CN114891940A - Method for hot-face grouting of blast furnace carbon brick - Google Patents
Method for hot-face grouting of blast furnace carbon brick Download PDFInfo
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- CN114891940A CN114891940A CN202210402477.7A CN202210402477A CN114891940A CN 114891940 A CN114891940 A CN 114891940A CN 202210402477 A CN202210402477 A CN 202210402477A CN 114891940 A CN114891940 A CN 114891940A
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- pressure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
A method for hot face grouting of a blast furnace carbon brick relates to the technical field of blast furnace grouting, obtains the upper pressure control limit of a grouting machine, obtains the pressure relief pressure of an adjustable pressure relief valve, loads equipment to start grouting, and displays according to the pressure of a pressure gauge, wherein the grouting speed is slower when the pressure is closer to the set pressure of the grouting machine. And when the set pressure is reached, stopping grouting. And (5) maintaining the pressure, releasing the pressure and finishing grouting. The grouting material can be successfully pressed into the gap of the grouting area, and the carbon brick is not jacked up. The algorithm is reasonable and effective, is convenient to operate, has good grouting effect, and can be used in hot-face grouting of various blast furnace carbon bricks. And finally, the whole grouting work is completed according to the relation between the grouting quantity and the pressure maintaining time.
Description
Technical Field
The invention relates to the technical field of blast furnace grouting, in particular to a method for hot-face grouting of a blast furnace carbon brick.
Background
At present, the carbon brick grouting of a blast furnace can only be carried out by tapping from the outside of a furnace shell, welding grouting short pipes, connecting grouting pipelines and then grouting.
If the hot surface of the carbon brick in the hearth needs to be subjected to grouting, a device capable of sealing and connecting the carbon brick and a grouting pipe is needed, and after the sealing and connecting device is arranged, how to successfully press grouting material into a gap in a grouting area is realized, and meanwhile, the carbon brick is not jacked up, and an effective grouting method is not available.
In order to realize the hot-face grouting of the carbon brick, the invention provides a method for realizing the hot-face grouting of the carbon brick, and makes a breakthrough in the hot-face grouting construction of the carbon brick.
Disclosure of Invention
The invention provides a method for pressing the hot surface of a blast furnace carbon brick into a gap of a pressing area successfully, and solves the problem that the hot surface of the carbon brick cannot be pressed into the gap.
A method for hot-face grouting of a blast furnace carbon brick is characterized by comprising the following steps:
and obtaining the pressure control upper limit of the pulp press, and obtaining the pressure relief pressure of the adjustable pressure relief valve.
And setting the numerical values of the grouting machine and the adjustable pressure relief valve according to the algorithm, and installing the carbon brick pressing device and the sealing connection device.
The grouting machine, the grouting pipe, the adjustable pressure release valve, the grouting valve and the sealing connection device of the grouting control system are connected, and the carbon brick pressing device presses the carbon bricks.
Pressing the pressing slurry.
According to the pressure display of the pressure gauge, when the pressure is closer to the set pressure of the grouting machine, the grouting speed is slower. And when the set pressure is reached, stopping grouting.
And keeping the pressure for 10 minutes when the pressed pulp is less than 1 ton, and on the basis, increasing the pressure for 1 minute for every 100kg of pressed pulp.
And (5) after the pressure maintaining is finished, opening the adjustable pressure relief valve to relieve the pressure, and finishing the grouting.
The advantages are that:
the grouting control system can be used for successfully pressing grouting material into gaps in a grouting area, and simultaneously, carbon bricks are not jacked. The algorithm is reasonable and effective, is convenient to operate, has good grouting effect, and can be used in hot-face grouting of various blast furnace carbon bricks. And finally, the whole grouting work is completed according to the relation between the grouting quantity and the pressure maintaining time.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus used in the method.
The device comprises a pressure gauge 1, an adjustable pressure release valve 2, a mud jacking pipe 3, a mud jacking valve 4, an inclined rod 5, a carbon brick pressing device 6, a sealing connecting device 7, carbon bricks 8, a mud jacking pore channel 9, a mud jacking machine 11, a cross beam 12, a vertical rod 13, a first connecting pipe 14 and a second connecting pipe 15.
Detailed Description
The grouting control system comprises a grouting machine 11, a grouting pipe 3 and a sealing connecting device 7.
The outlet of the press 11 is connected to the inlet of the press pipe 3.
The outlet of the mud jacking pipe 3 is connected with the inlet of the sealing connecting device 7.
The outlet of the sealing connecting device 7 is connected with the inlet of the grouting duct 9, and the outlet of the grouting duct 9 is connected with a grouting area 10 below the carbon brick 8.
Further, the sealing connection device 7 includes a first connection pipe 14 and a second connection pipe 15.
One end of the first connecting pipe 14 is in threaded connection with the grouting pipe 3, and the other end of the first connecting pipe 14 extends into a gap between adjacent carbon bricks 8 and is in threaded connection with the carbon bricks 8.
The other end of the first connecting pipe 14 is fixedly connected with a second connecting pipe 15.
A second connecting pipe 15 extends into the inlet of the mud jacking leg 9. The grouting duct 9 is an opening formed in the carbon brick 8, so that grouting is facilitated.
The first connection pipe 14 is a metal pipe, and the second connection pipe 15 is a rubber pipe.
Further, a pressure gauge 1 is arranged on an outlet grouting pipe 3 of the grouting machine 11.
Furthermore, a grouting valve 4 is arranged on the grouting pipe 3.
Further, an adjustable pressure release valve 2 is arranged on the mud jacking pipe 3.
Further, an adjustable pressure relief valve 2 is arranged in front of the mud jacking pipe 3.
Furthermore, a plurality of carbon bricks 8 needing to be pressed with slurry are provided with carbon brick pressing devices 6.
One construction of the carbon brick pressing means 6 may be a structure including two inclined bars 5, one beam 12, two vertical bars 13.
The inclined rods 5 which are symmetrically inclined outwards are fixedly arranged above the cross beam 12, and the tops of the inclined rods 5 are supported on a fixed fulcrum at the upper part of the blast furnace to press the carbon brick pressing device 6. Two vertical rods 13 are fixedly arranged below the cross beam 12 and used for pressing the carbon bricks 8.
The carbon brick pressing devices 6 can be arranged in parallel to press the carbon bricks 8.
The angle of the tilting bar 5 varies as desired and may for example be 30-80 to the cross beam 12.
Specifically, it may be 30 °, 45 ° or 80 °.
The grouting method using the grouting control system comprises the following steps:
and (3) a control algorithm of grouting pressure: the pressure intensity of the grouting needs to be controlled at a reasonable level, the pressure intensity is too small, the grouting cannot enter a gap, and the carbon brick 8 is jacked up due to too large pressure intensity, so that the calculation control of the grouting pressure intensity is particularly important.
p Carbon brick ＝ρ Carbon brick *g*h Carbon brick ，p Carbon brick Is in units of Pa, ρ Carbon brick Unit of (b) is kg/m 3 G is in the unit of N/kg, h Carbon brick The unit of (d) is m. And is a multiplication number.
p Carbon brick Is the grouting pressure, rho, born by the carbon brick 8 Carbon brick Density of the carbon brick 8, g is gravitational acceleration, h Carbon brick Is the thickness of the carbon brick 8.
The carbon brick closing device 6's effect is the downforce that increases carbon brick 8, presses down crossbeam 12 and vertical rod 13 through diagonal brace 5, presses down 8 upper surfaces of carbon brick, and the downforce pressure that carbon brick closing device 6 applyed is:
p pressing device ＝F/S Carbon brick Wherein F is the downward pressure exerted by each diagonal strut 5 in units N, S Carbon brick The unit of the upper surface area of each carbon brick is square meter, p Pressing device In Pa.
p Pressing device Is the pressure to which the carbon brick pressing device 6 bears.
The carbon brick 8 is a cuboid brick S Carbon brick The upper surface area is long and wide.
According to the experiment, the upper limit of the pressure control of the pulp press 11 is p Pulp press ＝k*(p Carbon brick +p Pressing device ) And k is the insurance coefficient and generally takes a value of 0.6-0.8.
The algorithm for determining the pressure relief value of the adjustable pressure relief valve 2 is as follows:
if the pressure relief value is set too high, the protection effect cannot be achieved, and if the pressure relief value is set too low, the grouting effect can be influenced, and the reasonable pressure relief value is set to be within the range p through experiments Pulp press <p Adjustable pressure release valve <1.2*p Pulp press 。
The grouting method comprises the following steps:
1. and setting the values of the grouting machine 11 and the adjustable pressure relief valve 2 according to the algorithm, and installing the carbon brick pressing device 6 and the sealing connecting device 7.
2. The grouting valve 4 is opened, compressed air is introduced from the grouting pipe 3, so that gaps in the grouting area 10 are smoother, and the grouting effect is improved.
3. And connecting a grouting control system, pressing grouting material in, and preventing the grouting material from being quickly cured in the gap on the principle of constant speed at normal temperature and on the principle of first-speed and last-slow at high temperature (for example, more than 100 ℃).
4. According to the pressure of the pressure gauge 1, when the pressure reaches 50% of the set pressure of the press master 11 (the upper limit of the pressure control of the press master 11), the pressing speed is reduced to 60% of the normal speed.
5. According to the pressure of the pressure gauge 1, when the pressure reaches 70% of the set pressure of the pulper 11 (the upper limit of the pressure control of the pulper 11), the grouting speed is reduced to 30% of the normal speed.
6. According to the pressure of the pressure gauge 1, when the pressure reaches 90% of the set pressure of the press 11 (the upper limit of the pressure control of the press 11), the pressing speed is reduced to 10% of the normal speed.
7. According to the pressure display of the pressure gauge 1, when the pressure reaches 100% of the set pressure of the grouting machine 11 (the upper pressure control limit of the grouting machine 11), grouting pumping is stopped, and a pressure maintaining link is performed.
8. And determining the pressure maintaining time according to the pressed-in quantity of the pressure slurry, keeping the pressure for 10 minutes when the pressure maintaining time is less than 1 ton, and increasing the pressure maintaining time for 1 minute every 100kg of pressure slurry.
9. And (4) after the pressure maintaining is finished, opening the adjustable pressure relief valve 2 to relieve the pressure, then closing the grouting valve 4 and the adjustable pressure relief valve 2, releasing the pressure of the grouting pipe 3, and finishing grouting.
10. And (5) replacing the carbon brick pressing device 6 and the sealing connecting device 7 to the next position needing grouting, and repeating the steps.
The aforementioned normal speed is the normal operating speed of the selected press 11 itself, and may be 5 tons/hour, for example.
Claims (3)
1. A method for hot-face grouting of a blast furnace carbon brick is characterized by comprising the following steps:
the upper limit of the pressure control of the press machine (11) is p Pulp press ＝k*(p Carbon brick +p Pressing device ) K is the insurance coefficient, and the value is 0.6-0.8;
the algorithm for determining the pressure relief value of the adjustable pressure relief valve (2) is as follows:
p pulp press <p Adjustable pressure release valve <1.2*p Pulp press (ii) a Wherein:
p carbon brick ＝ρ Carbon brick *g*h Carbon brick (ii) a Wherein:
p carbon brick Is the mud jacking pressure born by the carbon brick (8), and the unit is Pa;
ρ carbon brick The density of the carbon brick (8) is kg/m 3 ；
g is the acceleration of gravity in N/kg
h Carbon brick Is the thickness of the carbon brick (8) in m;
p pressing device ＝F/S Carbon brick Wherein:
p pressing device The pressure born by the carbon brick pressing device (6) is Pa;
f is the downward pressure applied by the diagonal brace (5) and has the unit of N;
S carbon brick The unit is square meter, wherein the upper surface area of each carbon brick (8) is;
the grouting method comprises the following steps:
setting the numerical values of the grouting machine (11) and the adjustable pressure relief valve (2) according to the algorithm, and installing the carbon brick pressing device (6) and the sealing connection device (7);
a grouting machine (11), a grouting pipe (3), an adjustable pressure release valve (2), a grouting valve (4) and a sealing connection device (7) of a grouting control system are connected, and a carbon brick pressing device (6) presses a carbon brick (8);
pressing in the grouting material;
according to the pressure display of the pressure gauge (1), when the pressure is closer to the set pressure of the pulp press (11), the pulp pressing speed is slower; stopping grouting when the set pressure is reached;
when the pressed grouting material is less than 1 ton, maintaining the pressure for 10 minutes, and on the basis, increasing the pressure maintaining time for 1 minute every 100kg of grouting material;
and (5) after the pressure maintaining is finished, opening the adjustable pressure relief valve (2) to relieve the pressure, and finishing the grouting.
2. The method for hot side grouting of a blast furnace carbon brick according to claim 1, characterized by comprising the steps of:
when the pressure is closer to the set pressure of the pulp press (11), the pulp pressing speed is slower; the method specifically comprises the following steps:
when the pressure reaches 50% of the set pressure of the pulp press (11), the pulp pressing speed is reduced to 60% of the normal speed;
when the pressure reaches 70% of the set pressure of the pulp press (11), the pulp pressing speed is reduced to 30% of the normal speed;
when the pressure reaches 90% of the set pressure of the pulp press (11), the pulp pressing speed is reduced to 10% of the normal speed;
and when the pressure reaches 100% of the set pressure of the pulp press (11), stopping pulp pressing and pumping, and entering a pressure maintaining link.
3. The method for hot side grouting of a blast furnace carbon brick according to claim 1, characterized by comprising the steps of:
when the pressure slurry is pressed in, the speed is firstly high and then low according to the principle of constant speed at normal temperature and the temperature is increased.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210402477.7A CN114891940B (en) | 2022-04-18 | 2022-04-18 | Method for grouting hot face of blast furnace carbon brick |
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| CN202210402477.7A CN114891940B (en) | 2022-04-18 | 2022-04-18 | Method for grouting hot face of blast furnace carbon brick |
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| CN114891940B CN114891940B (en) | 2023-07-25 |
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