CN2213921Y

CN2213921Y - Antiseptic and anti-wear drivepipe of air pre-heater

Info

Publication number: CN2213921Y
Application number: CN94211449U
Authority: CN
Inventors: 马俊续
Original assignee: Lin Yanzhao
Current assignee: Lin Yanzhao
Priority date: 1994-05-13
Filing date: 1994-05-13
Publication date: 1995-11-29
Anticipated expiration: 2004-05-13

Abstract

The utility model belongs to an auxiliary device for the air preheater of a boiler pipe. The utility model relates to a special-shaped drivepipe which is matched with an air preheater and is used for preventing the air preheater from being corroded and abraded. The outer part of the drivepipe is provided with a T-shaped cylinder structure. That is to say, the upper end of the cylinder is provided with a step structure. The inlet at the upper end of the inner cavity structure of the drivepipe is provided with a contracted section structure. A convergent circular bench shape is formed, the upper part of the convergent circular bench shape is big, and the lower part of the convergent circular bench shape is small. The middle part of the inner cavity of the drivepipe is provided with a stationary flow section which forms a front circular pipe shape. The lower part of the inner cavity is provided with a flaring segment structure. A flaring circular bench shape is formed, the upper part of the flaring circular bench shape is small, and the lower part of the flaring circular bench shape is big. The utility model has the advantages of good anti-corrosive and anti-wear effects, little resistance, little abrasion, simple structure, convenient fabrication and manufacture, and easy disassembly and replacement.

Description

Antiseptic and anti-wear drivepipe of air pre-heater

The utility model belongs to the servicing unit that the seamless steel tube for boiler air gives hot device, relates generally to a kind of steel pipe air that is matched in and gives the special-shaped sleeve pipe of hot device in order to corrosion and wear.

Thereby it is to add the equipment that hot-air improves boiler thermal output with the stove exit gas that the seamless steel tube for boiler air gives hot device, usually the flue gas that contains soot particle is vertically mobile from top to bottom in air gives hot organ pipe with the flow velocity of 10～14m/s, air is crossed and is heated from pipe external series gap cross-current, when the flue gas that contains soot particle vertically flows through air and gives in the hot organ pipe, pipe import department certain position will produce comparatively serious erosive wear.

Present seamless steel tube for boiler air gives hot device and adopts opening inner sleeve abrasionproof anticorrosion more, this sleeve pipe adopts steel plate to roll or be stamped to form, rolled opening inner sleeve is directly squeezed into air to give in the hot device inlet tube and using, its product is lack of standardization, and easy deflection is installed, and heating surface pipe is washed away by the deflection plume, pipe still is subjected to heavy wear, therefore this sleeve pipe abrasionproof anticorrosion ability is undesirable, and resistance is big, and service life is short.

The purpose of this utility model is the anticorrosion corrosion protection sleeve pipe that proposes a kind of new structure, is used for the seamless steel tube for boiler air and gives hot device, and it can initiatively change the flow of flue gas direction, reaches good corrosion and wear effect.

Flue gas enters to have formed when the steel pipe air gives hot device entrance to shrink and expands air-flow, and when air-flow is full of a certain position, pipe back pipe for the first time maximum erosive wear will take place, the utility model promptly is the receipts expansion shape liquid form that gives hot device inducer flue gas according to air, change or limit the designed a kind of novel abrasionproof spare of former flow of flue gas route, it places and gives hot organ pipe upper end, inlet flue gas is played water conservancy diversion, current stabilization, separate the effect of soot particle, make wearing and tearing be created in sleeve pipe itself, under the situation that resistance does not increase or slightly increases, heating surface pipe is slowed down and wear and tear or do not wear and tear.

The utility model sleeve pipe profile is a T shape cylindrical structure, promptly one step is arranged in the cylinder upper end, give in the hot organ pipe and be positioned at its upper end in order to insert air, the top of cannula cavity is that the porch is a contraction section, form up big and down small cone cylinder body shape, the effect of contraction section is that steering current shrinks on request, soot particle under the effect of shrinking air-flow in the flue gas obtains separating under action of centrifugal force, soot particle major part after the separation will concentrate on the pipe center flow, and the flue gas that has been cleaned will flow along tube wall, thereby reach the purpose that heating surface pipe slows down wearing and tearing, contraction section shrinks coning angle≤30 °, the utility model cannula cavity middle part is the trunnion section for steady flow segment, be positive round tube shape, it makes ash-laden gas obtain current stabilization in this section, the through-flow diameter of steady flow segment is according to flue gas contraction smallest cross-sectional size and consider certain surplus and determine in pipe, steady flow segment length should be more than or equal to the through-flow diameter of steady flow segment, the bottom of the utility model cannula cavity is a divergent segment, ash-laden gas will enter divergent segment after steady flow segment obtains effect that current stabilization quickens, divergent segment becomes the gradually expanded form Rotary-table, its upper diameter is with steady flow segment diameter unanimity, the divergent segment lower diameter is slightly less than air and gives hot organ pipe internal diameter, angle of flare α≤10 °, make air-flow in process of expansion, not produce separation, to reduce resistance, dust constaining stream will obtain secondary separation by divergent segment to soot particle, most of soot particle still continues to flow along the pipe center line under the inertia force effect, isolated clean flue gas will flow along tube wall, because the current stabilization effect of sleeve pipe steady flow segment, soot particle is no longer expanded with the expansion of expansion air-flow under the effect of inertia force, and the air tube wear that gives hot device will alleviate greatly thus.

Because the utility model sleeve pipe selects for use the anticorrosive anti-wear material to make; change the principle that grey grit can obtain redistributing in the flue gas of back according to the flow of flue gas direction and adopt new structure; therefore this sleeve pipe has good corrosion and wear effect; resistance is little; not fouling, wearing and tearing extremely slight; by calculating, install this sleeve pipe additional after resistance increase 5mmH ₂O, test value is at 7～8mmH ₂In the o, air give hot device install this sleeve pipe additional after the life-span can prolong 1～2 times.

The utility model is simple in structure, is convenient to processing and with low cost, easily dismounting.

Accompanying drawing 1 is the utility model sleeve structure schematic diagram.

Accompanying drawing 2 is the utility model user mode schematic diagram.

Structure as shown in drawings, the utility model sleeve pipe profile is a T shape cylinder, one step 2 is promptly arranged in the cylinder upper end, give in the hot organ pipe 5 and be positioned at its upper end in order to insert air, 6 give hot device upper spacer for air, the upper end of cannula cavity is that the porch is a contraction section 1, its taper angle α≤30 °, form up big and down small convergent Rotary-table, the length of contraction section Rotary-table is 0.4～0.6 of the through-flow diameter of middle part steady flow segment, the cannula cavity middle part is positive circular tube structure for steady flow segment 3 is the trunnion section, and steady flow segment length should be more than or equal to the through-flow diameter of steady flow segment, the divergent segment 4 of cannula cavity bottom is up-small and down-big flaring cone cylinder body shape, the divergent segment upper diameter is with steady flow segment diameter unanimity, and the divergent segment lower diameter is slightly less than air and gives hot organ pipe internal diameter, angle of flare α≤10 °.

Claims

1, air gives hot device corrosion and wear sleeve pipe, it is characterized in that: profile is a T shape cylinder, be that the cylinder upper end has a step (2), the upper end of cannula cavity is that the porch is contraction section (1), form up big and down small convergent cone cylinder body shape, the cannula cavity middle part is the steady flow segment (3) of positive tubular, and the cannula cavity bottom is divergent segment (4), form up-small and down-big flaring cone cylinder body shape, the divergent segment upper diameter is with steady flow segment diameter unanimity.

2, air according to claim 1 gives hot device corrosion and wear sleeve pipe, it is characterized in that: the contraction coning angle of cannula cavity contraction section (1) can be selected in≤30 °.

3, air according to claim 1 gives hot device corrosion and wear sleeve pipe, it is characterized in that: angle of flare α≤10 of cannula cavity bottom divergent segment (4) °.