Ammonia-saving resistance-reducing structure of cement clinker preheater
By adjusting the structure and channel shape at the connection between the preheater and the decomposition furnace, and combining it with a concentration sensor control system, the problems of ash accumulation in the preheater and high ammonia consumption were solved, achieving the effects of resistance reduction and denitrification, thereby improving the efficiency and environmental performance of cement production.
Patent Information
- Application Number
- CN202520308409.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-02-25
AI Technical Summary
In the cement production process, there is a problem of ash accumulation at the connection between the preheater and the decomposition furnace, which leads to increased resistance and excessive ammonia consumption, affecting production efficiency and environmental benefits.
By adjusting the slope angle at the connection between the five-stage preheater and the decomposition furnace to 45°, setting a funnel-shaped channel, increasing the ventilation area, and creating an oxygen-deficient environment at the bottom of the conical feed cylinder, NOx is reduced by flue gas reduction. At the same time, a concentration sensor and control system are used to precisely control the ammonia water injection volume to achieve precise denitrification.
It effectively reduced the preheater resistance, decreased ammonia consumption, stabilized the thermal regime, improved production efficiency, and achieved efficient control of nitrogen oxide emissions and ammonia escape.
Smart Images
Figure CN223882766U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cement production preheater technology, specifically to a cement clinker preheater ammonia-saving and resistance-reducing structure. Background Technology
[0002] In cement production, the fineness of raw meal fed into the preheater is generally ≤25% residue on an 80μm sieve and ≤3% residue on a 200μm sieve. The resistance of a single-stage cyclone separator is generally 800–1500 Pa, with some production lines exceeding 2000 Pa in resistance. The resistance of the entire five-stage preheater system is >5000 Pa. The material is preheated in the first to fourth stage preheaters before entering the decomposition furnace for reaction. The reacted material then enters the fifth-stage preheater (C5), where it is collected and further preheated before entering the kiln. The accumulation of material at the inlets of the fifth-stage preheater and each stage of the cyclone separator is a key issue restricting the production increase and resistance reduction of the preheater and kiln systems.
[0003] See Figure 1 This is the connection between the conical feed cylinder 2 and the decomposition furnace 1. The bottom of the decomposition furnace 1 is connected to the outlet of the fourth-stage preheater via the conical feed cylinder 2. A coal gun 3 is connected to the side wall of the conical feed cylinder 2. The top of the decomposition furnace 1 is connected to the fifth-stage preheater via a sloping channel 4. An inclined tertiary air channel 5 is connected to the side wall of the conical feed cylinder 2. The slope angle of the sloping channel 4 changes from 30° to 45°, and ash accumulates at the angle of change. In addition, the purpose of the coal gun 3 and the tertiary air inlet position at the connection between the decomposition furnace 1 and the fourth-stage preheater is to establish a reduction zone above the smoke chamber, reducing NO through self-reduction. X This can save ammonia water to some extent. However, saving ammonia water requires a reasonable reaction temperature range and an oxidizing atmosphere. Based on the above issues, research on ammonia-saving and drag-reducing technology for cement clinker preheaters has significant environmental and economic benefits. Utility Model Content
[0004] This invention overcomes the shortcomings of the prior art and proposes an ammonia-saving and resistance-reducing structure for cement clinker preheaters; it solves the problems of ash accumulation at the connection between the preheater and the decomposition furnace and the large amount of ammonia used.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] The utility model relates to a cement clinker preheater ammonia saving and resistance reducing structure, including decomposing furnace, the bottom of decomposing furnace is connected with four stage preheater export through the taper feeding cylinder, the side wall of taper feeding cylinder is connected with coal gun, the top of decomposing furnace is connected with five stage preheater through the ramp channel, the side wall of taper feeding cylinder is connected with the inclined third air channel, the furnace wall of decomposing furnace is opened the air inlet, and the air inlet is connected with horizontal third air channel, the horizontal third air channel is connected with the inclined third air channel, and the inclined third air channel and taper feeding cylinder are provided with retaining wall, the top of decomposing furnace is connected with the ramp channel, and the ramp channel is the funnel structure, the small mouth of funnel structure is connected with decomposing furnace, and the big mouth of funnel structure is connected with five stage preheater, the side wall of ramp channel is linear.
[0007] Further, the inclination angle of the ramp channel is 30-60°.
[0008] Further, the decomposing furnace is connected with the SCR reaction tower through the waste gas channel.
[0009] Further, the decomposing furnace is provided with an ammonia injection pipeline, and the ammonia injection pipeline is provided with an ammonia water injection gun.
[0010] Further, the decomposing furnace is connected with a concentration sensor, and the concentration sensor is connected with the electromagnetic valve of the ammonia water injection gun in the decomposing furnace through a controller.
[0011] Further, the SCR reaction tower is provided with an ammonia injection pipeline, and the ammonia injection pipeline in the SCR reaction tower is connected with an ammonia water injection gun, and the concentration sensor is connected with the ammonia water injection gun in the SCR reaction tower through a controller.
[0012] Further, three coal guns are distributed around 120° on the side wall of the taper feeding cylinder.
[0013] The utility model discloses relative to the beneficial effect produced in prior art is:
[0014] 1, the utility model discloses the ramp angle 30 of five stage preheater place is changed to 45 of the ramp, eliminates the change angle, and the whole ramp is changed to 45 uniformly, eliminates the ash of change place, and the channel section of ramp place is adjusted to funnel shape, effectively guarantee the ventilation area, make five stage preheater and decomposing furnace connect the ventilation area of place increase, effectively guarantee the smooth of decomposing furnace feed place.
[0015] 2, the utility model discloses the three stage wind pipe of the taper feeding cylinder of four stage preheater and decomposing furnace connection is adjusted to the furnace side wall of decomposing furnace, lifts the air inlet height, forms the oxygen deficiency environment in the lower part of taper feeding cylinder, makes the reduction zone in taper feeding cylinder, reduces NO XThe utility model discloses a change three times wind position into the furnace, lengthen the reduction area of furnace bottom, reach the purpose of reducing ammonia water consumption, stabilizing the thermal regime, make the decomposing furnace end give full play to its predecomposition function, avoid high temperature with the migration of upper, lead to the whole disorder of preheater, and the resistance increases.
[0016] 3、The utility model discloses a concentration sensor and control system can real -time monitoring NOx concentration in flue gas, and according to real -time data accurate control ammonia water's injection amount, make it and NOx in flue gas fully react, reach the purpose of high -efficient denitrification. Reach accurate ammonia injection, control nitrogen oxides emission and ammonia escape. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is the schematic diagram of preheater and decomposing furnace connection structure of prior art;
[0018] Figure 2 It is the schematic diagram of preheater and decomposing furnace connection structure of the utility model;
[0019] Reference Signs:
[0020] 1, decomposing furnace;2, conical feeding cylinder;3, coal gun;4, slope channel;5, inclined third air channel;6, horizontal third air channel;7, retaining wall;8, waste gas channel;9, SCR reaction tower;10, ammonia injection pipeline;11, concentration sensor. DETAILED DESCRIPTION
[0021] In order to make the technical problem, technical scheme and beneficial effect that the utility model wants to solve more clearly clear, combine embodiment and attached drawing, further detailed explanation is made to the utility model. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model. The technical scheme of the utility model is explained in detail below in combination with the embodiment and the attached drawing, but the protection scope is not limited by this.
[0022] See Figure 2The embodiment provides a cement clinker preheater ammonia-saving and resistance-reducing structure, which comprises a decomposing furnace 1, the bottom of the decomposing furnace 1 is connected with the outlet of a four-stage preheater through a conical feeding cylinder 2, a coal gun 3 is connected to the side wall of the conical feeding cylinder 2, the top of the decomposing furnace 1 is connected with a five-stage preheater through a slope-shaped channel 4, an inclined third air channel 5 is connected to the side wall of the conical feeding cylinder 2, an air inlet is formed in the furnace wall of the decomposing furnace 1, the air inlet is connected with a horizontal third air channel 6, the horizontal third air channel 6 is connected with the inclined third air channel 5, and a retaining wall 7 is arranged between the inclined third air channel 5 and the conical feeding cylinder 2, the function of the retaining wall 7 is to block the path of the third air entering the conical feeding cylinder 2 through the inclined third air channel 5, in the embodiment, the third air enters the decomposing furnace through the horizontal third air channel 6 at the side wall of the decomposing furnace 1, the structure generates the effect that an oxygen-deficient environment can be formed at the lower part of the conical feeding cylinder 2, so that a reduction zone is formed at the conical feeding cylinder 2, the NOx content in the flue gas is reduced through self-reduction of the flue gas, and the amount of ammonia water used can be reduced. X Thus, the amount of ammonia water used can be reduced.
[0023] In order to improve the effective utilization of ammonia water, in the embodiment, the decomposing furnace 1 is connected with an SCR reaction tower 9 through a waste gas channel 8, an ammonia injection pipeline 10 is arranged at the top of the decomposing furnace 1, the ammonia injection pipeline 10 is provided with an ammonia water injection gun, the decomposing furnace 1 is connected with a concentration sensor 11, the concentration sensor 11 is connected with an electromagnetic valve of the ammonia water injection gun in the decomposing furnace 1 through a controller, the ammonia injection pipeline 10 is arranged in the SCR reaction tower 9, the ammonia injection pipeline 10 in the SCR reaction tower 9 is connected with an ammonia water injection gun, and the concentration sensor 11 is connected with the ammonia water injection gun in the SCR reaction tower 9 through a controller, the flue gas is reduced in NOx content through self-reduction at the conical feeding cylinder 2, the NOx content in the flue gas is detected by the concentration sensor 11, and the opening and closing of the ammonia water injection gun in the SCR reaction tower 9 and the ammonia water injection gun in the decomposing furnace 1 can be accurately controlled. X The concentration sensor 11 detects the NOx content in the decomposing furnace 1 on the basis of the NOx content in the flue gas, the opening and closing of the ammonia water injection gun in the SCR reaction tower 9 and the ammonia water injection gun in the decomposing furnace 1 can be accurately controlled, the injection amount of ammonia water can be accurately controlled, the injected ammonia water can fully react with NOx in the flue gas, and the purpose of efficient denitration is achieved. X The concentration sensor 11 detects the NOx content in the decomposing furnace 1 on the basis of the NOx content in the flue gas, the opening and closing of the ammonia water injection gun in the SCR reaction tower 9 and the ammonia water injection gun in the decomposing furnace 1 can be accurately controlled, the injection amount of ammonia water can be accurately controlled, the injected ammonia water can fully react with NOx in the flue gas, and the purpose of efficient denitration is achieved.
[0024] In the embodiment, the slope-shaped channel 4 connected to the top of the decomposing furnace 1 is in a funnel shape, the small opening of the funnel-shaped structure is connected with the decomposing furnace 1, the large opening of the funnel-shaped structure is connected with the five-stage preheater, the side wall of the slope-shaped channel 4 is in a straight line, and the inclination angle of the slope-shaped channel 4 is 45°. In the embodiment, the slope angle of the slope-shaped channel 4 is changed from 30° to 45°, the turning angle is eliminated, the ash accumulation at the turning position is eliminated, the channel section at the slope position is adjusted to be funnel-shaped, the ventilation area is effectively ensured, the ventilation area of the connection position of the five-stage preheater and the decomposing furnace is increased, and the smoothness of the feeding position of the decomposing furnace is effectively ensured.
[0025] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be deemed to limit the specific embodiments of the present application to this. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the present application, a number of simple deductions or substitutions can be made, and all of them shall be deemed to belong to the present application, and the patent protection scope is determined by the submitted claims.
Claims
1. A cement clinker preheater ammonia-saving and resistance-reducing structure, comprising a decomposition furnace (1), wherein the bottom of the decomposition furnace (1) is connected to the outlet of a fourth-stage preheater via a conical feed cylinder (2); a coal gun (3) is connected to the side wall of the conical feed cylinder (2); the top of the decomposition furnace (1) is connected to a fifth-stage preheater via a sloping channel (4); and an inclined tertiary air channel (5) is connected to the side wall of the conical feed cylinder (2); characterized in that, The decomposition furnace (1) is provided with an air inlet on the furnace wall, and the air inlet is connected with a horizontal tertiary air channel (6); the horizontal tertiary air channel (6) is connected with an inclined tertiary air channel (5), and the inclined tertiary air channel (5) is provided with a retaining wall (7) between the inclined tertiary air channel (5) and the conical feeding cylinder (2); the inclined channel (4) connected with the top of the decomposition furnace (1) is in a funnel shape, the small opening of the funnel-shaped structure is connected with the decomposition furnace (1), and the large opening of the funnel-shaped structure is connected with a five-stage preheater; the side wall of the inclined channel (4) is in a straight line.
2. The ammonia-reducing and resistance-reducing structure of a cement clinker preheater according to claim 1, characterized in that, The inclined angle of the inclined channel (4) is 30-60°.
3. The ammonia-reducing and resistance-reducing structure of a cement clinker preheater according to claim 1, characterized in that, The decomposition furnace (1) is connected with an SCR reaction tower (9) through a waste gas channel (8).
4. The ammonia-reducing, drag-reducing structure for a cement clinker preheater according to claim 3, characterized in that, The decomposition furnace (1) is provided with an ammonia injection pipeline (10) on the top, and the ammonia injection pipeline (10) is provided with an ammonia water injection gun.
5. The ammonia-reducing, drag-reducing structure for a cement clinker preheater according to claim 4, characterized in that, The decomposition furnace (1) is connected with a concentration sensor (11), and the concentration sensor (11) is connected with the electromagnetic valve of the ammonia water injection gun in the decomposition furnace (1) through a controller.
6. The ammonia-reducing, drag-reducing structure for a cement clinker preheater according to claim 5, characterized in that, The SCR reaction tower (9) is provided with an ammonia injection pipeline (10) therein, the ammonia injection pipeline (10) in the SCR reaction tower (9) is connected with an ammonia water injection gun, and the concentration sensor (11) is connected with the ammonia water injection gun in the SCR reaction tower (9) through a controller.
7. The ammonia-reducing, drag-reducing structure for a cement clinker preheater according to claim 1, characterized in that, Three coal guns (3) are distributed in a ring of 120° on the side wall of the conical feeding cylinder (2).