CN109321700B - Blast furnace body cooling wall damage detection and separation method - Google Patents
Blast furnace body cooling wall damage detection and separation method Download PDFInfo
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- CN109321700B CN109321700B CN201710637479.3A CN201710637479A CN109321700B CN 109321700 B CN109321700 B CN 109321700B CN 201710637479 A CN201710637479 A CN 201710637479A CN 109321700 B CN109321700 B CN 109321700B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
- C21B7/103—Detection of leakages of the cooling liquid
Abstract
The invention provides a method for detecting and separating the damage of a cooling wall of a blast furnace body, which relates to the treatment of the damage of on-line cooling water equipment of key equipment in a cooling area of a blast furnace body, wherein a damage early warning mechanism of the cooling equipment is adopted in the operation process of a cooling water system of the blast furnace, so that the difficulty of production operation is solved; after the cooling equipment is damaged, leakage of the cooling equipment can be quickly treated through tank liquid level change, branch pipe flow difference prediction, pipe switching and isolation, so that the damage of the cooling wall of the blast furnace body can be completely checked and quickly treated, and the damage of water leakage of the cooling equipment is eliminated. The invention reduces the energy consumption of the blast furnace and the loss of cooling water and prevents the water quality deterioration through forecasting, confirming and isolating rapid reaction and treatment, thereby solving the potential safety hazards of high temperature, high coal gas concentration, high labor intensity and the like of the field operation area.
Description
Technical Field
The invention relates to the technical field of blast furnace body cooling equipment, in particular to a blast furnace body cooling wall damage detection and separation method.
Background
The domestic blast furnace body cooling water pipe network generally adopts a series of water pipe connection mode to the end, also adopts the intermediate transition section mode, but this design mode is in the blast furnace in-service use, and blast furnace stave has early warning speed slow when damaged, and the inspection is confirmed the degree of difficulty and is big, the control effect is not obvious to cause the fluctuation of blast furnace production furnace condition and fuel consumption big.
The early warning speed is low, the head tank and the expansion pipe are already installed in the design process of the blast furnace, the leakage phenomenon of the cooling water of the blast furnace is mainly determined through the liquid level change of the head tank, and because the cooling water pipe of the blast furnace is dense and hemp and the flange leakage is common, the position of the cooling wall damaged by the liquid level change is very difficult to determine, and the rapid processing cannot be realized. The difficulty is confirmed in the inspection, when the blast furnace is designed, a coal gas detection valve is arranged on the cooling wall connecting pipe, when the liquid level of the blast furnace head tank changes, liquid level inspection is carried out on 200 water pipes, and the large operation environment difference processing caused by personnel investment is very difficult. The control effect is not obvious, when a blast furnace detects that a certain string of cooling wall cooling water pipes are damaged, only the water supply flow can be controlled for maintenance in the production process, the method causes that a large amount of cooling water leaks into the furnace to absorb a large amount of heat, fuel digestion is large, the cooling water in a cooling system can flow into the furnace through a damaged port, blast furnace gas can also flow into the cooling system when the gas-water interface pressure fluctuates, the heat consumption in the furnace is obviously increased due to the fact that the cooling equipment is damaged and leaks into the furnace, the hydrogen content in the furnace top gas is increased, and the soft water quantity digestion is large. The other method is to change the water supply to industrial water for cooling and control the water quantity, but the cooling wall forms pressure difference due to high fall height, most of the cooling water leaks into the furnace, if the water quantity is reduced, the upper cooling wall with small water quantity cannot be cooled and cannot be subjected to online treatment.
Disclosure of Invention
Technical problem to be solved
The invention provides a method for detecting and separating the damage of the cooling wall of the blast furnace body, aiming at overcoming the defects of low early warning speed, high difficulty in checking and confirming and unobvious control effect when the cooling wall of the blast furnace is damaged, realizing the separation operation from the early warning mechanism to the checking and confirming to the operation and treatment when the cooling equipment of the blast furnace is damaged, not leaving the hidden danger caused by the damaged cooling wall, and solving the potential safety hazards of high temperature, high gas concentration, high labor intensity and the like of a field operation area.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a blast furnace body cooling wall damage detection and separation method comprises the following steps:
s1, performing blast furnace body cooling water leakage early warning through the liquid level variation difference of the blast furnace head tank;
s2, forecasting branch pipe damage through a blast furnace area header or branch pipe flow difference;
s3, judging the damaged part of the cooling wall by switching the pipes between the cooling walls;
and S4, isolating the damaged cooling wall, switching valves to ensure the water supply cooling of the normal cooling wall, and independently cooling the damaged cooling wall by nitrogen.
Further, in the step S1, the change of the evaporation amount is removed by the cooling water level set by the head tank, and the abnormal water replenishing tendency is that the cooling water of the blast furnace body leaks, so that the blast furnace operator must check the cooling water of the blast furnace body.
Further, the upper limit of the cooling water liquid level set by the head tank is 1.8m, and the lower limit is 1.2 m.
Further, in the step S2, the cooling wall of the blast furnace body is formed by completely connecting all cast iron materials in a series manner, the cooling wall is connected in a manner of over-adjusting a part of 3-5 sections of headers, pressure flow detection is adopted for detection and early warning, the change of differential flow of water supply and drainage is forecasted, the phenomenon that cooling water of the headers or branch pipes leaks is forecasted, and operators are urged to check and confirm the cooling water pipes.
Further, the header is a copper stave header.
Further, in step S3, a dome valve is attached to the cooling wall pipe portion.
Further, the diameter of the hemisphere valve is 65 mm.
Furthermore, ball valves are arranged on the inner side and the outer side of the hemispherical valve, and the cooling wall of the damaged part is switched and confirmed.
Further, the diameter of the ball valve is 38 mm.
Furthermore, after the valve in the step S4 is switched, the hemisphere valve of 65mm of the damaged cooling wall water inlet and outlet pipe is closed, the 38mm ball valve at the inner side of 65mm of the damaged cooling wall is filled with nitrogen for cooling, and the 38mm ball valve at the outer side of 65mm is subjected to normal cooling water temporary water pipe connection and is merged into normal water system operation.
(III) advantageous effects
The invention has the beneficial effects that: a blast furnace body cooling wall breakage detection separation method, the blast furnace cooling water system adopts the breakage early warning mechanism of the cooling device in the operation process, solve the production operation difficult problem; after the cooling equipment is damaged, leakage cooling equipment can be quickly treated through tank liquid level change, branch pipe flow difference prediction, pipe switching and isolation, so that the detection and quick treatment of the damage of the cooling wall of the blast furnace body are perfected, and the damage of water leakage of the cooling equipment is eliminated; through forecasting, confirming and isolating rapid reaction and treatment, the energy consumption of the blast furnace and the loss of cooling water are reduced, the water quality deterioration is prevented, and the potential safety hazards of high temperature, high gas concentration, high labor intensity and the like of a field operation area are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is an exploded view of a cooling device valve arrangement;
in the figure, 1 is a cooling wall, 2 is a cooling wall, 3 is a cooling wall, 4 is a cooling wall, 5 is a cooling wall, 6 is a cooling wall pipe, 7 is a nitrogen gas discharge valve, 8 is a nitrogen gas inlet valve, 9 is a cooling water outlet pipe of the cooling wall 1, 10 is a cooling water inlet pipe of the cooling wall 2, 11 is a cooling water outlet pipe of the cooling wall 2, 12 is a cooling water inlet pipe of the cooling wall 3, 13 is a communication pipe of the cooling wall 1 and the cooling wall 3, 14 is a water outlet valve, 15 is a stop valve, 16 is a bypass valve, 17 is a bypass pipe, 18 is a bypass pipe, 19 is a bypass valve, 20 is a stop valve, and 21 is a water inlet valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
With reference to fig. 1, a method for detecting and separating the damage of a cooling wall of a blast furnace body comprises the following steps:
and S1, performing blast furnace body cooling water leakage early warning through the liquid level variation difference of the blast furnace head tank.
The change of evaporation capacity is removed through the cooling water liquid level that the head jar set for, and unusual moisturizing trend is that blast furnace body cooling water has the leakage phenomenon, and blast furnace operating personnel must carry out the investigation to blast furnace body cooling water, and the prerequisite of investigation accuracy must be the prerequisite that condenser tube does not have the outside leakage. The cooling water level set by the head tank may be set to an upper limit of 1.8m and a lower limit of 1.2 m.
And S2, forecasting branch pipe breakage through the flow difference of the blast furnace area header pipe or the branch pipe.
The cooling wall of the furnace body of the blast furnace is generally in a form of one-string bottom-reaching of all cast iron materials, is connected in a mode of over-adjustment of partial 3-5 sections of collecting pipes, is detected and early warned by pressure flow detection, forecasts the change of differential flow of water discharge, predicts the leakage phenomenon of cooling water of the collecting pipes or branch pipes, and urges operators to check and confirm the cooling water pipes. The header may be a copper stave header.
And S3, judging the damaged part of the cooling wall by switching the pipes between the cooling walls.
The cooling water pipes of the cooling wall of the furnace body are connected by as many as 10 strings, the height drop is 20-25m, and the damaged cooling wall part cannot be accurately confirmed by pressure inspection and liquid level inspection. A65 mm diameter half ball valve was attached to the cooling wall piping portion, and 38mm diameter ball valves were attached to both the inside and outside of the half ball valve, and the cooling wall at the damaged portion was confirmed by switching.
And S4, isolating the damaged cooling wall, switching valves to ensure the water supply cooling of the normal cooling wall, and independently cooling the damaged cooling wall by nitrogen.
And after the valve is switched, closing the 65mm hemispherical valve of the water inlet and outlet pipe of the damaged cooling wall, introducing nitrogen gas to cool the 38mm ball valve on the inner side of the 65mm damaged cooling wall, and connecting the 38mm ball valve on the outer side of the 65mm with a normal cooling water temporary water pipe to be merged into a normal water system for operation.
Referring to the exploded view of the valve arrangement of the cooling apparatus in fig. 2, five vertically adjacent staves are shown as 1, 2, 3, 4 and 5, and stave piping is shown as 6, and a nitrogen gas discharge valve 7 and a nitrogen gas inlet valve 8 are respectively installed on the stave piping. Reference numeral 9 denotes a cooling water outlet pipe of the stave 1, 10 denotes a cooling water inlet pipe of the stave 2, 11 denotes a cooling water outlet pipe of the stave 2, 12 denotes a cooling water inlet pipe of the stave 3, and 13 denotes a communication pipe between the staves 1 and 3. 14 is a water outlet valve on a connecting pipe 13 of the cooling wall 1 and the cooling wall 3, 21 is a water inlet valve on the connecting pipe 13 of the cooling wall 1 and the cooling wall 3, 15 is a stop valve on a cooling water outlet pipe 9 of the cooling wall 1, 17 is a bypass pipeline of a cooling water inlet pipe 10 of the cooling wall 2, 16 is a bypass valve on the bypass pipeline 17, 18 is a bypass pipeline on a cooling water outlet pipe 11 of the cooling wall 2, 19 is a bypass valve on the bypass pipeline 18, and 20 is a stop valve on a cooling water inlet pipe 12 of the cooling wall 3.
The cooling wall of the blast furnace is divided into five sections, for example, the cooling wall 2 is broken, the breakage of the cooling wall 2 is confirmed through the switching of the valves, the communication pipe 13 of the cooling wall 1 and the cooling wall 3 is connected with the water outlet valve 14 and the water inlet valve 21, the cooling wall 1 and the cooling wall 3 are normally communicated with water, and the water leakage part is eliminated. For example, the stave 4 is broken, and the stave is controlled and processed such that the stave 4 is broken, the nitrogen gas discharge valve 7 and the nitrogen gas inlet valve 8 are connected to each other, and the stave is cooled from the nitrogen gas inlet to the nitrogen gas outlet, thereby maintaining the production and preventing the stave from being further deteriorated.
In summary, the present invention has the following features: (1) the complete process design of abnormal leakage of the blast furnace cooling water system in the operation process solves the problems of equipment maintenance and safe production operation. Because the cooling equipment is damaged due to stress and thermal abrasion, a large amount of cooling water enters the furnace to influence the smooth operation and fuel consumption of the blast furnace, and the accident of cooling the blast furnace is caused in serious cases, so that the damage early warning mechanism of the cooling equipment is improved, and the difficult problem of production operation is solved; (2) the method improves the rapid method for checking and treating the damage of the cooling wall of the blast furnace body. After the cooling equipment is damaged, the leaked cooling equipment can be quickly treated through tank liquid level change, branch pipe flow difference prediction and switching of the piping in an isolated manner, and the damage of water leakage of the cooling equipment is eliminated; (3) the production is oriented to intelligent automation and energy consumption reduction, and the energy consumption of the blast furnace and the cooling water loss are reduced and the water quality deterioration is prevented through forecasting, confirmation and isolation quick reaction and treatment.
The embodiment of the invention relates to the treatment of the on-line cooling water equipment damage of the key equipment in the cooling area of a blast furnace body, which can carry out early warning confirmation check and quick treatment on the damage of the cooling wall of each part in the production process of the blast furnace, thereby ensuring the use of the normal cooling wall, the stable condition of the blast furnace and the digestion of fuel and cooling water when the cooling equipment of the blast furnace is damaged, and solving the potential safety hazards of high temperature, high gas concentration, high labor intensity and the like of an on-site operation area.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A blast furnace body cooling wall damage detection and separation method is characterized by comprising the following steps:
s1, performing blast furnace body cooling water leakage early warning through the liquid level variation difference of the blast furnace head tank;
s2, forecasting branch pipe damage through a blast furnace area header or branch pipe flow difference;
s3, judging the damaged part of the cooling wall by switching the pipes between the cooling walls, wherein in the step S3, a hemisphere valve is arranged at the pipe part of the cooling wall, ball valves are arranged at the inner side and the outer side of the hemisphere valve, and the damaged part of the cooling wall is confirmed by switching;
s4, isolating the damaged cooling wall, switching valves to ensure the water supply cooling of the normal cooling wall, and performing nitrogen cooling on the damaged cooling wall,
and S2, connecting the cooling walls of the blast furnace body by adopting a mode that all cast iron materials are connected to the bottom in a series mode, adopting a mode that partial 3-5 sections of collecting pipes are excessively adjusted, adopting pressure flow detection to carry out detection and early warning, forecasting the change of flow of water supply difference, forecasting the leakage phenomenon of cooling water of the collecting pipes or the branch pipes, and supervising operators to carry out inspection and confirmation on the cooling water pipes.
2. The blast furnace body cooling wall damage detection and separation method according to claim 1, characterized in that: in the step S1, the change of the evaporation amount is removed by the cooling water level set by the head tank, and the abnormal water replenishing tendency is that the cooling water of the blast furnace body leaks, and the blast furnace operator must check the cooling water of the blast furnace body.
3. The blast furnace body cooling wall damage detection and separation method according to claim 2, characterized in that: the upper limit of the cooling water liquid level set by the head tank is 1.8m, and the lower limit is 1.2 m.
4. The blast furnace body cooling wall damage detection and separation method according to claim 1, characterized in that: the header is a copper stave header.
5. The blast furnace body cooling wall damage detection and separation method according to claim 1, characterized in that: the diameter of the hemisphere valve is 65 mm.
6. The blast furnace body cooling wall damage detection and separation method according to claim 5, characterized in that: the diameter of the ball valve is 38 mm.
7. The blast furnace body cooling wall damage detection and separation method according to claim 6, characterized in that: and after the valve in the step S4 is switched, closing the 65mm hemispherical valve of the water inlet and outlet pipe of the damaged cooling wall, introducing nitrogen gas for cooling through the 65mm inner 38mm ball valve of the damaged cooling wall, and connecting the 65mm outer 38mm ball valve with a normal cooling water temporary water pipe to be merged into a normal water system for operation.
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| CN114002222A (en) * | 2020-07-28 | 2022-02-01 | 宝山钢铁股份有限公司 | Intelligent flaw detection device, system and method for in-service pipeline |
| CN114317942A (en) * | 2020-09-28 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Method for judging and processing water leakage in hot galvanizing horizontal furnace |
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