CN221166596U

CN221166596U - Automatic regulating system for large gate of hot blast stove flue

Info

Publication number: CN221166596U
Application number: CN202323198712.2U
Authority: CN
Inventors: 王飞; 高浩然; 霍建
Original assignee: Jiangsu Changqiang Steel Co ltd
Current assignee: Jiangsu Changqiang Steel Co ltd
Priority date: 2023-11-27
Filing date: 2023-11-27
Publication date: 2024-06-18
Anticipated expiration: 2033-11-27

Abstract

The utility model discloses an automatic large gate adjusting system for a hot blast stove flue, which comprises a hot blast stove, a large flue, a PLC system and a chimney, wherein the hot blast stove is communicated with the large flue, a first shunt pipe, a second shunt pipe, a pressure gauge and the large gate of the flue are sequentially arranged on the large flue, the tail end of the first shunt pipe is connected to a coal spraying mill, and the tail end of the second shunt pipe is connected to a connecting pipe of a preheater port; the utility model has reasonable structural design and convenient use, monitors and judges the pressure of the flue of the hot blast stove in real time, and automatically and interlockingly controls the large gate of the flue to adjust the opening degree, thereby achieving the effects of preventing the problems of low hot air temperature, increased fuel consumption, waste of flue gas waste heat, increased oxygen content of the flue gas and the like caused by unsmooth flue gas discharge or insufficient supply.

Description

Automatic regulating system for large gate of hot blast stove flue

Technical Field

The utility model relates to the field of ferrous metallurgical equipment, in particular to an automatic large gate adjusting system for a hot blast stove flue.

Background

The flue gas discharged by the hot blast stove matched with the ironmaking blast furnace is generally conveyed to downstream users such as a coal injection mill and a preheater for waste heat utilization through a large flue, if redundant flue gas exists or the downstream users stop waste heat utilization, the flue gas needs to be conveyed to a chimney for discharge through the large flue, a manual flue large gate is usually arranged on the traditional large flue, a manual valve is manually opened when the flue gas is redundant, and the manual valve is required to be manually opened or not adjusted to a proper position according to experience, so that the inconvenience is overcome, in the daily production process, the fluctuation of the combustion intensity of the hot blast furnace, the variation of the usage amount of the downstream users and the like can cause larger fluctuation of the generation amount and the discharge amount of the combustion flue gas, if the generation amount of the flue gas is increased or the usage amount of the downstream users is reduced, the flue gas is not smoothly discharged, the flue gas is accumulated in the flue, the high-temperature flue gas generated by combustion at the upper part of the hot blast furnace cannot be smoothly discharged, the combustion effect of the hot blast furnace is directly influenced, the hot blast temperature of the blast furnace is reduced, and the consumption is increased. Otherwise, the flue will generate too high negative pressure, on one hand, the downstream user may be disconnected, and in addition, external air may be inhaled from unsealed positions such as the manhole, so that the temperature of the flue gas is reduced, the oxygen content is increased, and the use effect of the downstream user is affected. Thus, improvements are still needed.

Disclosure of utility model

The utility model provides an automatic large gate regulating system for a hot blast stove flue, which comprises a hot blast stove, a large flue, a PLC system and a chimney, wherein the hot blast stove is communicated with the large flue, a first shunt pipe, a second shunt pipe, a pressure gauge and the large gate of the flue are sequentially arranged on the large flue, the tail end of the first shunt pipe is connected to a coal-spraying mill, the tail end of the second shunt pipe is connected to a preheater port connecting pipe, the outlet end of the preheater port connecting pipe is communicated with the chimney, an electric actuator is arranged on the large gate of the flue, the PLC system is connected with the pressure gauge and the electric actuator, and the tail end of the large flue is communicated with the chimney.

Preferably, a preheater is arranged at the junction of the second shunt pipe and the preheater port connecting pipe.

The beneficial effects of the utility model are as follows: the utility model has reasonable structural design and convenient use, monitors and judges the pressure of the flue of the hot blast stove in real time, and automatically and interlockingly controls the large gate of the flue to adjust the opening degree, thereby achieving the effects of preventing the problems of low hot air temperature, increased fuel consumption, waste of flue gas waste heat, increased oxygen content of the flue gas and the like caused by unsmooth flue gas discharge or insufficient supply.

Drawings

The utility model will now be described by way of example and with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the overall structure of the present utility model;

In the figure: 1. hot blast stove; 2. a large flue; 4. A coal injection mill; 5. a preheater; 6. a preheater port connecting tube; 7. a first shunt tube; 8. a second shunt tube; 9. a pressure gauge; 10. a PLC system; 11. a flue large gate; 12. an electric actuator; 13. and (5) a chimney.

Detailed Description

All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.

Any feature of the present description may be replaced by alternative features serving the same or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.

The automatic large gate regulating system for the hot blast stove flue comprises a hot blast stove 1, a large flue 2, a PLC system 10 and a chimney 13, wherein the hot blast stove 1 is communicated with the large flue 2, a first branching pipe 7, a second branching pipe 8, a pressure gauge 9 and a large gate 11 of the flue are sequentially arranged on the large flue 2, the tail end of the first branching pipe 7 is connected to a coal-spraying mill 4, the second branching pipe 8 is connected to a preheater port connecting pipe 6, the tail end of the preheater port connecting pipe 6 is communicated with the chimney 13, an electric actuating mechanism 12 is arranged on the large gate 11 of the flue, the PLC system 10 is connected with the pressure gauge 9 and the electric actuating mechanism 11, and the tail end of the large flue 2 is communicated with the chimney 13.

And a preheater 5 is arranged at the junction of the second shunt tube 8 and the preheater port connecting tube 6.

The pressure gauge 9 transmits the detected pressure value of the large flue 2 to the PLC system 10, the PLC system 10 judges whether the detected pressure value is in a normal range or not according to the pressure value, if the detected pressure value is not in the normal range, a control signal is output to the electric actuator 12 to adjust the opening of the large flue gate 11 until the detected value of the pressure gauge 9 is in the normal range, and the adjustment of the opening of the large flue gate 11 is stopped.

During the use process, the flue gas generated by the hot blast stove 1 flows into the large flue 2, when the flue gas passes through the first branch pipe 7, part of the flue gas can pass through the first branch pipe 7 and is supplied to the coal injection mill 4 for use, the rest of the flue gas can pass through the large flue 2 and continuously flow forward, when the flue gas passes through the second branch pipe 8 and is supplied to the preheater 5 for use, after the preheating is finished, the flue gas passing through the preheater 5 can be conveyed into the chimney 13 through the preheater port connecting pipe 6 for discharging, after the flue gas passes through the second branch pipe 8, the rest of the flue gas in the large flue 2 can be continuously conveyed backwards, during the conveying process, the pressure gauge 9 can detect the pressure in the large flue 2, if the pressure value in the large flue 2 is in the range of-2 to 2kpa, the pressure value in the large flue 2 is at a normal value, the large flue gate is not required to be regulated, if the pressure value in the large flue 2 is lower than-2 kpa, at this time, the PLC system 10 controls the electric actuator 12 according to the information obtained by the pressure gauge 9 to adjust the opening of the large flue gate 11 to be smaller, so as to reduce the discharge amount of the flue gas conveyed into the chimney 13 through the large flue gate 3, and ensure that the flue gas conveyed to the coal-spraying mill 4 and the preheater 5 cannot influence the consumption and quality due to the large suction force generated by the chimney 13 until the pressure of the large flue 2 is normal, if the pressure value in the large flue 2 exceeds 2kpa, the pressure value in the large flue 2 is excessively large, at this time, the PLC system 10 controls the electric actuator 12 according to the information obtained by the pressure gauge 9 to adjust the opening of the large flue gate 11 to increase the discharge amount of the flue gas conveyed into the chimney 13 through the large flue gate 11 until the pressure of the large flue 2 is normal, so as to avoid the excessive flue gas in the large flue 2 from causing blockage, thereby realizing continuous and stable smooth discharge of the flue gas in the large flue.

The utility model is not limited to the specific embodiments described above. The utility model extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.

Claims

1. The utility model provides a big floodgate automatically regulated system of hot-blast furnace flue, its characterized in that, including hot-blast furnace (1), big flue (2), PLC system (10) and chimney (13), hot-blast furnace (1) are linked together with big flue (2), first shunt tubes (7), second shunt tubes (8), manometer (9) and big floodgate of flue (11) have set gradually on big flue (2), the end-to-end connection of first shunt tubes (7) is to coal injection mill (4), the end-to-end connection of second shunt tubes (8) is to preheater mouth connecting pipe (6), the exit end of preheater mouth connecting pipe (6) is linked together with chimney (13), be provided with electric actuator (12) on the big floodgate of flue (11), PLC system (10) are connected with manometer (9) and electric actuator (12), the end of big flue (2) is linked together with chimney (13).

2. The automatic large-gate regulating system for the flue of the hot blast stove according to claim 1, wherein a preheater (5) is arranged at the junction of the second bypass pipe (8) and the preheater port connecting pipe (6).