Decomposing furnace tailing pipe capable of improving combustion efficiency

Abstract

The utility model relates to the technical field of coal injection ducts, and discloses a decomposing furnace tail coal duct capable of improving combustion efficiency. The decomposing furnace tail coal pipe capable of improving the combustion efficiency comprises a machine assembly, a decomposing furnace assembly is mounted on the left side of the upper end of the machine assembly, a decomposing furnace body is mounted at the upper end of the decomposing furnace assembly, a first mounting hole is formed in the upper end of the decomposing furnace body, and a second mounting hole is formed in the lower end of the first mounting hole; a coal injection pipe assembly is installed above the decomposing furnace assembly, a small tailing pipe is installed at the upper end of the coal injection pipe assembly, an upper tailing pipe is installed at the upper end of the small tailing pipe, a device ring is installed in the upper tailing pipe, and air fins are installed in the device ring. The problems that unstable factors are brought to a system, the system is prone to skinning, ventilation of the system is affected, and skinning blockage is prone to being caused due to the fact that the temperature of the decomposing furnace is unstable are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal injection pipes, in particular to a decomposition furnace tail coal pipe capable of improving combustion efficiency. Background Art

[0002] In the cement production process, the decomposition furnace is the core equipment of the entire production line. Its working efficiency has a decisive influence on the output and quality of clinker burning. The working capacity of the decomposition furnace is affected by both its design structure and the performance of the tail coal pipe. However, in actual operation, it is found that the combustion effect of the tail coal pipe is not ideal, especially when the calorific value of coal powder is low. The furnace temperature is difficult to control stably, which directly leads to a decline in clinker quality and output.

[0003] The existing referenceable Chinese utility model patent has the announcement number CN201944869U, which discloses a coal injection pipe for a decomposition furnace, belonging to the field of production equipment components in the cement industry, and includes a coal injection channel and a clean air channel. A cyclone is provided at the end of the clean air channel. The key point of this technology is that the clean air channel and the coal injection channel are independent of each other, and an adjusting bolt is provided at the rear end of the clean air channel. An adjusting nut is fitted on the adjusting bolt, and the end of the adjusting bolt is fixed to the coal injection channel. After the above-mentioned improvement to the existing technology, the present utility model enables the cyclone to be moved back and forth for adjustment, thereby changing the mixing effect of the clean air on the coal powder. It can not only control the linear distance of the coal powder spraying, but also control the dispersion angle of the coal powder. Therefore, it has the advantages of being able to adjust the dispersion and mixing degree of the coal powder, and having a simple structure and reliable operation.

[0004] Based on the search of the above patents and combined with the equipment in the prior art, it was found that the working efficiency of the decomposition furnace is affected by multiple factors, among which the design structure and the performance of the tail coal pipe are the two most critical aspects. The existing tail coal pipe has always had a poor combustion effect in actual application, especially when the calorific value of the coal powder is low, the furnace temperature is not easy to control stably, and the outlet temperature of the decomposition furnace is more than 10°C lower than the temperature of the five-stage discharge pipe, resulting in unburned coal powder entering the kiln tail with the raw material, causing the smoke chamber temperature to be high, and the rear ring and auxiliary kiln skin to be easily formed at the rear of the rotary kiln, thereby affecting the ventilation in the kiln and the quality of the clinker. Every time the five-stage large volute is overhauled, it is found that the crusting is quite serious. The existence of these problems affects the use of the device. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the utility model provides a decomposition furnace tail coal pipe that improves combustion efficiency. It can effectively prevent the coal powder in the pre-combustion furnace from burning poorly, the temperature of the decomposition furnace from fluctuating, which brings instability to the system, and the system is prone to crusting, affecting system ventilation and easily causing crusting blockage, thereby achieving the purpose of saving coal consumption, improving clinker quality, saving costs, and ensuring stable operation of the preheater system.

[0007] Technical Solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a decomposition furnace tail coal pipe for improving combustion efficiency, comprising a machine assembly, wherein a decomposition furnace assembly is installed on the left side of the upper end of the machine assembly for facilitating the installation of the upper end coal injection pipe assembly, facilitating the subsequent decomposition of raw materials such as limestone in the raw material into lime and carbon dioxide at high temperature; the upper connection of the decomposition furnace assembly is conducive to subsequently ensuring the stability of the temperature of the decomposition furnace body, stabilizing the decomposition rate entering the kiln, and improving the quality of the clinker.

[0009] The upper end of the decomposition furnace assembly is installed with a decomposition furnace body, and the upper end of the decomposition furnace body is installed with a first mounting hole, the lower end of the first mounting hole is installed with a second mounting hole, and the second mounting hole is installed at the lower end of the first mounting hole, so as to facilitate the subsequent installation of the small tail coal pipe;

[0010] A small tail coal pipe is installed at the upper end of the coal injection pipe assembly, and an upper tail coal pipe is installed at the upper end of the small tail coal pipe. A device ring is installed inside the upper tail coal pipe, and a wind wing is installed inside the device ring. The micro motor is used in combination with the wind wing to facilitate the subsequent transportation of coal powder.

[0011] As a preferred technical solution of the present invention, a mounting frame is installed on the upper end of the machine assembly, and a Roots blower is installed on the upper end of the mounting frame. The Roots blower is installed on the upper end of the mounting frame to facilitate subsequent coal powder transportation.

[0012] As a preferred technical solution of the present invention, a necking is installed at the lower end of the decomposition furnace assembly, and the necking is installed at the lower end of the decomposition furnace body to facilitate the subsequent discharge of the decomposed raw materials.

[0013] As a preferred technical solution of the present invention, a micro motor is installed at the upper end of the coal injection pipe assembly, and the micro motor is used in combination with wind wings to facilitate the subsequent transportation of coal powder.

[0014] As a preferred technical solution of the present invention, the decomposition furnace assembly is installed on the left side of the Roots blower in the machine assembly, and the coal injection pipe assembly is installed above the decomposition furnace body in the decomposition furnace assembly.

[0015] As a preferred technical solution of the present invention, the tail pressure of the Roots blower is about 50,000 Pa, and the fluctuation is less than 2,000 Pa.

[0016] As a preferred technical solution of the present invention, there are three first mounting holes, and an upper tail coal pipe is inserted into the interior of the first mounting holes; there are two second mounting holes, and a small tail coal pipe is inserted into the interior of the second mounting holes.

[0017] As the preferred technical solution of the present invention, the diameter of the upper tail coal pipe is 130 mm, there are three upper tail coal pipes, and the upper tail coal pipes form an angle of 120° with each other. The position of the small tail coal pipe is moved up by 1.5 m, and the diameter of the small tail coal pipe is 130 mm.

[0018] Compared with the prior art, the utility model provides a decomposition furnace tail coal pipe that improves combustion efficiency and has the following beneficial effects:

[0019] 1. The utility model sets up the whole device, adds one more upper tail coal pipe at the same height position of the original two upper tail coal pipes with a diameter of 130mm, and the three upper tail coal pipes form an angle of 120 degrees with each other, so that the coal is evenly distributed. Two small tail coal pipes with a diameter of 130mm are added above the conical part of the decomposition furnace body, and the positions of the two small tail coal pipes are moved up by 1.5m, so that the outlet temperature of the decomposition furnace is 8-12℃ higher than the outlet temperature of the fifth stage, thereby improving the combustion efficiency. The decomposition furnace structure with no tail coal pipe wind fins on the conical part is adopted, and the frequency conversion speed control system is used according to the combustion The coal supply is adjusted in real time according to the change of load, the frequency of Roots blower is maintained at 45hz, the coal supply pressure is reduced to 50000Pa, and the pressure fluctuation is less than 2000Pa, which is beneficial to improving the quality of clinker and effectively preventing the low calorific value of coal powder. The furnace temperature is difficult to be stably controlled. The outlet temperature of the decomposition furnace is more than 10℃ lower than the temperature of the five-stage discharge pipe, resulting in unburned coal powder entering the kiln tail with the raw material, causing high temperature in the smoke chamber, and easy formation of rear ring and auxiliary kiln skin at the rear of the rotary kiln, which in turn affects the ventilation in the kiln and the quality of clinker. During each maintenance, it is found that the crusting of the five-stage large volute is quite serious. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the machine components of the utility model structure;

[0022] Figure 3 This is a schematic diagram of the decomposition furnace components of the utility model;

[0023] Figure 4 This is a schematic diagram of the coal injection pipe assembly of the utility model structure.

[0024] Among them: 1. Machine assembly; 101. Mounting frame; 102. Roots blower; 2. Decomposition furnace assembly; 201. Decomposition furnace body; 202. First mounting hole; 203. Second mounting hole; 204. Narrowing; 3. Coal injection pipe assembly; 301. Small tail coal pipe; 302. Upper tail coal pipe; 303. Device ring; 304. Micro motor; 305. Wind fin. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] See also Figure 1 - Figure 4 In this embodiment, a decomposition furnace tail coal pipe for improving combustion efficiency includes: a machine component 1, a decomposition furnace component 2 is installed on the left side of the upper end of the machine component 1, a decomposition furnace body 201 is installed on the upper end of the decomposition furnace component 2, and a first mounting hole 202 is installed at the upper end of the decomposition furnace body 201, and a second mounting hole 203 is installed at the lower end of the first mounting hole 202, a coal injection pipe component 3 is installed above the decomposition furnace component 2, a small tail coal pipe 301 is installed at the upper end of the coal injection pipe component 3, and an upper tail coal pipe 302 is installed at the upper end of the small tail coal pipe 301, a device ring 303 is installed inside the upper tail coal pipe 302, and a wind wing 305 is installed inside the device ring 303, the decomposition furnace component 2 is installed on the left side of the Roots blower 102 in the machine component 1, and the coal injection pipe component 3 is installed above the decomposition furnace body 201 in the decomposition furnace component 2.

[0029] Through the above structure: the machine component 1 is convenient for installing the internal Roots blower 102, which is convenient for the subsequent transportation of coal powder; the decomposition furnace component 2 is convenient for installing the upper end coal injection pipe component 3, which is convenient for the subsequent decomposition of limestone and other raw materials in the raw material into lime and carbon dioxide at high temperature; the coal injection pipe component 3 is convenient for transporting coal powder and is convenient for subsequently ensuring the stability of the temperature of the decomposition furnace body 201, stabilizing the decomposition rate entering the kiln, and improving the quality of clinker.

[0030] See also Figure 1 - Figure 4 A mounting frame 101 is installed on the upper end of the machine component 1, and a Roots blower 102 is installed on the upper end of the mounting frame 101. The tail pressure of the Roots blower 102 is about 50,000 Pa, and the fluctuation is less than 2,000 Pa.

[0031] Through the above structure: the Roots blower 102 at the upper end is installed by installing the mounting frame 101, which is convenient for subsequent use of the Roots blower 102. The Roots blower 102 is installed at the upper end of the mounting frame 101, which is convenient for subsequent coal powder transportation.

[0032] See also Figure 1 - Figure 4 The lower end of the decomposition furnace assembly 2 is equipped with a constriction 204, the number of the first mounting holes 202 is three, and the upper tail coal pipe 302 is inserted into the interior of the first mounting holes 202, the number of the second mounting holes 203 is two, and the small tail coal pipe 301 is inserted into the interior of the second mounting holes 203.

[0033] Through the above structure: the limestone raw material in the raw meal is decomposed at high temperature by installing the decomposition furnace body 201, the first installation hole 202 is installed at the upper end of the decomposition furnace body 201, which is convenient for the subsequent installation of the upper tail coal pipe 302, the second installation hole 203 is installed at the lower end of the first installation hole 202, which is convenient for the subsequent installation of the small tail coal pipe 301, and the necking 204 is installed at the lower end of the decomposition furnace body 201, which is convenient for the subsequent discharge of the decomposed raw materials.

[0034] See also Figure 1 - Figure 4 A micro motor 304 is installed at the upper end of the coal injection pipe assembly 3. The diameter of the upper tail coal pipe 302 is 130 mm. There are three upper tail coal pipes 302, and the upper tail coal pipes 302 form an angle of 120° with each other. The position of the small tail coal pipe 301 is moved up by 1.5 m, and the diameter of the small tail coal pipe 301 is 130 mm.

[0035] Through the above structure: the coal delivery pressure is reduced by installing the small tail coal pipe 301, which is convenient for the subsequent increase in clinker strength and the subsequent pressure stabilization. The upper tail coal pipe 302 is installed at the upper end of the small tail coal pipe 301, which is convenient for the subsequent uniform dispersion of coal powder, so that the coal powder is fully burned and the amount of tail coal is reduced. The device ring 303 is installed inside the upper tail coal pipe 302, which is convenient for the subsequent installation of the internal micro motor 304. The micro motor 304 is used in combination with the wind fin 305 to facilitate the subsequent transportation of coal powder.

[0036] When in use, first, add another upper tail coal pipe 302 at the same height position of the original two upper tail coal pipes 302 with a diameter of 130 mm. The upper tail coal pipe 302 is installed in the first installation hole 202 at the upper end of the decomposition furnace body 201. The three upper tail coal pipes 302 form an angle of 120° with each other, which is convenient for the subsequent uniform transportation of coal powder. Two small tail coal pipes 301 with a diameter of 92 mm are added above the conical neck 204 of the decomposition furnace body 201, so that the outlet temperature of the decomposition furnace body 201 is 8-12°C higher than the outlet temperature of the fifth stage, thereby improving the combustion efficiency. When the number of upper tail coal pipes 302 is increased to three during the test, the outlet temperature of the decomposition furnace body 201 is increased by 8-12°C. At 02, it was found that the temperature fluctuation of the decomposition furnace body 201 was still large, and the pressure of the Roots blower 102 was about 62000Pa, which was too high. Two 92mm small tail coal pipes 301 were added, and it was found that the pressure of the tail coal Roots blower 102 dropped to about 55000Pa, but the pressure fluctuation was large, about 4000Pa. After the positions of the two small tail coal pipes 301 were moved up by 1.5m, the diameter was increased to 130mm, and the wind fins 305 inside the small tail coal pipe 301 were removed, the problem was solved, and the pressure of the tail coal Roots blower 102 dropped to about 50000Pa, and the pressure fluctuation was less than 2000Pa.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calciner tail coal pipe for improving combustion efficiency, characterized in that: The invention comprises a machine component (1), wherein a decomposition furnace component (2) is installed on the left side of the upper end of the machine component (1), a decomposition furnace body (201) is installed on the upper end of the decomposition furnace component (2), and a first mounting hole (202) is installed on the upper end of the decomposition furnace body (201), and a second mounting hole (203) is installed on the lower end of the first mounting hole (202), a coal injection pipe component (3) is installed above the decomposition furnace component (2), a small tail coal pipe (301) is installed on the upper end of the coal injection pipe component (3), and an upper tail coal pipe (302) is installed on the upper end of the small tail coal pipe (301), a device ring (303) is installed inside the upper tail coal pipe (302), and a wind wing (305) is installed inside the device ring (303).

2. The tail coal pipe for a calciner for improving combustion efficiency according to claim 1, characterized in that: A mounting frame (101) is installed on the upper end of the machine component (1), and a Roots blower (102) is installed on the upper end of the mounting frame (101).

3. The tail coal pipe for a calciner for improving combustion efficiency according to claim 1, characterized in that: The lower end of the decomposition furnace assembly (2) is provided with a necking (204).

4. The tail coal pipe for a calciner for improving combustion efficiency according to claim 1, characterized in that: A micro motor (304) is installed at the upper end of the coal injection pipe assembly (3).

5. The tail coal pipe for a calciner for improving combustion efficiency according to claim 1, characterized in that: The decomposition furnace assembly (2) is installed on the left side of the Roots blower (102) in the machine assembly (1), and the coal injection pipe assembly (3) is installed above the decomposition furnace body (201) in the decomposition furnace assembly (2).

6. The tail coal pipe for a calciner for improving combustion efficiency according to claim 2, characterized in that: The tail pressure of the Roots blower (102) is about 50,000 Pa, and the fluctuation is less than 2,000 Pa.

7. The tail coal pipe for a calciner for improving combustion efficiency according to claim 3, characterized in that: The number of the first mounting holes (202) is three, and an upper tail coal pipe (302) is inserted and connected inside the first mounting holes (202). The number of the second mounting holes (203) is two, and a small tail coal pipe (301) is inserted and connected inside the second mounting holes (203).

8. The tail coal pipe for a calciner for improving combustion efficiency according to claim 4, characterized in that: The diameter of the upper tail coal pipe (302) is 130 mm, there are three upper tail coal pipes (302), and the upper tail coal pipes (302) form an angle of 120° with each other. The position of the small tail coal pipe (301) is moved up by 1.5 m, and the diameter of the small tail coal pipe (301) is 130 mm.

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