Ammonia water atomization device for cement kiln

Abstract

The utility model relates to the field of cement production, in particular to an ammonia water atomization device for a cement kiln, and aims to solve the technical problems that in the prior art, direct spraying is carried out in a cement rotary kiln, so that a spraying device is easily blocked, and the maintenance and replacement procedures are tedious. A fixed sleeve is rotationally connected into the annular groove, an air outlet is formed in the upper portion of the fixed sleeve, the fixed sleeve is connected into the rotary support, the rotary kiln is rotationally connected into the rotary support, the air outlet is communicated with an air channel, the air channel is communicated with an air pump through an air collecting pipe, and the air pump sucks air through the air collecting pipe and exhausts air through an exhaust pipe. The hole is formed in the material injection head end of the rotary kiln, smoke generated by spraying flames to heat cement is sucked by the air pump through the hole in the head end of the rotary kiln, smoke leakage is avoided, the smoke is subjected to spraying denitration in the exhaust pipe, the spraying device is not prone to being blocked, the rotary kiln does not need to be disassembled even if the spraying device is blocked, and replacement is convenient.

Description

Technical Field

[0001] The utility model relates to the field of cement production, in particular to an ammonia water atomization device for a cement kiln. Background Art

[0002] During the cement production process, a large amount of nitrogen oxides NOx will be generated, causing serious environmental pollution. The traditional denitration technologies for cement kilns mainly include selective non-catalytic reduction SNCR and selective catalytic reduction SCR. In order to improve the denitration efficiency of cement kilns and reduce the operating cost, the ammonia water atomization technology has gradually been applied to the denitration of cement kilns. Ammonia water atomization is to pass ammonia water through a special atomization device to form tiny droplets, and then spray them into the cement kiln. After these tiny droplets come into contact with the high-temperature flue gas, they quickly evaporate and react with NOx to complete denitration;

[0003] In the prior art, direct spraying in the cement rotary kiln is likely to cause blockage of the spraying device, and the maintenance and replacement procedures are cumbersome. The utility model solves the above problems. Summary of the Utility Model

[0004] In order to solve the technical problems that direct spraying in the cement rotary kiln in the prior art is likely to cause blockage of the spraying device and the maintenance and replacement procedures are cumbersome, the utility model further provides an ammonia water atomization device for a cement kiln.

[0005] The ammonia water atomization device for a cement kiln includes: a rotary kiln furnace. An annular groove is formed in the outer wall at the feeding first end of the rotary kiln furnace. A long hole is formed in the rotary kiln furnace at the annular groove. A fixed sleeve is rotatably connected in the annular groove. An air outlet is formed in the upper part of the fixed sleeve. The fixed sleeve is connected in a rotary support. The rotary kiln furnace is rotatably connected in the rotary support. The air outlet is communicated with an air duct. The air duct is communicated with an air pump through a collecting pipe. The air pump sucks air through the collecting pipe and discharges exhaust gas through an exhaust pipe. An ammonia water atomization mechanism is arranged in the exhaust pipe.

[0006] Further, the exhaust pipe is located on the side of the rotary kiln furnace. The exhaust pipe is arranged in a vertical multi-section rotary layout. The fog outlet end of the ammonia water atomization mechanism is arranged in the middle of each section of the exhaust pipe. The bottom of the exhaust pipe can be opened.

[0007] Further, the ammonia water atomization mechanism includes a liquid inlet pipe, which is communicated with a liquid pump and an ammonia water storage tank. The other end of the liquid inlet pipe is communicated with an atomizer. The fog outlet end of the atomizer is communicated with a fog outlet pipe through a plurality of branch pipes. One-way valves are arranged in the branch pipes. The fog outlet pipe is arranged in the middle of each section of the exhaust pipe. The axis of the fog outlet pipe is perpendicular to the axis of the exhaust pipe. A plurality of fog outlet holes are evenly distributed on the circumference of the fog outlet pipe.

[0008] Advantages of the Utility Model

[0009] A hole is provided at the feeding head end of the rotary kiln. The flue gas generated by spraying flames to heat cement is sucked into the rotary kiln through the hole at the head end by an air pump, avoiding flue gas leakage. The flue gas is subjected to spray denitration in the exhaust pipe. The spraying device is not easily blocked. Even if it is blocked, there is no need to disassemble the rotary kiln, and the replacement is convenient.

[0010] The exhaust pipe is vertically rotatably arranged, which is convenient for dust collection and internal cleaning. Description of the Drawings

[0011] Figure 1 is a schematic structural view of the present utility model Figure 1 ;

[0012] Figure 2 is an exploded schematic structural view of the present utility model;

[0013] Figure 3 is a schematic structural view of the present utility model Figure 2 。

[0014] In the figure: rotary kiln furnace 1; annular groove 2; long hole 3; fixed sleeve 4; air outlet 5; rotary support 6; air duct 7; gas collecting pipe 8; air pump 9; exhaust pipe 10; ammonia water atomization mechanism 11; liquid inlet pipe 111; atomizer 112; branch pipe 113; mist outlet pipe 114. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0016] In the present device, the so-called rotational connection means that the bearing is baked and installed on the shaft, and a spring retaining ring groove is provided on the shaft or the shaft hole. The axial fixation of the bearing is achieved by clamping the elastic retaining ring in the retaining ring groove to achieve rotation; the so-called hinged connection means an activity connection method on connecting parts such as hinges, pin shafts, and short shafts.

[0017] The present utility model will be described in detail below in conjunction with the drawings. Embodiment

[0018] Next, in combination with the attached Figures 1-3The present embodiment of the ammonia atomizing device for cement kiln comprises: a rotary kiln 1, an annular groove 2 is provided on the outer wall of the feeding head end of the rotary kiln 1, a long hole 3 is provided on the rotary kiln 1 at the annular groove 2, a fixed sleeve 4 is rotatably connected in the annular groove 2, an air outlet 5 is provided on the upper part of the fixed sleeve 4, the fixed sleeve 4 is connected in a rotary bracket 6, the rotary kiln 1 is rotatably connected in the rotary bracket 6, the air outlet 5 is connected with an air passage 7, the air passage 7 is connected with an air pump 9 through an air collecting pipe 8, the air pump 9 inhales air through the air collecting pipe 8 and exhausts air through an exhaust pipe 10, and an ammonia atomizing mechanism 11 is provided in the exhaust pipe 10;

[0019] The cement raw material enters through the feeding end of the rotary kiln 1, rolls along the inclined surface of the rotary kiln 1 toward the outlet, and the discharge end of the rotary kiln 1 sprays flames to cooperate with the rotating rotary kiln 1 to burn the cement into clinker. The air pump 9 absorbs the waste gas generated by the burning through the gas collecting pipe 8, the air duct 7, the air outlet 5, and the long hole 3, and enters the exhaust pipe 10. The waste gas will not flow back or be discharged through the discharge end of the rotary kiln 1. Since the air outlet 5 is opened at the upper part, the lower cement will not be absorbed, so the waste gas is completed and collected. The waste gas reacts with the ammonia spray of the ammonia atomizing mechanism 11 in the exhaust pipe 10 to complete the denitrification treatment. The ammonia atomizing mechanism 11 is not easy to be blocked. Even if it is blocked, there is no need to disassemble the rotary kiln, and the replacement is convenient.

[0020] The exhaust pipe 10 is located on the side of the rotary kiln 1. The exhaust pipe 10 is arranged in a vertical multi-section rotary manner. The middle of each section of the exhaust pipe 10 is provided with a mist outlet of an ammonia atomizing mechanism 11. The bottom of the exhaust pipe 10 can be opened.

[0021] The exhaust pipe 10 is vertically rotated. When the exhaust gas carries smoke and dust, the smoke and dust collide with the exhaust pipe 10, and the kinetic energy of the smoke and dust is buffered and falls to the bottom of the exhaust pipe 10. It will not be carried out with the exhaust gas, resulting in a better purification effect. When cleaning, just open the bottom of the exhaust pipe 10 for cleaning.

[0022] The ammonia atomizing mechanism 11 includes a liquid inlet pipe 111, which is connected to a liquid pump and an ammonia storage tank. The other end of the liquid inlet pipe 111 is connected to an atomizer 112. The atomizer 112 is connected to a mist outlet pipe 114 through a plurality of branch pipes 113. A one-way valve is provided in the branch pipe 113. A mist outlet pipe 114 is provided in the middle of each exhaust pipe 10. The axis of the mist outlet pipe 114 is perpendicular to the axis of the exhaust pipe 10. A plurality of mist outlet holes are evenly distributed on the circumference of the mist outlet pipe 114.

[0023] The liquid pump draws ammonia water into the atomizer 112 through the liquid inlet pipe 111, and then enters the branch pipe 113 and is discharged through the mist outlet pipe 114. Since the axis of the mist outlet pipe 114 is perpendicular to the axis of the exhaust pipe 10, a plurality of mist outlet holes are evenly distributed on the circumference of the mist outlet pipe 114. The mist outlet pipe 114 evenly discharges mist in the circumferential direction, fully contacting with the flue gas for denitrification. A one-way valve is provided in the branch pipe 113 to prevent the exhaust gas from flowing back.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0025] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Ammonia atomization device for cement kiln, characterized in that: Including: A rotary kiln (1), on the outer wall of the feeding front end of the rotary kiln (1), an annular groove (2) is provided, a long hole (3) is provided in the rotary kiln (1) at the annular groove (2), a fixed sleeve (4) is rotatably connected in the annular groove (2), an air outlet (5) is provided at the upper part of the fixed sleeve (4), the fixed sleeve (4) is connected in a rotary support (6), the rotary kiln (1) is rotatably connected in the rotary support (6), the air outlet (5) is communicated with an air duct (7), the air duct (7) is communicated with an air pump (9) through a collecting pipe (8), the air pump (9) sucks air through the collecting pipe (8) and discharges air through an exhaust pipe (10), and an ammonia water atomizing mechanism (11) is provided in the exhaust pipe (10).

2. The ammonia water atomizing device for a cement kiln according to claim 1, characterized in that: The exhaust pipe (10) is located on the side of the rotary kiln (1), the exhaust pipe (10) is arranged in a vertical multi-segment rotary layout, the middle of each section of the exhaust pipe (10) is provided with the mist outlet end of the ammonia water atomizing mechanism (11), and the bottom of the exhaust pipe (10) can be opened.

3. The ammonia water atomization device for a cement kiln according to claim 2, characterized in that: The ammonia water atomizing mechanism (11) includes a liquid inlet pipe (111), the liquid inlet pipe (111) is communicated with a liquid pump and an ammonia water storage tank, the other end of the liquid inlet pipe (111) is communicated with an atomizer (112), the mist outlet end of the atomizer (112) is communicated with a mist outlet pipe (114) through a plurality of branch pipes (113), one-way valves are provided in the branch pipes (113), the middle of each section of the exhaust pipe (10) is provided with a mist outlet pipe (114), the axis of the mist outlet pipe (114) is perpendicular to the axis of the exhaust pipe (10), and a plurality of mist outlet holes are evenly distributed in the circumferential direction on the mist outlet pipe (114).

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