Novel efficient heat exchange low-pressure-loss preheater

Abstract

The utility model discloses a novel efficient heat exchange low-pressure-loss preheater which achieves the technical effects of reducing system resistance, improving separation efficiency and reducing C1 outlet temperature by increasing the height of a volute in a gradient mode, prolonging the length of an inner barrel in a proportion mode, optimizing the structure of an air inlet pipe and improving a material scattering device. The method is particularly suitable for energy-saving transformation of a 5000t / d cement clinker production line, and has the characteristics of low investment, quick effect, lasting effect and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement production equipment technical field, concretely relates to a novel high -efficient heat exchange low pressure loss preheater. BACKGROUND

[0002] In modern new dry cement production process, the cyclone preheater system is the key equipment of influencing system energy consumption. The traditional five stage preheater system generally exists following several technical bottlenecks:

[0003] Gas-solid separation efficiency is low: due to the unreasonable inner cylinder structure design, the inner cylinder length of existing cyclone is generally insufficient. Taking C1 cyclone as an example, the inner cylinder length of conventional design is usually in the range of 4.2-4.8 meters, which leads to insufficient residence time of raw material particles in the separation process, and the actual measured escape rate is as high as 5-7%. Especially when processing high alkali raw materials, the escape phenomenon is more serious.

[0004] System resistance is too large: the existing preheater system volute structure design has obvious defects. Through fluid dynamics analysis, it is found that the gas inlet mode of traditional volute can produce obvious turbulent effect. On the 5000t / d production line, the negative pressure of C1 outlet is usually-5000Pa to-5200Pa, which not only increases the fan energy consumption, but also limits the further improvement of system capacity.

[0005] Heat exchange is insufficient: the design defects of existing material distribution device lead to poor uniformity of raw material dispersion. The thermal test data shows that the material dispersion angle deviation of conventional material distribution box can reach ±15°, which reduces the gas-solid contact area and reduces the heat exchange efficiency. In actual operation of the production line, the C1 outlet temperature often exceeds 320℃, causing significant heat waste.

[0006] At present, the existing technology reduces resistance by increasing the diameter of cyclone, but does not optimize the collaborative structure of inner cylinder and volute, and still has the problem of high pressure loss. SUMMARY

[0007] In view of the problems and deficiencies in the prior art, the utility model provides a novel high -efficient heat exchange low pressure loss preheater.

[0008] The utility model technical scheme is as follows:

[0009] A novel high -efficient heat exchange low pressure loss preheater, including five stage cyclone (C1~C5), connecting pipe and discharging device;Wherein C1~C5 respectively indicates primary cyclone, secondary cyclone, tertiary cyclone, four stage cyclone, five stage cyclone.

[0010] The volute height of low pressure loss preheater C1 cyclone increases by 1.6%-1.8%, the inlet cross section extends outward in the shape of a horn, and double lock valve is arranged at the top.

[0011] The volute height of the low-pressure loss preheater C2-C5 cyclone is increased by 1.5-1.8%, 1.8-2.2%, 2.2-2.8%, 3-5% respectively, the column part height is shortened accordingly, and the inner cylinder length is extended by 8%, 9%, 9.6%, 10.3% respectively;

[0012] The inlet air pipe cross-sectional area of the low-pressure loss preheater C1-C5 cyclone is expanded by 10-15%, and the slope angle of the material scattering box bottom is 45-60°.

[0013] The total height of the low-pressure loss preheater C1 cyclone is 99300mm, and the ratio of the inner cylinder diameter to the cyclone diameter of the C1 cyclone is 0.4-0.5.

[0014] The inlet air pipe of the low-pressure loss preheater C1 cyclone is inclined downward by 10-15° to form a gradually expanding air flow channel.

[0015] The inner cylinder of the low-pressure loss preheater C2-C5 cyclone adopts a hanging plate type replaceable structure, and the hanging plate surface is coated with a wear-resistant ceramic layer.

[0016] The low-pressure loss preheater material scattering box adopts a stepped dispersion structure, and is provided with a flow guide protrusion at the bottom.

[0017] The outer wall of the low-pressure loss preheater cyclone is coated with a layer of nano thermal insulation material, and the thermal conductivity is ≤0.03W / (m·K).

[0018] The height of the low-pressure loss preheater C1 cyclone is 65-75m, the inner cylinder length is 4.5-5.5m, and the inlet air pipe cross-sectional area is 7-8.5m 2 ; the height of the C2 cyclone is 55-65m, the inner cylinder length is 4-4.8m, and the inlet air pipe cross-sectional area is 6.5-7.5m 2 ; the height of the C3 cyclone is 45-55m, the inner cylinder length is 3.8-4.5m, and the inlet air pipe cross-sectional area is 6-7m 2 ; the height of the C4 cyclone is 35-45m, the inner cylinder length is 3.5-4.2m, and the inlet air pipe cross-sectional area is 5.5-6.5m 2 ; the height of the C5 cyclone is 20-30m, the inner cylinder length is 3-3.8m, and the inlet air pipe cross-sectional area is 5-6m 2 .

[0019] The beneficial effects of the utility model are as follows:

[0020] The system resistance is greatly reduced: the measured data shows that the negative pressure at the outlet of the system C1 is stabilized in the range of -3800Pa to -4000Pa, which is reduced by more than 30% compared with the previous one. According to a 5000t / d production line, about 1.5 million degrees of electricity consumption can be saved per year.

[0021] Separation efficiency is significantly improved: the escape rate of raw material particles is reduced from 5.2% to less than 2.3%, greatly reducing the circulating load. Especially for fine particles with a particle size of less than 10 μm, the capture efficiency is increased by 40%.

[0022] Heat exchange effect is significantly improved: the C1 outlet temperature is reduced from 324℃ to 298℃, and the system thermal efficiency is increased by 3.5%. According to the annual production of 1.5 million tons of clinker, about 3000 tons of standard coal can be saved annually.

[0023] Running stability is enhanced: the improved material distribution device improves the uniformity of material distribution by 25%, and the system fluctuation amplitude is reduced by 50%, which provides a guarantee for stable operation of the production line. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure diagram of the embodiment;

[0025] The components represented by the reference numerals in the drawings are:

[0026] C1; 2, C2; 3, C3; 4, C4; 5, C5; 6, material distribution box DETAILED DESCRIPTION

[0027] The technical means adopted to achieve the predetermined invention purpose of the present application will be further described below in combination with the drawings in the embodiment of the present application.

[0028] EMBODIMENT

[0029] Referring to Figure 1 A new type of high-efficiency heat exchange low-pressure loss preheater, comprising five cyclones (C1-C5), connecting pipes and a discharging device.

[0030] The height of the volute of the low-pressure loss preheater C1 cyclone is increased by 1.6%-1.8%, the inlet cross-sectional area is extended outward in a trumpet shape, and a double-door air lock valve is arranged at the top. The heights of the volutes of the low-pressure loss preheaters C2-C5 cyclones are increased by 1.5%-1.8%, 1.8%-2.2%, 2.2%-2.8%, and 3%-5%, respectively, the heights of the column portions are shortened accordingly, and the lengths of the inner cylinders are extended by 8%, 9%, 9.6%, and 10.3%, respectively. The inlet pipe cross-sectional areas of the low-pressure loss preheaters C1-C5 cyclones are expanded by 10%-15%, and the bottom slope angle of the material distribution box 6 is 45°-60°.

[0031] The specific existing structure parameters of the five-stage preheater of the 5000t / d cement clinker production line are: the height of the C1 cyclone is 65-75m, the length of the inner cylinder is 4.5-5.5m, the inlet pipe cross-sectional area is 7-8.5m 2; the height of the C2 cyclone is 55-65m, the length of the inner cylinder is 4-4.8m, and the cross-sectional area of the inlet air pipe is 6.5-7.5m 2 ; the height of the C3 cyclone is 45-55m, the length of the inner cylinder is 3.8-4.5m, and the cross-sectional area of the inlet air pipe is 6-7m 2 ; the height of the C4 cyclone is 35-45m, the length of the inner cylinder is 3.5-4.2m, and the cross-sectional area of the inlet air pipe is 5.5-6.5m 2 ; the height of the C5 cyclone is 20-30m, the length of the inner cylinder is 3-3.8m, and the cross-sectional area of the inlet air pipe is 5-6m 2 .

[0032] In a specific embodiment, the structural parameters of the preheaters of the present application are as follows:

[0033] C1 cyclone

[0034] The volute height is increased by 1.7%, from 68.5m to 69.7m; the inlet cross-sectional area is expanded by 14%, and a downwardly inclined 12° horn-shaped gradual expansion design is adopted, with the cross-sectional area being increased from 7.2m 2 to 8.2m 2 ; the ratio of the inner cylinder diameter to the cyclone diameter is adjusted to 0.43 (inner cylinder diameter 3.2m, cyclone diameter 7.5m), and the inner cylinder length is extended from 4.8m to 5.3m; a double-channel air lock valve is configured at the top, and the sealing pressure is increased to 8kPa.

[0035] The distribution box 6 is a stepped distribution structure, with a bottom slope angle of 55° and a height of 15mm of a flow guide protrusion; the outer wall of the cyclone is coated with a layer of nano thermal insulation material (SiO2 aerogel, thickness 50mm, thermal conductivity coefficient 0.025W / (m·K)).

[0036] C3 cyclone

[0037] The volute height is increased by 2.0%, from 42.3m to 43.1m; the inner cylinder adopts a hanging plate type replaceable structure, and the hanging plate surface is coated with an Al2O3 ceramic layer (thickness 2mm, Mohs hardness 9); the inner cylinder length is extended by 9.6%, from 3.8m to 4.2m; the air pipe cross-sectional area is expanded by 12%, from 6.2m 2 to 6.9m 2 .

[0038] C4 cyclone

[0039] The inner cylinder adopts a 310S stainless steel + ceramic composite structure; the volute height is increased by 2.5%, from 38.2m to 39.1m; the distribution box 6 adopts a corrosion-resistant alloy material, and the slope angle is 50°.

[0040] C5 cyclone

[0041] The volute height is increased by 4.2%, from 24.6 m to 25.6 m; the inner cylinder length is prolonged by 10.3%, from 3.2 m to 3.5 m; the inlet pipe cross-sectional area is expanded by 13%, and a 30° bevel interface design is adopted; and the cylinder part height is correspondingly shortened by 1.2 m.

[0042] Through the above-mentioned embodiments, the system resistance is greatly reduced: the measured data shows that the negative pressure at the outlet of system C1 is stabilized in the range of -3800 Pa to -4000 Pa, which is reduced by more than 30% compared with the previous one. According to a 5000 t / d production line, about 1.5 million degrees of electricity consumption can be saved per year.

[0043] The separation efficiency is significantly improved: the escape rate of raw material particles is reduced from 5.2% to less than 2.3%, greatly reducing the circulating load. In particular, for fine particles with a particle size of less than 10 μm, the capture efficiency is increased by 40%.

[0044] The heat exchange effect is obviously improved: the outlet temperature of C1 is reduced from 324℃ to 298℃, and the system thermal efficiency is increased by 3.5%. According to an annual output of 1.5 million tons of clinker, about 3000 tons of standard coal can be saved per year.

[0045] The running stability is enhanced: the improved material distribution device improves the uniformity of material distribution by 25%, and the system fluctuation amplitude is reduced by 50%, which provides a guarantee for the stable operation of the production line.

[0046] Through the implementation of the above specific embodiments, the technical problems of low separation efficiency, large system resistance and insufficient heat exchange existing in the existing preheater system are successfully solved, and significant technical effects and economic benefits are achieved.

[0047] The above-mentioned is the preferred embodiment of the utility model, but the utility model is not limited to the above-mentioned embodiment and example, various changes, equivalent replacement, improvement, etc. made within the knowledge range of the person skilled in the art without departing from the inventive concept should be included in the protection range of the utility model.

Claims

1. A novel high-efficiency heat exchange and low-pressure-loss preheater, comprising a five-stage cyclone separator C1 to C5, connecting ducts, and a feeding device, characterized in that: The C1 cyclone separator has a volute height increased by 1.6%-1.8%, an inlet cross-sectional area that extends outward in a funnel shape, and a double-lock valve at the top. The volute height of cyclones C2 to C5 increases by 1.5%-1.8%, 1.8%-2.2%, 2.2%-2.8%, and 3%-5% respectively, while the height of the column section is correspondingly shortened, and the inner cylinder length is extended by 8%, 9%, 9.6%, and 10.3% respectively. The cross-sectional area of ​​the inlet duct of the C1 to C5 cyclones is increased by 10% to 15%, and the bottom slope angle of the material distribution box is 45° to 60°.

2. The preheater according to claim 1, characterized in that, The total height of the C1 cyclone is 99300mm, and the ratio of the inner cylinder diameter to the cyclone diameter is 0.4 to 0.

5.

3. The preheater according to claim 1, characterized in that, The inlet duct of the C1 cyclone is inclined downward at 10° to 15° to form a gradually expanding airflow channel.

4. The preheater according to claim 1, characterized in that: The inner cylinder of the C2 to C5 cyclone tubes adopts a replaceable hanging plate structure, and the surface of the hanging plate is coated with a wear-resistant ceramic layer.

5. The preheater according to claim 1, characterized in that: The material dispensing box adopts a stepped dispersion structure and has a flow guiding protrusion at the bottom.

6. The preheater according to claim 1, characterized in that: The outer wall of the cyclone is covered with a layer of nano-insulating material with a thermal conductivity of ≤0.03W / (m·K).

7. The preheater according to claim 1, characterized in that, The C1 cyclone separator has a height of 65-75m, an inner cylinder length of 4.5-5.5m, and an inlet duct cross-sectional area of ​​7-8.5m². 2 The C2 cyclone separator has a height of 55-65m, an inner cylinder length of 4-4.8m, and an inlet duct cross-sectional area of ​​6.5-7.5m². 2 The C3 cyclone separator has a height of 45-55m, an inner cylinder length of 3.8-4.5m, and an inlet duct cross-sectional area of ​​6-7m². 2 The C4 cyclone separator has a height of 35-45m, an inner cylinder length of 3.5-4.2m, and an inlet duct cross-sectional area of ​​5.5-6.5m². 2 The C5 cyclone separator has a height of 20-30m, an inner cylinder length of 3-3.8m, and an inlet duct cross-sectional area of ​​5-6m². 2 .

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