CN213778769U - On-line flushing device for preheater of hot blast stove - Google Patents

On-line flushing device for preheater of hot blast stove Download PDF

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Publication number
CN213778769U
CN213778769U CN202022432285.XU CN202022432285U CN213778769U CN 213778769 U CN213778769 U CN 213778769U CN 202022432285 U CN202022432285 U CN 202022432285U CN 213778769 U CN213778769 U CN 213778769U
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China
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water
pressure
preheater
blast furnace
pump
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CN202022432285.XU
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Inventor
罗大军
王周勇
章鹏程
岳留威
刘百祥
王经鑫
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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Abstract

The utility model discloses an online washing unit of hot-blast furnace pre-heater, including flowmeter, manometer, force (forcing) pump, suction pump, high-pressure squirt, water drum, blowoff hole, manual ball valve, gas safety valve, collector, inlet opening, connect with leather hose, transition nozzle stub, lower sealing flange, water inlet gate valve, upper sealing flange, silk head, blow off pipe, data line, computer unit. The utility model discloses when the hot-blast furnace preheater takes place to block up, adopt the mode of area pressure trompil, adopt computer control water yield water pressure, can utilize the water under high pressure to realize carrying out online washing and mediation to preheater jam position under the condition of blast furnace not blowing down, can ensure that the hot-blast furnace burns stove gas pressure and gas volume, ensures the use of blast furnace high-wind temperature.

Description

On-line flushing device for preheater of hot blast stove
Technical Field
The utility model belongs to the technical field of blast furnace ironmaking, a device that is used for hot-blast furnace pre-heater to wash on line is related to.
Background
With the increase of cost and environmental pressure, the use of high wind temperature becomes one of the very effective measures for reducing iron-making cost in iron-making technology. In the prior art, the means for increasing the blast furnace air temperature is summarized in three aspects: firstly, the vault temperature is increased; secondly, the difference between the vault temperature and the wind temperature is reduced; and thirdly, starting from the equipment angle, improving the quality of refractory materials and improving the equipment and the structure of the hot blast stove.
There are many methods for raising the temperature of the vault, but from the economical point of view, it is undoubtedly the most effective measure to adopt the flue gas waste heat recovery of the hot blast stove to preheat the combustion air and the coal gas. The waste heat recovery not only can improve the heat efficiency and reduce the process energy consumption of the blast furnace, but also can improve the temperature of combustion air and coal gas for burning the furnace by the recovered heat, increase the physical heat, improve the temperature of the vault and further improve the air temperature. At present, flue gas preheating and recycling technology is widely adopted on the hot blast stove, and a good using effect is achieved.
The existing heat exchanger for recovering the flue gas waste heat of the hot blast stove has the forms of a heat pipe type, a heat medium type, a metal plate type and the like, wherein the metal plate type is used as heat exchange equipment for directly exchanging heat between flue gas and air gas, has the advantages of simple structure, convenience in maintenance, less air leakage and the like, and is widely applied to numerous domestic enterprises.
Although the preheating device of the plate preheater is continuously improved in recent years, the situation that the preheater is blocked can still occur in the using process, the pressure resistance of coal gas for burning the furnace is increased after the preheater is blocked, the gas throughput is reduced, the normal burning of the hot blast stove is influenced, the blast temperature level of the blast furnace is reduced, and the blast furnace is forced to stop wind even in severe cases.
Aiming at the treatment method after the blockage of the preheater, the prior art mostly adopts a method of blowing down to drive coal gas and then opening the preheater for flushing, so that the treatment time is long and the cost is high; and the problem of how to treat the preheater on line under the non-damping-down condition becomes a production process is difficult, so that a device for flushing and dredging the preheater of the hot blast stove on line after the preheater of the hot blast stove is blocked is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device for realizing online flushing and dredging after the blockage of a preheater under the non-damping condition of a blast furnace, aiming at the defects of the existing treatment method after the blockage of the preheater of the hot blast furnace.
The technical scheme of the utility model:
the on-line flushing device for the preheater of the hot blast stove comprises a flowmeter, a pressure gauge, a pressure pump, a water suction pump, a high-pressure water gun, a water drum, a connecting leather hose, a sewage discharge hole, a manual ball valve, a gas safety valve, a collector, a water inlet hole, a transition short pipe, a lower sealing flange, a water inlet gate valve, an upper sealing flange, a screw head, a data line and a computer. The high-pressure water gun, the pressure gauge, the flowmeter, the booster pump and the water pump are connected by a connecting leather hose to form the flushing device; the transition short pipe is connected with the lower sealing flange, the water inlet gate valve, the upper sealing flange and the screw head and then welded on the water inlet to assemble an online pressure tapping device; the water pump is arranged in the water bag; the high-pressure water gun is connected with the screw head; the pressure gauge, the flowmeter, the pressure pump and the water pump are connected with the computer through data lines to form a flushing water flow and pressure regulating device; the hole opening position of the sewage discharge hole is positioned at the lower side of the preheater, and the sewage discharge hole is connected with the manual ball valve, the coal gas safety valve, the collector and the sewage discharge pipe to form a drainage and collection device.
The utility model has the advantages that: the utility model can be used for on-line flushing and dredging after the hot blast heater is blocked, the operation is safe and convenient, and the dredging effect is obvious; the pressurized tapping device can be utilized, and the blast furnace damping down and the hot blast furnace are not needed to drive the coal gas, so that the efficiency is high and the cost is low; holes can be drilled at different positions of a gas inlet of the preheater under pressure, and a high-pressure water gun is used for washing the blocked part in all directions through a plurality of water inlets, so that the blocked part is dredged quickly and efficiently; the computer can be used for adjusting the washing water quantity and the water pressure, and on-line washing and dredging can be carried out under the condition of not damaging the internal structure of the preheater; the flushed sewage and sundries can be collected by the collector, so that the chemical examination is facilitated, the blockage reasons are comprehensively analyzed, and the prevention is realized in time; the data acquisition function of the computer can be utilized to count the water quantity and the water pressure during the flushing, so that the setting and the regulation of flushing parameters after the blockage of the preheater occurs again are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of an online washing device for a preheater of a hot blast stove.
In the figure: 1-water inlet, 2-transition short pipe, 3-lower sealing flange, 4-water inlet gate valve, 5-upper sealing flange, 6-screw head, 7-high pressure water gun, 8-pressure gauge, 9-flowmeter, 10-pressure pump, 11-connecting leather hose, 12-water pump, 13-water drum, 14-data line, 15-computer, 16-sewage discharge hole, 17-manual ball valve, 18-gas safety valve, 19-collector, 20-sewage discharge pipe, 21-preheater, 22-gas inlet shut-off valve, 23-gas bypass valve, 24-gas outlet shut-off valve, 25-flue gas inlet shut-off valve, 26-flue gas outlet shut-off valve and 27-sewage treatment pipeline.
Detailed Description
The invention will be further explained with reference to the following embodiments of the drawings.
The online flushing device for the preheater of the hot blast stove comprises a water inlet 1, a transition short pipe 2, a lower sealing flange 3, a water inlet gate valve 4, an upper sealing flange 5, a screw head 6, a high-pressure water gun 7, a pressure gauge 8, a flowmeter 9, a booster pump 10, a connecting leather hose 11, a water suction pump 12, a water drum 13, a data line 14, a computer 15, a sewage discharge hole 16, a manual ball valve 17, a gas safety valve 18, a collector 19 and a sewage discharge pipe 20. A high-pressure water gun 7, a pressure gauge 8, a flowmeter 9, a booster pump 10 and a water pump 12 are connected by a connecting leather hose 11 to form a flushing device; the transition short pipe 2 is connected with a lower sealing flange 3, a water inlet gate valve 4, an upper sealing flange 5 and a screw head 6 and then welded on the water inlet 1 to assemble an online pressure tapping device; the water pump 12 is arranged in the water bag 13; the high-pressure water gun 7 is connected with the screw head 6; the pressure gauge 8, the flowmeter 9, the booster pump 10 and the water pump 12 are connected with a computer 15 through a data line 14 to form a flushing water flow and pressure regulating device; the open hole position of the sewage discharge hole 16 is positioned at the lower side of the preheater, and the sewage discharge hole 16 is connected with a manual ball valve 17, a gas safety valve 18, a collector 19 and a sewage discharge pipe 20 to form a drainage and collection device.
The normal pressure water of storage in the water drum 13 is carried to high-pressure squirt 7 through suction pump 12, connection with leather hose 11, force (forcing) pump 10, flowmeter 9, manometer 8, and high-pressure squirt 7 links to each other with silk head 6, and the water inlet 1 of accessible different positions blocks up the position to carry out diversified washing to the preheater, is convenient for quick, the efficient mediation preheater.
The pressure gauge 8, the flowmeter 9, the pressure pump 10 and the water pump 12 are connected with the computer 15 through the data line 14, so that automatic starting and stopping of the pump and free regulation and control of water quantity and water pressure are realized, key data of the water quantity and the water pressure can be collected, and reference basis and data support are provided for subsequent blockage treatment of the preheater.
The sewage discharge hole 16 is connected with a manual ball valve 17, a gas safety valve 18 and a collector 19, so that the sewage and impurities can be collected during the flushing process while the water is discharged, the subsequent analysis is facilitated, and the blockage reason of the preheater is proved.
The experimental device of the utility model adopts the mode of the pressure pump 10 to pressurize the normal pressure water, and utilizes the water pressure of the high pressure water to realize the rapid dredging of the blocked part; the multiple water inlets 1 are opened on the side surface of the gas inlet pipeline of the preheater under pressure by using an under-pressure opening method, so that different parts can be washed, and the blocked parts can be favorably washed; the transition short pipe 2, the lower sealing flange 3, the water inlet gate valve 4, the upper sealing flange 5 and the screw head 6 are arranged above the water inlet, so that the safety of the operation process can be ensured; the implementation process of online under-pressure tapping does not need the hot blast stove to drive the coal gas for treatment, thereby greatly improving the dredging efficiency; after the sewage and sundries generated in the washing process are collected by the collector 19, the part which is not collected is drained into the sewage treatment pipeline through the drain pipe 20, so that the field environment is protected.
The method comprises the following specific using operation steps:
(1) and closing a flue gas inlet valve of the preheater, opening a flue gas bypass valve of the preheater, stopping preheating two hours in advance, reducing the temperature of the preheater to be below 60 ℃, and avoiding gas expansion caused by high temperature to damage the preheater.
(2) The opening position of the water inlet is selected, and after the position is determined, the transition short pipe, the lower sealing flange, the water inlet DN80 gate valve and the upper sealing flange are sequentially arranged above the water inlet, so that no gas leakage in the operation process can be ensured, and the safety is guaranteed.
(3) A professional sealing drilling machine is used for drilling, the drilling machine and an upper sealing flange are aligned in position before drilling, a water inlet DN80 gate valve is opened after sealing, 3 holes are opened on the right side of an upper slope of a gas inlet of a preheater, 2 holes are opened on the left side of the upper slope of the gas inlet of the preheater and serve as water inlets, the diameter of the drilled hole is 70mm, the drilling machine is withdrawn after the drilling is finished, the water inlet DN80 gate valve is closed, and a screw head is welded on the upper sealing flange.
(4) Utilize the leather hose to connect flowmeter, manometer, force (forcing) pump, suction pump, high-pressure squirt, assemble washing unit, link to each other flowmeter, manometer, force (forcing) pump, suction pump and computer, be convenient for carry on the regulation and control and the data record work of discharge, pressure.
(5) A water pump in the flushing device is placed in a water bag, a computer is used for controlling a pressure pump, water flow and pressure are set, and debugging work of equipment before online flushing is well done.
(6) Connecting a manual ball valve, a gas safety valve and a collector to the position of a sewage hole, checking and ensuring the smoothness of the sewage hole and the normal operation of the collector; the collector is connected with the blow-off pipe and the sewage treatment pipeline, so that the uncollected sewage and sundries can flow through the sewage treatment pipeline, and pollution is avoided.
(7) A high-pressure water gun in the flushing device is connected with a screw head, a gate valve of a water inlet DN80 is opened, and preparation work before flushing is well done.
(8) When the temperature of the preheating furnace is reduced to below 60 ℃, the water quantity and the water pressure are set by using a computer, a water pump operation button is clicked, and water is pumped into a high-pressure water gun.
(9) The high-pressure water in the high-pressure water gun penetrates through the water inlet to flush the blocked part inside the preheater, the blow-off hole is opened during flushing to drain water, and the blow-off condition of the blow-off hole and the change of the pressure difference behind the valve in front of the preheater valve are observed simultaneously to serve as the basis for dredging the preheater.
(10) During flushing, the high-pressure water gun can be switched at different water inlet positions, each water inlet position is flushed for 5-10min continuously, if no impurities flow out of the sewage draining hole, the water quantity and the water pressure are adjusted and controlled through the computer, the water quantity and the water pressure are increased step by step, and the sewage draining change condition of the sewage draining hole is observed.
(11) When the water sample in the sewage draining hole changes and impurities are flushed out, the sewage and the impurities are collected by the collector in time, so that the assay is facilitated; and meanwhile, continuously flushing, switching different water inlets for flushing, stopping flushing when the water sample in the sewage draining hole is recovered to be clear and no impurities exist, closing a water inlet gate valve at the coal gas inlet position of the preheater, extracting a high-pressure water gun, closing a water suction pump and the sewage draining hole, and finishing the on-line flushing work of the blockage of the preheater.
(12) The parameters such as the water volume and the water pressure of the washing are counted, the washed impurities and sewage samples are collected, the sample is tested, the blockage reason of the preheater is conveniently analyzed, and the prevention is timely carried out.

Claims (1)

1. The online washing unit of hot-blast furnace preheater, its characterized in that: a high-pressure water gun (7), a pressure gauge (8), a flowmeter (9), a booster pump (10) and a water pump (12) are connected by a connecting leather hose (11) to form the flushing device; the transition short pipe (2) is connected with the lower sealing flange (3), the water inlet gate valve (4), the upper sealing flange (5) and the screw head (6) and then welded on the water inlet (1) to assemble the online pressure tapping device; the water pump (12) is arranged in the water drum (13); the high-pressure water gun (7) is connected with the screw head (6); the pressure gauge (8), the flowmeter (9), the pressure pump (10) and the water pump (12) are connected with a computer (15) through a data line (14) to form a flushing water flow and pressure regulating device; the hole position of the blow-off hole (16) is positioned at the lower side of the preheater, and the blow-off hole (16) is connected with a manual ball valve (17), a coal gas safety valve (18), a collector (19) and a blow-off pipe (20) to form a drainage and collection device.
CN202022432285.XU 2020-10-28 2020-10-28 On-line flushing device for preheater of hot blast stove Active CN213778769U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022432285.XU CN213778769U (en) 2020-10-28 2020-10-28 On-line flushing device for preheater of hot blast stove

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022432285.XU CN213778769U (en) 2020-10-28 2020-10-28 On-line flushing device for preheater of hot blast stove

Publications (1)

Publication Number Publication Date
CN213778769U true CN213778769U (en) 2021-07-23

Family

ID=76911760

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022432285.XU Active CN213778769U (en) 2020-10-28 2020-10-28 On-line flushing device for preheater of hot blast stove

Country Status (1)

Country Link
CN (1) CN213778769U (en)

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