Fly ash feeding system

Abstract

The utility model belongs to the technical field of cement preparation, and relates to a fly ash feeding system. Comprising a fly ash bin, a homogenizing silo, a front preheater, a decomposing furnace and a rear preheater which are sequentially arranged, a blanking valve is arranged at the bottom of the fly ash bin, and the fly ash bin is connected with the homogenizing silo through a homogenizing silo fly ash conveying mechanism; the decomposing furnace fly ash weighing device is arranged at the bottom of the fly ash bin, the material input end of the decomposing furnace fly ash conveying mechanism is communicated with the decomposing furnace fly ash weighing device, the material output end of the decomposing furnace fly ash conveying mechanism is connected with the decomposing furnace, and a decomposing furnace fly ash feeding valve is arranged on the decomposing furnace fly ash conveying mechanism. According to the coal ash conveying mechanism of the decomposing furnace, part of coal ash is directly conveyed into the decomposing furnace, due to the fact that enough temperature and oxygen exist in the decomposing furnace, CO generated by combustion of the coal ash in the front preheater can be effectively reduced, normal work of the decomposing furnace can be guaranteed, and energy is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cement preparation technical field, especially a fly ash feeding system. BACKGROUND

[0002] With the rapid development of economy in recent years, a large number of engineering constructions are carried out in various places to meet the social production or living needs, and cement is an indispensable building material for engineering construction. Cement is formed by mixing raw materials such as fly ash in proportion. The product of the raw material calcined at about 1450 DEG C is clinker, and the cement is formed by mixing the clinker and gypsum in proportion and grinding.

[0003] CN104773967A discloses a cement clinker calcination method, which utilizes various preheaters to preheat the raw material, then sends it into the decomposing furnace for decomposition, and finally sends it into the rotary kiln for calcination. The raw material exchanges heat with hot air in the preheater to increase the temperature of the raw material and dry the raw material, and the hot air is discharged through the outlet and enters the subsequent waste gas treatment system. However, it is found through research that the fly ash in the raw material starts to burn in the third stage preheater, and the oxygen content in the preheater is very low, so the fly ash combustion is not sufficient, a large amount of CO is generated, and the CO concentration at the outlet of the preheater is too high. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, provide a fly ash feeding system, directly send part of the fly ash into the decomposing furnace, reduce CO generation, and reduce fuel consumption.

[0005] The technical scheme adopted by the utility model to solve its technical problem is: the fly ash feeding system comprises fly ash bins, homogenizing bins, front preheaters, decomposing furnaces and rear preheaters arranged in sequence, the bottom of the fly ash bin is provided with a material dropping valve, the fly ash bin is connected with the homogenizing bin through a fly ash conveying mechanism of the homogenizing bin, characterized in that: it further comprises a fly ash weighing device of the decomposing furnace and a fly ash conveying mechanism of the decomposing furnace, the fly ash weighing device of the decomposing furnace is arranged at the bottom of the fly ash bin, the material input end of the fly ash conveying mechanism of the decomposing furnace is communicated with the fly ash weighing device of the decomposing furnace, the material output end of the fly ash conveying mechanism of the decomposing furnace is connected with the decomposing furnace, and the fly ash conveying mechanism of the decomposing furnace is provided with a fly ash feeding valve of the decomposing furnace.

[0006] Preferably, the material output end of the fly ash conveying mechanism of the decomposing furnace is connected to the middle part of the decomposing furnace. The fly ash conveying mechanism of the decomposing furnace is communicated with the middle part of the decomposing furnace, so as to ensure that the fly ash is fully mixed in the decomposing furnace.

[0007] Preferably, the homogenizing bin fly ash conveying mechanism comprises a homogenizing bin fly ash feeding pipe, one end of the homogenizing bin fly ash feeding pipe is communicated with the discharge end of the decomposing furnace fly ash weighing device, the other end of the homogenizing bin fly ash feeding pipe is communicated with the homogenizing bin, and the homogenizing bin fly ash feeding pipe is provided with a homogenizing bin fly ash feeding valve.

[0008] The decomposing furnace fly ash conveying mechanism comprises a fan, an air inlet pipe and a decomposing furnace fly ash feeding pipe, one end of the air inlet pipe is connected with the fan, the other end of the air inlet pipe is communicated with the air inlet of the decomposing furnace fly ash weighing device, one end of the decomposing furnace fly ash feeding pipe is communicated with the decomposing furnace fly ash weighing device, and the other end of the decomposing furnace fly ash feeding pipe is connected with the decomposing furnace.

[0009] Preferably, the decomposing furnace fly ash weighing device is a rotor scale, a conical hopper is arranged at the discharge end of the rotor scale, the diameter of the conical hopper gradually decreases from top to bottom, and one end of the homogenizing bin fly ash feeding pipe is communicated with the upper part of the conical hopper.

[0010] Preferably, the lower end of the conical hopper is connected with the discharge end of the rotor scale through an expansion joint.

[0011] Preferably, the lower side of the fly ash bin is provided with a support frame, a cross beam is fixed on the support frame, the rotor scale is fixed on the lower side of the cross beam, a support seat is arranged on one side of the cross beam, an expansion joint is arranged in the middle part of the air inlet pipe, and the expansion joint is arranged on the support seat.

[0012] Preferably, the fan is a Roots fan.

[0013] Preferably, the homogenizing bin fly ash conveying mechanism comprises a stirring bin and a decomposing furnace fly ash feeding pipe, the stirring bin is communicated with the lower side of the fly ash bin, the decomposing furnace fly ash feeding pipe is communicated with the stirring bin and the homogenizing bin respectively, the decomposing furnace fly ash feeding pipe is a negative pressure conveying pipe, the decomposing furnace fly ash feeding pipe is connected with an air extraction fan, and a negative pressure is formed in the pipe, so that the fly ash is conveyed.

[0014] A homogenizing bin material weighing device is arranged between the decomposing furnace fly ash feeding pipe and the homogenizing bin, or a homogenizing bin material weighing device is arranged in the homogenizing bin.

[0015] Preferably, the front preheater comprises a first preheater, a second preheater, a third preheater and a fourth preheater which are sequentially connected in series, the homogenizing bin is connected with the first preheater, and the fourth preheater is connected with the decomposing furnace.

[0016] The rear preheater is a fifth preheater, and the fifth preheater is connected with the discharge port of the decomposing furnace.

[0017] Compared with the prior art, the technical scheme has the beneficial effects that:

[0018] The utility model discloses a setting the decomposition furnace fly ash conveying mechanism between the fly ash bin and the decomposition furnace, and the decomposition furnace fly ash conveying mechanism directly sends part fly ash into the decomposition furnace, because the decomposition furnace contains enough oxygen, can effectively reduce the CO produced by the combustion of fly ash in the front preheater, and simultaneously sends fly ash to the homogenizing storehouse and the decomposition furnace, avoids the heat absorption of all fly ash sent into the decomposition furnace to cause the decomposition furnace unable to work normally, can ensure the normal work of the decomposition furnace, can reduce the production of CO, and the combustion of fly ash sent into the decomposition furnace can replace a part of fuel, reduces the cost, reduces the emission. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic diagram of the utility model one kind for fly ash feeding system embodiment 1.

[0020] Figure 2 It is Figure 1 It is the local enlarged view of A in the middle.

[0021] Figure 3 It is the structure schematic diagram of the utility model one kind for fly ash feeding system embodiment 2.

[0022] Wherein: 1, fly ash bin;2, homogenizing storehouse;3, decomposition furnace;4, homogenizing storehouse fly ash feeding pipe;5, decomposition furnace fly ash feeding pipe;6, homogenizing storehouse fly ash feeding valve;7, decomposition furnace fly ash feeding valve;8, blanking valve;9, rotor scale;10, support frame;11, fan;12, air inlet pipe;13, conical hopper;14, crossbeam;15, first expansion joint;16, support seat;17, second expansion joint;18, stirring bin;19, first preheater;20, second preheater;21, third preheater;22, fourth preheater;23, fifth preheater. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings Figures 1-3 Further illustrate the utility model.

[0024] Embodiment 1

[0025] Refer to Figures 1-2 The fly ash feeding system includes fly ash bin 1, homogenizing storehouse 2, front preheater, decomposition furnace 3 and rear preheater arranged in sequence, and the bottom of fly ash bin 1 is provided with blanking valve 8, fly ash bin 1 is connected with homogenizing storehouse 2 through homogenizing storehouse fly ash conveying mechanism, fly ash in fly ash bin 1 is sent into homogenizing storehouse 2 through homogenizing storehouse fly ash conveying mechanism, is uniformly mixed with other materials and is sent into front preheater to be preheated, then is sent into decomposition furnace 3 to burn and decompose, is sent into rear preheater again, and finally is sent into rotary kiln. The rotary kiln part is not involved in the application, so the rotary kiln is not shown in the figure.

[0026] The front preheater comprises a first preheater 19, a second preheater 20, a third preheater 21 and a fourth preheater 22 connected in series, the homogenizing bin 2 is connected to the first preheater 19, and the fourth preheater 22 is connected to the decomposing furnace 3; the rear preheater is a fifth preheater 23, and the fifth preheater 23 is connected to the discharge port of the decomposing furnace 3.

[0027] The homogenizing bin fly ash conveying mechanism comprises a homogenizing bin fly ash feeding pipe 4, one end of the homogenizing bin fly ash feeding pipe 4 is communicated with the discharge end of the decomposing furnace fly ash weighing device, the other end is communicated with the homogenizing bin 2, and the homogenizing bin fly ash feeding pipe 4 is provided with a homogenizing bin fly ash feeding valve 6.

[0028] Figure 1 The solid line represents a powder conveying pipeline, and the dashed line represents a hot air pipeline. The hot air in the decomposing furnace 3 passes through the fifth preheater 23, the fourth preheater 22, the third preheater 21, the second preheater 20 and the first preheater 19 in sequence to heat and dry the material in the preheater, and then is discharged. In this process, the fly ash entering the preheater from the homogenizing bin 2 starts to burn at the third preheater 21, but the oxygen content in the preheater is low, and a large amount of CO produced by incomplete combustion of the fly ash is discharged through the first preheater 19.

[0029] The embodiment adds a decomposing furnace fly ash weighing device at the lower part of the fly ash bin 1, and a decomposing furnace fly ash conveying mechanism is arranged between the decomposing furnace fly ash weighing device and the decomposing furnace 3. The material input end of the decomposing furnace fly ash conveying mechanism is communicated with the decomposing furnace fly ash weighing device, the material output end of the decomposing furnace fly ash conveying mechanism is connected to the decomposing furnace 3, and the decomposing furnace fly ash conveying mechanism is provided with a decomposing furnace fly ash feeding valve 7. Part of the weighed fly ash is directly sent into the decomposing furnace 3 through the decomposing furnace fly ash conveying mechanism for combustion.

[0030] The fly ash feeding system of the present application directly sends part of the fly ash into the decomposing furnace 3 through the weighing, and the decomposing furnace is not oxygen-deficient, so CO is not produced, thereby effectively reducing the amount of CO produced by the first preheater 19. However, if all the fly ash is sent into the decomposing furnace 3, not only the material is uneven, but also the normal work of the decomposing furnace 3 is affected due to heat absorption of the fly ash. Therefore, it is necessary to control the amount of fly ash sent into the decomposing furnace 3 through the decomposing furnace fly ash weighing device.

[0031] Specifically, the decomposing furnace fly ash weighing device is a rotor scale 9, and a conical hopper 13 is arranged at the discharge end of the rotor scale 9. The diameter of the conical hopper 13 gradually decreases from top to bottom.

[0032] The pulverized coal ash conveying mechanism of the decomposing furnace comprises a fan 11, an air inlet pipe 12 and a pulverized coal ash feeding pipe 5 of the decomposing furnace. One end of the air inlet pipe 12 is connected with the fan 11, and the other end is communicated with an air inlet of the rotor scale 9. One end of the pulverized coal ash feeding pipe 5 of the decomposing furnace is communicated with the upper part of the conical hopper 13, and the other end is connected with the decomposing furnace 3. The pulverized coal ash feeding valve 7 of the decomposing furnace is arranged on the pulverized coal ash feeding pipe 5 of the decomposing furnace. The discharge end of the rotor scale 9 is arranged at the upper part, and the air inlet is arranged at the lower part. The airflow generated by the fan 11 enters the rotor scale 9 through the air inlet of the lower part of the rotor scale 9 via the air inlet pipe 12, and drives the pulverized coal ash to be discharged from the discharge end of the upper part of the rotor scale 9 and enter the conical hopper 13.

[0033] The blanking valve 8 in the embodiment is a gate valve, and the fan 11 is preferably a Roots blower. In order to ensure normal conveying of the material, one fan 11 is preferably arranged on each side of the air inlet pipe 12, one in use and one as a backup.

[0034] The other end of the pulverized coal ash feeding pipe 5 of the decomposing furnace is connected with the middle part of the decomposing furnace 3, so as to ensure that the pulverized coal ash is fully mixed with other materials in the decomposing furnace 3.

[0035] A support frame 10 is arranged on the lower side of the pulverized coal ash bin 1. A cross beam 14 is fixed on the support frame 10. The rotor scale 9 is fixed on the lower side of the cross beam 14. A support seat 16 is arranged on one side of the cross beam 14. A first expansion joint 15 is arranged in the middle part of the air inlet pipe 12 and is arranged on the support seat 16. The lower end of the conical hopper 13 is connected with the discharge end of the rotor scale 9 via a second expansion joint 17.

[0036] Working process: The pulverized coal ash feeding valve 7 of the decomposing furnace is closed, the pulverized coal ash feeding valve 6 of the homogenizing bin is opened, and according to the cement batching requirement, part of the pulverized coal ash in the pulverized coal ash bin 1 is sent into the homogenizing bin 2 via the pulverized coal ash feeding pipe 4 of the homogenizing bin, is uniformly mixed with other materials, is then sent into the first preheater 19, the second preheater 20, the third preheater 21 and the fourth preheater 22 for step-by-step preheating and drying, is then sent into the decomposing furnace 3 for combustion and decomposition, is then sent into the fifth preheater 23, and is finally sent into the rotary kiln.

[0037] When the weight of the pulverized coal ash in the homogenizing bin 2 reaches a certain value, the pulverized coal ash feeding valve 6 of the homogenizing bin is closed, the pulverized coal ash feeding valve 7 of the decomposing furnace is opened, and the fan 11 and the rotor scale 9 start to work. Another part of the pulverized coal ash is weighed and measured by the rotor scale 9 and is then directly sent into the decomposing furnace 3 via the pulverized coal ash feeding pipe 5 of the decomposing furnace. The amount of the pulverized coal ash directly sent into the decomposing furnace 3 is transported to the decomposing furnace 3 at a maximum of 10 t / h, which can meet the proportion of the pulverized coal ash in the raw material. Directly sending part of the pulverized coal ash into the middle part of the decomposing furnace 3 for combustion can not only reduce the CO generated due to insufficient combustion, but also can replace part of the raw materials, reduce the cost and reduce the emission.

[0038] Embodiment 2

[0039] Referring toFigure 3 The homogenizing library fly ash conveying mechanism in the embodiment comprises a stirring bin 18 and a homogenizing library fly ash feeding pipe 4, the stirring bin 18 is communicated with one side of the lower part of the fly ash bin 1, and the stirring bin 18 is arranged on the upper part of the material falling valve 8, the homogenizing library fly ash feeding pipe 4 is communicated with the stirring bin 18 and the homogenizing library 2 respectively at two ends, the homogenizing library fly ash feeding pipe 4 is a negative pressure conveying pipe, and the fly ash in the stirring bin 18 is directly conveyed into the homogenizing library 2 by using negative pressure. The fly ash falling from the fly ash bin 1 can be dispersed by the stirring bin 18, so that the fly ash is conveniently conveyed by negative pressure, the direct negative pressure conveying has higher efficiency, can meet the requirement of conveying a large amount of fly ash, and fly ash can be simultaneously conveyed into the homogenizing library 2 and the decomposition furnace 3.

[0040] The decomposition furnace fly ash feeding pipe 4 is connected with the air draught fan, and negative pressure is formed in the decomposition furnace fly ash feeding pipe 4, so that the fly ash is conveyed, and the negative pressure conveying is prior art, which is not described herein.

[0041] The homogenizing library fly ash conveying mechanism in the embodiment comprises a stirring bin 18 and a homogenizing library fly ash feeding pipe 4, the stirring bin 18 is communicated with one side of the lower part of the fly ash bin 1, and the stirring bin 18 is arranged on the upper part of the material falling valve 8, the homogenizing library fly ash feeding pipe 4 is communicated with the stirring bin 18 and the homogenizing library 2 respectively at two ends, the homogenizing library fly ash feeding pipe 4 is a negative pressure conveying pipe, and the fly ash in the stirring bin 18 is directly conveyed into the homogenizing library 2 by using negative pressure. The fly ash falling from the fly ash bin 1 can be dispersed by the stirring bin 18, so that the fly ash is conveniently conveyed by negative pressure, the direct negative pressure conveying has higher efficiency, can meet the requirement of conveying a large amount of fly ash, and fly ash can be simultaneously conveyed into the homogenizing library 2 and the decomposition furnace 3.

[0042] The structure of the decomposition furnace fly ash conveying mechanism in the embodiment is the same as that in embodiment 1, the fly ash in the fly ash bin 1 is directly conveyed into the homogenizing library 2 through the stirring bin 18 and the homogenizing library fly ash feeding pipe 4, and the other part of the fly ash is directly conveyed into the decomposition furnace 3 through the decomposition furnace fly ash feeding pipe 5 after being weighed and measured by the rotor scale 9.

[0043] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification made on the above embodiments according to the technical essence of the present application without departing from the technical scheme of the present application still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A fly ash feeding system, comprising a fly ash bin (1), a homogenizing bin (2), a front preheater, a decomposition furnace (3) and a rear preheater arranged in sequence, wherein the bottom of the fly ash bin (1) is provided with a discharging valve (8), and the fly ash bin (1) is connected with the homogenizing bin (2) through a fly ash conveying mechanism of the homogenizing bin, characterized in that: The device further comprises a decomposing furnace fly ash weighing device and a decomposing furnace fly ash conveying mechanism.

2. A fly ash feeding system as claimed in claim 1, wherein: The material output end of the decomposing furnace fly ash conveying mechanism is connected to the middle part of the decomposing furnace (3).

3. A fly ash feeding system as claimed in claim 1, wherein: The homogenizing bin fly ash conveying mechanism comprises a homogenizing bin fly ash feeding pipe (4), one end of which is communicated with the discharge end of the decomposing furnace fly ash weighing device, and the other end of which is communicated with the homogenizing bin (2), and the homogenizing bin fly ash feeding pipe (4) is provided with a homogenizing bin fly ash feeding valve (6). The decomposing furnace fly ash conveying mechanism comprises a fan (11), an air inlet pipe (12) and a decomposing furnace fly ash feeding pipe (5), one end of the air inlet pipe (12) is connected to the fan (11), the other end of the air inlet pipe (12) is communicated with the air inlet of the decomposing furnace fly ash weighing device, and one end of the decomposing furnace fly ash feeding pipe (5) is communicated with the decomposing furnace fly ash weighing device, and the other end of the decomposing furnace fly ash feeding pipe (5) is connected to the decomposing furnace (3).

4. A fly ash feeding system as claimed in claim 3, wherein: The decomposing furnace fly ash weighing device is a rotor scale (9), and a conical hopper (13) is arranged at the discharge end of the rotor scale (9), the diameter of the conical hopper (13) gradually decreases from top to bottom, and one end of the homogenizing bin fly ash feeding pipe (4) is communicated with the upper part of the conical hopper (13).

5. A fly ash feeding system as claimed in claim 4, wherein: The lower end of the conical hopper (13) is connected to the discharge end of the rotor scale (9) through an expansion joint.

6. A fly ash feeding system as claimed in claim 4, wherein: The lower side of the fly ash bin (1) is provided with a support frame (10), the support frame (10) is fixed with a cross beam (14), the rotor scale (9) is fixed to the lower side of the cross beam (14), a support seat (16) is arranged on one side of the cross beam (14), the middle part of the air inlet pipe (12) is provided with an expansion joint, and the expansion joint is arranged on the support seat (16).

7. A fly ash feeding system as claimed in claim 3, wherein: The fan (11) is a Roots blower.

8. A fly ash feeding system as claimed in claim 1, wherein: The homogenizing bin fly ash conveying mechanism comprises a stirring bin (18) and a decomposing furnace fly ash feeding pipe (5), the stirring bin (18) is communicated with the lower side of the fly ash bin (1), the decomposing furnace fly ash feeding pipe (5) is communicated with the stirring bin (18) and the homogenizing bin (2) respectively, and the decomposing furnace fly ash feeding pipe (5) is a negative pressure conveying pipe. A homogenizing bin material weighing device is arranged between the decomposing furnace fly ash feeding pipe (5) and the homogenizing bin (2), or a homogenizing bin material weighing device is arranged in the homogenizing bin (2).

9. A fly ash feeding system as claimed in claim 1, wherein: The front preheater comprises a first preheater (19), a second preheater (20), a third preheater (21) and a fourth preheater (22) which are sequentially connected in series, the homogenizing bin (2) is connected to the first preheater (19), and the fourth preheater (22) is connected to the decomposing furnace (3). The rear preheater is a fifth preheater (23), and the fifth preheater (23) is connected to the discharge port of the decomposing furnace (3).

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