Fan device of double-chamber kiln

Abstract

The utility model discloses a double-hearth kiln fan device which is characterized in that one hearth of a first double-hearth kiln is connected with a first combustion-supporting fan through a first combustion-supporting air pipe, and the first combustion-supporting air pipe is sequentially provided with a first combustion-supporting air release valve and a first combustion-supporting air electric valve; one hearth of the second double-hearth kiln is connected with a second combustion-supporting fan through a second combustion-supporting air pipe, a second combustion-supporting air release valve and a second combustion-supporting air electric valve are sequentially installed on the second combustion-supporting air pipe, and the two ends of a combustion-supporting air branch pipe are connected with the first combustion-supporting air pipe and the second combustion-supporting air pipe respectively. And a third combustion-supporting air electric valve is mounted on the combustion-supporting air branch pipe. The double-chamber kiln fan device can effectively avoid energy waste caused by discharging of the fans in the reversing period, can synchronously achieve mutual standby of the kiln fans, reduces the failure rate of kiln equipment, and belongs to the technical field of steel manufacturing.

Description

Technical Field

[0001] This utility model belongs to the field of steel manufacturing technology, and specifically relates to a double-chamber kiln blower device. Background Technology

[0002] A double-chamber vertical kiln has two cylinders connected by a connecting channel located between them. The advantages of a double-chamber kiln are parallel flow and heat storage. "Parallel flow" means that during the calcination of the coal gas in the combustion cylinder, the coal gas, combustion air, and limestone flow downwards side-by-side, and the combustion flue gas also flows downwards, which is beneficial for producing high-quality active lime. "Heat storage" refers to the fact that the high-temperature flue gas—the fuel combustion products—enters the heat storage chamber through the connecting channel between the two kiln cylinders. In the heat storage chamber, the high-temperature flue gas flows upwards, transferring heat to the limestone raw material in the preheating zone, preheating the stone to a higher temperature. Simultaneously, the high-temperature exhaust gas, after heat exchange, cools down and is discharged into the atmosphere through a flue gas bag filter.

[0003] During combustion operation, the two kiln cylinders of the double-chamber kiln enter a "reversal period" every 12-14 minutes. Through valve operation, the functions of the combustion kiln cylinder and the regenerator kiln cylinder are switched; that is, while one kiln cylinder is in calcination mode, the other is in regenerator mode. Under normal conditions, the system supplies a large amount of coal gas and combustion air to the combustion chamber to ensure normal combustion, while the flue gas dust collector ensures a negative pressure environment at the top of the regenerator chamber. Therefore, the pressure in the combustion chamber is always higher than that in the regenerator chamber, allowing the high-temperature flue gas to flow smoothly into the regenerator chamber, achieving heat storage.

[0004] During the reversal period, the combustion air release valve and cooling air release valve open, allowing the airflow inside the kiln to be released to the atmosphere. However, the combustion air fan and cooling air fan maintain their original speeds during the reversal, resulting in the fans running idle. The daily reversal time for the double-chamber kiln is 45-100 seconds, with a cumulative cycle of 100 cycles. The total reversal time for each kiln per day is 4500-10000 seconds, or 1.25-2.78 hours.

[0005] Therefore, the current operation mode of double-chamber kilns results in significant energy waste. Utility Model Content

[0006] The purpose of this utility model is to provide a double-chamber kiln blower device, which can effectively avoid energy waste caused by the exhaust of the blower during the reversal period, and can realize the kiln blowers as backups for each other, thereby reducing the failure rate of kiln equipment.

[0007] The specific technical solution is as follows:

[0008] The double-chamber kiln blower unit includes:

[0009] The first double-chamber kiln has one chamber connected to the first combustion air blower via the first combustion air duct. The first combustion air release valve and the first combustion air electric valve are installed sequentially on the first combustion air duct. The first combustion air electric valve is located further away from the first double-chamber kiln than the first combustion air release valve.

[0010] The second double-chamber kiln has one chamber connected to the second combustion air blower via a second combustion air duct. The second combustion air release valve and the second combustion air electric valve are installed sequentially on the second combustion air duct. The position of the second combustion air electric valve on the second combustion air duct is farther from the second double-chamber kiln than the position of the second combustion air release valve on the second combustion air duct.

[0011] The combustion air branch pipe has two ends connected to the first combustion air pipe and the second combustion air pipe, respectively, and a third combustion air electric valve is installed on the combustion air branch pipe. The connection position between the combustion air branch pipe and the first combustion air pipe is located between the first combustion air electric valve and the first combustion air fan, and the connection position between the combustion air branch pipe and the second combustion air pipe is located between the second combustion air electric valve and the second combustion air fan.

[0012] Preferably, a first combustion air flow meter is installed on the first combustion air duct, and the first combustion air flow meter is located between the first combustion air release valve and the first double-chamber kiln.

[0013] Preferably, a second combustion air flow meter is installed on the second combustion air duct, and the second combustion air flow meter is located between the second combustion air release valve and the second double-chamber kiln.

[0014] Preferably, the first double-chamber kiln is connected to a first cooling fan, the first cooling fan and the first double-chamber kiln are connected through a first cooling air duct, and a first cooling air electric valve is installed on the first cooling air duct.

[0015] Preferably, the second double-chamber kiln is connected to a second cooling fan, and the second cooling fan is connected to the second double-chamber kiln through a second cooling air duct. A second cooling air electric valve is installed on the second cooling air duct.

[0016] Preferably, the first cooling duct and the second cooling duct are connected by a cooling duct branch pipe. The connection between the cooling duct branch pipe and the first cooling duct is located between the first cooling duct electric valve and the first cooling fan. The connection between the cooling duct branch pipe and the second cooling duct is located between the second cooling duct electric valve and the second cooling fan.

[0017] Preferably, a third electric cooling air valve is installed on the cooling air branch pipe.

[0018] Preferably, when the first double-chamber kiln and the second double-chamber kiln are in production, the third combustion air electric valve and the third cooling air electric valve are in the closed state, and the first combustion air electric valve, the second combustion air electric valve, the first cooling air electric valve, and the second cooling air electric valve are in the open state; when the first double-chamber kiln is in the reversing state, the first combustion air release valve, the third combustion air electric valve, and the third cooling air electric valve are in the open state, and the first combustion air electric valve and the first cooling air electric valve are in the closed state.

[0019] Compared with existing technologies, this utility model has the following beneficial effects:

[0020] This invention effectively avoids energy waste caused by the fan exhausting air during the reversal period by setting up combustion air branch pipes and cooling air branch pipes, and by ensuring that the start time of the reversal of the two kilns is greater than 30 seconds. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of the structure of a double-chamber kiln blower unit, in which the combustion air branch pipe connects the first combustion air pipe and the second combustion air pipe.

[0023] Figure 2 This is a schematic diagram of the structure of this utility model, wherein the cooling air branch pipe connects the first cooling air pipe and the second cooling air pipe.

[0024] Explanation of key figure labels:

[0025] 1 is the first combustion air blower, 2 is the second combustion air blower, 3 is the first cooling air blower, 4 is the second cooling air blower, 5 is the second cooling air duct, 6 is the first cooling air duct, 7 is the first double-chamber kiln, 8 is the second double-chamber kiln, 9 is cooling air, 10 is the second chamber, 11 is the first chamber, 12 is the first combustion air release valve, 13 is the first combustion air electric valve, 14 is the third combustion air electric valve, 15 is the combustion air branch pipe, 16 is the second combustion air electric valve, 17 is the first combustion air duct, 18 is the second combustion air release valve, 19 is the second combustion air duct, 20 is the first combustion air flow meter, 21 is the second combustion air flow meter, 22 is combustion air, 23 is the cooling air branch pipe, 24 is the third cooling air electric valve, 25 is the second cooling air electric valve, 26 is the first cooling air electric valve, 27 is the first cooling air flow meter, and 28 is the second cooling air flow meter. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0030] like Figures 1-2 As shown, this embodiment provides a double-chamber kiln blower device, comprising:

[0031] The first double-chamber kiln 7 has one chamber connected to the first combustion air blower 1 via the first combustion air duct 17. The first combustion air duct 17 is equipped with a first combustion air release valve 12 and a first combustion air electric valve 13. The first combustion air electric valve 13 is located further away from the first double-chamber kiln 7 than the first combustion air release valve 12.

[0032] The second double-chamber kiln 8 has one chamber connected to the second combustion air blower 2 via the second combustion air duct 19. The second combustion air duct 19 is equipped with a second combustion air release valve 18 and a second combustion air electric valve 16. The second combustion air electric valve 16 is located further away from the second double-chamber kiln 8 than the second combustion air release valve 18.

[0033] The combustion air branch pipe 15 is connected at both ends to the first combustion air pipe 17 and the second combustion air pipe 19, respectively. A third combustion air electric valve 14 is installed on the combustion air branch pipe 15. The connection position between the combustion air branch pipe 15 and the first combustion air pipe 17 is located between the first combustion air electric valve 13 and the first combustion air blower 1. The connection position between the combustion air branch pipe 15 and the second combustion air pipe 19 is located between the second combustion air electric valve 16 and the second combustion air blower 2.

[0034] It should be noted that before the first double-chamber kiln 7 and the second double-chamber kiln 8 are put into operation, the first double-chamber kiln 7 and the second double-chamber kiln 8 are set with the same combustion time and reversal time, and the reversal start time of the two kilns differs by more than 30 seconds.

[0035] The first double-chamber kiln 7 and the second double-chamber kiln 8 each have a first chamber 11 and a second chamber 10, which are connected. The first combustion air pipe 17 and the second combustion air pipe 19 are used to transport combustion air 22 into the first double-chamber kiln 7 and the second double-chamber kiln 8, respectively. The first cooling air pipe 6 and the second cooling air pipe 5 are used to transport cooling air 9 into the first double-chamber kiln 7 and the second double-chamber kiln 8, respectively.

[0036] A first combustion air flow meter 20 is installed on the first combustion air duct 17. The first combustion air flow meter 20 is located between the first combustion air release valve 12 and the first double-chamber kiln 7. The first combustion air flow meter 20 is interlocked with the first combustion air fan 1 to stabilize the air supply speed of the first combustion air fan 1 and the first cooling fan 3.

[0037] A second combustion air flow meter 21 is installed on the second combustion air duct 19. The second combustion air flow meter 21 is located between the second combustion air release valve 18 and the second double-chamber kiln 8. The second combustion air flow meter 21 is interlocked with the second combustion air fan 2 to stabilize the air supply speed of the second combustion air fan 2 and the second cooling fan 4.

[0038] The first double-chamber kiln 7 is connected to the first cooling fan 3. The first cooling fan 3 and the first double-chamber kiln 7 are connected through the first cooling air duct 6. The first cooling air duct 6 is equipped with the first cooling air electric valve 26.

[0039] The second double-chamber kiln 8 is connected to the second cooling fan 4. The second cooling fan 4 and the second double-chamber kiln 8 are connected through the second cooling air duct 5. The second cooling air duct 5 is equipped with a second cooling air electric valve 25.

[0040] The first cooling duct 6 and the second cooling duct 5 are connected by a cooling duct branch 23. The connection between the cooling duct branch 23 and the first cooling duct 6 is located between the first cooling duct electric valve 26 and the first cooling fan 3. The connection between the cooling duct branch 23 and the second cooling duct 5 is located between the second cooling duct electric valve 25 and the second cooling fan 4.

[0041] A first cooling air flow meter 27 is installed on the first cooling air duct 6, and a second cooling air flow meter 28 is installed on the second cooling air duct 5.

[0042] A third cooling air electric valve 24 is installed on the cooling air branch pipe 23.

[0043] When the first double-chamber kiln 7 and the second double-chamber kiln 8 are in production, the third combustion air electric valve 14 and the third cooling air electric valve 24 are in the closed state, while the first combustion air electric valve 13, the second combustion air electric valve 16, the first cooling air electric valve 26 and the second cooling air electric valve 25 are in the open state. The first combustion air electric valve 13, the second combustion air electric valve 16, the first cooling fan 3 and the second cooling fan 4 all normally send air into the kiln.

[0044] After combustion in the first chamber 11 of the first double-chamber kiln 7 is completed and the first double-chamber kiln 7 is in the reversing state, the first combustion air release valve, the third combustion air electric valve 14, and the third cooling air electric valve 24 are in the open state, while the first combustion air electric valve 13 and the first cooling air electric valve 26 are in the closed state. The first combustion air fan 1 and the second combustion air fan 2 of the first double-chamber kiln 7 and the second double-chamber kiln 8 reduce their speed by frequency conversion, and the combustion air and cooling air are sent into the second double-chamber kiln 8 to achieve stable airflow from the fans.

[0045] When the first double-chamber kiln 7 finishes reversing and enters the combustion time, the first combustion air release valve 12 of the first double-chamber kiln 7 closes, the third combustion air electric valve 14 closes, the third cooling air electric valve 24 closes, the first combustion air electric valve 13 opens, and the first cooling air electric valve 26 opens. The first combustion air fan 1 and the second combustion air fan 2 of the first double-chamber kiln 7 and the second double-chamber kiln 8 increase their operating speed through frequency conversion, and the combustion air and cooling air are sent into the first double-chamber kiln 7 to achieve stable fan airflow.

[0046] The valves mentioned in the above embodiments can be pneumatic or hydraulically powered, and driven by electric control to ensure rapid valve response.

[0047] Through the above-described structure (combustion air branch pipe 15, cooling air branch pipe 23) and operating mode, energy waste caused by exhaust during fan reversal is effectively avoided. Assuming each kiln has 3 combustion air fans (160 kW / h) and 3 cooling air fans (132 kW / h), it is estimated that daily electricity savings will be 3 units × (160 kW / h + 132 kW / h) × 24 hours × 0.6 yuan / kWh = 12,600 yuan. Each system can reduce costs by 4,604,300 yuan annually. Simultaneously, by installing this device, kiln fans can be used as backups for each other, reducing the kiln equipment failure rate.

[0048] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A twin kiln fan arrangement, characterised in that, include: The first double-chamber kiln has one chamber connected to the first combustion air blower via the first combustion air duct. The first combustion air release valve and the first combustion air electric valve are installed sequentially on the first combustion air duct. The first combustion air electric valve is located further away from the first double-chamber kiln than the first combustion air release valve. The second double-chamber kiln has one chamber connected to the second combustion air blower via a second combustion air duct. The second combustion air release valve and the second combustion air electric valve are installed sequentially on the second combustion air duct. The position of the second combustion air electric valve on the second combustion air duct is farther from the second double-chamber kiln than the position of the second combustion air release valve on the second combustion air duct. The combustion air branch pipe has two ends connected to the first combustion air pipe and the second combustion air pipe, respectively, and a third combustion air electric valve is installed on the combustion air branch pipe. The connection position between the combustion air branch pipe and the first combustion air pipe is located between the first combustion air electric valve and the first combustion air fan, and the connection position between the combustion air branch pipe and the second combustion air pipe is located between the second combustion air electric valve and the second combustion air fan.

2. The twin kiln fan arrangement of claim 1, wherein, A first combustion air flow meter is installed on the first combustion air duct, and the first combustion air flow meter is located between the first combustion air release valve and the first double-chamber kiln.

3. The twin kiln fan arrangement of claim 1, wherein, A second combustion air flow meter is installed on the second combustion air duct, and the second combustion air flow meter is located between the second combustion air release valve and the second double-chamber kiln.

4. The twin-muffle kiln fan arrangement of any one of claims 1-3, wherein, The first double-chamber kiln is connected to a first cooling fan, which is connected to the first double-chamber kiln via a first cooling duct. A first cooling electric valve is installed on the first cooling duct.

5. The twin kiln fan arrangement of claim 4, wherein, The second double-chamber kiln is connected to a second cooling fan, which is connected to the second double-chamber kiln via a second cooling duct. A second cooling electric valve is installed on the second cooling duct.

6. The twin kiln fan arrangement of claim 5, wherein, The first cooling duct and the second cooling duct are connected by a cooling duct branch pipe. The connection between the cooling duct branch pipe and the first cooling duct is located between the first cooling duct electric valve and the first cooling fan. The connection between the cooling duct branch pipe and the second cooling duct is located between the second cooling duct electric valve and the second cooling fan.

7. The twin kiln fan arrangement of claim 6, wherein, A third electric cooling air valve is installed on the cooling air branch pipe.

8. The twin kiln fan arrangement of claim 7, wherein, When the first and second double-chamber kilns are in production, the third combustion air electric valve and the third cooling air electric valve are in the closed state, and the first combustion air electric valve, the second combustion air electric valve, the first cooling air electric valve, and the second cooling air electric valve are in the open state; when the first double-chamber kiln is in the reversing state, the first combustion air release valve, the third combustion air electric valve, and the third cooling air electric valve are in the open state, and the first combustion air electric valve and the first cooling air electric valve are in the closed state.

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