CN113005251A - Energy-saving environment-friendly combustion fan system of large-scale blast furnace hot blast stove - Google Patents
Energy-saving environment-friendly combustion fan system of large-scale blast furnace hot blast stove Download PDFInfo
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- CN113005251A CN113005251A CN202110196590.XA CN202110196590A CN113005251A CN 113005251 A CN113005251 A CN 113005251A CN 202110196590 A CN202110196590 A CN 202110196590A CN 113005251 A CN113005251 A CN 113005251A
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- air supply
- combustion fan
- pressure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses an energy-saving and environment-friendly combustion fan system of a large blast furnace hot blast stove, which comprises a pressure sensor and a control system, wherein the combustion fan system comprises a plurality of combustion fan air supply units connected in parallel on an air supply main pipe, each combustion fan air supply unit comprises an air blower, a silencer arranged at an air inlet of the air blower, an air supply branch pipe arranged between the air blower and the air supply main pipe and a check valve arranged on the air supply branch pipe; and a blow-off valve is arranged on the air supply main pipe. The energy-saving and environment-friendly combustion fan system of the hot blast stove saves electric energy for blast, reduces equipment load, stabilizes process parameters, improves site safety environment, reduces maintenance operation times, provides reliable conditions for stable and smooth running of a blast furnace, and reduces ton iron cost.
Description
Technical Field
The invention relates to hot blast stove main body equipment, in particular to a combustion fan system for a large-scale blast furnace hot blast stove.
Background
With the development of high blast temperature in blast furnace ironmaking, hot blast stoves gradually move to the steps of energy saving, high efficiency and long service life, which puts higher requirements on the burning of the hot blast stoves. The combustion fan is particularly important as a device for providing constant-pressure and variable-quantity combustion-supporting cold air for the hot blast stove. Air is sucked by the silencer and is blown into a pipe network by a combustion fan after the air door is regulated, a bleeding valve is arranged on the pipe network to diffuse redundant air so as to prevent the pipeline from being pressed and damaged when the hot blast stove is completely stopped burning, and the silencer is arranged behind the bleeding valve to reduce the diffusing noise.
During normal burning, combustion-supporting cold air wind pressure passes through the adjustment of electric head traction air door regulation aperture according to the hot-blast furnace demand, nevertheless during the trade stove, because the burning of the stove of going ahead of burning stops burning and the reburning of the stove of going behind the air supply, the amount of wind demand is undulant big, and the wind pressure is unstable, and the regulation lag of air door, it is accurate fast inadequately, can't satisfy the hot-blast furnace and burn the stove demand. The following problems often exist:
1. the rated fan wastes electric energy after long-term excess operation;
2. when the air door is not closed timely before the hot blast stove burns and the stove stops burning, the air quantity is not reduced obviously, the pipe network is subjected to pressure building, the air flow of the stove after the stove burning is increased, the energy conservation and the consumption reduction are not facilitated, the vault burner of the hot blast stove is vibrated, the refractory material is damaged, and the high efficiency and the long service life of the hot blast stove are not facilitated;
3. when the air door is not opened timely enough when the air supply of the hot blast stove is restarted before air supply of the hot blast stove, the air quantity is small, ignition and combustion of the hot blast stove are not facilitated, potential safety hazards exist, along with the continuous opening of the air door, the adjustment is insensitive when the opening degree exceeds 70%, and the air quantity fluctuation is large;
4. the air door, the check valve and other equipment act repeatedly, the pressure fluctuation of the pipe network is large, the equipment is easy to damage, and the long-term stable operation of the system is not facilitated;
5. the instantaneous air quantity demand is fluctuated greatly when the furnace is changed and switched, the compressed air is easy to generate high-pitch noise, although the silencer is used for silencing, the requirement of safety ring can not be met, and occupational hazards are caused to staff.
At present, the motors of combustion-supporting fans of hot blast stoves at home and abroad adopt rated motors, the existing problems are not solved, and the motors can only be adjusted by air doors and adjusting valves or frequency converters are additionally arranged at the power supply of the motors, but the problems are not favorable for timely adjustment of air quantity or long-life and stable operation of the combustion-supporting fans, and the problems are not completely solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an energy-saving and environment-friendly combustion fan system of a large-scale blast furnace hot blast stove.
In order to achieve the purpose, the invention adopts the technical scheme that:
an energy-saving and environment-friendly combustion fan system of a large blast furnace hot blast stove comprises a pressure sensor and a control system, wherein the combustion fan system comprises a plurality of combustion fan air supply units connected in parallel on an air supply main pipe, and each combustion fan air supply unit comprises an air blower, a silencer arranged at an air inlet of the air blower, an air supply branch pipe arranged between the air blower and the air supply main pipe and a check valve arranged on the air supply branch pipe; and a blow-off valve is arranged on the air supply main pipe.
Furthermore, the combustion fan system comprises two combustion fan air supply units which are connected in parallel on the air supply main pipe; the working mode is two common use and synchronous adjustment.
Furthermore, the air blower adopts a variable frequency motor, and the frequency and the voltage of the variable frequency motor are adjusted by a control system according to the pipeline pressure of the air supply main pipe behind the air blower. The air blower is replaced by an energy-saving, environment-friendly and sensitive variable frequency motor from a traditional rated motor, so that the output power of the motor is changed to adapt to different air volume requirements.
Further, the check valve is an electric check valve controlled by a control system. The original mechanical check valve is changed into an electric check valve, and a strict interlocking program is designed on a control system, so that the electric check valve keeps partial opening after the air blower is shut down, thereby ensuring that no pressure is held between the air blower and the check valve and protecting the air blower and a pipe network.
Furthermore, the blow-off valve is closed frequently during air supply, combustion air blow-off is reduced, the utilization rate of combustion air is improved, when the hot blast stove stops burning all the time abnormally, the control system automatically sends out an instruction, the blow-off valve opens and blows off the pressure of the pipe network, the air blower and other equipment are protected, the blow-off valve is automatically closed when the hot blast stove burns again and the pressure in the pipe network is normal, and normal production is recovered.
Furthermore, the tail end of the air supply main pipe is provided with a safety valve, and when the air supply pressure reaches the blow-open pressure of the safety valve, the safety valve is opened to release the pressure. The pressure in the pipe network exceeds the design pressure of the pipe network under the abnormal condition, the pipe network is prevented from being damaged, production safety accidents are avoided, the safety of the pipe network is guaranteed, and the shutdown time of the main line equipment is reduced. When the pressure in the air supply main pipe exceeds the set pressure and does not reach the opening pressure of the safety valve, an alarm is given and the control system controls the opening of the relief valve to remind nearby operators to evacuate from the area, so that the intrinsic safety of equipment is realized, and the environmental safety is guaranteed.
Furthermore, the periphery of the safety valve is provided with a safety valve separated by a fence to open a pressure relief area, so that the gas is prevented from hurting people and other equipment.
The invention has the beneficial effects that:
1. the variable-frequency and variable-voltage regulation of the power of the variable-frequency motor can adapt to the actual production requirement, the stability is improved, and the energy consumption is reduced; 2. the output power is rapidly, continuously and sensitively adjusted through the voltage or frequency of the variable frequency motor, the air quantity requirement of the hot blast stove is adapted, the vibration and other equipment action frequency caused by the instantaneous change of the air quantity of a pipe network are reduced, a stable working environment is provided for the combustion, refractory materials and equipment of the hot blast stove, and the stability of the system is guaranteed; 3. the safety valve and the relief valve are protected in a double mode, so that the safety of the blower and other equipment under abnormal conditions is guaranteed; 4. the continuous power change of the variable frequency motor is not easy to cause the rapid change of the air quantity and the air pressure, the working noise of equipment is reduced, and the comfort of the field environment is improved; 5. and a check valve control mode is improved, and the air blower and a pipe network are protected under abnormal conditions. In a word, the energy-saving and environment-friendly combustion-supporting fan system for the hot blast stove saves electric energy for blast, reduces equipment load, stabilizes process parameters, improves site safety environment, reduces maintenance operation times, provides reliable conditions for stable and smooth running of a blast furnace, and reduces ton iron cost.
Drawings
FIG. 1 is a system schematic of an embodiment of the invention;
number designation in the figures: 1-thermocouple, 2-pressure sensor, 3-bleeding valve, 4-blower, 5-silencer, 6-electric check valve, 7-safety valve, 8-main air supply pipe, 9-branch air supply pipe.
Detailed Description
The invention is further described in detail with reference to the following embodiments, and as shown in fig. 1, the energy-saving and environment-friendly combustion fan system of the large-scale blast furnace hot blast stove comprises a pressure sensor 2 and a control system, and comprises two combustion fan air supply units which are connected in parallel with an air supply main pipe 8, wherein each combustion fan air supply unit comprises an air blower 4, a silencer 5 arranged at an air inlet of the air blower 4, an air supply branch pipe 9 arranged between the air blower 4 and the air supply main pipe 8, and an electric check valve 6 arranged on the air supply branch pipe 9; and a blow-off valve 3 is arranged on the air supply main pipe 8. The air blower 4 adopts a variable frequency motor, and the frequency and the voltage of the variable frequency motor are adjusted by a control system according to the pipeline pressure of the air supply main pipe 8 behind the air blower 4. The electric check valve 6 is controlled by a control system, and the electric check valve 6 keeps partial opening after the blower 4 is stopped. The bleeding valve 3 is closed when air supply is performed, when the hot blast stove stops burning abnormally, the control system automatically controls the bleeding valve 3 to quickly open 15% of pressure of a bleeding pipe network, when the hot blast stove burns again and the pressure in the pipe network is normal, the pressure is less than 15KPa, and the bleeding valve 3 is automatically closed. The tail end of the air supply main pipe 8 is provided with a safety valve 7, so that the pressure in the pipe network is prevented from exceeding the design pressure of the pipe network by 20KPa under abnormal conditions; when the pressure in the air supply main pipe 8 exceeds the set pressure of 15KPa and does not reach the pressure of 18KPa for opening the safety valve 7, alarming is carried out, the control system controls the relief valve 3 to be opened, and the periphery of the safety valve 7 is provided with a safety valve 7 which is isolated by a fence to open a pressure relief area.
The above description is only for the purpose of illustrating the technical solutions of the present invention, and those skilled in the art can make simple modifications or equivalent substitutions on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides an energy-concerving and environment-protective combustion fan system of large-scale blast furnace hot-blast stove, includes pressure sensor and control system, its characterized in that: the combustion-supporting fan system comprises a plurality of combustion-supporting fan air supply units which are connected in parallel with an air supply main pipe, wherein each combustion-supporting fan air supply unit comprises an air blower, a silencer arranged at an air inlet of the air blower, an air supply branch pipe arranged between the air blower and the air supply main pipe and a check valve arranged on the air supply branch pipe; and a blow-off valve is arranged on the air supply main pipe.
2. The combustion fan system of claim 1, wherein: the combustion fan system comprises two combustion fan air supply units which are connected in parallel on the air supply main pipe.
3. Combustion fan system according to claim 1 or 2, characterized in that: the air blower adopts a variable frequency motor, and the frequency and the voltage of the variable frequency motor are adjusted by a control system according to the pressure of a pipeline of the rear air supply main pipe of the air blower.
4. The combustion fan system of claim 3, wherein: the check valve is an electric check valve controlled by a control system, and the electric check valve keeps partial opening after the blower is stopped.
5. The combustion fan system of claim 4, wherein: the bleeding valve is closed when air supply is performed, when the hot blast stove stops burning abnormally, the control system automatically controls the bleeding valve to open and bleed the pressure of the pipe network, the hot blast stove burns again, and the bleeding valve is automatically closed when the pressure in the pipe network is normal.
6. The combustion fan system of claim 5, wherein: the tail end of the air supply main pipe is provided with a safety valve, and the safety valve is opened to release pressure after the air supply pressure reaches the opening pressure of the safety valve; when the pressure in the air supply main pipe exceeds the set pressure and does not reach the opening pressure of the safety valve, an alarm is given and the control system controls the opening of the relief valve.
7. The combustion fan system of claim 6, wherein: the periphery of the safety valve is provided with a safety valve separated by a fence to open a pressure relief area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110196590.XA CN113005251A (en) | 2021-02-22 | 2021-02-22 | Energy-saving environment-friendly combustion fan system of large-scale blast furnace hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110196590.XA CN113005251A (en) | 2021-02-22 | 2021-02-22 | Energy-saving environment-friendly combustion fan system of large-scale blast furnace hot blast stove |
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| Publication Number | Publication Date |
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| CN113005251A true CN113005251A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110196590.XA Pending CN113005251A (en) | 2021-02-22 | 2021-02-22 | Energy-saving environment-friendly combustion fan system of large-scale blast furnace hot blast stove |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141964A (en) * | 2014-04-22 | 2014-11-12 | 上海金自天正信息技术有限公司 | Air supply system and method of industrial furnace |
| CN104805247A (en) * | 2015-05-18 | 2015-07-29 | 上海联达节能科技有限公司 | Energy-saving regulating and controlling method for combustion fan of blast furnace hot blast stove |
| CN205825412U (en) * | 2016-06-23 | 2016-12-21 | 三明市同硕机械制造有限公司 | A kind of coal-fired hot-blast stove |
| CN112361593A (en) * | 2020-11-02 | 2021-02-12 | 中钢设备有限公司 | Hot blast stove system |
-
2021
- 2021-02-22 CN CN202110196590.XA patent/CN113005251A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141964A (en) * | 2014-04-22 | 2014-11-12 | 上海金自天正信息技术有限公司 | Air supply system and method of industrial furnace |
| CN104805247A (en) * | 2015-05-18 | 2015-07-29 | 上海联达节能科技有限公司 | Energy-saving regulating and controlling method for combustion fan of blast furnace hot blast stove |
| CN205825412U (en) * | 2016-06-23 | 2016-12-21 | 三明市同硕机械制造有限公司 | A kind of coal-fired hot-blast stove |
| CN112361593A (en) * | 2020-11-02 | 2021-02-12 | 中钢设备有限公司 | Hot blast stove system |
Non-Patent Citations (1)
| Title |
|---|
| 项钟庸 等: "《高炉设计——炼铁工艺设计理论与实践》", 30 November 2007, 冶金工业出版社 * |
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Application publication date: 20210622 |