CN85105967A

CN85105967A - Erosion resistant waterwall

Info

Publication number: CN85105967A
Application number: CN85105967.8A
Authority: CN
Inventors: 理查德·C·约翰逊; 利·B·埃格伯特
Original assignee: Foster Wheeler Energy Corp
Current assignee: Foster Wheeler Energy Corp
Priority date: 1985-08-08
Filing date: 1985-08-08
Publication date: 1987-02-25
Also published as: CN1006934B

Abstract

A kind of erosion resistant waterwall has many anti-erosion pin spares to be attached on the exposed surface of waterwall on it, waterwall then is made up of marine riser between linking together with many continuous fins.Pin spare makes that with respect to the size of pipe many pin spares can be protruding around the exposed surface of each pipe at certain intervals by the direction perpendicular to each tube axis.Pin spare can take the form of steel ball or small column to be attached on the exposed surface, can put a ceramic sleeve in the periphery of column.

Description

Erosion resistant waterwall

The present invention relates to a kind of waterwall, particularly relate to a kind of waterwall with the surface that can resist the particulate matter erosion.

In industrial process, most corrode process elbow, threeway, separator, widely different rotating vane sheets etc. such as betiding abrasive particulate material such as coal, catalyzer, sand, petroliferous shale, limestone and when changing its flow direction.Erosion is that the abrasive particulate material that a large amount of speed to change is moved carries out the result that acute angle clashes into.

Once invent multiple systems and resisted this erosion.For example, cement-bonded or phosphate bonded integral body can be cast (and plastic) refractory material and be fixed on the staggered bow member of about two English inch or four English inch or the method on the hexagon steel grating, be used for resisting above-mentioned erosion by the steel bolt.Also once be installed on the fixture of V-arrangement rod or S shape rod with the thick above-mentioned refractory material that reaches a little English inch, and if corrode fierce especially, also with the refractory material that gives burning, and usually with its with dowel fixes on steel structure.

But the application of these refractory materials has increased thermal conductivity, and this situation for example in boiling furnace, has a strong impact on the thermal absorptivity of tube surface in many systems.

The back-up system that has been found that a kind of steel more can be resisted erosion than the cement-bonded monoblock castable refractory that most above-mentioned tradition are used for the dowel fixes wall system.But if the wall that this pipe surrounds only is designed to the thickness of steel is increased, the increase of weight and expense may be played inhibitory action to application.

Therefore one object of the present invention just provides a kind of waterwall, and it can resist the thermal absorptivity that erosion does not influence waterwall again.

Another object of the present invention provides a kind of erosion resistant waterwall of the above-mentioned type, and it does not increase weight and the expense so that the influence use of system.

Another purpose of the present invention provides a kind of erosion resistant waterwall, and its metal covering thickness increases as required selectively in the local area that waterwall is easy to corrode.

In order to reach these purposes, waterwall characteristics of the present invention are, utilize many erosion-resistant pin spares, are contained on the exposed surface of waterwall, arrange by certain spaced relationship along waterwall.Pin spare is with respect to the size of waterwall pipe, should be able to make that some pins can be along the circumference of every pipe exposed surface, and launch perpendicular to the axis of every pipe.

With reference to following to preferable and embodiment's detailed description intuitively of the present invention, more in conjunction with the accompanying drawings, can be to above-mentioned brief explanation, and other purposes of the present invention, characteristics and advantage have the understanding of filling part, wherein:

Fig. 1 is the part front view of traditional waterwall of not handling by the present invention;

Fig. 2 is the sectional view along the 2-2 line of Fig. 1, the part waterwall surface after the processing according to the present invention of drawing;

Fig. 3 is similar with Fig. 2, but depicts another embodiment of the present invention;

Fig. 4 and Fig. 5 are respectively plan view and the front views that is used for Fig. 3 embodiment's a pin spare;

Fig. 6 is similar with Fig. 2, but represents another embodiment of the present invention;

Fig. 7 is the plan view of used pin spare among Fig. 6 embodiment;

Fig. 8 is that the pin of Fig. 7 is welded on the waterwall with the vertical sectional view before forming assembly shown in Figure 6 at it.

With reference to accompanying drawing 1, the traditional waterwall before label 10 expressions are improved according to the present invention.This waterwall is by many parallel to each other and at regular intervals, forms along the water pipe 12 of the length extending of wall.Every pipe 12 relative extends radially out a pair of continuous fin 14 along it.Each fin 14 forms airtight construction along its side weld on the respective surfaces of adjacent pipe 12.

Fig. 2 is illustrated in a pipe 12 and under the situation of its two fins 14 that stretch out, the part surface of waterwall 10 is exposed to the situation under the hot particulate matter effect.According to the present invention, the nail of many steel ball 16 shapes is arranged along the exposed surface of pipe 12 and fin 14 at regular intervals.Steel ball 16 is with respect to the size of pipe 12, make many steel balls can along perpendicular to the direction of tube axis at each tube surface, arrange around its periphery at regular intervals.The conventional welding manner of steel ball 16 usefulness is fixed on the outer surface of pipe 12 and fin 14.

According to the embodiment of Fig. 3 to 5, what stretch out on the outer exposed surface of pipe 12 and fin 14 is the pin spare of solid cylinder 18 shapes.As shown in Figure 5, stretch out a bump body 20 in the bottom of pole piece 18, it melts away on the exposed surface that pole piece is welded in pipe 12 and fin 14 time.

According to the embodiment of Fig. 6, pin spare is surrounded with the wide tube 24 of pottery by column center piece 22 and makes.Center piece 22 stretches out bump 22a from ceramic sleeve 24 belows, melts away when pin spare being welded on the exposed surface of pipe 12 and fin 14.Therefore the function of center piece 22 is that ceramic sleeve is fixed on position shown in Figure 6, just provides the pin spare that the steel material will comprise ceramic sleeve 24 in addition and is welded on the outer exposed surface of pipe 12 and fin 14.

Certainly, except Fig. 6 embodiment's ceramic sleeve, the most handy steel of pin spare among aforementioned each embodiment is done, because of it is welded on the exposed surface of above-mentioned waterwall 10.

Though at Fig. 2, only express a pipe 12 and corresponding fin 14 thereof in 3 and 6, much less, pin spare can be stretched on the whole exposed surface of waterwall as required.

According to desirable embodiment, the diameter of each pipe at least should be bigger five times than the diameter of pin part, and the spacing of adjacent pin spare should be 1/4th English inch to English inch.For example, when the diameter of each pin spare was half English inch, the diameter of pipe 12 should be three English inch, and these sizes can change with different designs certainly.

Setting of the present invention has multiple advantages.For example, the pin spare in the various embodiments described above is formed irregularly shapedly to be run foul of each other abrasive particle or departs from main structure, thereby has disperseed abrasive Flow and reduced it to corrode potentiality.The very near pin spare of distance can have been protected the basic steel that the strong erosion zone of action is arranged to play the effect of abrasive particulate material trap completely mutually.

The acquisition of all above-mentioned advantages does not significantly reduce the thermal absorptivity of waterwall, very is adapted at spot repair and the installation in obvious high erosion ratio zone. Certainly, according to the present invention, if heat exchange is not the factor that will consider, the aluminate or phosphate of medium anti-erosion degree can be filled to have in the space between the pin spare, make it be bonded to monoblock, in the equipment in every year operation stand-down, as required it is changed.

Claims

1, a kind of waterwall comprises many water pipes parallel to each other and that stretch by determining deviation; Manyly be stretched in fin between the adjacent water pipe along total length continuously, they connect to form a kind of airtight construction with the outer surface of above-mentioned pipe, a surface of this structure is exposed under the erosion of abrasive particulate material, and many anti-erosion pin sheets that are attached to the above-mentioned exposed surface of said structure, these pin spares are with respect to the size of above-mentioned pipe, and the exposed surface that makes many such pin spares can center on each pipe by the direction compartment of terrain perpendicular to each tube axis stretches out.

2, according to the waterwall of claim 1, each pin spare takes the form of steel ball to be welded in above-mentioned exposed surface thereon.

3, according to the waterwall of claim 1, each pin spare is taked the form of elongation column partly thereon.

4,, also comprise one around above-mentioned column and the above-mentioned ceramic sleeve partly that stretches out according to the waterwall of claim 3.

5, according to the waterwall of claim 3 or 4, wherein above-mentioned pin spare is fixed on the above-mentioned surface with welding method.

6,, wherein above-mentionedly stretch out partly that at least some melt away in above-mentioned welding process according to the waterwall of claim 5.

7, according to the waterwall of claim 2 or 3, wherein the diameter of each above-mentioned pipe is bigger five times than the diameter of above-mentioned pin spare at least.

8, according to the waterwall of claim 2 or 3, wherein the diameter of each above-mentioned pipe is approximately 3 inches, and the diameter of each above-mentioned pin spare is approximately half inch.