CN107130072B - Water cooling device for blast furnace airtight box - Google Patents
Water cooling device for blast furnace airtight box Download PDFInfo
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- CN107130072B CN107130072B CN201710460172.0A CN201710460172A CN107130072B CN 107130072 B CN107130072 B CN 107130072B CN 201710460172 A CN201710460172 A CN 201710460172A CN 107130072 B CN107130072 B CN 107130072B
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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
Abstract
A water cooling device of a blast furnace airtight box belongs to the technical field of water cooling of bell-less charging equipment on the top of a blast furnace. Comprises an airtight box, a water supply pipeline, a water return ring pipe, a water return communicating pipe, a gas-water separation tank and a water return pipeline; the water supply pipeline is connected with a water inlet of the airtight box, the water return ring pipe is connected with a water outlet of the airtight box, the water return ring pipe is connected with the gas-water separation tank through a water return communicating pipe, the water return ring pipe, the gas-water separation tank and external communicating ports of gas media at the upper water tank and the lower water tank of the airtight box are respectively communicated with each other through the gas communicating pipe, and the water return pipeline is connected with a water outlet of the gas-water separation tank. The device has the advantages of simple and compact structure, low power consumption, simple operation, operation and maintenance and high safety.
Description
Technical Field
The invention belongs to the technical field of water cooling of bell-less charging equipment on the top of a blast furnace, and particularly relates to a water cooling device of a blast furnace airtight box. Is suitable for furnace top pressure of 0-0.30MPa and cooling water amount of 8-30m 3 The water cooling device of the airtight box of the bell-less charging equipment at the top of the blast furnace with any volume per hour.
Background
The airtight box is a core component of bell-less top charging equipment and has the functions of driving and controlling the rotation and the tilting of the distribution chute around the center line of the blast furnace and accurately finishing different distribution movements of the blast furnace.
The airtight box is positioned in the area near the blast furnace top steel ring, and the area has high temperature (200-250 ℃) and dust. Usually, micro-positive pressure nitrogen sealing is adopted to reduce the influence of dust on mechanical transmission in the airtight box; the mode of water cooling of the airtight box is adopted to ensure that the interior of the airtight box is maintained at the normal working temperature of 30-40 ℃. The cooling water amount of the airtight box is 8-15m 3 The nitrogen flow rate is 100- 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The cooling water path in the airtight box structure is of a groove type structure, and is a non-airtight system, namely the cooling water path is communicated with blast furnace gas, sealing nitrogen and other spaces in the throat of the blast furnace, so that a water seal structure is arranged in a water cooling pipeline system behind a cooling water outlet of the airtight box, the overflow of the gas in the blast furnace is avoided, and great unpredictable potential safety hazards are brought.
The existing airtight box water cooling devices are roughly divided into two types. The first type: the open circuit mode of the water of the blast furnace clean ring. The common flow is that cooling water is returned by an airtight box and then collected to a water return ring pipe, and a water return pipe is led out from the water return ring pipe and finally returned to a drainage hopper through a U-shaped water seal. The biggest disadvantage of the process is that the U-shaped water seal must ensure a reliable enough height, otherwise the water seal is likely to be broken down when the pressure of the top gas or nitrogen fluctuates or suddenly rises in actual operation, and certainly, the water seal is also likely to be broken down when the blowby gas in the return pipe is blocked to form a gas plug surge. The situation is easier to occur on medium and small blast furnaces operated at high top pressure, and large blast furnaces are relatively good in view of the fact that the effective height of the blast furnace is high, the water seal height space is large, but the large blast furnace still breaks down occasionally in China. The process has the advantages of simple device process, low power consumption and low initial investment. The second type: a closed loop mode of clean circulating water of a blast furnace. The common flow is that cooling water is returned by an airtight box and then collected to a water return ring pipe, a water return pipe is led out from the water return ring pipe and returns to a water storage tank in front of a pump set, the pump set operates to extract water in the tank, and the water is supplied to an airtight box body after passing through a filter and a heat exchanger so as to form closed-loop cooling. The pump set, the filter and the heat exchanger are usually arranged on an upper platform of the furnace body. The biggest defects of the process are that the device is complex, the power consumption, the occupied area, the initial investment and the like are large, the area has gas leakage in the later period of the blast furnace campaign, and the area has potential safety hazards; the biggest advantage of the process is that the whole device is in a closed state, and the possibility of water seal breakdown of the airtight box is avoided.
Energy conservation, low consumption, simple and easy operation and maintenance and high safety are always the targets pursued by cooling devices. According to the advantages and disadvantages of a conventional open circuit and a conventional closed circuit, the water cooling device of the blast furnace airtight box is designed and developed, and the purposes of the cooling device are simple, energy saving and low consumption; the debugging operation and maintenance are safe, simple and feasible, and certain self-adaptive intelligence is achieved.
Disclosure of Invention
The invention aims to provide a blast furnace airtight box water cooling device, which solves the problem that the cooling flow is influenced by a pipeline air plug due to the flow structure and the water sealing mode of the original airtight box water cooling device. The automatic water seal device has the advantages that the free gravity flow of the upper water tank and the lower water tank of the airtight box body is realized, the gas-water separation in a backwater cooling pipeline is realized, the liquid level is monitored in real time, the intelligent interlocking control adjusting valve is adaptive to the change of the working condition of the blast furnace, the intelligent interlocking control cut-off valve is opened and closed to ensure effective water seal, and the breakdown is thoroughly avoided.
A blast furnace airtight box water cooling device comprises an airtight box 1, a water supply pipeline 2, a water return ring pipe 3, a water return communicating pipe 4, a gas communicating pipe 5, a gas-water separation tank 6 and a water return pipeline 7; the water supply pipeline 2 is connected with a water inlet of the airtight box 1, the water supply pipeline 2 supplies water for cooling the airtight box 1, the water return ring pipe 3 is connected with a water outlet of the airtight box 1, and cooling water after cooling the airtight box 1 returns to the water return ring pipe 3; the water return ring pipe 3 is connected with the gas-water separation tank 6 through a water return communicating pipe 4, and cooling water returning to the water return ring pipe 3 enters the gas-water separation tank 6 through the water return communicating pipe 4; the return water ring pipe 3, the gas-water separation tank 6 and the external communicating port of the gas medium at the upper and lower water channels of the airtight box 1 are respectively communicated with each other through a gas communicating pipe 5 to realize free gravity flow of cooling water, the return water pipeline 7 is connected with the water outlet of the gas-water separation tank 6, and the cooling water of the airtight box 1 is sequentially discharged after passing through the return water ring pipe 3, the return water communicating pipe 4, the gas-water separation tank 6 and the return water pipeline 7.
Be equipped with first ball valve 8, first pressure gauge 12, first flowmeter 9, first remote control governing valve 10 and second ball valve 11 on the water supply pipe 2 in proper order, the specific flow of water supply pipe 2 among the device is that cooling water supplies water to airtight case 1 water inlet after passing through first ball valve 8, first pressure gauge 12, second flowmeter 9, first remote control governing valve 10 and second ball valve 11 in proper order.
A liquid level meter 14 and a second pressure meter 13 are installed on the gas-water separation tank 6, the second pressure meter 13 is used for monitoring the pressure of gas at the middle upper part of the gas-water separation tank in real time, the liquid level meter 14 is used for monitoring the water level in the gas-water separation tank 6 in real time, and a high water level H, a normal water level N, a low water level L, an alarm low water level D and the like are set in the gas-water separation tank 6.
A third ball valve 15, a second remote control regulating valve 16, a remote control stop valve 17, a second flow meter 18 and a fourth ball valve 19 are sequentially arranged on the water return pipeline 7, the specific flow of the water return pipeline 7 in the device is that cooling water sequentially passes through the third ball valve 15, the second remote control regulating valve 16, the remote control stop valve 17, the second flow meter 18 and the fourth ball valve 19 and then is discharged outside, the remote control stop valve 17 is used for ensuring the minimum water seal liquid level height in the gas-water separation tank 6, and when the liquid level height is in contact with or lower than an alarm low water level D, the remote control stop valve 17 is controlled to be in a closed state quickly; when the liquid level reaches the normal water level N, the remote control cut-off valve 17 is controlled to be in a full open state quickly.
The first ball valve 8, the second ball valve 11, the third ball valve 15 and the fourth ball valve 19 are used for cutting off when the cooling device is overhauled.
The first pressure gauge 12 is used to monitor whether the incoming water pressure of the cooling water meets the cooling water pressure requirement of the cooling device.
The first remote control regulating valve 10 is used for intelligently regulating the cooling water supply flow of the cooling device, and the second remote control regulating valve 16 is used for intelligently regulating the cooling water return flow of the cooling device and the liquid level height in the gas-water separation tank 6.
The implementation principle of the invention is divided into three parts, firstly, a first flowmeter 9 on a water supply pipeline 2 controls a first remote control regulating valve 10 on the water supply pipeline 2 in an interlocking way, the cooling water quantity entering an airtight box 1 is regulated and controlled, the final opening degree of the first remote control regulating valve 10 is controlled by taking the flow of a feedback pipeline of the first flowmeter 9 as a criterion, and the cooling water quantity of water supply is equal to the manually set flow; and secondly, the remote control cut-off valve 17 on the water return pipeline 7 is only interlocked with the liquid level meter 14 on the gas-water separation tank 6 for controlling, and the liquid level height is monitored in real time. When the liquid level is in contact with or lower than the alarm low water level D, the remote control cut-off valve 17 is controlled to be in a closed state quickly; when the liquid level reaches the normal water level N, the remote control cut-off valve 17 is controlled to be in a full open state quickly. And thirdly, a liquid level meter 14 on the gas-water separation tank 6, a second pressure gauge 13, a first flow meter 9 on the water supply pipeline 2, a second flow meter 18 on the water return pipeline 7 and a remote control cut-off valve 17 jointly interlock and control a second remote control regulating valve 16 on the water return pipeline 7. When the cooling device is operated, the initial opening degree of the remote control regulating valve 16 on the water return pipeline 7 is integrally calculated and quickly initialized according to the feedback data of the second pressure gauge 13 and the liquid level gauge 14 on the gas-water separation tank 6 and the manually set flow value. After the initialization is finished, the opening degree of the second remote control regulating valve 16 on the water return pipeline 7 is finely adjusted in real time, and the value of the second flow meter 18 on the water return pipeline 7 is kept to be slightly larger than the value of the first flow meter 9 on the water supply pipeline 2 (the difference value is A). If the liquid level reaches the high water level H, adjusting and keeping the opening degree of a second remote control regulating valve 16 on the water return pipeline 7 increased by B degrees; when the liquid level height returns to the normal water level N, the opening degree of the second remote control regulating valve 16 on the water return pipeline 7 is initialized again, the opening degree of the second remote control regulating valve 16 is finely adjusted in real time after the initialization is finished, and the display numerical value of the second flow meter 18 on the water return pipeline 7 is kept to be slightly larger than the flow numerical value of the first flow meter 9 on the water supply pipeline 2 (the difference value is A). If the liquid level reaches the low water level L, adjusting and keeping the opening degree of a second remote control regulating valve 16 on the water return pipeline 7 to reduce by B degrees; and when the liquid level returns to the normal water level N, initializing the opening degree of the second remote control regulating valve 16 on the water return pipeline 7 again, finely adjusting the opening degree of the second remote control regulating valve 16 in real time after the initialization is finished, and keeping the numerical value of the second flowmeter 18 on the water return pipeline 7 to be slightly larger than the numerical value of the first flowmeter 9 on the water supply pipeline 2 (the difference is A). When the remote-control cut-off valve 17 is closed, the second remote-control regulating valve 16 on the water return pipeline 7 is not adjusted. When the remote-control cut-off valve 17 is fully opened, the process is repeated. The values of A and B are determined according to specific examples.
The invention has the following characteristics:
1. the water cooling device is open-circuit cooling;
2. the water supply pipeline 2 is provided with a first remote control regulating valve 10 and a first flowmeter 9;
3. the water return pipeline 7 is provided with a second remote control regulating valve 16, a remote control cut-off valve 17 and a second flowmeter 18;
4. the gas communicating pipe 5 respectively communicates the water returning ring pipe 3, the gas-water separation tank 6 and external communicating ports of gas media at the upper and lower water tanks of the airtight box 1;
5. the device is provided with a gas-water separation tank 6, a tank body is provided with a liquid level meter 14 for real-time monitoring and continuous detection, and liquid level monitoring points such as a high water level H, a normal water level N, a low water level L, an alarm low water level D and the like are arranged. The number and position of the monitored liquid levels can be adjusted by specific examples.
6. A first remote control regulating valve 10 on the water supply pipeline 2 is controlled by a first flow meter 9 on the water supply pipeline 2 in an interlocking way;
7. and a second remote control regulating valve 16 on the water return pipeline 7 is controlled by a liquid level meter 14, a second pressure meter 13, a first flow meter 9, a second flow meter 18 and a remote control cut-off valve 17 on the gas-water separation tank 6 in an interlocking manner.
8. When the device is operated, except for a high water level H, a low water level L and an alarm low water level D, the opening degree of the second remote control regulating valve 16 on the water return pipeline 7 is completed by two processes of initialization and real-time fine adjustment. And triggering the opening initialization of the second remote control regulating valve 16 at the normal liquid level height N, and after the initialization is finished, regulating in real time to enable the second flow meter 18 on the water return pipeline 7 to display a value slightly larger than the flow value (the difference is A) of the first flow meter 9 on the water supply pipeline 2.
9. When the device operates, at the high water level H or the low water level L, the opening degree of the second remote control regulating valve 16 on the water return pipeline 7 is increased or reduced by B degrees from the current opening degree.
10. The opening and closing of the remote control cut-off valve 17 on the water return pipeline 7 are controlled by the liquid level height monitored by the liquid level meter 14 in a linkage manner. When the device is operated, when the liquid level reaches the alarm low water level D, the remote control cut-off valve 17 is controlled to be in a closed state quickly; when the liquid level reaches the normal water level N, the remote control cut-off valve 17 is controlled to be in a full open state quickly.
The invention has the advantages that the gas-water separation tank, the gas communicating pipe, the remote control regulating valve, the flowmeter, the liquid level meter and the like are organically integrated to form a complete and intelligent airtight box water cooling device. The cooling water is separated from the gas by using the gas-water separation tank, so that the phenomenon of surge of an air plug of the original open-circuit device is avoided; the gas communicating pipe is utilized to realize the free gravity flow of the water tank under the airtight box, thereby avoiding the possibility of the over-fast flow of the water tank under the airtight box or the overflow of water in the water tank, and also avoiding the influence of the pressure fluctuation of gas or nitrogen in the furnace on the flow of cooling water in the water tank; the intelligent regulation and cut-off functions of the cooling device under various working conditions and changes of the blast furnace are realized by utilizing the liquid level meter, the pressure meter, the flow meter on the water supply pipeline and the flow meter on the water return pipeline and the remote control cut-off valve to control the remote control regulating valve of the water return pipeline in a linkage manner, so that the effective water seal liquid level in the gas-water separation tank is effectively and reliably ensured, and the breakdown is avoided; the device is an open-circuit cooling device, has simple and compact structure, small power consumption, simple operation and maintenance and high safety, and effectively avoids the problems of complex closed-circuit device, large power consumption, complex operation and maintenance, insufficient safety in the later period of the furnace service and the like.
Drawings
FIG. 1 is a structural diagram of a water cooling device of a blast furnace airtight box. Wherein, airtight box 1, water supply pipe 2, return water ring pipe 3, return water closed pipe 4, gas closed pipe 5, gas-water separation tank 6, return water pipeline 7, first ball valve 8, first flowmeter 9, first remote control governing valve 10, second ball valve 11, first pressure gauge 12, second pressure gauge 13, level gauge 14, third ball valve 15, second remote control governing valve 16, remote control trip valve 17, second flowmeter 18, fourth ball valve 19, high water level H, normal water level N, low water level L, warning low water level D.
Detailed Description
Example 1
A blast furnace airtight box water cooling device comprises an airtight box 1, a water supply pipeline 2, a water return ring pipe 3, a water return communicating pipe 4, a gas communicating pipe 5, a gas-water separation tank 6 and a water return pipeline 7; the water supply pipeline 2 is connected with a water inlet of the airtight box 1, the water supply pipeline 2 supplies water for cooling the airtight box 1, the water return ring pipe 3 is connected with a water outlet of the airtight box 1, and cooling water after cooling the airtight box 1 returns to the water return ring pipe 3; the water return ring pipe 3 is connected with the gas-water separation tank 6 through a water return communicating pipe 4, and cooling water returning to the water return ring pipe 3 enters the gas-water separation tank 6 through the water return communicating pipe 4; the return water ring pipe 3, the gas-water separation tank 6 and the external communicating port of the gas medium at the upper and lower water channels of the airtight box 1 are respectively communicated with each other through a gas communicating pipe 5 to realize free gravity flow of cooling water, the return water pipeline 7 is connected with the water outlet of the gas-water separation tank 6, and the cooling water of the airtight box 1 is sequentially discharged after passing through the return water ring pipe 3, the return water communicating pipe 4, the gas-water separation tank 6 and the return water pipeline 7.
Be equipped with first ball valve 8, first pressure gauge 12, first flowmeter 9, first remote control governing valve 10 and second ball valve 11 on the water supply pipe 2 in proper order, the specific flow of water supply pipe 2 among the device is that cooling water supplies water to airtight case 1 water inlet after passing through first ball valve 8, first pressure gauge 12, second flowmeter 9, first remote control governing valve 10 and second ball valve 11 in proper order.
A liquid level meter 14 and a second pressure meter 13 are installed on the gas-water separation tank 6, the second pressure meter 13 is used for monitoring the pressure of gas at the middle upper part of the gas-water separation tank in real time, the liquid level meter 14 is used for monitoring the water level in the gas-water separation tank 6 in real time, and a high water level H, a normal water level N, a low water level L, an alarm low water level D and the like are set in the gas-water separation tank 6.
A third ball valve 15, a second remote control regulating valve 16, a remote control stop valve 17, a second flow meter 18 and a fourth ball valve 19 are sequentially arranged on the water return pipeline 7, the specific flow of the water return pipeline 7 in the device is that cooling water sequentially passes through the third ball valve 15, the second remote control regulating valve 16, the remote control stop valve 17, the second flow meter 18 and the fourth ball valve 19 and then is discharged outside, the remote control stop valve 17 is used for ensuring the minimum water seal liquid level height in the gas-water separation tank 6, and when the liquid level height is in contact with or lower than an alarm low water level D, the remote control stop valve 17 is controlled to be in a closed state quickly; when the liquid level reaches the normal water level N, the remote control cut-off valve 17 is controlled to be in a full open state quickly.
The first ball valve 8, the second ball valve 11, the third ball valve 15 and the fourth ball valve 19 are used for cutting off when the cooling device is overhauled.
The first pressure gauge 12 is used to monitor whether the incoming water pressure of the cooling water meets the cooling water pressure requirement of the cooling device.
The first remote control regulating valve 10 is used for intelligently regulating the cooling water supply flow of the cooling device, and the second remote control regulating valve 16 is used for intelligently regulating the cooling water return flow of the cooling device and the liquid level height in the gas-water separation tank 6.
Claims (3)
1. A blast furnace airtight box water cooling device is characterized by comprising an airtight box (1), a water supply pipeline (2), a water return ring pipe (3), a water return communicating pipe (4), a gas communicating pipe (5), a gas-water separation tank (6) and a water return pipeline (7); the water supply pipeline (2) is connected with a water inlet of the airtight box (1), the water supply pipeline (2) supplies water for cooling the airtight box (1), the water return ring pipe (3) is connected with a water outlet of the airtight box (1), and cooling water after cooling the airtight box (1) returns to the water return ring pipe (3); the water return ring pipe (3) is connected with the gas-water separation tank (6) through a water return communicating pipe (4), and cooling water returning to the water return ring pipe (3) enters the gas-water separation tank (6) through the water return communicating pipe (4); the water return ring pipe (3) and the gas-water separation tank (6) are respectively communicated with an external communicating port of a gas medium at the upper water tank and the lower water tank of the airtight box (1) through a gas communicating pipe (5) to realize free gravity flow of cooling water, the water return pipe (7) is connected with a water outlet of the gas-water separation tank (6), and the cooling water of the airtight box (1) is discharged outside after sequentially passing through the water return ring pipe (3), the water return communicating pipe (4), the gas-water separation tank (6) and the water return pipe (7);
a first ball valve (8), a first pressure gauge (12), a first flowmeter (9), a first remote control regulating valve (10) and a second ball valve (11) are sequentially arranged on the water supply pipeline (2); cooling water sequentially passes through a first ball valve (8), a first pressure gauge (12), a first flowmeter (9), a first remote control regulating valve (10) and a second ball valve (11) and then is supplied to a water inlet of the airtight box (1);
a liquid level meter (14) and a second pressure meter (13) are arranged on the gas-water separation tank (6); the second pressure gauge (13) is used for monitoring the pressure of gas at the middle upper part of the gas-water separation tank in real time, the liquid level meter (14) is used for monitoring the water level in the gas-water separation tank (6) in real time, and a high water level H, a normal water level N, a low water level L and an alarm low water level D are set in the gas-water separation tank (6);
the water return pipeline (7) is sequentially provided with a third ball valve (15), a second remote control regulating valve (16), a remote control stop valve (17), a second flow meter (18) and a fourth ball valve (19), and cooling water is discharged outside after sequentially passing through the third ball valve (15), the second remote control regulating valve (16), the remote control stop valve (17), the second flow meter (18) and the fourth ball valve (19); the remote control cut-off valve (17) is used for ensuring the minimum water seal liquid level height in the gas-water separation tank (6), when the liquid level height is in contact with or lower than the alarm low water level D, the remote control cut-off valve (17) is in a closed state, and when the liquid level height is in contact with the normal water level N, the remote control cut-off valve (17) is controlled to be in a full open state.
2. The device according to claim 1, characterized in that the first ball valve (8), the second ball valve (11), the third ball valve (15) and the fourth ball valve (19) are used for cutting off the cooling device during maintenance.
3. The device according to claim 1, characterized in that the first remote control regulating valve (10) is used for intelligently regulating the flow of cooling water supply of the cooling device, and the second remote control regulating valve (16) is used for intelligently regulating the flow of cooling water return of the cooling device and the liquid level height in the gas-water separation tank (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710460172.0A CN107130072B (en) | 2017-06-17 | 2017-06-17 | Water cooling device for blast furnace airtight box |
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| CN201710460172.0A CN107130072B (en) | 2017-06-17 | 2017-06-17 | Water cooling device for blast furnace airtight box |
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| CN107130072B true CN107130072B (en) | 2022-09-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108441593A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | A method of according to closed circuit water system water level figure judge its whether accumulated gas |
| CN111504073B (en) * | 2020-04-29 | 2023-02-03 | 中钢集团西安重机有限公司 | Water cooling system for furnace top |
| CN115537485B (en) * | 2022-09-22 | 2023-11-14 | 北京首钢股份有限公司 | Method for reconstructing water seal of water-cooling airtight box water seal system |
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| CN2751029Y (en) * | 2004-12-13 | 2006-01-11 | 宝钢集团上海梅山有限公司 | Gas displacement device of gas tight box |
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