CN2811725Y

CN2811725Y - Reverse blow device for gas phase fluid pipeline

Info

Publication number: CN2811725Y
Application number: CN 200520114306
Authority: CN
Inventors: 房家贵; 李强
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-22
Filing date: 2005-07-22
Publication date: 2006-08-30
Anticipated expiration: 2015-07-22

Abstract

The utility model relates to a reverse blowing device for gas phase liquid pipelines, which belongs to the protection technical field of corrosivity gas phase liquid pipelines. The utility model comprises a branch pipe and a reverse blowing pipe which are communicated with a main pipeline. The utility model is characterized in that the branch pipe is sheathed with a reverse blowing distributing sleeve pipe which is communicated with the reverse blowing pipe, an annular cavity is formed between the reverse blowing distributing sleeve pipe and the outer wall of a branch pipe, and the outer wall of the branch pipe in the sleeve pipe is provided with through holes which are communicated with the annular cavity. The device eliminates the problem that the inner parts of lower branch pipes easily generate rotational flow causing corrosion by using original reverse blowing art through the improvement of the reverse blowing device for aiming at problems and shortages existing in existing reverse blowing art, a plurality of through hole structures on the pipe wall of the branch pipe can also effectively avoid the clogging of inner pipelines of reverse blowing systems caused by icing. The utility model can be used for the isolation and reverse blowing technical field of smoke gas pipeline sampling pipes, emptying pipes and other branch pipes, which contain acidic gases.

Description

Gaseous fluid pipeline inverse blowing device

Technical field

The utility model belongs to the guard technology field of corrosivity gaseous fluid pipeline, and the arm that relates in particular on a kind of gaseous fluid pipeline that prevents to contain solid particle is subjected to the inverse blowing device that burn into washes away or stops up.

Background technique

In petrochemical plant, particularly in the catalytic cracking unit, regenerative system carries out coke burning regeneration to the catalyzer that reacts back band oil coke, the sulphur that oil coke contains can produce sulfur dioxide, sulfur trioxide sulfides with oxygen reaction, wherein sulfur trioxide can be combined into sulfuric acid vapor with the water vapour in the flue gas, condense into sulfate liquid at low temperature (100～150 ℃) position, equipment is caused sour corrosion; Also contain a spot of nitrogen in addition in the oil coke, oxide and water vapor that the nitrogen reaction generates are combined into nitric acid vapor, nitric acid vapor is not strong in corrosivity more than 100 ℃, but as become nitric acid liquid in the following dewfall of dew point temperature (100～120 ℃), the sulfate liquid that had before condensed then has extremely strong corrosivity after mixing, and causes the dew point corrosion of equipment metal wall thus.Because dew point corrosion belongs to the uniformity corrosion, in case corrosion failure appears in the equipment outer wall, near the corrosion of metal wall layer also can be very serious, leak this moment in the flue gas of back as carrying tiny, hard catalyst granules again secretly, because swiftly flowing particle constantly washes away the leakage point tube wall, will cause leaking aggravation in short time, and then cause serious accident.Owing to above reason, in the catalysis device of the high sulfur-bearing heavy oil of processing, the low-temperature dew point corrosion problem of regenerative system equipment has become the subject matter that influences the safe operation of device long period, and the measure of having adopted at present is the material grade that adds insulating and wearing-resistant lining layer or lifting metallic conduit at the fume pipe inwall of regenerative system.

Generally because of arts demand, emptying and sampling arm are installed on the flue gas main pipe, the access mouth of pipe of these arms to the pipeline between the stop valve owing to there is a temperature drop, be that the easiest pipeline inner fluid medium that causes undergoes phase transition the position of corrosion, therefore compare, these arms are sensitive parts comparatively in the fume pipe, must take the necessary protection measure to resist the erosion of circulation medium.In addition, when the air-flow in the pipeline is entrained with such as solid particle objects such as catalyzer, easily in the mouth of pipe deposition of arm, and blocking pipeline gradually, influence is normally used.

Currently used arm guard technology mainly is a blowback wind isolation technology; promptly on the pipeline of drawing between arm and the valve, connect the reverse-blow pipe line; in arm, feed continuously and isolate with high-pressure air or high-temperature steam medium; the section of drawing at arm forms stable isolation airbond; constantly the gas that feeds is being kept the pressure difference balance in arm and the main pipe; make in the main pipe flowing medium seldom even can't enter in the arm; can play the anti-corrosion protection effect to arm; can prevent to add in the main pipe flue gas flow assorted solid particle again and enter arm, thereby protect arm effectively.There is significant disadvantages in the blowback wind technology that adopts at present: at first, the reverse-blow pipe air-flow that is blown into arm enters arm by a passage in some cases, be easy to form eddy flow, not only can not form airbond, make easier the entering in the arm of corrupt liquid in the main pipe on the contrary, and quickened the impact of corrupt liquid tube wall; Secondly, reverse-blow pipe is blown in the medium of arm the moisture that contains more or less, because the spacer medium self-temperature is lower, in the weather of cold, be blown into the easy condensation knot of the moisture in medium liquid in the arm, after liquid has mixed the acid medium scurried in the arm and catalyzer and has condensed into piece, being blown into of arm inner equilibrium medium will directly have been influenced, can stop up the access port of arm when serious, from present case, it is to influence the normal main cause of using of blowback wind that the blowback medium can't effectively play buffer action.

Also do not find the improvement of relevant inverse blowing device and technology and the solution of existing issue in external at present.

The model utility content

The purpose of this utility model provides a kind of gaseous fluid pipeline inverse blowing device, and this device can be eliminated the eddy flow problem in the arm, forms stable airbond.

Another purpose of the present utility model is to solve under the low situation of temperature, water in the arm and with the arm blocking problem.The technical solution adopted in the utility model is as follows:

A kind of gaseous fluid pipeline inverse blowing device, comprise the arm and the reverse-blow pipe that are connected with main pipe, it is characterized in that suit blowback wind distribution sleeve on the arm, distribution sleeve is connected with reverse-blow pipe, form toroidal cavity between blowback wind distribution sleeve and the arm outer wall, the arm outer wall in the sleeve pipe is offered the through hole that is connected with toroidal cavity.

The axis axial and arm of reverse-blow pipe is perpendicular.

Described through hole is square hole or circular hole.

The through hole of offering on the arm outer wall distributes along arm outer wall hoop.

All through-bore axis on the arm outer wall and arm axes intersect.

Through hole on the arm outer wall is along the axis symmetric arrays of arm.

The gas that blowback general mood source provides enters the annular that forms between Sealed casing pipe and the arm outer wall through reverse-blow pipe and distributes cavity, enter arm by the through hole on the arm outer wall equably, because all the air intake through holes on the Zhi Guanbi are for distributing symmetrically, and the direction of air intake and arm axes intersect (vertical or to the drawing-off mouth several angle that tilts a little), therefore can effectively avoid the generation of eddy flow.

Blowback wind enters annular and distributes cavity all to press, the uniform air flow that enters by each through hole intersects can form a very stable airbond, flue gas flow in the main pipe is difficult to enter arm, thereby stops in the arm after flue gas enters into airbond, causes the corrosion of valve and pipeline.

When under the lower situation of temperature, using, the liquid water that produces owing to the water vapor condensation in the reverse-blow pipe may be formed ice body in toroidal cavity, partial through holes is stopped up, but other through hole on the Zhi Guanbi still can satisfy the needs of blowing, makes inverse blowing device still can guarantee certain blowback effect.

The beneficial effects of the utility model are, this device is at the problem and the shortcoming that exist in the present blowback wind technology, thereby eliminated by the improvement of inverse blowing device and to have used original blowback wind technology lower branch line content to be prone to the problem that eddy flow causes corrosion, and also can effectively avoid the freezing obstruction of pipeline in the blowback wind system that causes of a plurality of through-hole structures on the Zhi Guanbi.This inverse blowing device can be widely used in the isolation blowback field of arms such as the various fume pipe probe tubes that contain sour gas, blow-down pipe.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further elaborated.

Fig. 1 is the utility model embodiment's a part section structural representation;

Fig. 2 is another embodiment's of the utility model a part section structural representation;

Fig. 3 is the another embodiment's of the utility model a part section structural representation;

Fig. 4 is the utility model part section structural representation of an embodiment again.

Embodiment

Embodiment 1 is as Fig. 1, on the regenerative system main pipe 1 of petroleum industry catalytic cracking unit, be connected with emptying arm 6, the tail end that connects main pipe at the emptying arm is set with blowback wind distribution sleeve 3, distribution sleeve 3 is connected with reverse-blow pipe 2, the two ends of distribution sleeve and 6 welding of emptying arm form toroidal cavity 5, offer a plurality of manholes 4 that distribute along arm outer wall hoop on the emptying Zhi Guanbi in sleeve closure.The air intake position and the through hole of reverse-blow pipe 2 are dislocatedly distributed, the pressed gas that reverse-blow pipe is blown into vertically enters toroidal cavity, through hole by annular spread after toroidal cavity is all pressed enters the blow-down pipe inner chamber uniformly, the airbond of formation and the equilibrium of main pipe internal pressure has effectively stopped entering of main pipe internal corrosion gas in blow-down pipe.

Embodiment 2 is as Fig. 2, a kind of gaseous fluid pipeline inverse blowing device, comprise the arm 6 and the reverse-blow pipe 2 that are connected with main pipe 1, suit blowback wind distribution sleeve 3 on the arm 6, distribution sleeve is connected with reverse-blow pipe, forms toroidal cavity 5 between blowback wind distribution sleeve and the arm outer wall, and the arm outer wall in the sleeve pipe is offered the square through hole 4 that is connected with toroidal cavity, at the other end of arm 6 pipe is installed and opens valve 7, be used for emptying or sampling control.

Embodiment 3 is as Fig. 3, a kind of gaseous fluid pipeline inverse blowing device that is used for sampling line, be connected with sampling bye-pass 6 on the gaseous fluid main pipe, suit blowback wind distribution sleeve 3 on the arm 6, distribution sleeve is connected with reverse-blow pipe 2, form toroidal cavity 5 between blowback wind distribution sleeve and the arm outer wall, arm outer wall in the sleeve pipe is offered the manhole 4 that is connected with toroidal cavity, the inverse blowing device of looping cavity part is connected with bye-pass with the form of flange, and dismounting and cleaning are more convenient.

Embodiment 4 is as Fig. 4, a kind of gaseous fluid pipeline inverse blowing device, comprise the arm 6 and the reverse-blow pipe 2 that are connected with main pipe 1, the other end of arm 6 is equipped with valve 7, the segmented pipeline of forming by the blowback wind distribution sleeve 3 of suit on arm, the arm with the form tipping of flange on arm, distribution sleeve is connected with reverse-blow pipe 2, forms toroidal cavity 5 between blowback wind distribution sleeve and the arm outer wall, and the arm outer wall in the sleeve pipe is offered the manhole 4 that is connected with toroidal cavity.

Claims

1, a kind of gaseous fluid pipeline inverse blowing device, comprise the arm and the reverse-blow pipe that are connected with main pipe, it is characterized in that suit blowback wind distribution sleeve on the arm, distribution sleeve is connected with reverse-blow pipe, form toroidal cavity between blowback wind distribution sleeve and the arm outer wall, the arm outer wall in the sleeve pipe is offered the through hole that is connected with toroidal cavity.

2, gaseous fluid pipeline inverse blowing device according to claim 1 is characterized in that the axis axial and arm of reverse-blow pipe is perpendicular.

3, gaseous fluid pipeline inverse blowing device according to claim 1 is characterized in that described through hole is square hole or circular hole.

4, gaseous fluid pipeline inverse blowing device according to claim 1 and 2 is characterized in that the through hole of offering on the arm outer wall distributes along arm outer wall hoop.

5, gaseous fluid pipeline inverse blowing device according to claim 4 is characterized in that through hole on the arm outer wall is along the central shaft symmetric arrays of arm.