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Stain-resistant and anti-coking special-shaped pipe

A special-shaped tube and anti-coking technology, applied in the direction of tubes, rigid tubes, tubes/pipe joints/fittings, etc., can solve problems such as unsatisfactory effects, achieve weakening or inhibiting coking tendency, increase heat transfer effect, and increase turbulence degree Effect

Active Publication Date: 2020-12-18
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second solution is to use composite pipes, but the search for stain-resistant and anti-coking materials is the bottleneck. According to Japanese information, nickel-based coatings are used, but the effect is not satisfactory.

Method used

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  • Stain-resistant and anti-coking special-shaped pipe
  • Stain-resistant and anti-coking special-shaped pipe
  • Stain-resistant and anti-coking special-shaped pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] combine figure 2 , the round tube of the special-shaped tube is changed to a drop-shaped tube, and the radii of the small end and the large end of the drop-shaped tube are r and R respectively. When the R-r difference is constant, the larger the distance H between the large and small ends, the smaller the angle α, and the longer the length L of the circumferential pipe wall connecting the large and small ends, that is, L tends to H. Such as Figure 3c As shown in (Ⅲ), the airflow incident angle θ at position Ⅲ of the connection area between the large and small ends Ⅲ The larger the pressure F acting vertically on the pipe wall Ⅲ垂 =Fcosθ Ⅲ The smaller the is, the smaller the adhesion generated by the impact is, and the cutting force F generated by the impact along the pipe wall surface Ⅲ切 =Fsinθ Ⅲ is larger, then use the ratio of the two γ=F Ⅲ切 / F Ⅲ垂 =tgθ Ⅲ As a measure of the airflow knife effect coefficient, the larger the γ, the more obvious the effect of ant...

Embodiment 2

[0049] Special-shaped pipes include conical-semicircular combined pipes, when such as figure 2 When the small end of the shown dropper becomes a point and that is when r=0, then it evolves into Figure 4 The windward surfaces shown are all conical, that is, the state of position III, which is defined as a conical-semicircular combined pipe. The coking tendency on the windward side of the cone is the smallest, that is, Figure 4 Tube types shown are most favorable for stain and coking resistance. When H / R is larger, that is, α is smaller, θ Ⅲ The bigger it is, the wind knife effect coefficient γ=F Ⅲ切 / F Ⅲ垂 =tgθ Ⅲ The larger it is, the better the effect of inhibiting coking.

Embodiment 3

[0051] Special-shaped tubes include elliptical tubes, and the schematic diagram of the anti-staining and anti-coking mechanism of elliptical tubes is as follows Figure 6 shown. The short and long radii of an elliptical tube are r and R, respectively. When R-r is larger, the transition from position Ⅰ to position Ⅳ, that is, from the long axis to the short axis, is smoother, such as Figure 7b As shown in (II), the airflow incident angle θ at position II Ⅱ The larger the pressure F acting vertically on the pipe wall Ⅱ垂 =Fcosθ Ⅱ The smaller the is, the smaller the adhesion generated by the impact is, and the cutting force F generated by the impact along the pipe wall surface Ⅱ切 =Fsinθ Ⅱ The larger it is, the wind knife effect coefficient γ=F Ⅱ切 / F Ⅱ垂 =tgθ Ⅱ The larger it is, the more obvious the anti-staining and anti-coking. Compared with the round tube, the incidence angle of the elliptical tube becomes larger, so the adhesion force generated by the impact becomes sm...

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Abstract

The invention discloses a stain-resistant and anti-coking special-shaped pipe, and relates to the technical field of stain-resistant and anti-coking treatment. Traditional circular pipes are replacedwith special-shaped pipes, such as a drop-shaped pipe, a conical-semicircular combined pipe, an elliptical pipe, an elliptical-semicircular combined pipe, an elliptical drop-shaped combined pipe and aconical drop-shaped combined pipe, so that the incident angle of smoke on the windward side is rapidly increased from 0 degree, thereby benefiting distribution of the radial impact force F < vertical> and tangential shear force F < tangential > ; and the F < vertical > is reduced, and meanwhile the F < tangential > is increased, so that the purposes of weakening and even avoiding contamination and coking are achieved. According to the special-shaped pipe, "air knife " can be internally formed; not only can the adhesion tendency be reduced, but also the blowing force is increased; the improvement of a smoke flow field is benefited, and the turbulence degree is increased, so that the purpose of weakening or inhibiting the coking tendency is achieved; and the air knife is formed in the special-shaped pipe, thereby benefiting stain resistance and anti-coking, and the heat transfer effect can be further improved.

Description

technical field [0001] The invention relates to the technical field of stain-resistant and anti-coking treatment, and more specifically refers to a special-shaped pipe for stain-resistant and anti-coking. Background technique [0002] Contamination and coking is a worldwide problem in the use of fossil fuels, especially in the coal-fired industry. In addition to the traditional preferred solutions such as selecting high-quality coal that is not prone to contamination and coking, and washing with water to remove easily coked components such as alkaline metals in coal, we should adapt measures to local conditions Taking measures such as blending non-coking coal with a low proportion of coking coal, adding bauxite and additives to make the coking components in the coal remain in the slag, changing the boiler structure and process, and rationally utilizing lignite and other easy-to-coke components to a certain extent Coking coal. [0003] As my country's energy base, the coal r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/00F23J3/02
CPCF16L9/006F23J3/02
Inventor 张清廉翟国丽
Owner BAOSHAN IRON & STEEL CO LTD
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