CN218107949U - Double-fan grinding device with adjusting valve - Google Patents
Double-fan grinding device with adjusting valve Download PDFInfo
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- CN218107949U CN218107949U CN202222371272.5U CN202222371272U CN218107949U CN 218107949 U CN218107949 U CN 218107949U CN 202222371272 U CN202222371272 U CN 202222371272U CN 218107949 U CN218107949 U CN 218107949U
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Abstract
The utility model discloses a double-fan grinding device with regulating valves, which comprises a hot blast stove, a mill, first to second dust collectors, first to second fans, a waste gas discharge pipeline and first to fourth regulating valves; the hot blast stove flue gas outlet is connected with the mill flue gas inlet, the mill discharge port is respectively connected with the first dust remover and the second dust remover, the first dust remover waste gas outlet is connected with the first fan gas inlet, and the first fan gas outlet is connected with the waste gas discharge pipeline; the waste gas outlet of the second dust remover is connected with the gas inlet of a second fan, and the gas outlet of the second fan is connected with the smoke inlet of the mill; a first regulating valve is added at the inlet of the first fan, and a second regulating valve is added at the inlet of the second fan; a pipeline is added to the exhaust emission pipeline at the air outlet of the second fan, and a third regulating valve is arranged on the added pipeline; and a fourth valve is arranged on a pipeline from the second fan to the mill. The invention can keep the system running under the extremely low air volume and increase the operation flexibility of the system.
Description
Technical Field
The utility model relates to a material grinding technical field specifically is a double fan grinding device with adjusting valve.
Background
The grinding system mainly comprises two types, namely a single-fan system and a double-fan system.
The single-fan system drives circulating air to reach an inlet of the mill by using the pressure difference between an outlet of the fan and the inlet of the mill, and a circulating air regulating valve is arranged on a circulating air pipeline to regulate the flow of the circulating air according to different working conditions. Thus, the circulating air control valve consumes a portion of the fan pressure and thus a portion of the main blower energy when the system is operating. On the other hand, in order to realize a larger flue gas circulation rate and reduce heat consumption, a chimney inlet valve (or a throttling device) is used for enabling a certain positive pressure to be formed at a fan outlet, and a sufficient pressure difference is formed between the positive pressure and a mill inlet, so that the flue gas is driven to self-circulate to the mill inlet. However, the stack inlet valve (or throttling device) also consumes a portion of the main blower pressure and thus a portion of the main blower energy.
The air at the outlet of the mill in the traditional double-fan system consists of circulating air and external air. The circulating air, namely the part of the air returning to the inlet of the mill through the first fan, needs to overcome the resistance of the first dust remover through the first fan; the outer exhaust, that is, the part of the air discharged outside through the second fan needs to overcome the resistance of the first dust remover through the first fan, and then the resistance of the second dust remover is overcome through the second fan. Under the condition of the same air quantity, the larger the resistance to be overcome, the larger the power consumed by the fan, so that the total power consumption of the traditional double-fan system is larger. In addition, in the traditional double-fan system, materials can be segregated in the first dust remover, the partial materials which are discharged from the exhaust port of the first dust remover along with flue gas and collected by the second dust remover can be very thin, the specific surface area of the materials can be increased relative to the outlet of the mill, the materials directly discharged from the discharge port of the first dust remover are relatively thick, two materials with different specific surfaces can be generated, and energy is wasted.
Patent CN111974535A discloses a double-fan grinding system, which does not need a circulating air valve on the circulating air pipeline, and also does not need a waste gas discharge pipeline, and the circulating air volume directly passes through the frequency of the circulating air valve, thereby reducing the energy consumption increased by the circulating air valve and the chimney inlet valve. However, this system also has the following problems: (1) After one fan is started, an opposite phase dragging load is formed for the other fan, the working frequency difference of the two fans is required to be smaller, otherwise, the fan with the smaller frequency has an overcurrent jump stop fault; (2) When the moisture content of the raw materials is increased suddenly and the heat supply of the hot blast stove needs to be increased immediately, the negative pressure of a hearth of the hot blast stove is reduced, and the combustion is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double fan grinding device with adjusting valve to the realization keeps the system operation under extremely low amount of wind, and increases the operational flexibility of system.
Realize the utility model discloses the technical solution of purpose does: a double-fan grinding device with regulating valves comprises a hot blast stove, a grinding machine, a first dust remover, a first fan, a second dust remover, a second fan, a waste gas discharge pipeline, a first regulating valve, a second regulating valve, a third regulating valve and a fourth regulating valve;
the hot blast stove flue gas outlet is connected with the mill flue gas inlet, the mill discharge port is respectively connected with the first dust remover feed inlet and the second dust remover feed inlet, the first dust remover waste gas outlet is connected with the first fan gas inlet, and the first fan gas outlet is connected with the waste gas discharge pipeline; the waste gas outlet of the second dust remover is connected with the gas inlet of a second fan, and the gas outlet of the second fan is connected with the smoke inlet of the mill through a return pipeline;
a first regulating valve is added at the inlet of the first fan, and a second regulating valve is added at the inlet of the second fan; a pipeline is added to the exhaust emission pipeline at the air outlet of the second fan, and a third regulating valve is arranged on the added pipeline; and a fourth valve is arranged on a pipeline from the second fan to the mill.
Furthermore, the first fan and the second fan adopt fans with different characteristics according to process requirements, frequency conversion adjustment is adopted, the air quantity and the rotating speed form a primary square relation, and the air pressure and the rotating speed form a quadratic relation.
Further, all the air volume of the outlet of the second fan enters the inlet of the mill, and all the air volume of the outlet of the second fan is completely self-circulation.
Furthermore, in a cold state, the working frequency difference between the first fan and the second fan is 5Hz-10Hz; and in a hot state, the frequency difference between the first fan and the second fan is 10-15Hz.
Furthermore, an air mixing pipeline and an air mixing pipe adjusting valve are arranged at the inlet of the mill and used for sucking atmosphere and cooling the mill.
Furthermore, the discharge port of the mill is provided with a one-to-two pipeline connection which is respectively connected to the first dust remover and the second dust remover.
Furthermore, a cylindrical air outlet cylinder is arranged at the top of the discharge port of the mill, and two outlets are formed in the side surface of the cylindrical air outlet cylinder and are respectively connected with a first dust remover and a second dust remover; and a guide plate is arranged at the bottom of the discharge port pipeline of the mill and used for changing the rotating flow field of the outlet of the mill powder concentrator into a vertical flow field and adjusting the airflow distribution of the two outlets.
Furthermore, the first dust remover adopts a bag-type dust remover, and the second dust remover adopts a cyclone dust remover.
Compared with the prior art, the utility model, it is showing the advantage and is: (1) The first regulating valve is added at the inlet of the first fan, the second regulating valve is added at the inlet of the second fan, and the system can be kept running under the condition of extremely low air volume through the common regulation of the two valves and the fan frequency; (2) A pipeline is added to the chimney at the outlet of the second fan, and a third valve is arranged on the pipeline; and a fourth valve is arranged on a pipeline from the second fan to the mill, so that the working range of the second fan is widened, and the operation flexibility of the system is increased.
Drawings
Fig. 1 is a schematic structural view of the double-fan grinding device with the regulating valve of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
With reference to fig. 1, the utility model relates to a double-fan grinding device with regulating valve, which comprises a hot-blast stove 1, a mill 2, a first dust remover 3, a first fan 4, a second dust remover 5, a second fan 6, a waste gas discharge pipeline 7, a first regulating valve 8, a second regulating valve 9, a third regulating valve 10 and a fourth regulating valve 11;
the flue gas outlet of the hot blast stove 1 is connected with the flue gas inlet of the mill 2, the discharge port of the mill 2 is respectively connected with the feed inlet of the first dust remover 3 and the feed inlet of the second dust remover 5, the waste gas outlet of the first dust remover 3 is connected with the gas inlet of the first fan 4, and the gas outlet of the first fan 4 is connected with the waste gas discharge pipeline 7; the waste gas outlet of the second dust remover 5 is connected with the gas inlet of a second fan 6, and the gas outlet of the second fan 6 is connected with the smoke inlet of the mill 2 through a return pipeline;
a first regulating valve 8 is added at the inlet of the first fan 4, and a second regulating valve 9 is added at the inlet of the second fan 6; a pipeline is added to an air outlet of the second fan 6 and is connected to a waste gas discharge pipeline 7, and a third regulating valve 10 is arranged on the added pipeline; a fourth valve is provided in the conduit from the second fan 6 to the mill 2.
As a specific example, fans with different characteristics are adopted for the first fan 4 and the second fan 6 according to process requirements, in order to save power consumption and heat consumption, a relatively large proportion of flue gas self-circulation rate is 65-80%, the first fan 4 and the second fan 6 both adopt variable frequency regulation, the air quantity and the rotating speed form a primary square relationship, the air pressure and the rotating speed form a quadratic relationship, and the output change of the fan total pressure is relatively large.
As a specific example, all the air quantity at the outlet of the second fan 6 enters the inlet of the mill 2, and all the air quantity at the outlet of the second fan 6 is completely self-circulating.
As a specific example, in the cold state, the operating frequency difference between the first fan 4 and the second fan 6 is 5Hz to 10Hz; and in a hot state, the frequency difference between the first fan 4 and the second fan 6 is 10-15Hz.
As a specific example, the grinding device keeps the system running under the extremely low air quantity through the common adjustment of the first fan 4, the second fan 6, the first regulating valve 8 and the second regulating valve 9.
As a specific example, the inlet of the mill 2 is provided with a hot air mixing pipeline and a hot air mixing pipeline regulating valve, and the hot air mixing pipeline is used for sucking atmospheric air to cool the mill 2.
As a specific example, the discharge port of the mill 2 is provided with a one-to-two pipe connection which is respectively connected to the first dust remover 3 and the second dust remover 5, and the feeding amount of the first dust remover 3 and the second dust remover 5 is adjusted through the first fan 4, the second fan 6, the first adjusting valve 8 and the second adjusting valve 9.
As a specific example, a cylindrical air outlet cylinder is arranged at the top of a discharge hole of the mill 2, two outlets are arranged on the side surface of the cylindrical air outlet cylinder, and the two outlets are respectively connected with a first dust remover 3 and a second dust remover 5; and a guide plate is arranged at the bottom of the discharge port pipeline of the mill 2 and used for changing a rotating flow field of an outlet of the powder concentrator of the mill 2 into a vertical flow field and adjusting the airflow distribution of the two outlets.
As a specific example, the mill 2 adopts a vertical mill, which integrates crushing, drying, grinding and grading conveying, and can grind block, granular and powdery raw materials into required powdery materials.
As a specific example, the first dust collector 3 employs a bag-type dust collector, and the second dust collector 5 employs a cyclone dust collector.
The utility model discloses double fan grinding device with adjusting valve, theory of operation and process are as follows:
the first adjusting valve 8 is additionally arranged at the inlet of the first fan 4, the second adjusting valve 9 is additionally arranged at the inlet of the second fan 6, and through the common adjustment of the two valves and the fan frequency, the system can be kept running under extremely low air volume, for example, the heating stage when the system is started or the roller lifting standby stage when the system is in fault, when the operation air volume requirement is extremely low, the air volume is reduced by reducing the fan frequency at the moment, and after a certain frequency is reached, the air volume is further reduced by reducing the opening degree of the first adjusting valve or the second adjusting valve at the inlet of the fan. The problem that after one fan is started, the other fan can form an anti-phase dragging load, the working frequency difference of the two fans is required to be smaller, and otherwise, the fan with the smaller frequency can generate an overcurrent tripping fault is avoided.
A pipeline is added to an air outlet of the second fan 6 and is connected to a waste gas discharge pipeline 7, and a third regulating valve 10 is arranged on the added pipeline; a fourth valve is arranged on the pipeline from the second fan 6 to the mill 2. This widens the working range of the second fan 6 and increases the operational flexibility of the system. For example, when the moisture content of the raw material is increased suddenly and the heat supply of the hot blast stove needs to be increased immediately, the negative pressure of a hearth of the hot blast stove is reduced, and the combustion is influenced. At this time, the negative pressure at the inlet of the mill needs to be increased so as to increase the negative pressure of the hearth. By reducing the opening of the fourth regulating valve, the opening of the third regulating valve is increased in time.
Claims (8)
1. A double-fan grinding device with an adjusting valve is characterized by comprising a hot blast stove (1), a grinding machine (2), a first dust remover (3), a first fan (4), a second dust remover (5), a second fan (6), a waste gas discharge pipeline (7), a first adjusting valve (8), a second adjusting valve (9), a third adjusting valve (10) and a fourth adjusting valve (11);
the flue gas outlet of the hot blast stove (1) is connected with the flue gas inlet of the mill (2), the discharge port of the mill (2) is respectively connected with the feeding port of the first dust remover (3) and the feeding port of the second dust remover (5), the waste gas outlet of the first dust remover (3) is connected with the gas inlet of the first fan (4), and the gas outlet of the first fan (4) is connected with the waste gas discharge pipeline (7); the waste gas outlet of the second dust remover (5) is connected with the gas inlet of a second fan (6), and the gas outlet of the second fan (6) is connected with the flue gas inlet of the mill (2) through a backflow pipeline;
a first regulating valve (8) is added at the inlet of the first fan (4), and a second regulating valve (9) is added at the inlet of the second fan (6); a pipeline is added to the exhaust emission pipeline (7) at the air outlet of the second fan (6), and a third regulating valve (10) is arranged on the added pipeline; and a fourth valve is arranged on a pipeline from the second fan (6) to the mill (2).
2. The double-fan grinding device with the adjusting valve according to claim 1, wherein the first fan (4) and the second fan (6) adopt fans with different characteristics according to process requirements, frequency conversion adjustment is adopted, air quantity and rotating speed are in a primary relation, and air pressure and rotating speed are in a quadratic relation.
3. The double-fan grinding device with the adjusting valve according to claim 1, wherein all air volume at the outlet of the second fan (6) enters the inlet of the mill (2), and all air volume at the outlet of the second fan (6) is completely self-circulating.
4. The double-fan grinding device with the regulating valve according to claim 1, wherein in a cold state, the working frequency difference between the first fan (4) and the second fan (6) is 5Hz-10Hz; and in a hot state, the frequency difference between the first fan (4) and the second fan (6) is 10-15Hz.
5. The double-fan grinding device with the adjusting valve is characterized in that an inlet of the grinding machine (2) is provided with an air charging pipeline and a cooling air charging pipe adjusting valve for sucking atmosphere to cool the grinding machine (2).
6. The double-fan grinding device with the adjusting valve according to claim 1, characterized in that the discharge port of the mill (2) is provided with a one-to-two pipe connection, which is respectively connected to the first dust remover (3) and the second dust remover (5).
7. The double-fan grinding device with the adjusting valve according to claim 1, characterized in that a cylindrical air-out cylinder is arranged at the top of the discharge hole of the mill (2), two outlets are arranged on the side surface of the cylindrical air-out cylinder, and the two outlets are respectively connected with a first dust remover (3) and a second dust remover (5); and a guide plate is arranged at the bottom of the discharge port pipeline of the mill (2) and used for changing the rotating flow field of the outlet of the powder concentrator of the mill (2) into a vertical flow field and adjusting the airflow distribution of the two outlets.
8. The double-fan grinding device with the adjusting valve according to claim 1, wherein the first dust collector (3) adopts a bag-type dust collector, and the second dust collector (5) adopts a cyclone dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222371272.5U CN218107949U (en) | 2022-09-07 | 2022-09-07 | Double-fan grinding device with adjusting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222371272.5U CN218107949U (en) | 2022-09-07 | 2022-09-07 | Double-fan grinding device with adjusting valve |
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| Publication Number | Publication Date |
|---|---|
| CN218107949U true CN218107949U (en) | 2022-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222371272.5U Active CN218107949U (en) | 2022-09-07 | 2022-09-07 | Double-fan grinding device with adjusting valve |
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| Country | Link |
|---|---|
| CN (1) | CN218107949U (en) |
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2022
- 2022-09-07 CN CN202222371272.5U patent/CN218107949U/en active Active
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