CN110628977B - Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline - Google Patents
Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline Download PDFInfo
- Publication number
- CN110628977B CN110628977B CN201811225306.1A CN201811225306A CN110628977B CN 110628977 B CN110628977 B CN 110628977B CN 201811225306 A CN201811225306 A CN 201811225306A CN 110628977 B CN110628977 B CN 110628977B
- Authority
- CN
- China
- Prior art keywords
- valve
- hot
- backflow
- air
- hot air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C21B9/10—Other details, e.g. blast mains
- C21B9/12—Hot-blast valves or slides for blast furnaces
Abstract
The invention relates to an optimization method for solving the problem of insufficient backflow and air draft of a hot air pipeline of a blast furnace, which comprises the following optimization steps: firstly, confirming that a backflow valve is opened; secondly, selecting a hot blast stove with the highest vault temperature and capable of being normally opened by a hot blast valve and a flue valve to perform hot blast pipeline air draft operation; thirdly, effectively separating the hot air branch pipe from the interior of the blast furnace to reduce the heat in the furnace from flowing into the hot air pipeline through the hot air branch pipe, selecting a hot air furnace with the highest vault temperature and the normal opening of a hot air valve and a flue valve to perform hot air pipeline air draft operation according to the second step, and confirming the air draft effect after the operation; and fourthly, regulating and controlling the air suction amount through the opening and closing of the flue valve. The backflow air draft control device is suitable for field production conditions that backflow draft of the hot air pipeline is insufficient, and is also suitable for backflow draft operation of the backflow pipeline and the backflow valve which cannot perform backflow draft.
Description
Technical Field
The invention belongs to the technical field of blast furnace hot blast stove processes, and relates to an optimization method for solving the problem of insufficient backflow and air draft of a blast furnace hot blast pipeline.
Background
During the process of replacing the blast furnace hot blast valve, the hot blast branch pipes at two ends of the hot blast valve, namely the hot blast branch pipes are close to the hot blast main body side, and the hot blast branch pipes are close to the hot blast main pipe side, the negative pressure condition of air draft can be maintained, the operations such as grinding of the refractory materials at the end ports of the branch pipes, processing of sealing gaskets and the like can be carried out, the hot blast branch pipes are close to the suction force of the hot blast main body side and are subjected to air draft by the hot blast main body, the flue and the chimney, and the hot blast branch pipes are close to the suction force of the hot blast main pipe side and are subjected to air draft by the hot blast main pipe and the backflow valve. However, in actual production, due to reasons such as insufficient height of the backflow pipe, the negative pressure condition of the hot air branch pipe cannot be achieved by air draft of the hot air main pipe side, hot air flow in the pipeline continuously emits outwards, overhauling operation cannot be carried out, even the overhauling period is greatly delayed, and the difficulty of timely recovery production of the blast furnace and increase of the normal production level of the blast furnace are affected.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an optimization method for solving the problem of insufficient backflow and air draft of a hot air pipeline of a blast furnace, which is suitable for the field production condition that the backflow and air draft of the hot air pipeline is insufficient, is also suitable for the special production condition that the backflow and air draft operation of the backflow pipeline and a backflow valve cannot be carried out, and the negative pressure condition of a hot air main pipe area needs to be maintained, has the characteristics of low cost, conciseness, high efficiency and the like, and can avoid the influence on the overhaul period of the blast furnace due to the insufficient suction of the hot air pipeline.
The technical scheme adopted by the invention for solving the technical problems is as follows: an optimization method for solving the problem of insufficient backflow and air draft of a hot air pipeline of a blast furnace comprises the following optimization steps:
firstly, confirming that a backflow valve is opened, if a hot air branch pipe is not effectively separated from a blast furnace, informing an air port platform area and furnace top operating personnel to evacuate before the backflow valve is opened, and pulling a warning line to prevent gas poisoning;
secondly, selecting a hot blast stove with the highest vault temperature and capable of being normally opened by a hot blast valve and a flue valve to perform hot blast pipeline air draft operation; after the hot blast valve and the flue valve are opened, heat flow in the hot blast main pipe is subjected to air draft in the sequence of firstly heating the hot blast main pipe by the hot blast main pipe and then heating the hot blast main body by the hot blast branch pipe, then the flue valve is carried out again, then the flue is carried out finally by the chimney, and the air draft effect after operation is confirmed;
thirdly, if the backflow pipeline and the backflow valve cannot perform backflow air draft operation and a special production condition that a negative pressure condition is required to be maintained in a hot air main pipe area is required, firstly, the hot air branch pipe and the blast furnace are effectively separated, the heat in the furnace is reduced from flowing into the hot air pipeline through the hot air branch pipe, then according to the second step, a hot air furnace with the highest vault temperature is selected, meanwhile, the hot air valve and the flue valve can be normally opened to perform hot air pipeline air draft operation, and the air draft effect after the operation is confirmed;
fourthly, regulating and controlling the air suction quantity through the opening and closing of a flue valve; in the operation process, the leakage port of the hot air branch pipe forms a negative pressure state, normal maintenance operation can be carried out, and the ventilation quantity is adjusted and controlled by opening and closing the flue valve.
In the second step, because a large amount of coke and coal gas are filled in the blast furnace, after an air draft channel is formed, the concentration of the coal gas at the positions of the front of the blast furnace, the top of the blast furnace, a hot air branch pipe leakage port and the like must be monitored to prevent coal gas poisoning accidents.
The invention has the positive effects that: the process technology analysis is carried out through the air draft of the chimney and the negative pressure state, the operation process of the pipeline and the valve of the hot blast stove is optimized, and the field production requirement is met; the backflow valve can be popularized to be applied to large, medium and small blast furnace hot blast furnaces of the same industry when the backflow air draft of the hot blast pipe is insufficient when the hot blast pipe of the hot blast valve is replaced, and the backflow valve is also suitable for the maintenance condition that the backflow pipe and the backflow valve can not perform backflow air draft operation, but the negative pressure condition is maintained in the hot blast main pipe area. The method has the advantages of no need of increasing investment of other equipment, low cost, simplicity, high efficiency and the like, and can avoid the influence on the maintenance period of the blast furnace due to insufficient draft of the hot air pipeline.
Drawings
FIG. 1 is a schematic structural diagram of the embodiment.
1-blast furnace, 2-hot blast furnace 1#, 3-hot blast furnace 2#, 4-chimney, 5-hot blast valve, 6-flue valve, 7-hot blast branch pipe, 8-hot blast main pipe, 9-reflux valve and 10-flue.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
An optimization method for solving the problem of insufficient backflow and air draft of a hot air pipeline of a blast furnace comprises the following optimization steps:
firstly, confirming that a backflow valve is opened, if a hot air branch pipe is not effectively separated from a blast furnace, informing an air port platform area and furnace top operating personnel to evacuate before the backflow valve is opened, and pulling a warning line to prevent gas poisoning;
secondly, selecting a hot blast stove with the highest vault temperature and capable of being normally opened by a hot blast valve and a flue valve to perform hot blast pipeline air draft operation; after the hot blast valve and the flue valve are opened, heat flow in the hot blast main pipe is subjected to air draft in the sequence of firstly heating the hot blast main pipe by the hot blast main pipe and then heating the hot blast main body by the hot blast branch pipe, then the flue valve is carried out again, then the flue is carried out finally by the chimney, and the air draft effect after operation is confirmed;
thirdly, if the backflow pipeline and the backflow valve cannot perform backflow air draft operation and a special production condition that a negative pressure condition is required to be maintained in a hot air main pipe area is required, firstly, the hot air branch pipe and the blast furnace are effectively separated, the heat in the furnace is reduced from flowing into the hot air pipeline through the hot air branch pipe, then according to the second step, a hot air furnace with the highest vault temperature is selected, meanwhile, the hot air valve and the flue valve can be normally opened to perform hot air pipeline air draft operation, and the air draft effect after the operation is confirmed;
fourthly, regulating and controlling the air suction quantity through the opening and closing of a flue valve; in the operation process, the leakage port of the hot air branch pipe forms a negative pressure state, normal maintenance operation can be carried out, and the ventilation quantity is adjusted and controlled by opening and closing the flue valve.
In the second step, because a large amount of coke and coal gas are filled in the blast furnace, after an air draft channel is formed, the concentration of the coal gas at the positions of the front of the blast furnace, the top of the blast furnace, a hot air branch pipe leakage port and the like must be monitored to prevent coal gas poisoning accidents.
Example 1
Referring to fig. 1, the specific optimization steps are:
in a first step, it is confirmed that the reflux valve 9 is opened. If the hot blast branch pipe 7 is not effectively separated from the interior of the blast furnace 1, the backflow valve 9 is opened before informing the tuyere platform area and the furnace top operating personnel to evacuate, and a warning line is pulled up to prevent gas poisoning. The time for replacing the hot blast valve 5 is usually longer, and no matter from the perspective of restoring the production of the subsequent blast furnace or overhauling safety, effective separation between the hot blast branch pipe 7 and the blast furnace 1 is recommended.
And secondly, selecting a hot blast stove with the highest vault temperature and capable of being normally opened by a hot blast valve 5 and a flue valve 6 to perform hot blast pipeline air draft operation. After the hot blast valve 5 and the flue valve 6 are opened, hot air in the hot blast main pipe 8 flows through the following processes to perform air draft: the hot air main pipe 8, the hot air valve 5, the hot air branch pipe 7, the hot air furnace 1# (2), the flue valve 6, the flue 10 and the chimney 4, and the air draft effect after operation is confirmed. If the air draft operation time of the hot blast stove 2 is long, and the vault temperature is reduced to the control target temperature, the other hot blast stove 2# (3) with the condition can be replaced for air draft operation.
And thirdly, if the backflow pipeline and the backflow valve 9 cannot perform backflow air draft operation, and the special production condition of maintaining the negative pressure condition in the area of the hot air main pipe 8 needs to be maintained, firstly, the hot air branch pipe 7 and the blast furnace 1 are effectively separated, the heat in the furnace is reduced from flowing into the hot air main pipe 8 through the hot air branch pipe 7, then, according to the second step, the hot air furnace 2# (3) with the highest vault temperature and the normally-opened hot air valve 5 and the flue valve 6 is selected to perform hot air pipeline air draft operation, and the air draft effect after the operation is confirmed.
And fourthly, adjusting and controlling the air draft through the opening and closing of the flue valve 6. In the operation process, the leakage port of the hot air branch pipe 7 is in a negative pressure state, normal operation can be carried out, and the air draft adjustment and control are carried out through the opening and closing of the flue valve 6.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. An optimization method for solving the problem of insufficient backflow and air draft of a blast furnace hot air pipeline is characterized by comprising the following optimization steps:
firstly, confirming that a backflow valve is opened, if a hot air branch pipe is not effectively separated from a blast furnace, informing an air port platform area and furnace top operating personnel to evacuate before the backflow valve is opened, and pulling a warning line to prevent gas poisoning;
secondly, selecting a hot blast stove with the highest vault temperature and capable of being normally opened by a hot blast valve and a flue valve to perform hot blast pipeline air draft operation; after the hot blast valve and the flue valve are opened, heat flow in the hot blast main pipe is subjected to air draft in the sequence of firstly heating the hot blast main pipe by the hot blast main pipe and then heating the hot blast main body by the hot blast branch pipe, then the flue valve is carried out again, then the flue is carried out finally by the chimney, and the air draft effect after operation is confirmed;
thirdly, if the backflow pipeline and the backflow valve cannot perform backflow air draft operation and a special production condition that a negative pressure condition is required to be maintained in a hot air main pipe area is required, firstly, the hot air branch pipe and the blast furnace are effectively separated, the heat in the furnace is reduced from flowing into the hot air pipeline through the hot air branch pipe, then according to the second step, a hot air furnace with the highest vault temperature is selected, meanwhile, the hot air valve and the flue valve can be normally opened to perform hot air pipeline air draft operation, and the air draft effect after the operation is confirmed;
fourthly, regulating and controlling the air suction quantity through the opening and closing of a flue valve; in the operation process, the leakage port of the hot air branch pipe forms a negative pressure state, normal maintenance operation can be carried out, and the ventilation quantity is adjusted and controlled by opening and closing the flue valve.
2. The optimization method for solving the problem of insufficient air draft of the hot blast pipeline backflow of the blast furnace as claimed in claim 1, is characterized in that: in the second step, because a large amount of coke and coal gas are filled in the blast furnace, after an air draft channel is formed, the concentration of the coal gas at the positions of the front of the blast furnace, the top of the blast furnace, a hot air branch pipe leakage port and the like must be monitored to prevent coal gas poisoning accidents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811225306.1A CN110628977B (en) | 2018-10-20 | 2018-10-20 | Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811225306.1A CN110628977B (en) | 2018-10-20 | 2018-10-20 | Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110628977A CN110628977A (en) | 2019-12-31 |
| CN110628977B true CN110628977B (en) | 2021-08-31 |
Family
ID=68968812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811225306.1A Active CN110628977B (en) | 2018-10-20 | 2018-10-20 | Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110628977B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5722965B2 (en) * | 1980-01-30 | 1982-05-15 | ||
| CN101899545A (en) * | 2009-05-27 | 2010-12-01 | 中冶成工上海五冶建设有限公司 | On-line changing method of hot blast main duct of blast furnace |
| CN105238901A (en) * | 2015-09-30 | 2016-01-13 | 北京首钢国际工程技术有限公司 | Multipurpose hot blast stove high-temperature preheating system |
| CN207646238U (en) * | 2017-10-31 | 2018-07-24 | 马鞍山钢铁股份有限公司 | A kind of hot-blast stove air supply line temperature control system |
| CN211170733U (en) * | 2019-10-29 | 2020-08-04 | 张家港宏昌钢板有限公司 | Negative pressure device for overhauling blast furnace hot blast stove |
-
2018
- 2018-10-20 CN CN201811225306.1A patent/CN110628977B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5722965B2 (en) * | 1980-01-30 | 1982-05-15 | ||
| CN101899545A (en) * | 2009-05-27 | 2010-12-01 | 中冶成工上海五冶建设有限公司 | On-line changing method of hot blast main duct of blast furnace |
| CN105238901A (en) * | 2015-09-30 | 2016-01-13 | 北京首钢国际工程技术有限公司 | Multipurpose hot blast stove high-temperature preheating system |
| CN207646238U (en) * | 2017-10-31 | 2018-07-24 | 马鞍山钢铁股份有限公司 | A kind of hot-blast stove air supply line temperature control system |
| CN211170733U (en) * | 2019-10-29 | 2020-08-04 | 张家港宏昌钢板有限公司 | Negative pressure device for overhauling blast furnace hot blast stove |
Non-Patent Citations (1)
| Title |
|---|
| 韶钢7号高炉热风支管波纹补偿器和热风阀更换施工技术;徐广春 等;《南方金属》;20150630(第204期);第8、10-11页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110628977A (en) | 2019-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105916600B (en) | The online pigging and spallation of coking outlet of still | |
| KR102037032B1 (en) | gas treatment for the prevention of pollution from top bleeder valves of blast furnace plant | |
| CN110643771A (en) | Method for efficiently driving coal gas of blast furnace hot blast stove coal gas system | |
| CN110628977B (en) | Optimization method for solving problem of insufficient backflow and air draft of blast furnace hot air pipeline | |
| CN100491548C (en) | Method of controlling temperature of high-temperature ring annealing furnace | |
| CN210736800U (en) | Blast furnace air supply system | |
| CN209652352U (en) | A kind of blast furnace crucibe air gap and lining wear judge equipment | |
| CN104006658B (en) | The method for repairing and mending of metallurgical furnace exhaust fume collecting hood top interior wall | |
| CN105420435A (en) | Automatic blast furnace air adjusting system and air adjusting method for metallurgic industry | |
| CN206799670U (en) | A kind of converter gas exhaust system | |
| CN101381785A (en) | Water control method after blast furnace cooling wall breakage | |
| CN211497515U (en) | Pressure balance type adsorbent circulation control device of S Zorb device | |
| CN108529668B (en) | Low-temperature chlorination furnace | |
| CN203426427U (en) | Device for treating situation that vanadium-titanium melted iron adheres to the tank | |
| CN213012940U (en) | Blast furnace hot blast main pipe refractory lining rapid cooling structure | |
| CN206802759U (en) | One kind smelts gas input cut-out protector | |
| CN207050487U (en) | A kind of tube furnace entrance coal gas fast cut valve protection device | |
| CN205782823U (en) | Gas fired-boiler automatic nitrogen-charging protection system | |
| CN205398664U (en) | Hot -blast furnace gas pipeline sweeps device | |
| CN104405912A (en) | Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process | |
| CN204403415U (en) | The hard sealed flat gate valve of Incoloy825 Alloy Anti sour nature gas high pressure | |
| CN112524962B (en) | Yellow phosphorus electric furnace tail gas recovery and purification process | |
| CN105586461A (en) | Purging device and purging method for gas pipeline of hot blast stove | |
| CN219824254U (en) | Blast furnace damping down gas recovery device | |
| CN107893137A (en) | A kind of blast furnace wind turning disconnection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |