CN113959234A - Method for judging air leakage of combustion-supporting reversing valve of double-hearth kiln - Google Patents
Method for judging air leakage of combustion-supporting reversing valve of double-hearth kiln Download PDFInfo
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- CN113959234A CN113959234A CN202111161356.XA CN202111161356A CN113959234A CN 113959234 A CN113959234 A CN 113959234A CN 202111161356 A CN202111161356 A CN 202111161356A CN 113959234 A CN113959234 A CN 113959234A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 103
- 238000007789 sealing Methods 0.000 claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 claims description 36
- 238000001354 calcination Methods 0.000 claims description 30
- 230000003287 optical effect Effects 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 238000005338 heat storage Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 241000124033 Salix Species 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 238000010586 diagram Methods 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
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism 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
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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 is characterized in that the sealing condition of the combustion-supporting reversing valve is judged by utilizing a pressure curve, wherein the pressure curve is a curve corresponding to the numerical value of a pressure gauge and time; the judging step comprises the steps of checking and judging that the sealing performance of a combustion air reversing valve A and a combustion air reversing valve B is good, and opening the combustion air reversing valve A, the combustion air reversing valve B and a combustion air releasing valve to vertical positions; starting a variable-frequency combustion-supporting fan to feed combustion-supporting air into a combustion-supporting air pipe at the rotating speed of 250 plus 350 revolutions per minute; when the air pipe reaches 40kpa, the combustion fan is stopped, pressure maintaining is carried out, 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 and poor judgment accuracy of air leakage of the combustion-supporting reversing valve of the existing double-hearth 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 double-hearth kilns with 600t daily output are mainly used for producing high-grade metallurgical lime with high activity and low impurities and supplying the high-grade metallurgical lime to sintering plants and converter steel plants. The double-hearth kiln takes the converter gas as fuel, effectively improves the recovery rate of the converter gas, realizes energy conservation and environmental protection, consumption reduction and efficiency improvement of the willow steel, and creates conditions for building the green willow steel. The calorific value of the gas used in domestic double-hearth kiln production is 6320-12000 kj/m3According to the design requirement of the double-hearth kiln company, the minimum calorific value of the converter gas used by the double-hearth kiln is 6320 kj/m3。
Beginning in 2016, in order to further increase the energy-saving, environment-friendly and consumption-reducing force and maximize the economic benefit and the environmental benefit of enterprises, the recovery amount of converter gas is increased by the willow steel, and the heat value is reduced to 5000-5500 kj/m3. The method has certain influence on the productivity exertion of the double-hearth kiln, the quality control and the operation load of each pressurizing machine device, and the double-hearth kiln can only organize the production according to 500 t/d. In order to ensure the stable calorific value of the gas supplied to the double-hearth kiln and reduce the influence on the existing lime kiln, the technical personnel argue that a part of coke oven gas with high calorific value is doped into the converter gas with low calorific value so as to meet the calorific 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 used coal gas is, the more the coal gas amount and the combustion-supporting air amount are required during calcination, the pressure in the kiln is increased along with the increase of the coal gas amount and the combustion-supporting air amount, and the sealing of the kiln is easier to damage. In a preheating zone of a kiln, the gas flow is large, so that the temperature of waste gas of the kiln is relatively high, burning loss of large-flange silica gel of a spray gun occurs, a cover plate of the spray gun is deformed, and the service lives of a feeding cover plate and a sealing ring of a combustion air reversing valve are influenced. After combustion-supporting air leaks, the air quantity is insufficient, so that flame instability is caused, finished materials are generated partially, and the deterioration of the furnace condition is accelerated. In order to stabilize the production of the kiln, reduce the overhaul quantity of equipment, ensure the product quality and only reduce the yield.
The double-chamber shaft kiln has two cylinders connected through a connecting passage located between the two chambers. The most important advantages in the calcining process are 'parallel flow' and 'heat accumulation', wherein 'parallel flow' refers to that when the gas in the combustion cylinder is calcined, the gas, the combustion-supporting air and the limestone are parallel and downward, and the combustion flue gas is downward, so that high-quality active lime can be calcined. The heat accumulation means that in the combustion cylinder, the combustion product of the fuel, namely high-temperature flue gas, enters a heat accumulation chamber through a connecting channel between two kiln chambers. In the heat storage chamber, high-temperature flue gas flows from bottom to top, heat is transferred to the limestone raw material in the preheating zone, and stone is preheated to a higher temperature. Meanwhile, after the high-temperature waste gas exchanges heat, the temperature of the high-temperature waste gas is reduced to be lower, and the high-temperature waste gas is discharged out of the kiln chamber through the flue gas bag-type dust collector. After heat exchange, the heat of the flue gas is used for preheating stone materials, and the temperature of the flue gas is reduced, so that the purpose of utilizing waste heat of the waste gas is achieved, and the high heat efficiency of the kiln is ensured.
The combustion-supporting air distributor of the existing double-chamber shaft kiln comprises a kiln barrel A and a kiln barrel B, wherein combustion-supporting air inlets at the tops of the kiln barrel A and the kiln barrel 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 of the kiln barrel B, the combustion-supporting air release valve 2 is connected with a combustion-supporting fan 1 through a combustion-supporting air pipe 3, spray guns 9 are arranged in the middle sections of the kiln barrel A and the kiln barrel B, and cooling air inlet pipes at the bottoms of the kiln barrel A and the kiln barrel B are connected with a cooling air release valve 5. During normal production, if the kiln cylinder A is a combustion chamber and the kiln cylinder B is a heat storage chamber, a combustion-supporting fan sends combustion-supporting air into the kiln cylinder A through a combustion-supporting air pipe and sequentially passes through a combustion-supporting air release valve 2 and a combustion-supporting air reversing valve 6 connected with 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); and the combustion-supporting air is mixed with the fuel at the end of the spray gun 6 from top to bottom for calcination. The calcined flue gas enters the heat storage chamber through the intermediate channel. And cooling air is blown from bottom to top through a cooling air pipe to cool the finished product lime. In the heat storage chamber, the combusted flue gas and cooling air preheat newly added stones in the heat storage chamber and then enter a flue gas dust removal system. After the end of the combustion period, the combustion air release valve 2 and the cooling air release valve 5 are opened, releasing the pressure in the kiln. The combustion-supporting air release valve changes positions (the combustion-supporting air reversing valve A6 is in a vertical position, and the combustion-supporting air reversing valve B7 is in a horizontal position), so that the combustion chamber and the heat storage chamber are exchanged, and a new round of combustion starts.
The environment temperature of the reversing valve of the double-hearth kiln is high, the reversing valve of the double-hearth kiln frequently acts, and the sealing ring is easily damaged. After the sealing ring leaks, the gas can be insufficiently combusted, and even potential safety hazards can be generated. In order to guarantee the capacity of the double-hearth kiln, the inspection of the reversing valve sealing ring of the double-hearth kiln is particularly important in daily production. In normal operation under the furnace condition, the problem of sealing ring damage can be found in time, and the yield and the quality of the kiln can be improved. The traditional method is to stop the kiln and open an access door to observe the condition of valve sealing during fixed maintenance. The disadvantages of the inspection are that the temperature of the kiln is high, and the influence of the high-temperature environment on the staff is large. When the kiln is stopped for inspection, the stability of the kiln production is damaged, the time is consumed, and when the valve sealing ring is not flat, the manual accurate judgment is difficult. When the reversing valve leaks air, the air leakage cannot be found in time, so that the product quality is easy to fluctuate. In conclusion, the method is particularly provided under the condition of the periodic production characteristic of the double-hearth kiln in order to improve the timeliness and the accuracy of judging the air leakage of the reversing valve.
Disclosure of Invention
The invention aims to solve the problem of providing a method for judging air leakage of a combustion-supporting reversing valve of a double-hearth kiln, so as to solve the problems that the air leakage of the combustion-supporting reversing valve of the existing double-hearth kiln is not judged timely and the judgment accuracy is poor.
In order to solve the problems, the technical scheme of the invention is as follows: the method for judging 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 valve is connected with a combustion-supporting fan through the combustion-supporting air pipe, spray guns are arranged at the middle sections of the kiln cylinder A and the kiln cylinder B, cooling air inlet pipes at the bottom of the kiln cylinder A and the kiln cylinder B are connected with a cooling air release valve, and 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 a combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the numerical value of the pressure gauge and time; the judging step comprises:
the method comprises the following steps: checking and judging that the sealing performance 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 to feed combustion-supporting air into a combustion-supporting air pipe at the rotating speed of 250 plus 350 revolutions per minute; when the air pipe reaches 40kpa, stopping the combustion fan, maintaining pressure, and recording the time t1 required by the pressure to be reduced from 40kpa to 0 kpa;
step two: checking and judging that the sealing performance of each kiln chamber valve is good, opening a combustion air release valve to a vertical position, and opening a combustion air reversing valve A and a combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250 plus 350 revolutions per minute to feed combustion-supporting air into the kiln through a combustion-supporting air pipe; when the kiln pressure reaches 40kpa, stopping the combustion fan, maintaining the pressure, and recording the 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 at vertical positions, starting a combustion fan, observing the time required by the pressure of an air pipe to be reduced from 40kpa to 0kpa by using a pressure curve when a combustion air pipe reaches 40kpa, and recording the time as t 3; if t3 is less than t1, 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 judged to be 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 positions, enabling a kiln cylinder A and a kiln cylinder B to be in a sealed state, starting a combustion fan, observing the time required by the reduction of the kiln pressure from 40kpa to 0kpa by using a pressure curve when the kiln pressure reaches 40kpa, and recording the time as t 4; 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 poor, namely the sealing performance of H1 or H3 is poor.
In the above technical solution, a more specific solution may be: the judging step further comprises: an optical pyrometer is arranged at the top of a high-temperature combustion air outlet pipe above 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 when the kiln cylinder A is a calcining chamber, judging that the sealing performance of H1 or H4 is poor if the pressure of combustion-supporting air of the kiln cylinder A is periodically lower than that of combustion-supporting air of the kiln cylinder B during calcination;
step six: during normal production, observing a kiln production pressure curve, and when the kiln cylinder B is a calcining chamber, judging that the sealing performance of H2 or H3 is poor if the pressure of combustion-supporting air of the kiln cylinder B is periodically lower than that of combustion-supporting air of the kiln cylinder A during calcination;
step seven: during normal production, observing a temperature curve of a kiln channel, and when a kiln cylinder A is a calcining chamber, periodically judging that the temperature curve of the optical pyrometer of the kiln cylinder A is higher than that of the optical pyrometer of the kiln cylinder B during calcining, and judging that the sealing performance of H1 or H4 is poor when the curvature of the temperature curve is more than a 45-degree inclination angle;
step eight: during normal production, observing a temperature curve of a kiln channel, and when a kiln cylinder B is a calcining chamber, periodically judging that the temperature curve of an optical pyrometer of the kiln cylinder B is higher than that of the optical pyrometer during calcining of the kiln cylinder A, and judging that the sealing performance of H2 or H3 is poor when the curvature of the temperature curve is more than a 45-degree inclination angle;
firstly, carrying out the operations of the first step, the second step, the third step and the fourth step, observing the condition of a pressure curve, and comprehensively judging the condition of a reversing valve sealing ring by combining a combustion-supporting wind pressure curve and an 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 is leaked when the phenomena of the fourth step, the sixth step and the eighth step appear; if phenomena of the third step, the sixth step and the eighth step are found, H2 surface leakage is detected; if 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 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 periodic and symmetrical operation results of the double-hearth kiln. If the third step and the fourth step are comparison with the normal pressure value; if the fifth step and the sixth step are carried out, the pressure values of the pressure gauges during the calcination of two chambers in different periods are compared; comparing the temperature table values of the two-chamber optical pyrometer in the seventh step and the eighth step; the characteristics that combustion-supporting air for calcination is less, flame at the port of the spray gun is lengthened and the temperature of the optical pyrometer is increased quickly when the combustion-supporting air leaks are utilized.
According to the method for judging 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 manually checking the valve on site is reduced. The air leakage condition of the valve can be found, and the air leakage of the valve plate can be timely treated by replacing the valve sealing ring or adjusting the valve plate mechanism of the valve. Avoid the furnace condition from generating large change. Moreover, the sealing performance of the combustion air reversing valve is easy to change, and the method can find the abnormity in real time and respond.
Drawings
FIG. 1 is a schematic view of a double-chamber kiln cylinder A according to an embodiment of the present invention;
FIG. 2 is a structural diagram of a combustion-supporting air distribution device in a sealing test according to an embodiment of the present invention;
FIG. 3 is a block diagram of a dual-chamber kiln seal test according to an embodiment of the present invention;
FIG. 4 is a graph of a first step, a second step, a third step, and a fourth step of a double-hearth kiln sealability test according to an embodiment of the present invention;
FIG. 5 is a combustion-supporting air pressure curve diagram of the sixth step in the double-chamber kiln tightness test of the embodiment of the invention;
fig. 6 is a graph of the optical pyrometer temperature at the seventh step of the dual-chamber kiln sealability test of an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in further detail with reference to the accompanying drawings:
the method for judging air leakage of the combustion-supporting reversing valve of the double-hearth kiln shown in the figures 1 to 3 comprises the steps that a combustion-supporting air inlet at the top of a kiln barrel A and a combustion-supporting air inlet at the top of a kiln barrel 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 valve 2 is connected with a combustion-supporting fan 1 through the combustion-supporting air pipe 3, spray guns 9 are arranged at the middle sections of the kiln barrel A and the kiln barrel B, cooling air inlet pipes at the bottoms of the kiln barrel A and the kiln barrel B are connected with a cooling air release valve 5, a pressure gauge 4 is installed on the combustion-supporting air pipe 3, and an optical pyrometer 8 is arranged at the top of a high-temperature combustion-supporting air outlet pipe above the connecting section of the kiln barrel A and the kiln barrel 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; and the vertical sealing surface of the combustion air reversing valve B is H4.
Judging the sealing condition of a combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the numerical value of the pressure gauge and time; the judging step comprises:
the method comprises the following steps: checking and judging that the sealing performance 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 to feed combustion-supporting air into a combustion-supporting air pipe at the rotating speed of 250 plus 350 revolutions per minute; when the air pipe reaches 40kpa, the combustion fan is stopped, pressure maintaining is carried out, and the time t1 required for the pressure to be reduced from 40kpa to 0kpa is recorded.
Step two: checking and judging that the sealing performance of each kiln chamber valve is good, opening a combustion air release valve to a vertical position, and opening a combustion air reversing valve A and a combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250 plus 350 revolutions per minute to feed combustion-supporting air into the kiln through a combustion-supporting air pipe; when the kiln pressure reaches 40kpa, the combustion fan is stopped, pressure maintaining is carried out, and the time t2 required by the pressure 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 at vertical positions, starting a combustion fan, observing the time required by the pressure of an air pipe from 40kpa to 0kpa by using a pressure curve when a combustion air pipe reaches 40kpa, and recording the time as t 3; and 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 positions, enabling a kiln cylinder A and a kiln cylinder B to be in a sealed state, starting a combustion fan, 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 the time as t 4; 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 poor, namely the sealing performance of H1 or H3 is poor. The first step, the second step, the third step and the fourth step are shown in fig. 4, 12 is a pressure curve of the pressure holding of the first step and the second step, 11 is a pressure curve of the pressure holding of the third step and the fourth step when H1 or H3 is sealed and leaked, 20 is a pressure holding time t3 (t 4), and 21 is a pressure holding time t1 (t 2).
Step five: and during normal production, observing a production pressure curve of the kiln, and when the kiln cylinder A is a calcining chamber, judging that the sealing performance of H1 or H4 is poor if the pressure of combustion-supporting air of the kiln cylinder A is periodically lower than that of combustion-supporting air of the kiln cylinder B during calcining.
Step six: during normal production, observing a kiln production pressure curve, and when the kiln cylinder B is a calcining chamber, judging that the sealing performance of H2 or H3 is poor if the pressure of combustion-supporting air of the kiln cylinder B is periodically lower than that of combustion-supporting air of the kiln cylinder A during calcination; and a sixth step is shown in figure 5, wherein 15 is the pressure value of the combustion-supporting air pipe when the kiln cylinder A burns, 16 is the pressure value of the combustion-supporting air pipe when the kiln cylinder B burns, 17 is the combustion time period of the kiln cylinder A, and 18 is the combustion time period of the kiln cylinder B.
Step seven: during normal production, observing a temperature curve of a kiln channel, and when a kiln cylinder A is a calcining chamber, periodically judging that the temperature curve of the optical pyrometer of the kiln cylinder A is higher than that of the optical pyrometer of the kiln cylinder B during calcining, and judging that the sealing performance of H1 or H4 is poor when the curvature of the temperature curve is more than a 45-degree inclination angle; the seventh step is as shown in fig. 6, wherein 17 is a combustion time period of the kiln cylinder a, 18 is a combustion time period of the kiln cylinder B, 19 is a temperature value of the optical pyrometer during combustion of the kiln cylinder a, and 20 is a temperature value of the optical pyrometer during combustion of the kiln cylinder B.
Step eight: during normal production, a kiln channel temperature curve is observed, when a kiln cylinder B is a calcining chamber, the temperature curve of the optical pyrometer of the kiln cylinder B is periodically higher than that of the optical pyrometer of the kiln cylinder A during calcining, and when the curvature of the temperature curve is greater than an inclination angle of 45 degrees, the sealing performance of H2 or H3 is judged to be poor.
Firstly, carrying out the operations of the first step, the second step, the third step and the fourth step, observing the condition of a pressure curve, and comprehensively judging the condition of a reversing valve sealing ring by combining a combustion-supporting wind pressure curve and an 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 is leaked when the phenomena of the fourth step, the sixth step and the eighth step appear; if phenomena of the third step, the sixth step and the eighth step are found, H2 surface leakage is detected; if 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 criteria for judging air leakage, and the measured values must be reliable. By performing the third step and the fourth step of tightness test, the difference can be found by aligning with the first step and the second step.
The sealing performance condition of the reversing valve can be effectively judged by combining the curves of the pressure gauge (the fifth step and the sixth step) and the temperature change curve of the optical pyrometer (the seventh step and the eighth step) with the third step and the fourth step.
When the combustion-supporting fan is started, the running speed of the combustion-supporting fan is not too high, the operation speed is controlled to be between 250 and 350 revolutions per minute, and otherwise, the accuracy of pressure value measurement is influenced.
And the seventh step and the eighth step are used for judging the leakage condition by utilizing the characteristics that when the combustion-supporting air leaks, the combustion-supporting air for calcination is less, the flame at the port of the spray gun is lengthened, and the temperature of the optical pyrometer is quickly increased.
Claims (2)
1. The utility model provides a method is judged to combustion-supporting switching-over valve of double chamber kiln leaks out, includes that the combustion-supporting air inlet at kiln barrel A and kiln barrel B top is connected with a combustion-supporting air release valve through combustion-supporting air switching-over valve first and combustion-supporting air switching-over valve second and combustion-supporting tuber pipe respectively, combustion-supporting air release valve is connected with combustion-supporting fan through combustion-supporting tuber pipe, kiln barrel A with kiln barrel B's middle section all is equipped with the spray gun, kiln barrel A with the cooling air inlet pipe at the bottom of the kiln of kiln barrel B connects a cooling air release valve and connects 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 a combustion air reversing valve by using a pressure curve, wherein the pressure curve is a curve corresponding to the numerical value of the pressure gauge and time; the judging step comprises:
the method comprises the following steps: checking and judging that the sealing performance 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 to feed combustion-supporting air into a combustion-supporting air pipe at the rotating speed of 250 plus 350 revolutions per minute; when the air pipe reaches 40kpa, stopping the combustion fan, maintaining pressure, and recording the time t1 required by the pressure to be reduced from 40kpa to 0 kpa;
step two: checking and judging that the sealing performance of each kiln chamber valve is good, opening a combustion air release valve to a vertical position, and opening a combustion air reversing valve A and a combustion air reversing valve B to a horizontal position; starting a variable-frequency combustion-supporting fan at the rotating speed of 250 plus 350 revolutions per minute to feed combustion-supporting air into the kiln through a combustion-supporting air pipe; when the kiln pressure reaches 40kpa, stopping the combustion fan, maintaining the pressure, and recording the 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 at vertical positions, starting a combustion fan, observing the time required by the pressure of an air pipe to be reduced from 40kpa to 0kpa by using a pressure curve when a combustion air pipe reaches 40kpa, and recording the time as t 3; if t3 is less than t1, 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 judged to be 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 positions, enabling a kiln cylinder A and a kiln cylinder B to be in a sealed state, starting a combustion fan, observing the time required by the reduction of the kiln pressure from 40kpa to 0kpa by using a pressure curve when the kiln pressure reaches 40kpa, and recording the time as t 4; 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 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, characterized by comprising the following steps of: the judging step further comprises: an optical pyrometer is arranged at the top of a high-temperature combustion air outlet pipe above 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 when the kiln cylinder A is a calcining chamber, judging that the sealing performance of H1 or H4 is poor if the pressure of combustion-supporting air of the kiln cylinder A is periodically lower than that of combustion-supporting air of the kiln cylinder B during calcination;
step six: during normal production, observing a kiln production pressure curve, and when the kiln cylinder B is a calcining chamber, judging that the sealing performance of H2 or H3 is poor if the pressure of combustion-supporting air of the kiln cylinder B is periodically lower than that of combustion-supporting air of the kiln cylinder A during calcination;
step seven: during normal production, observing a temperature curve of a kiln channel, and when a kiln cylinder A is a calcining chamber, periodically judging that the temperature curve of the optical pyrometer of the kiln cylinder A is higher than that of the optical pyrometer of the kiln cylinder B during calcining, and judging that the sealing performance of H1 or H4 is poor when the curvature of the temperature curve is more than a 45-degree inclination angle;
step eight: during normal production, observing a temperature curve of a kiln channel, and when a kiln cylinder B is a calcining chamber, periodically judging that the temperature curve of an optical pyrometer of the kiln cylinder B is higher than that of the optical pyrometer during calcining of the kiln cylinder A, and judging that the sealing performance of H2 or H3 is poor when the curvature of the temperature curve is more than a 45-degree inclination angle;
firstly, carrying out the operations of the first step, the second step, the third step and the fourth step, observing the condition of a pressure curve, and comprehensively judging the condition of a reversing valve sealing ring by combining a combustion-supporting wind pressure curve and an 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 is leaked when the phenomena of the fourth step, the sixth step and the eighth step appear; if phenomena of the third step, the sixth step and the eighth step are found, H2 surface leakage is detected; if 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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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 |