Coal injection combustion device of cement kiln decomposing furnace
By installing a conical cylindrical disperser inside the tail coal injection end to form a pentagonal partition, the problem of uneven coal powder dispersion is solved, achieving uniform combustion and stable mixing of coal powder, thereby improving the efficiency of the decomposition furnace and the quality of clinker.
Patent Information
- Application Number
- CN202520276680.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-02-20
AI Technical Summary
The existing cement kiln decomposition furnace has poor coal powder dispersion at the tail coal injection end, resulting in incomplete combustion, uneven mixing of air, coal and material in the decomposition furnace, and unstable decomposition furnace pressure and reduced clinker quality.
A conical cylindrical disperser is installed inside the tailings injection end, with a pentagonal partition inside. Powdered coal is evenly injected through five channels to achieve uniform combustion.
It improves the uniformity and stable combustion of pulverized coal, enhances the mixing effect in the decomposition furnace, and increases the decomposition rate and clinker quality in the kiln.
Smart Images
Figure CN223882324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cement production technology, specifically to a pulverized coal combustion device for a cement kiln decomposition furnace. Background Technology
[0002] Dry process cement production is a cement production process that primarily involves simultaneously drying and grinding raw materials, or drying and grinding them into raw meal powder before feeding it into a dry process kiln for calcination into clinker. A precalciner is installed within the dry process kiln, its function being to efficiently complete fuel combustion and material decomposition within a short time. The precalciner has a complex and varied structure, but typically includes a main furnace body and a reaction chamber. The main furnace body maintains the external temperature of the reaction chamber within a certain range and allows for the direct injection of air and fuel. The reaction chamber is composed of multiple parts, such as the furnace plate, reaction chamber plate, and reaction chamber shaft, which work together to ensure efficient reaction within the chamber. The tail coal injection end of the precalciner is a crucial point where pulverized coal enters the precalciner for combustion. During cement production, pulverized coal, after being crushed and ground, is fed into the precalciner through a specific conveying system. A portion of the pulverized coal enters the precalciner through the tail coal injection end, ensuring uniform distribution and efficient combustion within the precalciner, thereby improving thermal and decomposition efficiency.
[0003] The existing tailings pulverized coal injection end is a heat-resistant steel pipe with an inner diameter of 240mm. During the injection process, due to the high density of the pulverized coal, localized over-density often occurs, resulting in poor dispersion and incomplete combustion. This leads to unstable pressure in the decomposition furnace and pulverized coal deflagration. Consequently, the mixing of air, coal, and feedstock within the decomposition furnace is inadequate, affecting the raw meal decomposition rate in the kiln. Ultimately, this increases the load on the rotary kiln, impacting clinker quality. Utility Model Content
[0004] This invention overcomes the shortcomings of the prior art and proposes a pulverized coal combustion device for a cement kiln decomposition furnace; solving the problem of poor pulverized coal dispersion at the tail coal injection end.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] A pulverized coal combustion device for a cement kiln decomposition furnace includes a tailings pulverized coal injection end; a disperser is provided inside the tailings pulverized coal injection end; the disperser includes a conical cylindrical body; the top and bottom of the conical cylindrical body are both open structures; the top of the conical cylindrical body is a small-mouth pulverized coal inlet, and the bottom of the conical cylindrical body is a large-mouth pulverized coal outlet; the small-mouth pulverized coal inlet is located inside the tailings pulverized coal injection end, and the large-mouth pulverized coal outlet is close to the outlet side of the tailings pulverized coal injection end;
[0007] The big mouth end coal powder outlet inner wall is uniformly provided with five partitions, one end of the partition is fixedly connected with the inner wall of the conical cylindrical body, the other end of the partition is fixedly connected with the side wall of the adjacent partition, and a regular pentagon structure is formed in the conical cylindrical body.
[0008] Further, the tail coal injection end is a cylindrical structure.
[0009] Further, the tail coal injection end is a steel material.
[0010] Further, the conical cylindrical body and the partition are both steel materials.
[0011] Further, one end of the five partitions is welded with the inner wall of the conical cylindrical body.
[0012] Further, the geometric center of the regular pentagon structure coincides with the geometric center of the conical cylindrical body and the tail coal injection end.
[0013] Further, the height of the conical cylindrical body is 100-150mm; the small mouth end coal powder inlet and the big mouth end coal powder outlet of the conical cylindrical body are both circular.
[0014] Further, the diameter of the big mouth end coal powder outlet is 100-120mm; the diameter of the small mouth end coal powder inlet is 40-60mm.
[0015] Further, the height of the partition is 1 / 3-1 / 2 of the height of the conical cylindrical body.
[0016] The beneficial effects of the present application relative to the prior art are:
[0017] The present application sets a disperser in the inside of the tubular tail coal injection end, the structure of the disperser adopts external taper, and the inside adopts five partitions to form a solid with pentagon center, the coal powder entering the tail coal injection end is uniformly sprayed out through the five channels outside the pentagon of the disperser, and the uniform scattering effect of the coal powder is effectively realized; the uniform and stable combustion of the coal powder is realized, the mixing effect of the wind, coal and material in the furnace is improved, the decomposition rate into the kiln is improved, and high-quality and high-yield of the clinker are realized. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is the external structure and position schematic view of the disperser of the present application;
[0019] Figure 2 is the bottom view of the disperser of the present application;
[0020] Figure 3 is the structure schematic view of the disperser in the comparative example 1;
[0021] Figure 4is a schematic view of the structure of the disperser in Comparative Example 2.
[0022] Reference signs:
[0023] 1, tail coal injection end; 2, conical cylindrical body; 3, small end pulverized coal inlet; 4, large end pulverized coal outlet; 5, partition plate. DETAILED DESCRIPTION
[0024] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clear and obvious, the utility model is further described in detail in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model. The technical solutions of the utility model are described in detail below in combination with embodiments and drawings, but the protection scope is not limited by this.
[0025] Example 1
[0026] Referring to Figure 1 and Figure 2 , the embodiment provides a cement kiln decomposing furnace coal injection combustion device, which comprises a tail coal injection end 1; the tail coal injection end 1 is of a cylindrical structure; a disperser is arranged in the tail coal injection end 1; the disperser comprises a conical cylindrical body 2; the top and bottom of the conical cylindrical body 2 are both open structures; the top of the conical cylindrical body 2 is a small end pulverized coal inlet 3, and the bottom of the conical cylindrical body 2 is a large end pulverized coal outlet 4; the small end pulverized coal inlet 3 is located on the inner side of the tail coal injection end 1, and the large end pulverized coal outlet 4 is close to the outlet side of the tail coal injection end 1; five partition plates 5 are uniformly arranged on the inner wall of the large end pulverized coal outlet 4.
[0027] The tail coal injection end 1, the conical cylindrical body 2 and the partition plate 5 are all made of steel; the steel used in the embodiment is Gr25Ni20; the thickness is 15 mm, and the steel has the properties of high temperature resistance and wear resistance. The contact position between the outer wall of the conical cylindrical body 2 and the inner wall of the tail coal injection end 1 is welded.
[0028] One end of the partition plate 5 is welded to the inner wall of the conical cylindrical body 2, the other end of the partition plate 5 is welded to the side wall of the adjacent partition plate 5, and a regular pentagonal structure is formed in the conical cylindrical body 2; the inside of the regular pentagonal structure is a solid structure.
[0029] The geometric center of the regular pentagonal structure coincides with the geometric centers of the conical cylindrical body 2 and the tail coal injection end 1.
[0030] In the embodiment, the height of the conical cylindrical body 2 is 100 mm; the small end pulverized coal inlet 3 and the large end pulverized coal outlet 4 of the conical cylindrical body 2 are both circular.
[0031] The diameter of the large end pulverized coal outlet 4 is 120 mm; the diameter of the small end pulverized coal inlet 3 is 50 mm.
[0032] The height of the partition plate 5 is 1 / 3 of the height of the conical cylindrical body 2.
[0033] In use, the coal powder enters the tail coal injection end 1 and is sequentially injected out through the small-end coal powder inlet 3 and the large-end coal powder outlet 4. In the process of injection, the coal powder is injected out from the five paths formed between the five partition plates and the conical cylindrical body 2, and the conical structure and the internal partition plate form a dispersion effect with a rotational direction, effectively improving the uniform dispersion effect of the coal powder.
[0034] Comparative Example 1
[0035] Referring to Figure 3 , the present comparative example provides a cement kiln decomposing furnace coal injection combustion device, which is different from Example 1 in that the partition plate 5 is four, forming a quadrilateral structure, and the rest of the structure and the material are the same.
[0036] Comparative Example 2
[0037] Referring to Figure 4 , the present comparative example provides a cement kiln decomposing furnace coal injection combustion device, which is different from Example 1 in that the partition plate 5 is six, forming a regular hexagonal structure, and the rest of the structure and the material are the same.
[0038] Comparative Example 3
[0039] The present comparative example provides a cement kiln decomposing furnace coal injection combustion device, which is different from Example 1 in that the conical cylindrical body 2 is removed, and the five partition plates are directly welded with the inner wall of the tail coal injection end 1, and the rest of the structure and the material are the same.
[0040] Experimental Example 1
[0041] The cement kiln decomposing furnace coal injection combustion devices of Example 1 and Comparative Examples 1-3 are used to cooperate with the existing decomposing furnace for coal injection combustion:
[0042] Example 1: The decomposing furnace has stable pressure and stable control flexibility, stable reaction sensitivity, and no coal powder explosion phenomenon. After using the device, the kiln decomposition rate is 96%, the clinker three-day compressive strength is 33 MPa, the head coal consumption is 8.4 t / h, the kiln heat load is reduced, the refractory bricks are effectively protected, and the system is safely operated.
[0043] Comparative Example 1: The pre-kiln decomposition rate is 82%, the clinker three-day compressive strength is 28 MPa, and the head coal consumption is 9.6 t / h.
[0044] Comparative Example 2: The pre-kiln decomposition rate is 92%, the clinker three-day compressive strength is 30 MPa, and the head coal consumption is 9.2 t / h.
[0045] Comparative Example 3: pre-kiln decomposition rate 85%, clinker three-day compressive strength 28.6 MPa, head coal consumption 9.3 t / h.
[0046] 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 the above. 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 scope of patent protection determined by the submitted claims of the present application.
Claims
1. A coal injection combustion device for a cement kiln decomposing furnace, comprising a tail coal injection end (1); characterized in that, The tail coal injection end (1) is internally provided with a disperser; the disperser comprises a conical cylindrical body (2); the top and bottom of the conical cylindrical body (2) are open structures; the top of the conical cylindrical body (2) is a small-end coal powder inlet (3), and the bottom of the conical cylindrical body (2) is a large-end coal powder outlet (4); the small-end coal powder inlet (3) is located inside the tail coal injection end (1), and the large-end coal powder outlet (4) is close to the outlet side of the tail coal injection end (1). The inner wall of the large-end coal powder outlet (4) is uniformly provided with five baffle plates (5), one end of the baffle plate (5) is fixedly connected with the inner wall of the conical cylindrical body (2), the other end of the baffle plate (5) is fixedly connected with the side wall of the adjacent baffle plate (5), and a regular pentagon structure is formed in the conical cylindrical body (2); the inside of the regular pentagon structure is a solid structure.
2. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, The tail coal injection end (1) is in a cylindrical structure.
3. A coal injection burner for a cement kiln precalciner according to claim 1 or 2, characterised in that, The tail coal injection end (1) is made of steel.
4. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, The conical cylindrical body (2) and the baffle plate (5) are both made of steel.
5. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, One end of the five baffle plates (5) is welded with the inner wall of the conical cylindrical body (2).
6. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, The geometric center of the regular pentagon structure coincides with the geometric center of the conical cylindrical body (2) and the tail coal injection end (1).
7. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, The height of the conical cylindrical body (2) is 100-150mm; the small-end coal powder inlet (3) and the large-end coal powder outlet (4) of the conical cylindrical body (2) are both circular.
8. A coal injection burner for a cement kiln precalciner according to claim 7, characterised in that, The diameter of the large-end coal powder outlet (4) is 100-120mm; the diameter of the small-end coal powder inlet (3) is 40-60mm.
9. A coal injection burner for a cement kiln precalciner according to claim 7, characterised in that, The height of the baffle plate (5) is 1 / 3-1 / 2 of the height of the conical cylindrical body (2).
10. A coal injection burner for a cement kiln precalciner according to claim 1, characterised in that, The contact between the outer wall of the conical cylindrical body (2) and the inner wall of the tail coal injection end (1) is welded.