JP2019163880A - Burner device for cement kiln and operation method of the same - Google Patents

Abstract

To provide a burner device for a cement kiln which strongly forms a floating state of a combustible solid refuse in the cement kiln, and facilitates ignition of the combustible solid refuse in the floating state, and an operation method of the burner device for a cement kiln.SOLUTION: There is provided the burner device for a cement kiln comprising a plurality of flow passages which are partitioned by a plurality of coaxial cylindrical members, the burner device comprises: a solid powder fuel flow passage comprising swiveling means for solid powder fuel flow; a first air flow passage formed outside the solid powder fuel flow passage while adjoining it, and having the swiveling means for an airflow; a second air flow passage formed outside the first air flow passage while adjoining it, and having linear progressing means for the airflow; a third air flow passage formed outside the second air flow passage while adjoining it and having linear progressing means for the airflow; a fourth air flow passage formed inside the solid powder fuel flow passage while adjoining it, and having the swiveling means for the airflow; and a combustible solid refuse flow passage formed inside the fourth air flow passage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a burner device for a cement kiln, and more particularly to a burner device for a cement kiln that uses combustible solid waste as an auxiliary fuel in cement clinker firing. The present invention also relates to a method for operating such a cement kiln burner apparatus.

  Combustible solid waste such as waste plastic, wood waste, and automobile shredder residue (ASR) has a heat quantity that can be used as a fuel for firing. Therefore, in a rotary kiln used for firing cement clinker, effective use of combustible solid waste is promoted as an alternative fuel for pulverized coal, which is the main fuel. Hereinafter, the rotary kiln used for firing the cement clinker is referred to as “cement kiln”.

  Conventionally, fuel recycling of combustible solid waste in a cement kiln has been promoted in a calcining furnace installed at the bottom of the kiln, which has little impact on the quality of the cement clinker. However, since the amount used in the calcining furnace has approached saturation, there is a need for a technique for using the main burner installed in the front of the kiln.

  However, when combustible solid waste is used as an alternative fuel in the main burner of a cement kiln, combustion continues even if the combustible solid waste ejected from the main burner lands on the cement clinker in the cement kiln. A phenomenon (hereinafter referred to as “landing combustion”) may occur. When such landing combustion occurs, the cement clinker around the landing point of the flammable solid waste is reduced and fired, resulting in whitening of the cement clinker and abnormal clinkering reaction.

  In order to prevent the flammable solid waste from landing and burning, the floating state of the flammable solid waste in the cement kiln is continued for a long time and the combustion of the flammable solid waste is completed in the floating state, There is a need for a technique for landing a combustible solid waste in a cement kiln and completing the combustion of the combustible solid waste before the clinker raw material reaches the main reaction zone of the clinker ring.

  For example, in the following Patent Document 1, as a technology capable of burning most of the combustible solid waste in a floating state, a main fuel burner and a combustible solid waste for injecting pulverized coal as a main fuel are disclosed. In a cement kiln provided with an auxiliary burner to be blown in, primary air from the main fuel burner is supplied so as to swivel in one direction as viewed from the axial direction from the front side of the kiln main body, and outside the main fuel burner. A cement kiln in which an auxiliary burner is disposed in a range from the top (0 °) of the main fuel burner to the vertical line passing through the axis up to 55 ° in the opposite direction to the one direction is disclosed. Has been.

JP2013-237571A

  However, in the method of Patent Document 1, the effect of making the combustible solid waste in a floating state is not sufficient, and the applicable combustible solid waste is limited to a material having a small bulk specific gravity such as waste plastic. Moreover, even if it is a waste plastic, it has the subject that it is difficult to completely burn a thing with an outer diameter exceeding 15 mm in a floating state. That is, the combustible solid waste that can be used in the method of Patent Document 1 has a large limitation in terms of bulk specific gravity and size.

  In view of the above problems, the present invention strongly forms a floating state of flammable solid waste in a cement kiln, and at the same time, a burner device for a cement kiln that easily causes ignition of flammable solid waste in a floating state, and It aims at providing the driving method.

  The inventors of the present invention strongly form the floating state of the combustible solid waste in the cement kiln, and at the same time, the combustible solid waste from the main burner that is liable to ignite the floating combustible solid waste. As a result of intensive studies on the blowing method, the outlet from the main burner is a 5-channel burner having four primary air flow paths in addition to one fuel flow (air flow containing pulverized coal). It has been found that the above problems can be solved.

That is, the cement kiln burner device according to the present invention is
A burner device for cement kiln comprising a plurality of flow paths partitioned by a plurality of concentric cylindrical members,
A solid powder fuel flow path comprising swirling means for the solid powder fuel flow;
A first air flow path (first swirling external flow) disposed outside and adjacent to the solid powder fuel flow path and provided with air flow swirling means;
A second air flow path (first straight forward flow) disposed outside and adjacent to the first air flow path and provided with straight air flow means;
A third air flow path (second rectilinear outward flow) disposed outside and adjacent to the second air flow path and provided with a straight air flow means;
A fourth air flow path (first swirling internal flow) disposed inside and adjacent to the solid powder fuel flow path and provided with swirling means for air flow;
A combustible solid waste channel is provided inside the fourth air channel.

  Each of the solid powder fuel flow path, the first air flow path, the second air flow path, the third air flow path, the fourth air flow path, and the flammable solid waste flow path, It extends to the tip of the cement kiln burner device.

  That is, the cement kiln burner device having the above configuration has three air flow paths (a first swirling external flow, a first straight forward outward flow, and a second straight forward external flow) on the outside, and one on the inner side across the solid powder fuel flow path. An air flow path (first swirl internal flow) is provided. By independently adjusting the amount of air flowing through these four air flow paths, it is easy to make adjustments to obtain the optimum flame according to the type of solid powder fuel and combustible solid waste used. be able to.

  Preferably, the third air flow path includes an axial center of the corresponding concentric cylindrical member and jets an air flow only from a vertically lower side than a plane parallel to the axial direction of the concentric cylindrical member. is there. More preferably, the third air flow path is configured to eject an air flow from a region formed in a U shape when viewed in the axial direction of the corresponding concentric cylindrical member.

  According to this configuration, from the third air flow path (second rectilinear outward flow) arranged in a U-shape (for example, a semicircular shape) at a vertically lower position on the outermost side of the four air flow paths. Ascending airflow is formed in the burner flame by the straight outward flow of the U-shaped (e.g., semicircular) primary air to be ejected, and even in the case of large flammable solid waste, the floating state can be maintained for a long time.

  Preferably, the cement kiln burner device includes a straight traveling means in the combustible solid waste stream ejected from the combustible solid waste flow path.

  According to such a configuration, the combustible solid waste stream can be sufficiently mixed with the primary air ejected from each flow path, and further with the secondary air that is high-temperature air supplied from the clinker cooler into the cement kiln. It becomes possible. Thereby, combustion of combustible solid waste can be completed early by supplying a sufficient amount of oxygen to the vicinity where the combustible solid waste floats, and promptly creating a high temperature environment.

  In the cement kiln burner device, the swirl angle of the solid powder fuel flow at the burner tip from the solid powder fuel flow path can be 3 ° to 15 °. Further, the swirl angle of the air flow at the burner tip from the first air flow path and the swirl angle of the air flow at the burner tip from the fourth air flow path may be 30 ° to 50 °, respectively. it can.

Further, the present invention is an operation method of the cement kiln burner device, wherein the wind speed at the tip of the burner in the third air flow path (second straight forward flow) is 130 m / second to 260 m / second, air volume from the third air flow path (primary air amount), characterized in that it is a 50 m ³ N / min ~100m ³ N / min.

In the method for operating the cement kiln burner device, the wind speed at the tip of the burner in the first air flow path (first swirling external flow) is set to 90 m / sec to 150 m / sec, and the air volume from the first air flow path ( the primary air amount) may be 10 m ³ N / min ~40m ³ N / min. In addition, the wind speed at the burner tip in the fourth air flow path (first swirling internal flow) is 80 m / sec to 160 m / sec, and the air volume (primary air volume) from the fourth air flow path is 10 m. ³ N / min to 40 m ³ N / min may be used. Further, the wind speed of the solid powder fuel flow at the burner tip of the solid powder fuel flow path and the wind speed of the solid powder fuel flow at the burner tip of the combustible solid waste flow path are both set to 30 m / second to 70 m / second. It doesn't matter.

In the operation method of the cement kiln burner device, the burner tip wind speed (m / sec) and the primary air amount (m ³ N / min) of the air flow at the tip of the third air flow path (second straight forward flow) )) Product may be larger than the product of the burner tip wind velocity (m / sec) and the primary air amount (m ³ N / min)) of the air flow at the tip of the burner of the other air flow path. .

  Moreover, in the operation method of the burner device for cement kiln, the particle size of the combustible solid waste ejected from the combustible solid waste flow path can be 30 mm or less.

  According to the burner device for cement kiln of the present invention and the operation method of the burner device for cement kiln of the present invention, combustible solid waste such as waste plastic pieces can be effectively used as an alternative fuel without landing and burning. it can.

It is drawing which shows typically one Embodiment of the front-end | tip part of the burner apparatus for cement kilns of this invention. It is drawing which shows typically an example of the structure of the burner system for cement kilns containing the burner apparatus for cement kilns shown in FIG. It is typical drawing for demonstrating the turning angle of the turning blade | wing of the burner apparatus for cement kilns of FIG. It is a graph which shows the combustion simulation result which concerns on the ratio (fall rate in a kiln) which combustible solid waste makes the landing fuel by the operating method of the burner apparatus for cement kilns and the burner apparatus for cement kilns of this invention.

  Hereinafter, embodiments of a burner device for a cement kiln and an operation method thereof according to the present invention will be described with reference to the drawings. The following drawings are schematically shown, and the dimensional ratio on the drawings does not match the actual dimensional ratio.

  FIG. 1 is a drawing schematically showing a tip portion of one embodiment of a cement kiln burner device of the present invention. In FIG. 1, (a) is a transverse sectional view of the burner device, and (b) is a longitudinal sectional view thereof. The cross-sectional view refers to a cross-sectional view of the cement kiln burner device cut along a plane orthogonal to the axial direction of the device, and the longitudinal cross-sectional view refers to the cement kiln burner device in the axial direction of the device. Sectional drawing cut | disconnected by the plane parallel to is pointed out.

  In FIG. 1, the coordinate system is set with the axial direction (ie, air flow direction) of the cement kiln burner device as the Y direction, the vertical direction as the Z direction, and the direction orthogonal to the YZ plane as the X direction. Yes. Below, it demonstrates suitably using this XYZ coordinate system.

  As shown in FIG. 1, the cement kiln burner device 1 includes a plurality of concentric flow paths, and is disposed outside the solid powder fuel flow path 2 and the solid powder fuel flow path 2. The first air flow path 11, the second air flow path 12 arranged outside adjacent to the first air flow path 11, and the outermost arrangement adjacent to the second air flow path 12 The third air flow path 13 and the fourth air flow path 14 disposed inside and adjacent to the solid powder fuel flow path 2 are provided in total. Inside the fourth air passage 14, an oil passage 7, a combustible solid waste passage 8, and the like are arranged.

  In the present embodiment, the third air flow path 13 includes a shaft of the corresponding cylindrical member and is vertically lower than a plane parallel to the axial direction of the concentric cylindrical member (Z1-Z1 plane in FIG. 1). It is a jet outlet which ejects an airflow only from the side (-Z direction side).

  Of the solid powder fuel flow path 2 and the first to fourth air flow paths 11 to 14, the solid powder fuel flow path 2, the first air flow path 11, and the fourth air flow path 14 include: Revolving blades (2a, 11a, 14a) as revolving means are fixed to the burner tip of each flow path. That is, the air flow sprayed from the first air flow path 11 is a swirling air flow positioned outside the solid powder fuel flow sprayed from the solid powder fuel flow path 2 (hereinafter referred to as “first flow as appropriate”). "Swirling outside flow"). The air flow sprayed from the fourth air flow path 14 is a swirling air flow positioned on the inner side of the solid powder fuel flow sprayed from the solid powder fuel flow path 2 (hereinafter referred to as “the first swirl inside appropriately”). "Flow"). In addition, each turning blade | wing (2a, 11a, 14a) is comprised so that a turning angle can be adjusted before the operation | movement start of the burner apparatus 1 for cement kilns.

  On the other hand, the second air flow path 12 and the third air flow path 13 are not provided with a turning means. That is, the air flow sprayed from the second air flow channel 12 is a straight air flow (hereinafter referred to as “first flow” as appropriate) positioned outside the solid powder fuel flow sprayed from the solid powder fuel flow channel 2. Similarly, the air flow sprayed from the third air flow path 13 is a straight air flow located outside the solid powder fuel flow (hereinafter referred to as “second flow” as appropriate). Straight outward flow)).

  FIG. 2 is a drawing schematically showing an example of the structure of a cement kiln burner system including the cement kiln burner device 1 shown in FIG. 1. The cement kiln burner system 20 illustrated in FIG. 2 is configured with emphasis on ease of control, and includes five blower fans F1 to F5.

  The pulverized coal C supplied to the pulverized coal conveyance pipe 22 is supplied to the solid powder fuel flow path 2 by the air flow formed by the blower fan F1. The air supplied from the blower fan F2 is the combustion air A, and the first air flow path 11 and the fourth air flow path 14 of the cement kiln burner device 1 through the air pipes (30, 31, 34). Supplied to. The air supplied from the blower fan F3 is supplied as combustion air A to the second air flow path 12 of the cement kiln burner device 1 via the air pipe 32. The air from the blower fan F4 is supplied as combustion air A to the third air flow path 13 of the cement kiln burner device 1 via the air pipe 33. And the combustible solid waste RF supplied to the combustible solid waste conveyance piping 28 is supplied to the combustible solid waste flow path 8 by the air flow formed by the blower fan F5.

  The cement kiln burner system 20 illustrated in FIG. 2 includes variable dampers (B1, B2) for controlling the amount of air flowing through the air pipes (31, 34), respectively. The amount of air flowing through each flow path (2, 8, 11, 12, 13, 14) is independently controlled by the blower fans (F1 to F5) and these variable bumpers (B1, B2). Can do. This makes it suitable for the types of pulverized coal, petroleum coke or other solid powder fuels such as solid fuel, the types of combustible solid waste such as waste plastic, meat and bone powder or biomass, and the operating environment of various cement kilns. Can be easily adjusted to obtain a proper flame.

  In this specification, “biomass” is a biological organic resource (excluding fossil fuels) that can be used as fuel, for example, waste crushed pulverized material, construction waste pulverized material. , Wood flour and sawdust.

  Further, heavy oil or the like is supplied from the oil flow path 7 to be used when the cement kiln burner device 1 is ignited, and further, a solid fuel other than pulverized coal or liquid fuel such as heavy oil is supplied to perform steady operation. It can also be mixed with pulverized coal (not shown).

  That is, the burner device 1 (and system 20) for cement kiln of the present invention whose one embodiment is shown in FIGS. 1 and 2 includes four air flow paths (11, 12, 13) in addition to the solid powder fuel flow path 2. 14), and when the cement kiln burner device 1 is used, the five air supply fans F1 to F5 are operated to control the two variable dampers B1 and B2. The amount of air flowing through each flow path (2, 8, 11, 12, 13, 14) is configured to be controllable. In addition to this, before using the cement kiln burner device 1, swirl vanes (provided in the solid powder fuel flow path 2, the first air flow path 11, and the fourth air flow path 14 ( Since the turning angles 2a, 11a, and 14a) can be adjusted, various controls can be performed as necessary.

By the combustion simulation of the burner device 1 for cement kiln (software: manufactured by ANSYS JAPAN, FLUENT), the present inventors have determined the degree of formation of the updraft in the flame, the degree of the intake of secondary air into the burner flame, Fundamental for optimizing the control factors by analyzing the flame shape, temperature distribution in the cement kiln, and cement kiln operation data (NO _x concentration, O ₂ concentration, kiln bottom temperature, etc. in kiln bottom) A limited area was found.

Table 1 below is an example of a basic limited region found under the following burner combustion conditions.
<Burner combustion conditions>
Combustion amount of pulverized coal C: 15 t / hour Waste plastic (soft plastic) treatment amount as combustible solid waste RF: 1.5 t / hour Dimensions of waste plastic as combustible solid waste RF: φ20 mm × T0.13 mm Circular sheet shape Secondary air volume and temperature: 144000 Nm ³ / hour, 750 ° C.
Theoretical combustion air volume Primary air ratio (A0 ratio) sum: 11% by volume
Diameter of burner tip of cement kiln burner device 1: 650 mm

In Table 1, as the basic limited region, the solid powder fuel flow path 2, the first air flow path 11 (forming the first swirling external flow), the second (forming the first straight forward flow) Air flow path 12, a third air flow path 13 (forming a second straight forward flow), a fourth air flow path 14 (forming a first swirling internal flow), and a combustible solid waste flow path 8, the wind speed at the tip of the burner (m / sec), the primary air amount (m ³ N / min), and the swirl angles of the swirl vanes (2a, 11a, 14a) are listed.

Among the above items, the burner tip wind speed (m / sec) and the primary air amount (m ³ N / min) of the second straight outward flow are particularly important. This is because, as described above, the third air flow path 13 is a spout that ejects an air flow only from the vertically lower side than the central position in the vertical direction of the concentric cylindrical member. This is because the air flow (second straight traveling outward flow) ejected from the passage 13 forms an upward flow, and the floating state of the combustible solid waste RF is maintained. In addition, this is because the secondary air, which is a high-temperature gas, is taken into the flame by the upward flow caused by the second straight outward flow, and the temperature rise of the combustible solid waste RF is accelerated. However, if the upward flow due to the second straight outward flow becomes excessive, the burner flame may be shortened, so that combustion of the combustible solid waste RF may not be completed in the floating state.

In view of such circumstances, the burner tip wind speed of the air flow (second straight traveling outward flow) supplied from the third air flow path 13 is preferably 130 m / sec to 260 m / sec. This air stream is the highest wind speed among solid powder fuel streams, combustible solid waste streams, and all other primary air streams. Further, the primary air amount (m ³ N / min) of the second straight forward flow is the product of this value and the burner tip wind velocity (m / sec) (burner tip wind velocity (m / sec) × primary air amount (m ³ N / Min)) is the largest amount of air in the solid powder fuel stream, the combustible solid waste stream, and all other primary air streams.

In the air flow supplied from the third air flow path 13, when the value of the product, that is, the value of the burner tip wind speed (m / sec) × primary air amount (m ³ N / min) is small, the rise in the flame Insufficient flow formation may occur. In addition, in the air flow where the burner tip wind speed exceeds 260 (m / sec), the formation of the upward flow in the flame becomes excessive, and the burner flame may be shortened.

  Next, the basic limited areas that are important are the above-described solid powder fuel flow path 2, the first air flow path 11 (forming the first swirling outer flow), and (forming the first swirling inner flow). This is the turning angle (°) of the fourth air flow path 14. The reason is that the swirl flow generated by the swirl vanes (2a, 11a, 14a) forms the internal circulation that provides the ignition stability and flame holding function of the burner device. Furthermore, the swirl angle of the swirl vanes (2a, 11a, 14a) is usually fixed during operation of the burner device, and optimization adjustment cannot be performed during operation.

  Note that the swirl angle of the swirl vane means, for example, the axis 9 of the cement kiln burner device 1 when the cylindrical member to which the swirl vane shown in FIG. 1 is fixed is developed on a plane as shown in FIG. And the angle θ formed by the center line 10 of the swirl vane, which coincides with the swirl angle of the solid powder fuel flow or the primary air flow at the burner tip. FIG. 3 exemplarily shows the swirl vane 2a of the solid powder fuel flow path 2. The pulverized coal C (solid powder fuel) ejection direction at the tip position 2b of the solid powder fuel flow path 2 is as follows. It is turned by an angle θ with respect to the direction of the axis 9 of the cylindrical member (Y direction in the drawing). The swivel angles in the other swirl vanes (11a, 14a) are similarly defined.

  The swirl angle of the solid powder fuel flow by the swirl vanes 2a of the solid powder fuel flow path 2 is preferably set to 3 ° to 15 °. When this turning angle is less than 3 °, the solid powder fuel (pulverized coal C) ejected from the solid powder fuel flow path 2, the solid powder fuel flow path 2, the air flow paths (11 to 14), and the flame Insufficient mixing with the secondary air taken in, the temperature of the flame formed by the solid powder fuel decreases and the flame becomes excessively long, and the quality of the resulting cement clinker decreases. There is a fear.

  In addition, when the swirl angle of the solid powder fuel flow exceeds 15 °, the mixing with the other air flow becomes too intense, it becomes difficult to control the shape of the flame, and the quality of the resulting cement clinker is deteriorated. There is a fear.

The swirl angle of the first swirl outer flow (air flow from the first air flow path 11) by the swirl vane 11a, and the first swirl inner flow (air flow from the fourth air flow path 14) by the swirl vane 14a. ) Are preferably set to 30 ° to 50 °, respectively. When these swirl angles are less than 30 °, mixing of the solid powder fuel ejected from the solid powder fuel flow path 2 with the first swirling outer flow and / or the first swirling inner flow is insufficient and obtained. it may be difficult to sufficiently lower the NO _x in the exhaust gas with the quality of the cement clinker is reduced. On the other hand, if the swirl angle exceeds 50 °, mixing with the solid powder fuel flow becomes too intense, making it difficult to control the shape of the flame, and the quality of the resulting cement clinker may be degraded. .

The primary air amount (m ³ N / min) of each flow path (2, 8, 11, 12, 13, 14) is reduced as much as possible from the viewpoint of stably forming a reduction region in the flame. However, if the amount is excessively reduced, the shape of the flame changes and the high temperature region moves into the cement kiln, so that the quality of the obtained cement clinker is deteriorated. In the example shown in Table 1 above, the air flow from the solid powder fuel flow path 2, the first straight outward flow (air flow from the second air flow path 12), and the second straight forward flow (third The amount (primary air amount) of the air flow from the air flow path 13 is set larger than the other air flows. This is because the hot secondary air is smoothly taken into the flame, and the solid powder fuel C and the combustible solid waste RF are rapidly heated to promote the release of volatile matter and stabilize the reduced state of the flame. This is because of

  As described above, according to the present invention, before the operation of the cement kiln burner device 1, the solid powder fuel flow path 2, the first air flow path 11 (first swirling external flow), and the fourth air The swirl angle of each swirl vane (2a, 11a, 14a) of the flow path 14 (first swirl inner flow) is set within the range shown in Table 1, and further, during operation of the cement kiln burner device 1, The primary air amount flowing through the air pipes (22, 30) by the air fans (F1, F2) and the primary air amount flowing through the air pipes (31, 34) by the variable dampers (B1, B2) are adjusted, respectively. By setting the burner tip wind speed and primary air volume of the flow path (2, 11, 12, 13, 14) within the ranges shown in Table 1, the operating conditions of the cement kiln burner device 1 are optimized in a short period of time. can do.

  Next, combustible solid waste RF (in this case, soft plastic) when the burner tip wind speed (m / sec) of the second straight outward flow (air flow from the third air flow path 13) is changed is A combustion simulation relating to the rate of landing combustion (falling rate in the kiln) will be described.

  Specifically, when the following burner combustion conditions are fixed and the burner tip wind speed (m / sec) of the second straight forward flow is changed, the burnout of the soft plastic having various sizes is caused by the flame. It was verified by simulation (software: manufactured by ANSYS JAPAN, FLUENT) whether it occurred in the inside or the inner wall of the kiln.

<Burner combustion conditions>
Combustion amount of pulverized coal C: 15 t / hour Waste plastic (soft plastic) treatment amount as combustible solid waste RF: 1.5 t / hour Dimension of waste plastic as combustible solid waste RF: Thickness 0.13 mm Circular sheet-shaped sheet punched into a diameter of 15, 20, 25, 30 mm Burner tip wind speed and primary air volume of solid powder fuel flow: 40 m / sec, 75 m ³ N / min Burner tip wind speed and primary flow of first swirling outflow Air volume: 120 m / sec, 25 m ³ N / min First straight forward flow burner tip wind speed and primary air volume: 140 m / sec, 95 m ³ N / min First swirl inner stream burner tip wind speed and primary air volume: 120 m / sec, 25 m ³ burner tip velocity of N / min flammable solid waste stream and the primary air quantity (m ³ N / min): 40 m / sec, 75 m ³ N / min secondary air quantity and temperature: 144000Nm ³ / time 750 ℃
Theoretical combustion air volume Primary air ratio (A0 ratio) sum: 11% by volume
Diameter of burner tip of cement kiln burner device 1: 650 mm

  The simulation results are shown in Table 2 below and FIG. In addition, when the wind speed at the tip of the burner tip of the second straight forward flow exceeded 300 (m / sec), the flame shape became unstable and the simulation result could not be obtained.

  According to the results of Table 2 and FIG. 4, according to the cement kiln burner device and the operation method of the cement kiln burner device of the present invention, the combustible solid waste RF having a particle size of up to 30 mm is landed and burned. It is confirmed that it can be effectively burned out in the burner flame.

[Another embodiment]
In the example of FIG. 2, a case where the cement kiln burner system 20 includes five blowing fans (F1 to F5) and two variable bumpers (B1, B2) is illustrated, but this aspect is an example. Therefore, the present invention is not intended to be limited to such a configuration. For example, in the example of FIG. 2, the combustion air A to be supplied to the first air flow path 11 and the combustion air A to be supplied to the fourth air flow path 14 are the same blower fan F2. However, it is also possible for these to be air streams supplied from separate blower fans. On the contrary, the blower fans (F3 and F4) for guiding the air flow to the second air flow path 12 and the third air flow path 13 may be shared.

1: Burner device for cement kiln 2: Flow path for solid powder fuel 2a: Swirling blade provided in the flow path for solid powder fuel 2b: Position of the tip of the flow path for solid powder fuel 7: Flow path for oil 8: Flammability Solid waste flow path 9: Axis 11: First air flow path 11a: Swivel blades provided in the first air flow path 12: Second air flow path 13: Third air flow path 14: First Four air flow paths 14a: Swivel vanes provided in the fourth air flow path 20: Burner system for cement kiln 22: Pulverized coal transfer pipe 28: Flammable solid waste transfer pipe 30, 31, 32, 33, 34 : Air piping A: Combustion air C: Pulverized coal F1, F2, F3, F4, F5: Blower fan RF: Combustible solid waste

Claims (11)

A burner device for cement kiln comprising a plurality of flow paths partitioned by a plurality of concentric cylindrical members,
A solid powder fuel flow path comprising swirling means for the solid powder fuel flow;
A first air flow path disposed outside and adjacent to the solid powder fuel flow path and provided with a swirling means for air flow;
A second air flow path disposed on the outside adjacent to the first air flow path and provided with straight air flow means;
A third air flow path disposed outside and adjacent to the second air flow path, and comprising straight air flow means;
A fourth air flow path disposed inside and adjacent to the solid powder fuel flow path, and provided with air flow swirling means;
A burner device for a cement kiln, comprising a combustible solid waste channel disposed inside the fourth air channel.   The third air flow path includes an axial center of the corresponding concentric cylindrical member and ejects an air flow only from a vertically lower side than a plane parallel to the axial direction of the concentric cylindrical member. The burner device for a cement kiln according to claim 1.   3. The cement kiln according to claim 2, wherein the third air flow channel ejects an air flow from a region formed in a U shape when viewed from an axial direction of the corresponding concentric cylindrical member. Burner equipment.   The cement kiln according to any one of claims 1 to 3, wherein a swirl angle of the solid powder fuel flow at a burner tip from the solid powder fuel flow path is 3 ° to 15 °. Burner device.   The swirl angle of the air flow at the burner tip from the first air flow path and the swirl angle of the air flow at the burner tip from the fourth air flow path are 30 ° to 50 °. The burner device for a cement kiln according to any one of claims 1 to 4. A method for operating the burner device for a cement kiln according to any one of claims 1 to 5,
The wind speed at the burner tip in the third air flow path is 130 m / sec to 260 m / sec,
The air volume from the third air flow path, 50 m ³ N / min ～100M ^3, characterized in that a N / min, operating method of the cement kiln burner device. The wind speed at the burner tip in the first air flow path is 90 m / sec to 150 m / sec,
The volume of air from the first air passage, 10 m ³ N / min ～40M ^3, characterized in that a N / min, operating method of the cement kiln burner apparatus of claim 6. The wind speed at the burner tip in the fourth air flow path is 80 m / sec to 160 m / sec,
The air volume from the fourth air flow path, 10 m ³ N / min ～40M ^3, characterized in that a N / min, operating method of the cement kiln burner device according to claim 6 or 7.   The wind speed of the solid powder fuel flow at the burner tip of the solid powder fuel flow path and the wind speed of the solid powder fuel flow at the burner tip of the combustible solid waste flow path are both 30 m / sec to 70 m / sec. The operation method of the burner device for a cement kiln according to any one of claims 6 to 8, wherein The product of the burner tip wind velocity (m / sec) and the primary air amount (m ³ N / min) of the air flow at the burner tip of the ^third air channel is the air at the burner tip of the other air channel. It is larger than the product of the burner tip velocity of flow (m / s) and the primary air quantity (m ³ N / min)), cement kiln burner according to any one of claims 6-9 How to operate the device.   The burner for a cement kiln according to any one of claims 6 to 10, wherein a particle size of the combustible solid waste ejected from the combustible solid waste flow path is 30 mm or less. How to operate the device.

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