CN111847909B - Spray gun, spray gun control method and lime kiln with spray gun - Google Patents

Spray gun, spray gun control method and lime kiln with spray gun Download PDF

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CN111847909B
CN111847909B CN201910340954.XA CN201910340954A CN111847909B CN 111847909 B CN111847909 B CN 111847909B CN 201910340954 A CN201910340954 A CN 201910340954A CN 111847909 B CN111847909 B CN 111847909B
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sliding
value
telescopic length
partition plate
sliding sleeve
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CN111847909A (en
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周浩宇
刘前
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)

Abstract

The application discloses a spray gun, a spray gun control method and a lime kiln with the spray gun, a fixed baffle plate arranged in the spray gun divides a vertical pipe of the spray gun into a light fuel area and a thick fuel area, when coal powder passes through a bent pipe, due to the inertia effect, the concentration of the coal powder in the thick fuel area is high, the concentration of the coal powder in the light fuel area is low, the concentration difference of the coal powder in the light fuel area and the thick fuel area is adjusted by adjusting the telescopic positions of a sliding baffle plate and a sliding sleeve, a primary combustion area with low coal powder concentration and a secondary combustion area with high coal powder concentration are naturally formed at the outlet of the spray gun in the lime kiln, NOx formed by combustion in the primary combustion area can be better reduced into N2 in the secondary combustion area, and the content of NOx in the lime production process is reduced.

Description

Spray gun, spray gun control method and lime kiln with spray gun
Technical Field
The application relates to the technical field of lime kilns, in particular to a spray gun, a spray gun control method and a lime kiln with the spray gun.
Background
Generally, the lime is quicklime (CaO), which is an important auxiliary material widely used in the metallurgical industry, and is used as an additive in the processes of sintering iron-making raw materials, iron-making reduction, pretreatment of molten iron and external refining, so as to play roles in adjusting the alkalinity of furnace charge, slagging, desulfurization and the like.
The lime kiln is a core device in the lime production process, raw material limestone is heated to 1100 ℃ in the lime kiln, and the product lime is generated through calcination. In the production process of the lime kiln, fuels such as coal powder, coal gas and the like need to be uniformly sprayed into a kiln chamber through a spray gun arranged on the kiln to be combusted, so as to supply heat to the kiln chamber. FIG. 1 shows the structure of the existing lime kiln, during the production process, limestone raw material enters a kiln chamber from a raw material inlet 1 at the upper part of the kiln chamber, is calcined in a kiln chamber 2 of the lime kiln, and is discharged from a lime outlet 3 at the lower part of the kiln chamber 2; pulverized coal fuel is fed into the kiln chamber 2 through a pulverized coal spray gun 4, combustion-supporting air is fed into the kiln chamber 2 through a lower air pipe 5, a central air cap 6 plays a role in homogenizing kiln chamber air flow, and combustion tail gas is discharged out of the kiln chamber 2 from a waste gas outlet 7 and is discharged outside after dust removal and other treatment. The structure of the spray gun 4 is shown in fig. 2, and the spray gun 4 is a single-channel structure and mainly comprises a horizontal pipe 41, an elbow pipe 42 and a vertical pipe 43. The spray gun 4 uniformly sprays coal powder to the kiln chamber through a single channel and then burns.
However, since the calcination temperature of the material is as high as 1100 ℃, the kiln chamber temperature of the calcination section of the lime kiln generally needs to be 1300 ℃, and under such a high-temperature environment, a large amount of NOx (nitrogen oxide) is generated by fuel combustion, so that the NOx in the tail gas of the lime kiln is very high, which is not favorable for the environmental protection performance of equipment. Therefore, how to reduce the amount of NOx generated in the lime production process becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The application provides a spray gun, a spray gun control method and a lime kiln with the spray gun, so as to reduce the generation amount of NOx in the lime production process.
In a first aspect, the present application provides a spray gun comprising: a horizontal pipe at the inlet, an elbow pipe at the middle section and a vertical pipe at the outlet, wherein the elbow pipe is connected with the horizontal pipe and the vertical pipe, wherein a fixed clapboard is arranged in the vertical pipe and divides the vertical pipe into two identical semi-cylindrical channels, the two semi-cylindrical channels are respectively a light fuel area and a thick fuel area, one end of the fixed clapboard close to the bent pipe is embedded into the telescopic sliding clapboard, the variation range of the telescopic length H1 of the sliding partition plate is 0-H1max, one end of the tube wall of the concentrated fuel area close to the outlet of the spray gun is embedded into a telescopic sliding sleeve, the variation range of the telescopic length H2 of the sliding sleeve is 0-H2max, the sliding sleeve is semi-cylindrical, the telescopic length H1 of the sliding partition plate and the telescopic length H2 of the sliding sleeve are moved, and further the fuel concentration difference delta C between the light fuel area and the thick fuel area is controlled.
With reference to the first aspect, in a first implementation manner of the first aspect, a partition sliding groove is formed in the fixed partition, a sliding partition and a partition hydraulic cylinder are installed in the partition sliding groove, and a cylinder body of the partition hydraulic cylinder moves to drive the sliding partition to move in the partition sliding groove, so that the purpose that the sliding partition is telescopic is achieved.
With reference to the first aspect, in a second implementation manner of the first aspect, a sleeve sliding groove is formed in a tube wall of the concentrated fuel region, a sliding sleeve is installed in the sleeve sliding groove, a sleeve hydraulic cylinder is arranged in the sleeve sliding groove in the fixed partition plate, and a cylinder body of the sleeve hydraulic cylinder moves to drive the sliding sleeve to move in the sleeve sliding groove, so that the purpose that the sliding sleeve is telescopic is achieved.
With reference to the first implementable manner of the first aspect, in a third implementable manner of the first aspect, the length of the partition sliding groove is equal to the sum of the length of the sliding partition and the length of the partition hydraulic cylinder in an original state, the piston extension length of the partition hydraulic cylinder in the original state is zero, and at this time, the telescopic length H1 of the sliding partition is 0.
With reference to the second implementable manner of the first aspect, in a fourth implementable manner of the first aspect, a length of the sleeve sliding groove is equal to a sum of the length of the sliding sleeve and the length of the sleeve hydraulic cylinder in an original state, an extension length of a piston of the sleeve hydraulic cylinder in the original state is zero, and at this time, a telescopic length H2 of the sliding sleeve is 0.
With reference to any one of the implementation manners of the first aspect, in a fifth implementation manner of the first aspect, the controller is further configured to control the partition hydraulic cylinder to move the sliding partition so that the telescopic length H1 of the sliding partition changes from H1max to 0, and to control the sleeve hydraulic cylinder to move the sliding sleeve so that the telescopic length H2 of the sliding sleeve changes from H2max to 0.
In a second aspect, the present application also provides a lance control method for controlling the sliding closure and the sliding sleeve of the lance of the first aspect, comprising:
determining an optimal value H (1, i) of the telescopic length H1 of the sliding partition plate and an optimal value H (2, i) of the telescopic length H2 of the sliding sleeve;
keeping the telescopic length H1 of the sliding partition board constant at H (1, i), moving the sliding sleeve to change the telescopic length H2 of the sliding sleeve from H2max to 0;
acquiring NO in tail gas in the process of changing the telescopic length H2 of the sliding sleeve from H2max to 0 X The value of the corresponding expansion length H2 when the concentration is minimum, and the value H2 at the moment is a new optimal value H (2, i + 1);
fixing the telescopic length H2 of the sliding sleeve to be H (2, i +1), and moving the sliding partition plate to change the telescopic length H1 of the sliding partition plate from H1max to 0;
obtaining the extension and retraction of the sliding partitionNO in exhaust gas during the change of length H1 from H1max to 0 X The value of the corresponding expansion length H1 when the concentration is minimum, and the value H1 at the moment is a new optimal value H (1, i + 1);
calculating variation values of the telescopic lengths H1 and H2 based on the new optimum value H (1, i +1) and the previous optimum value H (1, i), and the new optimum value H (2, i +1) and the previous optimum value H (2, i);
if the change value delta 1 of the telescopic length H1 is less than or equal to the designated threshold value a1, and the change value delta 2 of the telescopic length H2 is less than or equal to the designated threshold value a2, the new optimal value H (1, i +1) and the new optimal value H (2, i +1) at the moment are the telescopic values of the sliding partition plate and the sliding sleeve respectively;
if the variation Δ 1 of the telescopic length H1 is greater than the specified threshold a1 or the variation Δ 2 of the telescopic length H2 is greater than the specified threshold a2, the new optimum value H (1, i +1) is assigned to the previous optimum value H (1, i);
repeatedly executing the step of keeping the telescopic length H1 of the sliding partition constant to be H (1, i), and moving the sliding sleeve to change the telescopic length H2 of the sliding sleeve from H2max to 0 until the change value of the telescopic length H1 is less than or equal to the specified threshold value a1 and the change value of the telescopic length H2 is less than or equal to the specified threshold value a2, wherein the i is the number of times of repeated execution.
With reference to the second aspect, in a first implementation manner of the second aspect, the initial optimal value H (1, i) of the sliding partition expansion length H1 is H1max, and the initial optimal value H (2, i) of the sliding sleeve expansion length H2 is H2 max.
With reference to the second aspect, in a second implementation manner of the second aspect, the variation Δ 1 of the telescopic length H1 is calculated according to the following formula:
Figure BDA0002040682770000031
with reference to the second aspect, in a third implementation manner of the second aspect, the variation Δ 2 of the telescopic length H2 is calculated according to the following formula:
Figure BDA0002040682770000032
in a third aspect, an embodiment of the present application further provides a lime kiln with a lance, where the lance in the first aspect is provided on a side wall of a kiln chamber of the lime kiln.
According to the technical scheme, the application provides the spray gun, the spray gun control method and the lime kiln with the spray gun, a vertical pipe of the spray gun is divided into a light fuel area and a thick fuel area by a fixed partition plate arranged in the spray gun, when coal powder passes through a bent pipe, due to the inertia effect, the concentration of the coal powder in the thick fuel area is high, the concentration of the coal powder in the light fuel area is low, the concentration difference of the coal powder in the light fuel area and the thick fuel area is adjusted by adjusting the telescopic positions of a sliding partition plate and a sliding sleeve, a primary combustion area with low coal powder concentration and a secondary combustion area with high coal powder concentration are naturally formed at the outlet of the spray gun in the lime kiln, NOx formed by combustion in the primary combustion area can be reduced into N2 in the secondary combustion area, and the content of NOx in the lime production process is reduced.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiment will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive laboriousness.
FIG. 1 is a schematic structural diagram of a current lime kiln provided herein;
FIG. 2 is a schematic view of a current lance in a lime kiln according to the present application;
FIG. 3 is a schematic structural diagram of a double-channel telescopic lance for a lime kiln provided by the present application;
FIG. 4 is a cross-sectional view in the direction of the vertical tube A-A of FIG. 3 as provided herein;
FIG. 5 is an enlarged view of the stationary baffle of portion B of FIG. 3 provided herein;
FIG. 6 is an enlarged view of the fuel rich zone of portion C of FIG. 3 provided herein;
FIG. 7 is a flow chart of a dual-channel telescopic lance control method for a lime kiln according to the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
The technical scheme of the application is based on a low NOx combustion theory of fuel staged combustion, and the fuel staged combustion means that fuel is sent into a hearth in a staged mode, and a primary combustion area with low fuel concentration and a secondary combustion area with high fuel concentration are formed in a combustion area. The NOx formed in the primary combustion zone is reduced to N2 at the high temperature and reducing atmosphere in the secondary combustion zone, which significantly reduces NOx emissions from the combustion process.
Based on the above fuel staged combustion theory, referring to fig. 3, the present application provides a lance comprising: the horizontal pipe 41 at the inlet, the bent pipe 42 at the middle section and the vertical pipe 43 at the outlet, wherein the bent pipe 42 connects the horizontal pipe 41 and the vertical pipe 43, the vertical pipe 43 is internally provided with a fixed baffle 44, the fixed baffle 44 divides the vertical pipe 43 into two identical semi-cylindrical passages, specifically, as shown in fig. 4, the two semi-cylindrical passages are a light fuel area 431 and a thick fuel area 432 respectively, the pulverized coal enters the spray gun through the horizontal pipe 41, when the pulverized coal passes through the spray gun bent pipe 42, due to the inertia effect, part of the pulverized coal has high concentration and part of the pulverized coal has low concentration, and the fixed baffle 44 can guide the pulverized coal into different fuel areas. In addition, as shown in fig. 3, one end of the fixed partition 44 close to the elbow 42 is embedded into a telescopic sliding partition 45, the sliding partition 45 is movable in the fixed partition 44 and can extend out of the fixed partition 44 for a certain length, specifically, the telescopic length H1 of the sliding partition 45 ranges from 0 max to H1 max; the telescopic sliding sleeve 46 is embedded in one end, close to the outlet of the spray gun, of the tube wall of the concentrated fuel zone 432, the sliding sleeve 46 is semi-cylindrical, the sliding sleeve 46 is movable in the tube wall of the concentrated fuel zone 432 and can extend out of the tube wall for a certain length, and specifically, the telescopic length H2 of the sliding sleeve 46 ranges from 0 to H2 max. In practical use, the sliding partition plate 45 and the sliding sleeve 46 can be continuously moved, the telescopic distance between the sliding partition plate 45 and the sliding sleeve 46 can be further adjusted, the height difference between the light fuel area 431 and the thick fuel area 432 and the concentration difference of the coal dust in the light fuel area 431 and the thick fuel area 432 can be controlled, and further the adjustment of the concentration difference of the coal dust in the primary combustion area and the secondary combustion area at the outlet of the spray gun can be realized, so that NOx formed by combustion of the coal dust in the primary combustion area can be better reduced into N2 in the secondary combustion area, and the content of NOx in the lime production process can be reduced.
Referring to fig. 5, a partition sliding groove 441 is formed in the fixed partition 44, a sliding partition 45 and a partition hydraulic cylinder 47 are installed in the partition sliding groove 441, and the partition hydraulic cylinder 47 drives the sliding partition 45 to move in the partition sliding groove 441 by the movement of a cylinder body. The telescopic length H1 of the sliding partition plate 45 is further adjusted by controlling the partition plate hydraulic cylinder 47, so that the concentration difference of the pulverized coal in the light fuel area 431 and the concentrated fuel area 432 meets the actual production requirement. The length of the diaphragm sliding groove 441 is equal to the sum of the lengths of the sliding diaphragm 45 and the diaphragm hydraulic cylinder 47 in the original state, the piston extension length of the diaphragm hydraulic cylinder 47 in the original state is zero, when the piston extension length of the diaphragm hydraulic cylinder 47 is zero, the length of the sliding diaphragm 45 extending beyond the fixed diaphragm 44 is 0, that is, H1 is 0, and when the piston extension length of the diaphragm hydraulic cylinder 47 is the longest, the length of the sliding diaphragm 45 extending beyond the fixed diaphragm 44 is H1 is H1 max.
Referring to fig. 6, a sleeve sliding groove 442 is formed on the wall of the concentrated fuel area 432, the sliding sleeve 46 is installed in the sleeve sliding groove 442, a sleeve hydraulic cylinder 48 is installed in the sleeve sliding groove 442 of the fixed partition 44, and the sleeve hydraulic cylinder 48 moves to drive the sliding sleeve 46 to move in the sleeve sliding groove 442. The telescopic length H2 of the sliding sleeve 46 is further adjusted by controlling the sleeve hydraulic cylinder 48, so that the concentration difference of the pulverized coal in the light fuel area 431 and the concentrated fuel area 432 meets the actual production requirement. The length of the sleeve sliding groove 442 is equal to the sum of the lengths of the sliding sleeve 46 and the sleeve hydraulic cylinder 48 in the original state, the piston extension length of the sleeve hydraulic cylinder 48 in the original state is zero, when the piston extension length of the sleeve hydraulic cylinder 48 is zero, the length of the sliding sleeve 46 extending out of the rich fuel zone 432 is 0, i.e., H2 is 0, and when the piston extension length of the sleeve hydraulic cylinder 48 is the longest, i.e., H2 is H2 max.
Initially, the telescopic lengths of the sliding partition 45 and the sliding sleeve 46 are adjusted to be the maximum, that is, H1 is H1max and H2 is H2max, at which the height difference Δ H between the light fuel region 431 and the rich fuel region 432 is the maximum, and the fuel concentration difference Δ C between the light fuel region 431 and the rich fuel region 432 is the maximum. Then, the telescopic length H1 of the sliding partition plate 45 is kept unchanged, the telescopic length H2 of the sliding sleeve 46 is adjusted, the optimal value of H2 is determined by detecting the content of tail gas NOx in the adjusting process, the telescopic length H1 of the sliding partition plate 45 is adjusted by keeping the telescopic length of the sliding sleeve 46 at the optimal value, and the optimal value of H1 is determined by detecting the content of tail gas NOx in the adjusting process. After the optimum value of H1 and the optimum value of H2 are determined, the telescopic lengths of the sliding partition 45 and the sliding sleeve 46 in the spray gun of the present application are fixed according to the values.
In addition, as shown in fig. 5-6, the spray gun of the present application further comprises a controller 49 for controlling the diaphragm hydraulic cylinder 47 to move the sliding diaphragm 45 to change its telescopic length H1 from H1max to 0, and for controlling the sleeve hydraulic cylinder 48 to move the sliding sleeve 46 to change its telescopic length H2 from H2max to 0.
According to the scheme, the fixed partition plate 44 arranged in the spray gun divides the vertical pipe 43 into the light fuel area 431 and the thick fuel area 432, when coal dust passes through the bent pipe 42, the coal dust enters the thick fuel area 432 and the light fuel area 431 respectively, the coal dust concentration difference of the light fuel area 431 and the thick fuel area 432 is adjusted by adjusting the telescopic positions of the sliding partition plate 45 and the sliding sleeve 46, the primary combustion area with low coal dust concentration and the secondary combustion area with high coal dust concentration are naturally formed at the outlet of the spray gun in the lime kiln, and then NOx formed by combustion in the primary combustion area can be better reduced into N2 in the secondary combustion area, so that the content of NOx in the lime production process is reduced.
Referring to fig. 7, the present application also provides a lance control method, in which a controller 49 controls a sliding partition and a sliding sleeve of the lance shown in fig. 3, and a pulverized coal concentration difference Δ C and a pulverized coal height difference Δ H between a primary combustion zone and a secondary combustion zone have a great influence on a NOx emission level of staged combustion of fuel, and in order to obtain an optimal low NOx combustion effect, the method provided by the present application includes:
step 101, determining an optimal value H (1, i) of the telescopic length H1 of the sliding partition plate and an optimal value H (2, i) of the telescopic length H2 of the sliding sleeve, wherein the optimal values H (1, i) and H (2, i) are considered as current optimal values when the step is executed, and the optimal values can be changed through continuous iterative replacement; further, when the two-channel telescopic spray gun provided by the application is not in use, the maximum value of the telescopic length of the sliding partition plate and the maximum value of the telescopic length of the sliding sleeve are the initial optimal values of the sliding partition plate and the sliding sleeve, namely the initial optimal values of the telescopic length of the sliding partition plate H1, namely H1max, and the initial optimal values of the telescopic length of the sliding sleeve H2, namely H2 max. By the control method, one of the telescopic lengths of the sliding partition plate and the sliding sleeve is fixed alternately, and the optimal telescopic length value of the sliding partition plate and the sliding sleeve is determined by an extreme value comparison method.
Step 102, keeping the telescopic length H1 of the sliding partition plate to be H (1, i) unchanged, moving the sliding sleeve to enable the telescopic length H2 of the sliding sleeve to be changed from H2max to 0; after repeated execution, the optimal value H (1, i) in this step is replaced with the new optimal value H (1, i +1) obtained in the previous step, the telescopic length H1 of the sliding partition plate needs to be fixed as the current optimal value in this step, the telescopic length of the sliding sleeve is firstly changed, and then the optimal value of the telescopic length of the sliding sleeve is obtained.
103, acquiring NO in tail gas in the process that the telescopic length H2 of the sliding sleeve changes from H2max to 0 X The value of the corresponding expansion length H2 when the concentration is minimum, and the value H2 at the moment is a new optimal value H (2, i + 1); NO in exhaust gas in this application X The concentration is monitored in real time when the pulverized coal is output from the spray gun and combusted, and NO is added every time on the premise that the coal powder input rate at the inlet of the spray gun is not changed X The concentration change means that the telescopic length of the sliding sleeve or the sliding partition plate is changed, so that the NO is monitored in real time X Different NO can be obtained by changing the concentration X The concentration value corresponds to the telescopic length of the sliding partition plate or the sliding sleeve.
On the other hand, in the embodiment of the present application, the telescopic lengths of the sliding partition and the sliding sleeve are determined by the stroke of the hydraulic cylinder, so that the telescopic lengths of the sliding partition and the sliding sleeve can be directly obtained by the stroke of the hydraulic cylinder.
Step 104, fixing the telescopic length H2 of the sliding sleeve to be H (2, i +1), and moving the sliding partition plate to change the telescopic length H1 of the sliding partition plate from H1max to 0; if the new optimal value H (2, i +1) of H2 is determined in the above step, the optimal value of the sliding partition expansion length is obtained by changing the expansion length of the sliding partition with the value fixed.
105, acquiring NO in the tail gas in the process that the telescopic length H1 of the sliding partition plate is changed from H1max to 0 X The value of the stretch length H1 corresponding to the minimum concentration is the new optimum value H (1, i +1) for the value H1 at that time.
And 106, calculating the change values of the telescopic lengths H1 and H2 according to the new optimal value H (1, i +1) and the previous optimal value H (1, i), and the new optimal value H (2, i +1) and the previous optimal value H (2, i).
Further, the change value Δ 1 of the telescopic length H1 is calculated according to the following formula:
Figure BDA0002040682770000061
the variation Δ 2 of the telescopic length H2 is calculated according to the following formula:
Figure BDA0002040682770000062
where i is the number of iterations performed. Taking the initial optimal values of H (1,0) ═ H1max and H (2,0) ═ H2max as examples, the repeated execution at this time is 0, the new optimal values are H (1,1) and H (2,1),
Figure BDA0002040682770000071
Figure BDA0002040682770000072
in step 107, the relationship between the variation Δ 1 of the telescopic length H1 and the designated threshold a1 and the relationship between the variation Δ 2 of the telescopic length H2 and the designated threshold a2 are determined.
And 108, if the change value delta 1 of the telescopic length H1 is less than or equal to a specified threshold value a1, and the change value delta 2 of the telescopic length H2 is less than or equal to a specified threshold value a2, namely, delta 1 is less than or equal to a1 and delta 2 is less than or equal to a2, the new optimal value H (1, i +1) and the new optimal value H (2, i +1) at the moment are the telescopic values of the sliding partition plate and the sliding sleeve respectively, and the position corresponding to the telescopic value is the optimal position for controlling the movement of the sliding partition plate and the sliding sleeve by the method provided by the application.
In step 109, if the variation Δ 1 of the telescopic length H1 is greater than the specified threshold a1, or the variation Δ 2 of the telescopic length H2 is greater than the specified threshold a2, i.e., Δ 1> a1 or Δ 2> a2, a new optimal value H (1, i +1) is assigned to the previous optimal value H (1, i), and iteration is continued to obtain the new optimal value.
It is worth noting that a1 and a2 in the present application are constants for adjusting the precision setting, and the smaller the value is, the higher the precision of the process for determining the optimal value is, the greater the accuracy is, the more the corresponding execution times are, and generally, the value range of a1 and a2 is 0-1.
And step 110, repeatedly executing the step of keeping the telescopic length H1 of the sliding partition plate to be H (1, i) unchanged, moving the sliding sleeve to enable the telescopic length H2 of the sliding sleeve to be changed from H2max to 0 until the change value of the telescopic length H1 is less than or equal to the designated threshold value a1, and simultaneously the change value of the telescopic length H2 is less than or equal to the designated threshold value a 2.
The application further provides a lime kiln with the spray gun, the spray gun provided by the application is arranged on the side wall of the kiln chamber of the lime kiln, the structure of the spray gun is shown in figure 3, in addition, in order to accelerate the calcination of limestone in the lime kiln, a plurality of spray guns with the same structure can be arranged on the side wall of the kiln chamber, and the feeding amount of fuel coal powder in the lime kiln is increased.
According to the technical scheme, the application provides the spray gun, the spray gun control method and the lime kiln with the spray gun, the vertical pipe 43 is divided into the light fuel area 431 and the thick fuel area 432 by the fixed partition plate 44 arranged in the spray gun, when the pulverized coal passes through the bent pipe 42, the pulverized coal enters the thick fuel area 432 and the light fuel area 431 respectively, and the light fuel area is adjusted by adjusting the telescopic positions of the sliding partition plate 45 and the sliding sleeve 46The concentration difference of the fuel coal dust in the area 431 and the fuel coal dust in the concentrated fuel area 432 naturally forms a primary combustion area with low coal dust concentration and a secondary combustion area with high coal dust concentration at the outlet of a spray gun in the lime kiln, so that NOx formed by combustion in the primary combustion area can be better reduced into N in the secondary combustion area 2 And the content of NOx in the lime production process is reduced.
The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (5)

1. A lance control method for controlling a sliding diaphragm and a sliding sleeve of a lance, the lance comprising: the fuel spray gun comprises a horizontal pipe at an inlet, a bent pipe at the middle section and a vertical pipe at an outlet, wherein the bent pipe is connected with the horizontal pipe and the vertical pipe, a fixed partition plate is arranged in the vertical pipe, a partition plate sliding groove is formed in the fixed partition plate, a sliding partition plate and a partition plate hydraulic cylinder are installed in the partition plate sliding groove, the vertical pipe is divided into two same semi-cylindrical channels by the fixed partition plate, the two semi-cylindrical channels are a light fuel zone and a thick fuel zone respectively, a telescopic sliding partition plate is embedded into one end, close to the bent pipe, of the fixed partition plate, the telescopic length H1 of the sliding partition plate ranges from 0 to H1max, a telescopic sliding sleeve is embedded into one end, close to the outlet of the spray gun, of the thick fuel zone, and the telescopic length H2 of the sliding sleeve ranges from 0 to H2 max; the sliding sleeve (46) is semi-cylindrical, the telescopic length H1 of the sliding partition plate (45) and the telescopic length H2 of the sliding sleeve (46) are moved, and the fuel concentration difference between the light fuel area (431) and the thick fuel area (432) is further controlled
Figure DEST_PATH_IMAGE001
C, the spray gun control method is characterized by comprising the following steps:
determining an optimal value H (1, i) of the telescopic length H1 of the sliding partition plate and an optimal value H (2, i) of the telescopic length H2 of the sliding sleeve;
keeping the telescopic length H1 of the sliding partition board constant at H (1, i), moving the sliding sleeve to change the telescopic length H2 of the sliding sleeve from H2max to 0;
acquiring a telescopic length H2 value corresponding to the minimum concentration of NOx in tail gas in the process that the telescopic length H2 of the sliding sleeve is changed from H2max to 0, wherein the H2 value at the moment is a new optimal value H (2, i + 1);
fixing the telescopic length H2 of the sliding sleeve to be H (2, i +1), and moving the sliding partition plate to change the telescopic length H1 of the sliding partition plate from H1max to 0;
acquiring a telescopic length H1 value corresponding to the minimum NOx concentration in the tail gas in the process that the telescopic length H1 of the sliding partition plate is changed from H1max to 0, wherein the H1 value at the moment is a new optimal value H (1, i + 1);
calculating variation values of the telescopic lengths H1 and H2 based on the new optimum value H (1, i +1) and the previous optimum value H (1, i), and the new optimum value H (2, i +1) and the previous optimum value H (2, i);
if the telescopic length H1 changes
Figure 829290DEST_PATH_IMAGE002
Less than or equal to a prescribed threshold value a1, while the variation value of the telescopic length H2
Figure 34007DEST_PATH_IMAGE003
If the value is less than or equal to the specified threshold value a2, the new optimal value H (1, i +1) and the new optimal value H (2, i +1) at the moment are the expansion and contraction values of the sliding partition plate and the sliding sleeve respectively;
if the telescopic length H1 changes
Figure 639431DEST_PATH_IMAGE002
Greater than a specified threshold a1, or a variation value of the telescopic length H2
Figure 839469DEST_PATH_IMAGE003
Above the specified threshold a2, the new optimum value H (1, i +1) is assigned to the previous optimum value H (1, i);
repeatedly executing the step of keeping the telescopic length H1 of the sliding partition constant to be H (1, i), and moving the sliding sleeve to change the telescopic length H2 of the sliding sleeve from H2max to 0 until the change value of the telescopic length H1 is less than or equal to the specified threshold value a1 and the change value of the telescopic length H2 is less than or equal to the specified threshold value a2, wherein the i is the number of times of repeated execution.
2. The method of claim 1, wherein the initial optimal value of the sliding bulkhead telescoping length H1, H (1, i) = H1max, and the initial optimal value of the sliding sleeve telescoping length H2, H (2, i) = H2 max.
3. The method according to claim 1, wherein the variation value of the telescopic length H1 is calculated according to the following formula
Figure 239357DEST_PATH_IMAGE002
：
Figure 524845DEST_PATH_IMAGE004
。
4. The method according to claim 1, wherein the variation value of the telescopic length H2 is calculated according to the following formula
Figure DEST_PATH_IMAGE005
：
Figure 600205DEST_PATH_IMAGE006
。
5. Lime kiln with a lance, characterized in that a lance is provided on the side wall of the kiln chamber of the lime kiln, said lance being controlled by a lance control method according to any one of claims 1 to 4.
CN201910340954.XA 2019-04-25 2019-04-25 Spray gun, spray gun control method and lime kiln with spray gun Active CN111847909B (en)

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