A special-shaped tube for anti-contamination and anti-coking

A special-shaped tube, anti-coking technology, applied in the direction of tubes, rigid tubes, tubes/pipe joints/fittings, etc., can solve problems such as unsatisfactory effects, and achieve the effect of inhibiting coking tendency, increasing heat transfer effect, and reducing vertical impulse.

Active Publication Date: 2022-06-24
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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  • A special-shaped tube for anti-contamination and anti-coking
  • A special-shaped tube for anti-contamination and anti-coking
  • A special-shaped tube for anti-contamination and anti-coking

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 tube, and the radii of the small end and the big end of the drop 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 included angle α, and the longer the length L of the circumferential wall connecting the large and small ends, that is, L tends to H. like Figure 3c As shown in (III), the incident angle θ of the airflow at the position III of the connection region between the big and small ends Ⅲ The greater the pressure F acting perpendicular to the pipe wall Ⅲ垂 =Fcosθ Ⅲ The smaller is, the smaller the adhesion force produced by the impact, and the cutting force F produced by the impact along the pipe wall surface Ⅲ切 =Fsinθ Ⅲ The larger the value, the ratio of the two is used as γ=F Ⅲ切 / F Ⅲ垂 =tgθ Ⅲ As a measure of the airflow air knife effect coefficient, the larger the γ, the more obvious...

Embodiment 2

[0049] Special-shaped pipes include conical-semi-circular combined pipes, when such as figure 2 The small end of the dropper shown is transformed into a point, that is, when r=0, it evolves into a Figure 4 The windward surface shown is all conical, that is, the state of position III, which is defined as a conical-semi-circular combined pipe. The conical windward side has the smallest tendency to coke, i.e. Figure 4 The tube type shown is the best for anti-fouling and coking resistance. When H / R is larger, α is smaller, θ Ⅲ is larger, the wind knife effect coefficient γ=F Ⅲ切 / F Ⅲ垂 =tgθ Ⅲ The larger the value, the better the effect of inhibiting coking.

Embodiment 3

[0051] The special-shaped tube includes an oval tube, and the schematic diagram of the anti-fouling and anti-coking mechanism of the oval tube is as follows: Image 6 shown. The short and long radii of the 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 greater the pressure F acting perpendicular to the pipe wall Ⅱ垂 =Fcosθ Ⅱ The smaller is, the smaller the adhesion force produced by the impact, and the cutting force F produced by the impact along the pipe wall surface Ⅱ切 =Fsinθ Ⅱ The larger the value, the air knife effect coefficient γ=F Ⅱ切 / F Ⅱ垂 =tgθ Ⅱ The larger the value, the more obvious the anti-fouling and coking resistance. Compared with the round tube, the incident angle of the elliptical tube becomes larger, so the adhesion force generated by the impact ...

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Abstract

The invention discloses a stain-resistant and anti-coking special-shaped tube, which relates to the technical field of stain-resistant and anti-coking treatment, and uses drop-shaped tubes, conical-semicircle combined tubes, elliptical tubes, ellipse-semicircular combined tubes, ellipse-drop-shaped Special-shaped tubes such as combined tubes and tapered-drop-shaped combined tubes replace traditional round tubes, so that the smoke incident angle on the windward side increases rapidly from 0°, which is beneficial to the radial impact force F 垂 and tangential shear force F 切 distribution, both reducing F 垂 At the same time increase the F 切 , to achieve the purpose of reducing or even inhibiting fouling and coking. The invention can form "wind knife" internally, which can not only reduce the adhesion tendency, but also increase the blowing force, which is more helpful to improve the smoke flow field and increase the degree of turbulence, so as to weaken or suppress the tendency of coking; The "knife" is good for stain resistance and anti-coking, and can also increase the heat transfer effect.

Description

technical field [0001] The invention relates to the technical field of anti-contamination and anti-coking treatment, and more particularly relates to a special-shaped tube for anti-contamination 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 selecting high-quality coal that is not prone to contamination and coking, and washing with water to remove coking-prone components such as alkaline metals in the coal, it is necessary to adjust measures to local conditions. Measures such as blending non-coking coal with coking coal with a low proportion, adding bauxite and additives to make coke-prone components in the coal remain in the slag, and changing the boiler structure and process, etc. Coking coal. [0003] As my country's energy base, the coal reserves in Xinjiang are expected to be enough for China to use for 100 years. figure 1 Coking is shown, ...

Claims

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Application Information

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Patent Type & Authority Patents(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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