Cement clinker low nitrogen grading cyclone burner and nox inhibition multi-channel air distribution device

Abstract

The utility model discloses a cement clinker low nitrogen grading cyclone combustor and NOx inhibition multichannel air distribution device, including the bottom plate, the top of bottom plate is installed with mobile part, and the top of mobile part is installed with combustor base and air inlet box respectively, and the air outlet end of air inlet box is connected with the air inlet end of combustor base. The utility model discloses according to the production of cement clinker, control stepper motor rotation fixed angle, T type sealing plate drives air baffle to rotate fixed angle at this moment, make the air intake of air inlet box get control, avoid the nitrogen in excessive air to oxidize and produce more harmful nitrogen oxides (NOx) under high temperature, this not only aggravate environmental pollution, also increased the cost of subsequent denitration processing, further excessive air can reduce furnace temperature and cement clinker quality: the superfluous air absorbs the heat in the stove, leads to the kiln temperature drop, at the same time, the flame is not stable or not concentrated, makes cement clinker intensity low, and influences the service life of refractory brick.

Description

Technical Field

[0001] This utility model relates to the field of cement clinker production technology, specifically to a low-NOx graded cyclone burner for cement clinker and a multi-channel air distribution device for NOx suppression. Background Technology

[0002] Cement clinker is a semi-finished product obtained by mixing limestone, clay, and iron-based raw materials in appropriate proportions to form raw meal, burning it until partially or completely melted, and then cooling it. In the cement industry, the most commonly used silicate cement clinker mainly consists of calcium oxide, silicon dioxide, and small amounts of alumina and iron oxide. Its main mineral components are tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite. Silicate cement clinker is produced by grinding it together with an appropriate amount of gypsum. The production process of cement clinker requires the use of low-NOx staged cyclone burners and NOx-suppressing multi-channel air distribution devices.

[0003] Existing nitrogen-staged cyclone burners and NOx-suppressing multi-channel air distribution devices cannot adjust the air intake. When the air intake is too high, the nitrogen in the air oxidizes at high temperatures, producing more harmful nitrogen oxides (NOx). This not only exacerbates environmental pollution but also increases the cost of subsequent denitrification treatment. To solve these technical problems, we have designed a low-NOx staged cyclone burner for cement clinker and a NOx-suppressing multi-channel air distribution device. Utility Model Content

[0004] The purpose of this invention is to provide a low-NOx graded cyclone burner for cement clinker and a multi-channel air distribution device for NOx suppression, which has the advantage of controlling the air intake. This solves the problem that existing nitrogen graded cyclone burners and multi-channel air distribution devices for NOx suppression cannot adjust the air intake during use. When the air intake is too large, the nitrogen in the air is oxidized at high temperature to produce more harmful nitrogen oxides (NOx), which not only aggravates environmental pollution but also increases the cost of subsequent denitrification treatment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-NOx graded cyclone burner for cement clinker and a multi-channel air distribution device for NOx suppression, comprising a base plate, a movable component installed on the top of the base plate, a burner base and an air inlet box respectively installed on the top of the movable component, the air outlet of the air inlet box being connected to the air inlet of the burner base, a nozzle connected to the left side of the burner base, several V-shaped positioning anchors welded to the outside of the nozzle, a refractory sealing plate connected to the left side of the burner base and the right side of the nozzle, an inner air inlet pipe and an outer air inlet pipe respectively connected to the left side of the front side of the burner base, a control switch box and a display screen respectively installed on the burner base, a transfer box connected to the rear side of the air inlet box, a filling pipe connected to the bottom of the transfer box, a pulverized coal injection pipe connected to the top of the left side of the transfer box, the side of the pulverized coal injection pipe away from the transfer box being connected to the burner base, an adjustment component installed on the left side of the top of the air inlet box, and a filter screen frame installed on the left side of the inner wall of the air inlet box.

[0006] Preferably, the top of the transfer box is connected to an electromagnetic reversing valve, and two central air ducts are installed on the left side of the electromagnetic reversing valve. The side of the central air ducts away from the electromagnetic reversing valve is connected to the burner base.

[0007] Preferably, the adjustment component includes an L-shaped bracket, a stepper motor is connected to the top of the L-shaped bracket, the output end of the stepper motor passes through the L-shaped bracket and is connected to a T-shaped sealing plate, and the bottom of the T-shaped sealing plate extends into the interior of the air inlet box.

[0008] Preferably, a rotating window for use with a T-shaped sealing plate is provided on the left side of the top of the air inlet box, the bottom of the T-shaped sealing plate is connected to a wind plate, a sealing shaft is embedded in the center of the bottom of the wind plate, and a rotating hole for use with the sealing shaft is provided at the bottom of the inner wall of the air inlet box.

[0009] Preferably, the moving component includes two slide rails, which are respectively connected to the front and rear sides of the top of the base plate. A hidden groove is provided on the right side of the top of the base plate. Track boxes are slidably fitted on the outside of the slide rails. The tops of the two track boxes are respectively connected to the burner base and the air inlet box.

[0010] Preferably, both ends of the slide rail are connected to a stop block, the bottom of the stop block is connected to the top of the base plate, a connecting plate is connected between the two track boxes, a connecting strip is connected between the two slide rails, a drive motor is installed at the bottom of the inner wall of the hidden groove, a moving screw is connected to the output end of the drive motor, a support block is movably sleeved on the left side of the moving screw through the connecting strip and the connecting plate and through a bearing, and the bottom of the support block is connected to the top of the base plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, through the combined use of an air inlet box, adjusting components, and a filter frame, has the advantage of controlling the air intake volume. Based on the cement clinker production rate, the stepper motor rotates at a fixed angle, which in turn causes the T-shaped sealing plate to rotate at a fixed angle, thus controlling the air intake volume of the air inlet box. This prevents excessive nitrogen in the air from oxidizing at high temperatures and producing more harmful nitrogen oxides (NOx), which not only exacerbates environmental pollution but also increases the cost of subsequent denitrification treatment. Furthermore, excessive air can lower the furnace temperature and clinker quality: excess air absorbs heat from the furnace, causing a drop in kiln temperature; simultaneously, unstable or unfocused flames result in lower clinker strength and affect the service life of refractory bricks; furthermore, excessive air increases the flue gas volume and velocity, increasing exhaust heat loss; at the same time, it reduces the utilization efficiency of high-temperature secondary air, slowing down the ignition and burnout rate of pulverized coal, ultimately leading to increased coal consumption. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Top view; Figure 3 This is a schematic diagram of the structure of the moving component of this utility model; Figure 4 This is a schematic diagram of the structure of the adjusting component of this utility model; Figure 5 This utility model Figure 4 The left view.

[0013] In the diagram: 1. Moving parts; 101. Slide rail; 102. Track box; 103. Support block; 104. Connecting plate; 105. Moving screw; 106. Connecting strip; 107. Drive motor; 2. Burner base; 3. Base plate; 4. External air inlet pipe; 5. Internal air inlet pipe; 6. Refractory sealing plate; 7. Nozzle; 8. V-shaped positioning anchor; 9. Pulverized coal injection pipe; 10. Control switch box; 11. Display screen; 12. Air inlet box; 13. Adjusting parts; 131. L-shaped bracket; 132. T-shaped sealing plate; 133. Air vane; 134. Sealing shaft; 135. Stepper motor; 14. Central air duct; 15. Electromagnetic reversing valve; 16. Filter screen frame; 17. Transfer box; 18. Filling pipe. Detailed Implementation

[0014] Please see Figures 1-5A low-NOx graded cyclone burner for cement clinker and a multi-channel air distribution device for NOx suppression are disclosed. The burner includes a base plate 3, a movable component 1 mounted on top of the base plate 3, a burner base 2 and an air inlet box 12 mounted on top of the movable component 1, the outlet of the air inlet box 12 connected to the inlet of the burner base 2, a nozzle 7 connected to the left side of the burner base 2, several V-shaped positioning anchors 8 welded to the outside of the nozzle 7, a refractory sealing plate 6 connected to the left side of the burner base 2 and the right side of the nozzle 7, respectively, an inner air inlet pipe 5 and an outer air inlet pipe 4 connected to the left side of the front of the burner base 2, and a control switch box mounted on the burner base 2. 10 and display screen 11, the rear side of the air inlet box 12 is connected to the transfer box 17, the bottom of the transfer box 17 is connected to the filling pipe 18, the top left side of the transfer box 17 is connected to the pulverized coal injection pipe 9, the side of the pulverized coal injection pipe 9 away from the transfer box 17 is connected to the burner base 2, the top left side of the air inlet box 12 is equipped with the adjustment component 13, the left side of the inner wall of the air inlet box 12 is equipped with the filter screen frame 16; the inner air inlet pipe 5 and the outer air inlet pipe 4 are both connected to the external air duct; the inner air inlet pipe 5, the outer air inlet pipe 4 and the filling pipe 18 are all flexible pipes; V-shaped positioning anchor 8, which facilitates the casting of refractory material on the outside of the nozzle 7; the burner base 2 is similar to a fan.

[0015] The top of the transfer box 17 is connected to an electromagnetic reversing valve 15. Two central air ducts 14 are installed on the left side of the electromagnetic reversing valve 15. The side of the central air duct 14 away from the electromagnetic reversing valve 15 is connected to the burner base 2. Through the cooperation of the electromagnetic reversing valve 15 and the central air duct 14, it is convenient to inject air into the burner base 2.

[0016] The adjustment component 13 includes an L-shaped bracket 131, with a stepper motor 135 connected to the top of the L-shaped bracket 131. The output end of the stepper motor 135 passes through the L-shaped bracket 131 and is connected to a T-shaped sealing plate 132. The bottom of the T-shaped sealing plate 132 extends into the interior of the air inlet box 12. The L-shaped bracket 131 facilitates the positioning and installation of the stepper motor 135.

[0017] A rotating window for use with a T-shaped sealing plate 132 is provided on the top left side of the air inlet box 12. A wind plate 133 is connected to the bottom of the T-shaped sealing plate 132. A sealing shaft 134 is embedded in the center of the bottom of the wind plate 133. A rotating hole for use with the sealing shaft 134 is provided at the bottom of the inner wall of the air inlet box 12. The rotating window facilitates the rotation of the T-shaped sealing plate 132. The rotating hole facilitates the rotation of the sealing shaft 134. The inner wall of the rotating window is movably connected to the outer wall of the T-shaped sealing plate 132 through a sealing bearing. The inner wall of the rotating hole is movably connected to the outer wall of the sealing shaft 134 through a sealing bearing.

[0018] The moving part 1 includes two slide rails 101, which are connected to the front and rear sides of the top of the base plate 3 respectively. A hidden groove is provided on the right side of the top of the base plate 3. A track box 102 is slidably fitted on the outside of the slide rails 101. The tops of the two track boxes 102 are connected to the burner base 2 and the air inlet box 12 respectively. The drive motor 107 can be hidden and stored through the hidden groove.

[0019] Both ends of the slide rail 101 are connected to stop blocks, the bottom of the stop blocks are connected to the top of the base plate 3, a connecting plate 104 is connected between the two track boxes 102, a connecting strip 106 is connected between the two slide rails 101, a drive motor 107 is installed at the bottom of the inner wall of the hidden groove, and a moving screw 105 is connected to the output end of the drive motor 107. The left side of the moving screw 105 passes through the connecting strip 106 and the connecting plate 104 and is movably fitted with a support block 103 through a bearing. The bottom of the support block 103 is connected to the top of the base plate 3. The stop blocks can limit the movement of the track box 102, and the support block 103 can support the moving screw 105, facilitating the rotation of the moving screw 105. The inner wall of the connecting strip 106 and the outer side of the moving screw 105 are movably connected through a bearing. The inner wall of the connecting plate 104 and the outer side of the moving screw 105 are connected through a thread.

[0020] In use, a V-shaped positioning anchor 8 is welded to the outside of the nozzle 7, and then refractory material is poured onto the outside of the nozzle 7 to protect it. Both the inner air inlet pipe 5 and the outer air inlet pipe 4 are connected to external air ducts. The filling pipe 18 is connected to the external pulverized coal conveying pipe. The drive motor 107 is rotated forward using the control switch box 10, causing the connecting plate 104 to move to the left outside the moving screw 105, thus moving the burner base 2 and the nozzle 7 to the left, allowing the nozzle 7 to enter the combustion chamber, avoiding the waste of manpower caused by manual movement. The burner base 2 is opened using the control switch box 10, allowing external air to flow into the air inlet box 12 through the filter frame 16, and then into the burner base 2, where it is sprayed out and burned together with the pulverized coal injected from the pulverized coal injection pipe 9. Based on the cement clinker production output, the stepper motor 135 is rotated at a fixed angle. At this time, the T-shaped sealing plate 132 drives the air plate 133 to rotate at a fixed angle, thereby controlling the air intake of the air inlet box 12. This prevents nitrogen in the excessive air from oxidizing at high temperatures and producing more harmful nitrogen oxides (NOx), which not only exacerbates environmental pollution but also increases the cost of subsequent denitrification treatment. Furthermore, excessive air will also reduce the furnace temperature and clinker quality: excess air absorbs heat from the furnace, causing the kiln temperature to drop; at the same time, the flame is unstable or not concentrated, resulting in lower clinker strength and affecting the service life of refractory bricks; furthermore, excessive air increases the flue gas volume and velocity, increasing exhaust heat loss; at the same time, it reduces the utilization efficiency of high-temperature secondary air, slows down the ignition and combustion rate of pulverized coal, and ultimately leads to increased coal consumption.

[0021] In summary, this low-NOx graded cyclone burner for cement clinker, combined with the NOx suppression multi-channel air distribution device, solves the problem that existing nitrogen graded cyclone burners and NOx suppression multi-channel air distribution devices cannot adjust the air intake volume during use. When the air intake volume is too high, the nitrogen in the air oxidizes at high temperatures, producing more harmful nitrogen oxides (NOx), which not only aggravates environmental pollution but also increases the cost of subsequent denitrification treatment.

Claims

1. A low-NOx staged cyclone burner for cement clinker and a multi-channel air distribution device for NOx suppression, comprising a base plate (3), characterized in that: A movable component (1) is installed on the top of the base plate (3). A burner base (2) and an air inlet box (12) are respectively installed on the top of the movable component (1). The air outlet of the air inlet box (12) is connected to the air inlet of the burner base (2). A nozzle (7) is connected to the left side of the burner base (2). Several V-shaped positioning anchors (8) are welded to the outside of the nozzle (7). A fire-resistant sealing plate (6) is connected to the left side of the burner base (2) and the right side of the nozzle (7). An internal air inlet pipe (5) and an internal air inlet pipe (5) are respectively connected to the left side of the front of the burner base (2). An external air inlet pipe (4) and a control switch box (10) and a display screen (11) are respectively installed on the burner base (2). A transfer box (17) is connected to the rear side of the air inlet box (12). A filling pipe (18) is connected to the bottom of the transfer box (17). A pulverized coal injection pipe (9) is connected to the top left side of the transfer box (17). The side of the pulverized coal injection pipe (9) away from the transfer box (17) is connected to the burner base (2). An adjustment component (13) is installed on the left side of the top of the air inlet box (12). A filter screen frame (16) is installed on the left side of the inner wall of the air inlet box (12).

2. The low-NOx staged cyclone burner for cement clinker and the multi-channel air distribution device for NOx suppression according to claim 1, characterized in that: The top of the transfer box (17) is connected to an electromagnetic reversing valve (15). Two central air ducts (14) are installed on the left side of the electromagnetic reversing valve (15). The side of the central air duct (14) away from the electromagnetic reversing valve (15) is connected to the burner base (2).

3. The low-NOx staged cyclone burner for cement clinker and the multi-channel air distribution device for NOx suppression according to claim 1, characterized in that: The adjustment component (13) includes an L-shaped bracket (131), the top of which is connected to a stepper motor (135). The output end of the stepper motor (135) passes through the L-shaped bracket (131) and is connected to a T-shaped sealing plate (132). The bottom of the T-shaped sealing plate (132) extends into the interior of the air inlet box (12).

4. The low-NOx staged cyclone burner for cement clinker and the multi-channel air distribution device for NOx suppression according to claim 3, characterized in that: The top left side of the air inlet box (12) is provided with a rotating window that works in conjunction with the T-shaped sealing plate (132). The bottom of the T-shaped sealing plate (132) is connected to a wind plate (133). A sealing shaft (134) is embedded in the center of the bottom of the wind plate (133). The bottom of the inner wall of the air inlet box (12) is provided with a rotating hole that works in conjunction with the sealing shaft (134).

5. The low-NOx staged cyclone burner for cement clinker and the multi-channel air distribution device for NOx suppression according to claim 1, characterized in that: The moving part (1) includes two slide rails (101), which are connected to the front and rear sides of the top of the base plate (3) respectively. A hidden groove is provided on the right side of the top of the base plate (3). The slide rails (101) are slidably fitted with track boxes (102). The tops of the two track boxes (102) are connected to the burner base (2) and the air inlet box (12) respectively.

6. The low-NOx staged cyclone burner for cement clinker and the multi-channel air distribution device for NOx suppression according to claim 5, characterized in that: Both ends of the slide rail (101) are connected to a stop block. The bottom of the stop block is connected to the top of the base plate (3). A connecting plate (104) is connected between the two track boxes (102). A connecting strip (106) is connected between the two slide rails (101). A drive motor (107) is installed at the bottom of the inner wall of the hidden groove. A moving screw (105) is connected to the output end of the drive motor (107). The left side of the moving screw (105) passes through the connecting strip (106) and the connecting plate (104) and is movably sleeved with a support block (103) through a bearing. The bottom of the support block (103) is connected to the top of the base plate (3).

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