CN113959234B - Method for judging air leakage of combustion-supporting reversing valve of double-chamber kiln - Google Patents
Method for judging air leakage of combustion-supporting reversing valve of double-chamber kiln Download PDFInfo
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- CN113959234B CN113959234B CN202111161356.XA CN202111161356A CN113959234B CN 113959234 B CN113959234 B CN 113959234B CN 202111161356 A CN202111161356 A CN 202111161356A CN 113959234 B CN113959234 B CN 113959234B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002485 combustion reaction Methods 0.000 claims abstract description 114
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 claims description 35
- 238000001354 calcination Methods 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims 6
- 241001330002 Bambuseae Species 0.000 claims 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 6
- 239000011425 bamboo Substances 0.000 claims 6
- 239000007789 gas Substances 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 241000124033 Salix Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D2021/0007—Monitoring the pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for judging air leakage of a combustion-supporting reversing valve of a double-hearth kiln, which comprises the steps of judging the sealing condition of the combustion-supporting air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the value of a pressure gauge and time; the judging step comprises the steps of checking and judging that the tightness of the combustion air reversing valve A and the combustion air reversing valve B is good, and opening the combustion air reversing valve A, the combustion air reversing valve B and the combustion air releasing valve to vertical positions; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute to send combustion-supporting air into the combustion-supporting air pipe; when the air pipe reaches 40kPa, the combustion-supporting fan is stopped, the pressure is maintained, and the time t1 required for the pressure to be reduced from 40kPa to 0kPa is recorded. The invention can solve the problems of untimely judgment of air leakage and poor judgment accuracy of the existing combustion-supporting reversing valve of the double-chamber kiln.
Description
Technical Field
The invention relates to the technical field of steel manufacturing equipment, in particular to an air leakage judging method for a combustion-supporting reversing valve of a double-hearth kiln.
Background
The existing 5-seat double-hearth kiln with the design of 600t daily product in the enterprise mainly produces high-grade metallurgical lime with high activity and low impurity, and is supplied to a sintering plant and a converter steel plant. The double-hearth kiln takes the converter gas as fuel, effectively improves the recycling rate of the converter gas, realizes the energy conservation, environmental protection, consumption reduction and efficiency enhancement of the willow steel, and creates conditions for building green willow steel. The heat value of the gas used for the domestic double-hearth kiln production is generally 6320-12000 kJ/m 3 According to the design requirements of double-hearth kiln company, the lowest heat value of the converter gas used by the double-hearth kiln is 6320 kJ/m 3 。
Beginning in 2016, in order to further increase the energy-saving, environment-friendly and consumption-reducing forces and realize the maximization of economic benefits and environment-friendly benefits of enterprises, liu Gang increases the recovery amount of converter gas and reduces the heat value to 5000-5500 kJ/m 3 . The method has certain influence on the productivity of the double-hearth kiln, the quality control and the running load of each pressurizer device, and the double-hearth kiln can only be produced according to 500t/d organization. In order to ensure the stable heat value of the gas supplied to the double-hearth kiln and reduce the influence on the existing lime kiln, the professional technical demonstration proves that a part of coke oven gas with high heat value is mixed into the low heat value converter gas to meet the heat value of the fuel required by the normal production of the double-hearth kiln.
The double-hearth kiln belongs to a positive pressure kiln, the lower the calorific value of the gas used, the more the gas quantity and combustion-supporting air quantity are required during calcination, the pressure in the kiln rises along with the increase, and the sealing of the kiln is more easily damaged. In a kiln preheating zone, the gas flow is larger, so that the temperature of kiln waste gas is relatively higher, burning loss of the large flange silica gel of the spray gun occurs, the cover plate of the spray gun is deformed, and the service lives of the feeding cover plate and the sealing ring of the combustion air reversing valve are influenced. After combustion-supporting air leaks, the air quantity is insufficient, so that unstable flame is caused, the finished product materials grow in a bias way, and the furnace condition is accelerated to deteriorate. In order to stabilize kiln production, the equipment maintenance amount is reduced, the product quality is ensured, and the yield can only be reduced.
The double-hearth shaft kiln is provided with two barrels which are connected through a connecting channel positioned between the two hearths. The greatest advantages in the calcination process are parallel flow and heat accumulation, wherein the parallel flow means that when the combustion cylinder gas is calcined, the gas, the combustion air and the limestone are parallel downward, and the combustion flue gas is downward, which is beneficial to the calcination of high-quality active lime. The heat accumulation refers to that fuel combustion products, namely high-temperature smoke, enter the heat accumulation chamber through a connecting channel between two kiln chambers in the combustion cylinder. In the heat accumulation chamber, high-temperature flue gas flows from bottom to top, and heat is transferred to the limestone raw material in the preheating zone to preheat the stone to a higher temperature. And meanwhile, the temperature of the high-temperature waste gas is reduced to be lower after heat exchange, and the high-temperature waste gas is discharged out of the kiln chamber through a flue gas bag-type dust remover. After heat exchange, the heat of the flue gas is used for preheating stone, and the temperature of the flue gas is reduced, so that the aim of utilizing waste heat of the waste gas is fulfilled, and the kiln is guaranteed to have high heat efficiency.
The prior combustion-supporting air distribution device for the double-chamber shaft kiln comprises a kiln cylinder A, a kiln cylinder B, a combustion-supporting air inlet at the top of the kiln cylinder A, a combustion-supporting air reversing valve B7 and a combustion-supporting air pipe, wherein the combustion-supporting air inlet is respectively connected with a combustion-supporting air release valve 2 through the combustion-supporting air reversing valve A6 and the combustion-supporting air reversing valve B7, the combustion-supporting air reversing valve A6 is connected with the combustion-supporting air valve B7, the combustion-supporting air release valve 2 is connected with a combustion-supporting fan 1 through the combustion-supporting air pipe 3, spray guns 9 are respectively arranged in the middle sections of the kiln cylinder A and the kiln cylinder B, and a cooling air inlet pipe at the kiln bottom of the kiln cylinder A and the kiln cylinder B is connected with a cooling air release valve 5. In normal production, if the kiln cylinder A is a combustion chamber and the kiln cylinder B is a heat storage chamber, the combustion-supporting fan sequentially passes through the combustion-supporting air release valve 2 and the combustion-supporting air reversing valve 6 connected with the kiln cylinder A through the combustion-supporting air pipe to send combustion-supporting air into the kiln cylinder A (at the moment, the combustion-supporting air reversing valve A6 is in a horizontal position and the combustion-supporting air reversing valve B7 is in a vertical position); the combustion-supporting air is mixed with the fuel at the end of the spray gun 6 from top to bottom for calcination. The flue gas after calcination enters the heat accumulation chamber through the middle channel. The cooling air is blown from bottom to top through the cooling air pipe to cool the finished lime. In the heat accumulation chamber, the burnt flue gas and cooling air preheat the stone newly added in the heat accumulation chamber, and then enter a flue gas dust removal system. After the combustion period is over, the combustion air release valve 2 and the cooling air release valve 5 are opened to release the kiln pressure. The combustion air release valve changes position (the combustion air reversing valve A6 is in a vertical position, the combustion air reversing valve B7 is in a horizontal position), so that the exchange of the combustion chamber and the heat accumulation chamber is realized, and a new round of combustion starts.
The reversing valve of the double-chamber kiln is high in environmental temperature and frequent in action, and the sealing ring is easy to damage. After the sealing ring is leaked, insufficient gas combustion can be caused, and even potential safety hazards are generated. In order to ensure that the productivity of the double-hearth kiln is effectively guaranteed in all aspects, the inspection of the reversing valve sealing ring of the double-hearth kiln is particularly important in daily production. In the normal running of the furnace condition, the problem of damage of the sealing ring is found in time, which is beneficial to improving the productivity and quality of the kiln. The traditional method is to stop the kiln during the fixed repair, open an access door and observe the sealing condition of a valve. The disadvantage of the inspection is that the kiln temperature is high, and the high-temperature environment has a large influence on staff. When the kiln is stopped for inspection, the stability of kiln production is destroyed, time is consumed, and when the valve sealing ring is not usual, the artificial accurate judgment is difficult. When the reversing valve leaks air, the air leakage cannot be found in time, and the fluctuation of the product quality is easy to occur. In summary, in order to improve the timeliness and accuracy of judging the air leakage of the reversing valve, the method is specially provided under the condition of the periodic production characteristics of the double-hearth kiln.
Disclosure of Invention
The invention aims to solve the problems of untimely judgment of air leakage of the existing combustion-supporting reversing valve of the double-chamber kiln and poor judgment accuracy by providing the air leakage judgment method of the combustion-supporting reversing valve of the double-chamber kiln.
In order to solve the problems, the technical scheme of the invention is as follows: the method for judging the air leakage of the combustion-supporting reversing valve of the double-chamber kiln comprises the steps that combustion-supporting air inlets at the tops of a kiln cylinder A and a kiln cylinder B are respectively connected with a combustion-supporting air release valve through a combustion-supporting air reversing valve A, a combustion-supporting air reversing valve B and a combustion-supporting air pipe, the combustion-supporting air release valves are connected with combustion-supporting fans through the combustion-supporting air pipes, spray guns are arranged in the middle sections of the kiln cylinder A and the kiln cylinder B, a cooling air inlet pipe at the kiln bottom of the kiln cylinder A and a cooling air inlet pipe at the kiln bottom of the kiln cylinder B are connected with a cooling air release valve, and a pressure gauge is arranged on the combustion-supporting air pipes; wherein: the horizontal sealing surface of the combustion air reversing valve A is H1, and the vertical sealing surface of the combustion air reversing valve A is H2; the horizontal sealing surface of the combustion air reversing valve B is H3; the vertical sealing surface of the combustion air reversing valve B is H4;
judging the sealing condition of the combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the value of the pressure gauge and time; the judging step comprises the following steps:
step one: checking and judging that the tightness of the combustion air reversing valve A and the combustion air reversing valve B is good, and opening the combustion air reversing valve A, the combustion air reversing valve B and the combustion air release valve to vertical positions; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute to send combustion-supporting air into the combustion-supporting air pipe; when the combustion-supporting air pipe reaches 40kPa, stopping the combustion-supporting fan, maintaining the pressure, and recording time t1 required by the pressure to be reduced from 40kPa to 0 kPa;
step two: checking and judging that the tightness of the kiln chamber valves is good, and opening the combustion air release valve to a vertical position, and opening the combustion air reversing valve A and the combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute, and feeding combustion-supporting air into the kiln through a combustion-supporting air pipe; stopping the combustion-supporting fan when the kiln pressure reaches 40kPa, maintaining the pressure, and recording time t2 required by the pressure to be reduced from 40kPa to 0 kPa;
step three: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to vertical positions, starting a combustion fan, and when a combustion air pipe reaches 40kPa, observing the time required by the air pipe pressure to be reduced from 40kPa to 0kPa by using a pressure curve, and recording as t3; if t3 is less than t1, judging that the sealing performance of the vertical sealing surface of the combustion air reversing valve A or the vertical sealing surface of the combustion air reversing valve B is poor, namely the sealing performance of H2 or H4 is poor;
step four: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to be horizontal, enabling a kiln cylinder A and a kiln cylinder B to be in a sealing state, starting a combustion fan, and observing the time required for the kiln pressure to be reduced from 40kPa to 0kPa by utilizing a pressure curve when the kiln pressure reaches 40kPa, and recording as t4; if t4 is less than t2, the sealing performance of the horizontal sealing surface of the combustion air reversing valve A or the horizontal sealing surface of the combustion air reversing valve B is judged to be possibly poor, namely the sealing performance of H1 or H3 is poor.
Among the above technical schemes, more specific schemes may be: the judging step further comprises: an optical pyrometer is arranged on the top of a high-temperature combustion air outlet pipe on the connecting section of the kiln cylinder A and the kiln cylinder B;
step five: during normal production, observing a kiln production pressure curve, and judging that the sealing performance of H1 or H4 is poor when the kiln cylinder A is a calcination chamber and the combustion air pressure of the kiln cylinder A is periodically lower than that of the kiln cylinder B during calcination;
step six: during normal production, observing a kiln production pressure curve, and judging that the H2 or H3 tightness is poor when the kiln cylinder B is a calcination chamber and the combustion air pressure of the kiln cylinder B is periodically lower than that of the kiln cylinder A during calcination;
step seven: during normal production, observing a kiln channel temperature curve, when the kiln cylinder A is a calcination chamber, determining that the tightness of H1 or H4 is poor when the temperature of an optical pyrometer of the kiln cylinder A is periodically higher than that of the optical pyrometer of the kiln cylinder B during calcination and the curvature of the temperature curve is larger than a 45-degree inclination angle;
step eight: during normal production, observing a kiln channel temperature curve, and judging that the tightness of H2 or H3 is poor when the kiln cylinder B is a calcination chamber, wherein the temperature of the optical pyrometer of the kiln cylinder B is periodically higher than that of the optical pyrometer of the kiln cylinder A during calcination, and the curvature of the temperature curve is larger than a 45-degree inclination angle;
firstly, the first step, the second step, the third step and the fourth step are implemented, the pressure curve condition is observed, and the condition of a reversing valve sealing ring is comprehensively judged by combining the combustion air pressure curve and the optical pyrometer temperature curve in production; if the phenomena of the third step, the fifth step and the seventh step are found, judging that the H4 surface leaks; judging that the H3 surface leaks when the phenomena of the fourth step, the sixth step and the eighth step appear; if the phenomena of the third step, the sixth step and the eighth step are found, the leakage of the H2 surface is detected; when the phenomena of the fourth step, the fifth step and the seventh step are found, the H1 surface leakage is judged.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the method for judging the air leakage of the combustion-supporting reversing valve of the double-hearth kiln judges the air leakage condition of the combustion-supporting air pipe of the kiln hearth by utilizing the result of the periodical and symmetrical operation of the double-hearth kiln. The third and fourth steps are comparison with the normal pressure value; if the fifth step and the sixth step are the comparison of the pressure values of the pressure gauge during the calcination of the two bores in different periods; the seventh and eighth steps are comparison of two-chamber optical pyrometer thermometer values; when the combustion-supporting air leaks, less combustion-supporting air is used for calcination, the flame at the port of the spray gun becomes longer, and the temperature of the optical pyrometer rises faster.
According to the method for judging the air leakage of the combustion-supporting reversing valve of the double-hearth kiln, the sealing performance condition of the combustion-supporting reversing valve can be efficiently found, and the strength of manual check valves on site is reduced. The air leakage condition of the valve is found, and the air leakage of the valve plate can be treated in time by replacing a valve sealing ring or adjusting a valve plate mechanism of the valve. Avoiding the occurrence of large change of furnace conditions. Moreover, the sealing performance of the combustion air reversing valve is easy to change, and the method can be used for finding out abnormality in real time and responding.
Drawings
FIG. 1 is a schematic diagram of the structure of a double-chamber kiln A according to an embodiment of the invention when burning;
FIG. 2 is a block diagram of a combustion air distribution device according to an embodiment of the present invention in a leak tightness test;
FIG. 3 is a block diagram of a dual chamber kiln seal test in accordance with an embodiment of the present invention;
FIG. 4 is a graph of the first, second, third, and fourth steps of a dual chamber kiln seal test in accordance with an embodiment of the present invention;
FIG. 5 is a graph of combustion air pressure in a sixth step of a double chamber kiln seal test according to an embodiment of the present invention;
FIG. 6 is an optical pyrometer temperature profile for a seventh step in a dual bore kiln seal test in accordance with an embodiment of the present invention.
Detailed Description
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
the method for judging the air leakage of the combustion-supporting reversing valve of the double-chamber kiln as shown in figures 1 to 3 comprises the steps that combustion-supporting air inlets at the tops of a kiln cylinder A and a kiln cylinder B are respectively connected with a combustion-supporting air release valve 2 through a combustion-supporting air reversing valve A6, a combustion-supporting air reversing valve B7 and a combustion-supporting air pipe 3, the combustion-supporting air release valves 2 are connected with a combustion-supporting fan 1 through the combustion-supporting air pipe 3, spray guns 9 are arranged in the middle sections of the kiln cylinder A and the kiln cylinder B, cooling air inlet pipes at the bottoms of the kiln cylinder A and the kiln cylinder B are connected with a cooling air release valve 5, a pressure gauge 4 is arranged on the combustion-supporting air pipe 3, and an optical pyrometer 8 is arranged on the top of a high-temperature combustion-supporting air outlet pipe on the connecting section of the kiln cylinder A and the kiln cylinder B. Wherein: the horizontal sealing surface of the combustion air reversing valve A is H1, and the vertical sealing surface of the combustion air reversing valve A is H2; the horizontal sealing surface of the combustion air reversing valve B is H3; the vertical sealing surface of the combustion air reversing valve B is H4.
Judging the sealing condition of the combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the value of the pressure gauge and time; the judging step comprises the following steps:
step one: checking and judging that the tightness of the combustion air reversing valve A and the combustion air reversing valve B is good, and opening the combustion air reversing valve A, the combustion air reversing valve B and the combustion air release valve to vertical positions; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute to send combustion-supporting air into the combustion-supporting air pipe; when the combustion-supporting air pipe reaches 40kPa, the combustion-supporting fan is stopped, the pressure is maintained, and the time t1 required for the pressure to be reduced from 40kPa to 0kPa is recorded.
Step two: checking and judging that the tightness of the kiln chamber valves is good, and opening the combustion air release valve to a vertical position, and opening the combustion air reversing valve A and the combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute, and feeding combustion-supporting air into the kiln through a combustion-supporting air pipe; when the kiln pressure reaches 40kPa, the combustion-supporting fan is stopped, the pressure is maintained, and the time t2 required for the pressure to reach from 40kPa to 0kPa is recorded.
Step three: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to vertical positions, starting a combustion fan, and when a combustion air pipe reaches 40kPa, observing the time required by the air pipe pressure from 40kPa to 0kPa by using a pressure curve, and recording as t3; if t3 is less than t1, judging that the sealing performance of the vertical sealing surface of the combustion air reversing valve A or the vertical sealing surface of the combustion air reversing valve B is poor, namely the H2 or H4 sealing performance is poor.
Step four: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to be horizontal, enabling a kiln cylinder A and a kiln cylinder B to be in a sealing state, starting a combustion fan, and observing the time required by the kiln pressure from 40kPa to 0kPa by using a pressure curve when the kiln pressure reaches 40kPa, and recording as t4; if t4 is less than t2, the sealing performance of the horizontal sealing surface of the combustion air reversing valve A or the horizontal sealing surface of the combustion air reversing valve B is judged to be possibly poor, namely the sealing performance of H1 or H3 is poor. The first, second, third and fourth steps are shown in fig. 4 and 12, 11 is the pressure curve of the first and second steps for maintaining pressure, 20 is the pressure maintaining time t3 (t 4), and 21 is the pressure maintaining time t1 (t 2) when the seal of H1 or H3 is leaked.
Step five: and during normal production, observing a kiln production pressure curve, and judging that the sealing performance of H1 or H4 is poor when the kiln cylinder A is a calcination chamber and the combustion air pressure of the kiln cylinder A is periodically lower than that of the kiln cylinder B during calcination.
Step six: during normal production, observing a kiln production pressure curve, and judging that the H2 or H3 tightness is poor when the kiln cylinder B is a calcination chamber and the combustion air pressure of the kiln cylinder B is periodically lower than that of the kiln cylinder A during calcination; in the sixth step, as shown in fig. 5 and 15, the pressure value of the combustion-supporting air duct during the combustion of the kiln tube a is 16, the pressure value of the combustion-supporting air duct during the combustion of the kiln tube B is 16, 17 is the combustion time period of the kiln tube a, and 18 is the combustion time period of the kiln tube B.
Step seven: during normal production, observing a kiln channel temperature curve, when the kiln cylinder A is a calcination chamber, determining that the tightness of H1 or H4 is poor when the temperature of an optical pyrometer of the kiln cylinder A is periodically higher than that of the optical pyrometer of the kiln cylinder B during calcination and the curvature of the temperature curve is larger than a 45-degree inclination angle; the seventh step is shown in fig. 6 and 17, wherein the combustion time period of the kiln tube A is 18, the combustion time period of the kiln tube B is 19, the optical pyrometer temperature value of the kiln tube A is the optical pyrometer temperature value of the kiln tube B is 20.
Step eight: and during normal production, observing a kiln channel temperature curve, and judging that the H2 or H3 tightness is poor when the kiln cylinder B is a calcination chamber, the optical pyrometer temperature of the kiln cylinder B is periodically higher than that of the kiln cylinder A during calcination, and the curvature of the temperature curve is larger than a 45-degree inclination angle.
Firstly, the first step, the second step, the third step and the fourth step are implemented, the pressure curve condition is observed, and the condition of a reversing valve sealing ring is comprehensively judged by combining the combustion air pressure curve and the optical pyrometer temperature curve in production; if the phenomena of the third step, the fifth step and the seventh step are found, judging that the H4 surface leaks; judging that the H3 surface leaks when the phenomena of the fourth step, the sixth step and the eighth step appear; if the phenomena of the third step, the sixth step and the eighth step are found, the leakage of the H2 surface is detected; when the phenomena of the fourth step, the fifth step and the seventh step are found, the H1 surface leakage is judged.
In the implementation steps, the first step and the second step are key standards for judging air leakage, and the measured value must be reliable. By implementing the tightness test of the third step and the fourth step, the difference can be found by comparing the standard with the first step and the second step.
The sealing performance condition of the reversing valve can be effectively judged by combining the pressure gauge curve (fifth step, sixth step) and the optical pyrometer temperature change (seventh step, eighth step) curve with the third step and the fourth step.
When the combustion fan is started, the operation speed of the combustion fan is not easy to be too high, the operation speed is controlled to be between 250 and 350 revolutions per minute, otherwise, the accuracy of pressure value measurement is affected.
And the seventh step and the eighth step are to judge the leakage condition by utilizing the characteristics that when the combustion-supporting air leaks, less combustion-supporting air is used for calcination, the flame of a spray gun port becomes longer and the temperature of an optical pyrometer rises faster.
Claims (2)
1. The utility model provides a combustion-supporting switching-over valve air leakage judgement method of double bore kiln, includes that the combustion-supporting air entry at kiln section of thick bamboo A and kiln section of thick bamboo B top is connected with a combustion-supporting air release valve through combustion-supporting air switching-over valve A and combustion-supporting air switching-over valve B and combustion-supporting tuber pipe respectively, the combustion-supporting air release valve is connected with the combustion-supporting fan through the combustion-supporting tuber pipe, kiln section of thick bamboo A with the middle section of kiln section of thick bamboo B all is equipped with the spray gun, kiln section of thick bamboo A with a cooling air entry pipe connection cooling air release valve in kiln bottom of kiln section of thick bamboo B is connected, its characterized in that: a pressure gauge is arranged on the combustion-supporting air pipe; wherein: the horizontal sealing surface of the combustion air reversing valve A is H1, and the vertical sealing surface of the combustion air reversing valve A is H2; the horizontal sealing surface of the combustion air reversing valve B is H3; the vertical sealing surface of the combustion air reversing valve B is H4;
judging the sealing condition of the combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the value of the pressure gauge and time; the judging step comprises the following steps:
step one: checking and judging that the tightness of the combustion air reversing valve A and the combustion air reversing valve B is good, and opening the combustion air reversing valve A, the combustion air reversing valve B and the combustion air release valve to vertical positions; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute to send combustion-supporting air into the combustion-supporting air pipe; when the combustion-supporting air pipe reaches 40kPa, stopping the combustion-supporting fan, maintaining the pressure, and recording time t1 required by the pressure to be reduced from 40kPa to 0 kPa;
step two: checking and judging that the tightness of the kiln chamber valves is good, and opening the combustion air release valve to a vertical position, and opening the combustion air reversing valve A and the combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250-350 revolutions per minute, and feeding combustion-supporting air into the kiln through a combustion-supporting air pipe; stopping the combustion-supporting fan when the kiln pressure reaches 40kPa, maintaining the pressure, and recording time t2 required by the pressure to be reduced from 40kPa to 0 kPa;
step three: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to vertical positions, starting a combustion fan, and when a combustion air pipe reaches 40kPa, observing the time required by the air pipe pressure to be reduced from 40kPa to 0kPa by using a pressure curve, and recording as t3; if t3 is less than t1, judging that the sealing performance of the vertical sealing surface of the combustion air reversing valve A or the vertical sealing surface of the combustion air reversing valve B is poor, namely the sealing performance of H2 or H4 is poor;
step four: in daily production, setting a combustion air reversing valve A and a combustion air reversing valve B to be horizontal, enabling a kiln cylinder A and a kiln cylinder B to be in a sealing state, starting a combustion fan, and observing the time required for the kiln pressure to be reduced from 40kPa to 0kPa by utilizing a pressure curve when the kiln pressure reaches 40kPa, and recording as t4; if t4 is less than t2, the sealing performance of the horizontal sealing surface of the combustion air reversing valve A or the horizontal sealing surface of the combustion air reversing valve B is judged to be possibly poor, namely the sealing performance of H1 or H3 is poor.
2. The method for judging air leakage of the combustion-supporting reversing valve of the double-hearth kiln according to claim 1, wherein the method comprises the following steps of: the judging step further comprises: an optical pyrometer is arranged on the top of a high-temperature combustion air outlet pipe on the connecting section of the kiln cylinder A and the kiln cylinder B;
step five: during normal production, observing a kiln production pressure curve, and judging that the sealing performance of H1 or H4 is poor when the kiln cylinder A is a calcination chamber and the combustion air pressure of the kiln cylinder A is periodically lower than that of the kiln cylinder B during calcination;
step six: during normal production, observing a kiln production pressure curve, and judging that the H2 or H3 tightness is poor when the kiln cylinder B is a calcination chamber and the combustion air pressure of the kiln cylinder B is periodically lower than that of the kiln cylinder A during calcination;
step seven: during normal production, observing a kiln channel temperature curve, when the kiln cylinder A is a calcination chamber, determining that the tightness of H1 or H4 is poor when the temperature of an optical pyrometer of the kiln cylinder A is periodically higher than that of the optical pyrometer of the kiln cylinder B during calcination and the curvature of the temperature curve is larger than a 45-degree inclination angle;
step eight: during normal production, observing a kiln channel temperature curve, and judging that the tightness of H2 or H3 is poor when the kiln cylinder B is a calcination chamber, wherein the temperature of the optical pyrometer of the kiln cylinder B is periodically higher than that of the optical pyrometer of the kiln cylinder A during calcination, and the curvature of the temperature curve is larger than a 45-degree inclination angle;
firstly, the first step, the second step, the third step and the fourth step are implemented, the pressure curve condition is observed, and the condition of a reversing valve sealing ring is comprehensively judged by combining the combustion air pressure curve and the optical pyrometer temperature curve in production; if the phenomena of the third step, the fifth step and the seventh step are found, judging that the H4 surface leaks; judging that the H3 surface leaks when the phenomena of the fourth step, the sixth step and the eighth step appear; if the phenomena of the third step, the sixth step and the eighth step are found, the leakage of the H2 surface is detected; when the phenomena of the fourth step, the fifth step and the seventh step are found, the H1 surface leakage is judged.
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| JP2014119241A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
| CN110671925A (en) * | 2019-10-14 | 2020-01-10 | 中冶焦耐(大连)工程技术有限公司 | Closed quick feeding system for double-chamber shaft kiln |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
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| JP2014119241A (en) * | 2012-12-19 | 2014-06-30 | Azbil Corp | Leakage detection method of valve, and combustion facility |
| CN110671925A (en) * | 2019-10-14 | 2020-01-10 | 中冶焦耐(大连)工程技术有限公司 | Closed quick feeding system for double-chamber shaft kiln |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
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Application publication date: 20220121 Assignee: Xingye Liugang New Materials Technology Co.,Ltd. Assignor: Guangxi Liugang New Material Technology Co.,Ltd. Contract record no.: X2023980046044 Denomination of invention: Method for Judging Air Leakage of the Combustion Supporting Reversing Valve in a Double Chamber Kiln Granted publication date: 20230929 License type: Common License Record date: 20231108 Application publication date: 20220121 Assignee: Wuxuan Liugang New Material Technology Co.,Ltd. Assignor: Guangxi Liugang New Material Technology Co.,Ltd. Contract record no.: X2023980046042 Denomination of invention: Method for Judging Air Leakage of the Combustion Supporting Reversing Valve in a Double Chamber Kiln Granted publication date: 20230929 License type: Common License Record date: 20231108 Application publication date: 20220121 Assignee: Guangxi Fanggang New Material Technology Co.,Ltd. Assignor: Guangxi Liugang New Material Technology Co.,Ltd. Contract record no.: X2023980046040 Denomination of invention: Method for Judging Air Leakage of the Combustion Supporting Reversing Valve in a Double Chamber Kiln Granted publication date: 20230929 License type: Common License Record date: 20231108 Application publication date: 20220121 Assignee: Liuzhou Shanhai Technology Co.,Ltd. Assignor: Guangxi Liugang New Material Technology Co.,Ltd. Contract record no.: X2023980046036 Denomination of invention: Method for Judging Air Leakage of the Combustion Supporting Reversing Valve in a Double Chamber Kiln Granted publication date: 20230929 License type: Common License Record date: 20231108 |
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