block in the iron remover absorbs the magnetic impurities (such as iron blocks, iron flakes, etc.) in the coal slime, thereby removing the magnetic impurities in the coal slime. This avoids the impact and wear of the paste pump and transportation equipment by the magnetic impurities in the coal slime, reduces the frequency of equipment maintenance and replacement, and helps the long-term and stable operation of the coal slime blending system, which is beneficial to ensuring the continuous and stable output of boiler heat energy. By setting up a coal slime regulating unit, adding water to the coal slime can maintain the good fluidity of the coal slime, avoid the clogging of the paste pump and pipeline due to the high viscosity of the coal slime, and at the same time adjust the water content in the coal slime. A small amount of water in the coal slime is cracked during the combustion of the coal slime, which plays a role in combustion and is beneficial to the thermal effect of the boiler.

[0020] (2) By setting up an antifreeze unit, an insulation layer is formed around the coal slime conveying pipe to prevent coal slime from agglomerating due to low temperature during transportation. By exchanging heat between the branch flue and the air in the air preheater and then transferring it back to the main flue, the flue gas is processed through the chimney, so that the waste heat of the flue gas can be utilized. And using air as the heat exchange medium is more environmentally friendly and energy-saving.

[0021] (3) The rotary chute is used to switch the outlet end of the rotary chute above the first coal slime regulating tank and the second coal slime regulating tank, so that the first coal slime regulating tank and the second coal slime regulating tank are used alternately, ensuring the uninterrupted and continuous operation of the coal slime blending system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a circulating fluidized bed boiler coal sludge blending system provided in one embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a crushing unit provided in one embodiment of the present application;

[0025] Figure 3 A schematic structural diagram of a coal sludge blending system for a circulating fluidized bed boiler provided in another embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a coal slime regulating unit provided in one embodiment of the present application;

[0027] Figure 5 A schematic diagram of the structure of a rotary chute provided in one embodiment of the present application;

[0028] Description of reference numerals:

[0029] 1: coal slime bin, 2: elevator, 5: paste pump, 6: furnace, 33: rotary chute, 210: iron remover, 310: first guide plate, 320: conveyor belt, 330: rotary mechanism, 340: connecting rod, 350: support rod, 360: chute, 410: first coal slime regulating tank, 420: water storage tank, 421: first water pipeline, 422: second water pipeline, 430: first agitator, 440: second coal slime regulating tank, 450: second agitator, 510: coal slime conveying pipe, 520: coal slime Conveying branch pipe, 610: main flue, 620: chimney, 710: grate, 720: crusher, 730: second material guide plate, 810: antifreeze sleeve, 820: branch flue, 830: flue gas regulating valve, 840: air preheater, 850: blower, 4101: first coal slime valve, 4102: first moisture content detector, 4103: first material level meter, 4211: first water valve, 4221: second water valve, 4401: second coal slime valve, 4402: second moisture content detector, 4403: second material level meter. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are 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 also fall within the scope of protection of the present application.

[0031] like Figure 1 As shown, the present application provides a circulating fluidized bed boiler coal slime blending system, including: a coal slime bin 1, an elevator 2, a coal slime conveying unit, a coal slime regulating unit, a paste pump 5 and a furnace 6, one end of the elevator 2 is arranged in the coal slime bin 1, the other end of the elevator 2 is higher than the side wall of the coal slime bin 1, a hopper is arranged on the elevator 2, the feed end of the coal slime conveying unit is located below the discharge end of the hopper of the elevator 2, the discharge end of the coal slime conveying unit is located above the feed port of the coal slime regulating unit, the discharge port of the coal slime regulating unit is connected to the furnace 6 through a coal slime conveying pipe 510, and the paste pump 5 is arranged on the coal slime conveying pipe 510. The upper part of the furnace 6 is connected with a main flue 610 and a chimney 620 in sequence.

[0032] An iron remover 210 is provided above the coal slime conveying unit.

[0033] The coal slime regulating unit includes a first coal slime regulating tank 410, a water storage tank 420 and a first agitator 430. The outlet end of the coal slime conveying unit is located above the top feed port of the first coal slime regulating tank 410. The water storage tank 420 is connected to the first coal slime regulating tank 410 through a first water supply pipeline 421. A first water valve 4211 is provided on the first water supply pipeline 421. The discharge port of the first coal slime regulating tank 410 is connected to the furnace 6 through a coal slime conveying pipe 510. The discharge port of the first coal slime regulating tank 410 is provided with a first coal slime valve 4101. The first agitator 430 is located in the first coal slime regulating tank 410.

[0034] Specifically, the coal slime bin 1 is used to store the coal slime from the coal washing process. The hoist 2 transfers the coal slime in the coal slime bin 1 to the coal slime conveying unit through the hopper, and then transfers the coal slime to the coal slime regulating unit through the coal slime conveying unit. The coal slime regulating unit makes the coal slime particles more uniform, which is convenient for the paste pump 5 to convey the coal slime, and avoids the uneven coal slime particles from causing wear to the paste pump 5 and the pipeline. At the same time, it helps the coal slime to have a good molding effect when entering the furnace 6, which is conducive to the full combustion of the coal slime in the furnace 6 and the boiler has a good thermal effect. A gas burner is set in the middle of the furnace 6 to burn the coal gas and the coal slime from the top of the furnace at the same time. By mixing the coal slime, the amount of coal gas is saved, and the price of coal slime is low, which reduces the production cost of the enterprise. At the same time, the treatment of coal slime solid waste is solved to achieve the purpose of waste utilization. The flue gas generated after the combustion of the furnace 6 is transported to the chimney 620 through the main flue 610.

[0035] An iron remover 210 is arranged above the coal slime conveying unit. The coal slime on the coal slime conveying unit passes through the iron remover 210 during transportation. An electromagnetic block is arranged in the iron remover 210. The strong magnetic field attraction of the electromagnetic block adsorbs the magnetic impurities (such as iron blocks, iron sheets, etc.) in the coal slime onto the iron remover 210 to remove the magnetic impurities in the coal slime. In this way, during the subsequent transportation of the coal slime, the impact and wear of the paste pump 5 and the transportation equipment by the magnetic impurities in the coal slime is avoided, the frequency of equipment maintenance and replacement is reduced, and at the same time, it is conducive to the long-term and stable operation of the coal slime blending system, which is conducive to ensuring the continuous and stable output of boiler heat energy.

[0036] The coal slime regulating unit includes a first coal slime regulating tank 410, a water tank 420 and a first agitator 430. The water tank 420 adds water to the first coal slime regulating tank 410 through a first water delivery pipeline 421. The first agitator 430 is used to stir the coal slime and water. Adding water to the coal slime can keep the coal slime with good fluidity, avoid the coal slime from blocking the paste pump 5 and the pipeline due to its high viscosity, and at the same time adjust the water content in the coal slime. A small amount of water in the coal slime is cracked during the coal slime combustion process, which plays a role in combustion and is beneficial to the thermal effect of the boiler. The first agitator 430 can also break up the large particles in the coal slime during the stirring process, which is beneficial to the homogenization of the coal slime. Water is added to the first coal slime regulating tank 410 by adjusting the opening of the first water valve 4211. After the water is added, the first coal slime valve 4101 and the paste pump 5 are opened, and the regulated coal slime is transported to the furnace 6 through the coal slime delivery pipe 510, and falls from the top of the furnace 6 into the furnace 6 in a columnar shape for combustion. As the coal slime falls in the furnace 6, the surface moisture evaporates rapidly under the high temperature in the furnace (and a small part of it is cracked into hydrogen and oxygen), forming a hard shell on the surface of the coal slime column, which prevents the internal steam from escaping. When the internal pressure reaches a certain value, the columnar coal slime explodes, causing the coal slime to break and burn rapidly.

[0037] The present application realizes the efficient transportation and blending of coal slime during the combustion process of the circulating fluidized bed boiler through the above scheme. By setting an iron remover above the coal slime conveying unit, the strong magnetic field attraction of the electromagnetic block in the iron remover adsorbs the magnetic impurities (such as iron blocks, iron sheets, etc.) in the coal slime during transportation of the coal slime, thereby removing the magnetic impurities in the coal slime. The impact and wear of the paste pump and transportation equipment by the magnetic impurities in the coal slime are avoided, the frequency of equipment maintenance and replacement is reduced, and at the same time, it is conducive to the long-term and stable operation of the coal slime blending system, which is conducive to ensuring the continuous and stable output of boiler heat energy. By setting a coal slime regulating unit, adding water to the coal slime can keep the coal slime with good fluidity, avoid the coal slime from clogging the paste pump and pipeline due to its high viscosity, and at the same time adjust the water content in the coal slime. A small amount of water in the coal slime is cracked during the combustion of the coal slime, which plays a role in combustion and is beneficial to the thermal effect of the boiler.

[0038] like Figure 1 and Figure 2 As shown, optionally, the coal slime conveying unit includes a first guide plate 310 and a conveying belt 320, the first guide plate 310 is inclined, and the higher end of the first guide plate 310 is located below the discharge end of the hopper of the elevator 2, and the lower end of the first guide plate 310 is located above the feed end of the conveying belt 320, and the discharge end of the conveying belt 320 is located above the first coal slime regulating tank 410.

[0039] Specifically, the first guide plate 310 is used to receive the coal slime at the discharge end of the hopper of the elevator 2, and transport the coal slime to the conveyor belt 320 under the action of inclination, and then the conveyor belt 320 transports the coal slime to the first coal slime regulating tank 410 for water addition and regulation. This arrangement is simple in structure and easy to operate.

[0040] The iron remover 210 is disposed above the conveyor belt 320 .

[0041] like Figure 2 As shown, optionally, the coal slime blending system is further provided with a crushing unit, which includes a grate 710 and a crusher 720. The grate 710 is obliquely arranged at the upper part of the first coal slime regulating tank 410, and the lower end of the grate 710 is connected to the feed port of the crusher 720 through the second guide plate 730. The discharge port of the crusher 720 is connected to the top feed port of the first coal slime regulating tank 410.

[0042] Specifically, the grate 710 is tiltedly arranged at the upper part of the first coal slime regulating tank 410 to filter the coal slime from the conveyor belt 320 and block the large particles of coal slime at the upper part of the grate 710. As the coal slime is continuously conveyed and the grate 710 is tiltedly arranged, the large particles of coal slime at the upper part of the grate 710 move to the lower end of the grate 710 under gravity and enter the crusher 720 through the second guide plate 730 for crushing. The small particles of coal slime obtained at the discharge port of the crusher 720 are then transported back to the first coal slime regulating tank 410, so that the coal slime is further homogenized, which helps the coal slime to smoothly enter the furnace for continued combustion and avoids the wear of the paste pump 5 and the pipeline by the coal slime.

[0043] At the same time, the slurry is filtered and crushed at the same time, which improves the effective utilization rate of the crusher 720 and improves the working efficiency. In addition, the iron remover 210 is used to remove iron first, which avoids the damage of the crusher blade by the iron blocks in the coal slime.

[0044] like Figure 3 As shown, optionally, the coal sludge blending system is further provided with an antifreeze unit, which includes an antifreeze sleeve 810, a branch flue 820, a flue gas regulating valve 830 and an air preheater 840.

[0045] The antifreeze sleeve 810 is sleeved on the outer periphery of the coal slime conveying pipe 510, one end of the branch flue 820 is connected to the main flue 610, and the other end of the branch flue 820 is connected to an end of the main flue 610 close to the chimney 620, an air preheater 840 is arranged on the branch flue 820, one end of the air preheater 840 is connected to the blower 850, and the other end of the air preheater 840 is connected to the hot gas inlet of the antifreeze sleeve 810, a hot gas outlet is provided at the end of the antifreeze sleeve 810 away from the hot gas inlet, and a flue gas regulating valve 830 is arranged on the branch flue 820.

[0046] Specifically, since the coal slime contains water, it is easy to freeze into blocks during transportation in winter when the temperature is low, causing the pump body and pipeline to be blocked, making it difficult for the coal slime to reach the furnace 6 for mixed combustion. The coal slime antifreeze unit can keep the coal slime warm during transportation to prevent the water in the coal slime from freezing and causing the coal slime to agglomerate.

[0047] The antifreeze sleeve 810 is sleeved on the outer periphery of the coal slime conveying pipe 510, and part of the flue gas in the main flue 610 is led to the branch flue 820. The air preheater 840 is arranged on the branch flue 820, and air is blown into the air preheater 840 by the blower 850. When the flue gas with heat in the branch flue 820 flows through the air preheater 840, it indirectly exchanges heat with the air in the air preheater 840, so that the air temperature is increased to obtain hot air. The hot air enters the antifreeze sleeve 810 through the hot air inlet of the antifreeze sleeve 810 through the pipeline, and forms a heat preservation layer around the coal slime conveying pipe 510, thereby preventing the coal slime from agglomerating due to the low temperature during transportation. The hot air in the antifreeze sleeve 810 moves to the hot air outlet for output and is discharged into the atmosphere. The flue gas regulating valve 830 is used to adjust the amount of flue gas entering the branch flue 820, and further adjust the temperature of the hot air obtained in the air preheater 840 to ensure that the coal slime in the coal slime conveying pipe 510 does not agglomerate.

[0048] After the branch flue 820 exchanges heat with the air in the air preheater 840, the air is fed back to the main flue 610, and the flue gas is processed through the chimney 620 so that the waste heat of the flue gas can be utilized. And using air as the heat exchange medium is more environmentally friendly and energy-saving.

[0049] like Figure 4 As shown, optionally, the coal slime regulating unit further includes a second coal slime regulating tank 440 , a second agitator 450 , a second water pipeline 422 , a coal slime conveying branch pipe 520 and a rotary chute 33 .

[0050] The second agitator 450 is located inside the second coal slime regulating tank 440. The second coal slime regulating tank 440 is connected to the water storage tank 420 through a second water pipeline 422. A second water valve 4221 is provided on the second water pipeline 422. The discharge port of the second coal slime regulating tank 440 is connected to the coal slime conveying pipe 510 through a coal slime conveying branch pipe 520. A second coal slime valve 4401 is provided at the discharge port of the second coal slime regulating tank 440.

[0051] The rotary chute 33 is obliquely arranged between the conveyor belt 320 and the first coal slime regulating tank 410 , with the higher end of the rotary chute 33 located below the discharge end of the conveyor belt 320 , and the lower end of the rotary chute 33 located above the first coal slime regulating tank 410 .

[0052] Specifically, the coal slime regulating unit is further provided with a second coal slime regulating tank 440, which can be used as a backup with the first coal slime regulating tank 410, and continuously provide coal slime to the furnace 6 for blending and burning, thereby ensuring the uninterrupted and continuous operation of the coal slime blending and burning system. The rotary chute 33 is used as a transfer chute to transport the coal slime on the conveyor belt 320 to the first coal slime regulating tank 410 and the second coal slime regulating tank 440, respectively, and the rotary chute 33 can rotate, so that the outlet end of the rotary chute 33 is switched above the first coal slime regulating tank 410 and the second coal slime regulating tank 440 by rotation.

[0053] After the coal slime in the first coal slime regulating tank 410 is stirred, the coal slime on the conveying belt 320 is transported to the second coal slime regulating tank 440 by rotating the rotary chute 33, and the second agitator 450 and the second water pipeline 422 are opened to regulate the coal slime in the second coal slime regulating tank 440. After the coal slime in the first coal slime regulating tank 410 is transported, the first coal slime valve 4101 is closed, and the second coal slime valve 4401 is opened to transport the coal slime in the second coal slime regulating tank 440 to the furnace 6 for blending. This cycle is repeated to ensure the continuity of coal slime blending.

[0054] A grate is provided above the second coal slime regulating tank 440 and is connected to the crusher 720 .

[0055] like Figure 5 As shown, optionally, the rotary chute 33 includes a rotary mechanism 330, a connecting rod 340, a support rod 350 and a chute 360, the two ends of the connecting rod 340 are respectively connected to the rotary mechanism 330 and the chute 360, the two ends of the support rod 350 are respectively connected to the connecting rod 340 and the chute 360, and the connecting rod 340, the support rod 350 and the chute 360 ​​are connected in a triangle.

[0056] Specifically, the rotary mechanism 330 can rotate and drive the connecting rod 340 to rotate at the same time, and the connecting rod 340 drives the support rod 350 and the chute 360 ​​to rotate, so that the outlet end of the rotary chute 33 is switched above the first coal slime regulating tank 410 and the second coal slime regulating tank 440, so as to achieve the effect of alternate use of the first coal slime regulating tank 410 and the second coal slime regulating tank 440. The connecting rod 340 is used to reinforce the chute 360, and the connecting rod 340, the support rod 350 and the chute 360 ​​are connected in a triangle, so that the chute 360 ​​is more stable.

[0057] like Figure 4 As shown, optionally, a first water content detector 4102 is provided in the first coal slime adjusting tank 410 , and a second water content detector 4402 is provided in the second coal slime adjusting tank 440 .

[0058] Specifically, the first water content detector 4102 is used to detect the water content of the coal slime in the first coal slime regulating tank 410, and control the opening and closing and opening degree of the first water valve 4211. The second water content detector 4402 can detect the water content of the coal slime in the second coal slime regulating tank 440, and control the opening and closing and opening degree of the second water valve 4221. This facilitates the precise control of the water content of the coal slime, further improves the quality of the coal slime, and is conducive to the efficient operation of coal slime blending and combustion.

[0059] like Figure 4 As shown, optionally, a first material level meter 4103 is provided in the first coal slime adjusting tank 410 , and a second material level meter 4403 is provided in the second coal slime adjusting tank 440 .

[0060] Specifically, the first material level meter 4103 detects the material level in the first coal slime adjusting tank 410 in real time. When coal slime is input into the first coal slime adjusting tank 410, a first preset material level is set for the first material level meter 4103. When the material level detected by the first material level meter 4103 is equal to the first preset material level, the rotary mechanism 330 is rotated to open the first water valve 4211, and water is added to the first coal slime adjusting tank 410. When the water content detected by the first water content detector 4102 is equal to the preset water content, the first water valve 4211 is closed.

[0061] The second material level meter 4403 detects the material level in the second coal slime adjusting tank 440 in real time. When coal slime is input into the second coal slime adjusting tank 440, a second preset material level is set for the second material level meter 4403. When the material level detected by the second material level meter 4403 is equal to the second preset material level, the rotary mechanism 330 is rotated to open the second water valve 4221 to add water to the second coal slime adjusting tank 440. When the water content detected by the second water content detector 4402 is equal to the preset water content, the second water valve 4221 is closed.

[0062] The frequency of the paste pump 5 is controlled by the amount of coal slime blending required for combustion in the furnace, thereby controlling the conveying speed of the conveyor belt 320, the opening of the first water valve 4211, and the second water valve 4221, to ensure that when the coal slime in the first coal slime regulating tank 410 or the second coal slime regulating tank 440 is completely discharged, the coal slime in the second coal slime regulating tank 440 or the first coal slime regulating tank 410 has been completely stirred.

[0063] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0064] The operation process of the circulating fluidized bed boiler coal sludge blending system in this embodiment is as follows:

[0065] The elevator 2 transfers the coal slime in the coal slime bin 1 to the first guide plate 310 through the hopper. The first guide plate 310 transfers the coal slime to the conveyor belt 320 under the action of inclination. Then the conveyor belt 320 transfers the coal slime to the first coal slime regulating tank 410 for water addition and regulation. The coal slime on the conveyor belt 320 passes through the iron remover 210 during transportation. The strong magnetic field attraction of the electromagnetic block in the iron remover 210 adsorbs the magnetic impurities (such as iron blocks, iron sheets, etc.) in the coal slime on the iron remover 210, thereby removing the magnetic impurities in the coal slime.

[0066] The coal slime on the conveyor belt 320 is transported to the first coal slime regulating tank 410 through the rotary chute 33. By setting the first preset material level for the first material level meter 4103, as the conveyor belt 320 runs, when the material level detected by the first material level meter 4103 is equal to the first preset material level, the rotary mechanism 330 is rotated to the second coal slime regulating tank 440, and the first water valve 4211 and the first stirrer 430 are opened at the same time. Water is added to the first coal slime regulating tank 410 under stirring. When the water content detected by the first water content detector 4102 is equal to the preset water content, the first water valve 4211 is closed. The first coal slime valve 4101 and the paste pump 5 are opened, and the regulated coal slime is transported to the furnace 6 through the coal slime conveying pipe 510, and falls from the top of the furnace 6 into the furnace 6 in a columnar shape for combustion. As the coal slime falls in the furnace 6, the surface moisture evaporates rapidly under the high temperature in the furnace (and a small part of it is cracked into hydrogen and oxygen), forming a hard shell on the surface of the coal slime column, which prevents the internal steam from escaping. When the internal pressure reaches a certain value, the columnar coal slime explodes, causing the coal slime to break and burn rapidly.

[0067] The second material level meter 4403 detects the material level in the second coal slime regulating tank 440 in real time. When the coal slime in the first coal slime regulating tank 410 is transported to the furnace 6, when the coal slime is input into the second coal slime regulating tank 440, the second preset material level is set for the second material level meter 4403. When the material level detected by the second material level meter 4403 is equal to the second preset material level, the rotary mechanism 330 is rotated, the second water valve 4221 and the second agitator 450 are opened, and water is added to the second coal slime regulating tank 440. When the water content detected by the second water content detector 4402 is equal to the preset water content, the second water valve 4221 is closed. The first coal slime valve 4101 is closed, and the second coal slime valve 4401 is opened to transport the coal slime in the second coal slime regulating tank 440 to the furnace 6 for blending. This cycle is carried out to ensure the continuity of coal slime blending.

[0068] The grate 710 filters the coal slime entering the first coal slime regulating tank 410 and the second coal slime regulating tank 440 , and inputs the large-particle coal slime into the crusher 720 for crushing through the second guide plate 730 , and the small-particle coal slime obtained at the discharge port of the crusher 720 is input back into the first coal slime regulating tank 410 .

[0069] The frequency of the paste pump 5 is controlled by the amount of coal slime blending required for combustion in the furnace, thereby controlling the conveying speed of the conveyor belt 320, the opening of the first water valve 4211, and the second water valve 4221, to ensure that when the coal slime in the first coal slime regulating tank 410 or the second coal slime regulating tank 440 is completely discharged, the coal slime in the second coal slime regulating tank 440 or the first coal slime regulating tank 410 has been completely stirred.

[0070] Part of the flue gas in the main flue 610 is led to the branch flue 820. The air preheater 840 is set on the branch flue 820. Air is blown into the air preheater 840 by the blower 850. When the flue gas with heat in the branch flue 820 flows through the air preheater 840, it indirectly exchanges heat with the air in the air preheater 840, so that the air temperature is increased to obtain hot air. The hot air enters the antifreeze sleeve 810 through the hot air inlet of the antifreeze sleeve 810 through the pipeline, and is output from the hot air outlet and discharged into the atmosphere. A thermal insulation layer is formed on the outer periphery of the coal slime conveying pipe 510 to prevent the coal slime from agglomerating due to low temperature during transportation.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A circulating fluidized bed boiler coal sludge blending system, characterized in that: include: A coal slime bin (1), an elevator (2), a coal slime conveying unit, a coal slime regulating unit, a paste pump (5) and a furnace (6), wherein one end of the elevator (2) is arranged in the coal slime bin (1), the other end of the elevator (2) is higher than the side wall of the coal slime bin (1), a hopper is arranged on the elevator (2), a feed end of the coal slime conveying unit is located below a discharge end of the hopper of the elevator (2), a discharge end of the coal slime conveying unit is located above a feed port of the coal slime regulating unit, the discharge port of the coal slime regulating unit is connected to the furnace (6) via a coal slime conveying pipe (510), and the paste pump (5) is arranged on the coal slime conveying pipe (510); the upper part of the furnace (6) is connected in sequence with a main flue (610) and a chimney (620); An iron remover (210) is arranged above the coal slime conveying unit; The coal slime regulating unit comprises a first coal slime regulating tank (410), a water storage tank (420) and a first agitator (430); the outlet end of the coal slime conveying unit is located above a top feed port of the first coal slime regulating tank (410); the water storage tank (420) and the first coal slime regulating tank (410) are connected via a first water delivery pipeline (421); a first water valve (4211) is provided on the first water delivery pipeline (421); the discharge port of the first coal slime regulating tank (410) is connected to the furnace (6) via a coal slime conveying pipe (510); the discharge port of the first coal slime regulating tank (410) is provided with a first coal slime valve (4101); and the first agitator (430) is located in the first coal slime regulating tank (410).

2. The circulating fluidized bed boiler coal sludge blending system according to claim 1, characterized in that: The coal slime conveying unit comprises a first material guide plate (310) and a conveying belt (320); the first material guide plate (310) is arranged at an inclination, and the higher end of the first material guide plate (310) is located below the discharge end of the hopper of the elevator (2); the lower end of the first material guide plate (310) is located above the feed end of the conveying belt (320); and the discharge end of the conveying belt (320) is located above the first coal slime regulating tank (410).

3. The circulating fluidized bed boiler coal sludge blending system according to claim 1, characterized in that: The coal slime blending system is further provided with a crushing unit, the crushing unit comprising a grate (710) and a crusher (720), the grate (710) being obliquely arranged at the upper part of the coal slime regulating tank (410), the lower end of the grate (710) being connected to the feed port of the crusher (720) via a second guide plate (730), and the discharge port of the crusher (720) being connected to the top feed port of the first coal slime regulating tank (410).

4. The circulating fluidized bed boiler coal sludge blending system according to claim 1, characterized in that: The coal sludge blending system is also provided with an antifreeze unit, which includes an antifreeze sleeve (810), a branch flue (820), a flue gas regulating valve (830) and an air preheater (840); The antifreeze sleeve (810) is sleeved on the outer periphery of the coal sludge conveying pipe (510); one end of the branch flue (820) is communicated with the main flue (610); the other end of the branch flue (820) is communicated with an end of the main flue (610) close to the chimney (620); the air preheater (840) is arranged on the branch flue (820); one end of the air preheater (840) is communicated with the blower (850); the other end of the air preheater (840) is communicated with the hot gas inlet of the antifreeze sleeve (810); a hot gas outlet is provided at one end of the antifreeze sleeve (810) away from the hot gas inlet; and the flue gas regulating valve (830) is arranged on the branch flue (820).

5. The circulating fluidized bed boiler coal sludge blending system according to claim 2, characterized in that: The coal slime regulating unit further comprises a second coal slime regulating tank (440), a second agitator (450), a second water delivery pipeline (422), a coal slime delivery branch pipe (520) and a rotary chute (33); The second agitator (450) is located inside the second coal slime regulating tank (440); the second coal slime regulating tank (440) is connected to the water storage tank (420) via a second water pipeline (422); a second water valve (4221) is provided on the second water pipeline (422); the discharge port of the second coal slime regulating tank (440) is connected to the coal slime conveying pipe (510) via the coal slime conveying branch pipe (520); and a second coal slime valve (4401) is provided at the discharge port of the second coal slime regulating tank (440); The rotary chute (33) is obliquely arranged between the conveyor belt (320) and the first coal slime regulating tank (410); the higher end of the rotary chute (33) is located below the discharge end of the conveyor belt (320), and the lower end of the rotary chute (33) is located above the first coal slime regulating tank (410).

6. The circulating fluidized bed boiler coal sludge blending system according to claim 5, characterized in that: The rotary chute (33) comprises a rotary mechanism (330), a connecting rod (340), a support rod (350) and a chute (360), wherein two ends of the connecting rod (340) are respectively connected to the rotary mechanism (330) and the chute (360), and two ends of the support rod (350) are respectively connected to the connecting rod (340) and the chute (360), and the connecting rod (340), the support rod (350) and the chute (360) are connected in a triangle.

7. The circulating fluidized bed boiler coal sludge blending system according to claim 6, characterized in that: A first water content detector (4102) is provided in the first coal slime regulating tank (410), and a second water content detector (4402) is provided in the second coal slime regulating tank (440).

8. The circulating fluidized bed boiler coal sludge blending system according to claim 7, characterized in that: A first material level meter (4103) is provided in the first coal slime regulating tank (410), and a second material level meter (4403) is provided in the second coal slime regulating tank (440).

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