CN205152256U - Converter end section flue high reliability vaporization cooling tedge - Google Patents

Abstract

The utility model discloses a converter end section flue high reliability vaporization cooling tedge, be responsible for including end section flue, tedge branch pipe, tedge, end section flue is provided with the solid matter pipe, the tedge is responsible for through the solid matter pipe intercommunication of tedge branch pipe with end section flue, tedge branch pipe axis is responsible for centraxonial steam flow direction of connection contained angle alpha with the tedge and is less than 90, with the linkage segment that tedge branch pipe (2) of (3) intercommunication were responsible for to the tedge is less than 90 rather than the centraxonial steam flow angular separation beta of adjacent section. The utility model discloses an it is responsible for rather than an intervascular contained angle and an intertube contained angle to reduce the tedge to reducing the flow resistance of medium in the tedge, stoping or the emergence of reduction end section flue separation of two -phase fluid phenomenon, the cooling effect of reinforcing end section flue solid matter cooling tube reduces the heat fatigue of solid matter cooling tube, reaches the purpose that reduces converter end section flue and frequently leak, have simple structure, with low costs, subtract the characteristics of leaking the effect and showing.

Description

A kind of converter latter end flue high reliability elaporative cooling tedge

Technical field

The utility model belongs to converter smelting technical field, relates to that a kind of structure is simple, cost is low, subtracts the converter latter end flue high reliability elaporative cooling tedge leaking Be very effective.

Background technology

The essence of converter vapourization cooling system is flue type waste heat boiler.Its effect utilizes recirculated water heat exchange that the heat of converter gas is converted to steam, thus reach the object to flue gas cool-down cooling.Usually from converter, upper movable gas hood, fixed section flue, flue collector 1 section, flue collector 2 sections and the latter end flue of being divided into respectively is formed gasification cooling flue.Each section of flue welds solid matter by boi1er tube with band steel and forms, and recirculated water low in and high out in the close arranging pipe of flue, moves in circles.

The safe and stable operation of converter evaporation cooling air flue ensures by one of essential condition of the converter stable yields of its cooling, natural labor.Because converter evaporation cooling air flue restricts by Various Complex factor, therefore flue leaks is the most common, the most scabrous problem existed during flue is safeguarded, seriously have impact on the work-ing life of flue, not only can waste a large amount of soft water resources, but also stopping production or the underproduction of converter can be caused, serious leaking also can cause following problem: the steam of generation increases the air quantity excessively of flue, and the excessive formation of flue gas may be caused to pollute; Affect the recovery rate of coal gas and the utilization of flue residue heat; Safety in production is threatened.Particularly in production run, often there is leak source in latter end flue, even if often soldering also (Fig. 1) of no avail.

It is produce transverse crack, along with crackle point adds up just to show to time to a certain degree by the boiler weldless steel tube water pipe of solid matter that latter end flue frequently leaks.According to General Maintenance Knowledge, the transverse crack on gasification cooling flue generally because of heat pipe cooling performance not good after occur caused by thermal fatigue.Because gasification cooling flue is intermittent type operation, during Converter Oxigen Blowing, exhaust gas volumn is in maximum, flue-gas temperature also reaches the highest, and thermal load increases, and pipe surface temperature raises, during blow off, amount of flue gas emission drops to zero, thermal load reduces, and pipe surface temperature is rapid drawdown thereupon, makes heat pipe produce periodic alternating thermal stress, very easily causing Under Thermal Fatigue Damage, is therefore the major reason that transverse crack appears in close arranging pipe.In addition, because carburetion system other section of flue recirculated water loop direction is consistent with flow of flue gas direction, be low in and high out, the cigarette temperature that namely recirculated water is contacted more backward is lower; And latter end flue due to its function special, the low in and high out of recirculated water loop direction, flue gas then high in and low out, so just makes the cigarette Wen Yuegao that recirculated water is contacted more backward.Therefore, namely thermosetting steam water interface is added by high-temperature flue gas after recirculated water enters latter end flue, then along with the rising of cigarette temperature, recirculated water continues vaporization thus constantly produces a large amount of steam, so that after recirculated water arrives the flat segments of latter end flue, because action of gravity forms separation of two, namely heavier depositing in water is to the bottom of water cooling tube. and steam then floats over water cooling tube top.Cooling is not enough so just to cause inner arc side flat segments water cooling tube to occur because of lack of water, and then thermal fatigue produces transverse crack, finally causes this region frequently to leak.Therefore medium flow is the basic reason causing flue to leak to the separation of two caused.

In order to solve converter evaporation cooling air flue, the particularly seepy question of end flue, generally takes pump circulation to improve flue heat exchange face water-cooled intensity, thus avoids flue overheated and endurance failure leakage.But because the intermittent type of converter is smelted, blowing peak time exhaust gas volumn sharply increases, flue inner wall is heated and is made refrigeration cycle water pressure local raise too fast, and the instantaneous swelling pressure are greater than circulating pressure and can cause the stagnant resistance in local; In addition, during oxygen blast, the change of blowing oxygen quantity also can cause the change of exhaust gas volumn and flue-gas temperature, also can cause fluctuation to circulating cooling hydraulic pressure; And amount of flue gas emission drops to zero during blow off, thermal load reduces, and pipe surface temperature is rapid drawdown thereupon, and circulating cooling hydraulic pressure declines thereupon.Therefore, the simple cyclic hydrostatic pressure that improves can cause hydraulic pressure to impact owing to smelting oxygen blast, thus makes heat pipe produce periodic alternating thermal stress, very easily causes thermal fatigue to leak and even booster.

Utility model content

The purpose of this utility model is to provide that a kind of structure is simple, cost is low, subtract the converter latter end flue high reliability elaporative cooling tedge leaking Be very effective.

The purpose of this utility model realizes like this, comprise latter end flue, riser leg, upcast supervisor, described latter end flue is provided with close arranging pipe, described upcast supervisor is communicated with by the close arranging pipe of riser leg with latter end flue, the steam flow direction that described riser leg axis and upcast are responsible for axis is connected angle α and is less than 90 °, and the steam flow angular separation β being responsible for the linkage section section of the being adjacent axis of the riser leg be communicated with described upcast is less than 90 °.

The utility model is by reducing the angle of upcast supervisor and its arm and reducing angle between arm, thus reduce the resistance to flow of upcast supervisor level arm medium, increase the strength of turbulence of the secret comb medium of latter end flue, stop or weaken the generation of latter end flue separation of two phenomenon, strengthen the cooling performance of latter end flue solid matter cooling tube, reduce the thermal fatigue strength of solid matter cooling tube, reach and reduce converter latter end flue and frequently to leak, improve the object of latter end flue evaporated cooling system reliability.Therefore, the utility model has the advantages that structure is simple, cost is low, subtract leakage Be very effective.

Accompanying drawing explanation

Fig. 1 is existing latter end flue structure schematic diagram;

Fig. 2 is Fig. 1 left view;

Fig. 3 is one of the utility model structural representation;

Fig. 4 is Fig. 3 left view;

In figure: 1-latter end flue, 10-flue gas flow direction, 11-leaks region, 2-riser leg, 20-arm linkage section, 21-arm medium flow to, 22-arm one, 23-arm two, 24-arm three, 25-arm four, 26-arm five, 27-arm six, 28-arm seven, 29-arm eight, 3-upcast is responsible for, 30-is responsible for medium flow to, 4-drum.

Embodiment

Be further described the utility model below in conjunction with accompanying drawing, but must not be limited the utility model by any way, any change done based on the utility model training centre or improvement, all belong to protection domain of the present utility model.

As shown in Figures 3 and 4, the utility model comprises latter end flue 1, riser leg 2, upcast supervisor 3, described latter end flue 1 is provided with close arranging pipe, described upcast supervisor 3 is communicated with the close arranging pipe of latter end flue 1 by riser leg 2, the steam flow direction that described riser leg 2 axis and upcast are responsible for 3 axis is connected angle α and is less than 90 °, and the steam flow angular separation β being responsible for the linkage section section of the being adjacent axis of 3 riser legs be communicated with 2 with described upcast is less than 90 °.

Described converter is 120t converter, and the bridge piece center radius being responsible for the linkage section section of being adjacent of 3 riser legs be communicated with 2 with described upcast is not less than 300mm.

Described connection angle α is 20 ~ 50 °.

Described connection angle β is 15 ~ 60 °.

Between the turnover of described latter end flue 1, straight transitions connects.

Any one section of described riser leg 2 is greater than 15 ° with the angle of horizontal plane.

utility model works principle and working process:

The utility model is by reducing the angle of upcast supervisor and its arm and reducing angle between arm, particularly comprehensively strengthen upcast knuckle radius, thus reduce the resistance to flow of upcast supervisor level arm medium, increase the strength of turbulence of the secret comb medium of latter end flue, stop or weaken the generation of latter end flue separation of two phenomenon, strengthen the cooling performance of latter end flue solid matter cooling tube, reduce the thermal fatigue strength of solid matter cooling tube, reach and reduce converter latter end flue and frequently to leak, improve the object of latter end flue evaporated cooling system reliability.Meanwhile, be greater than 15 ° by the angle controlled between riser leg and horizontal plane, water-level fluctuation when can reduce the resistance of pipe medium further and bessemerize in drum, thus strengthen the cooling performance of tube wall; In addition, use the arc transition of latter end flue conventional employing in the prior art the transition of instead straight line transition junctions, reach the flat segments reducing end flue, thus weaken the object of the objective condition forming steam layering.Therefore, the utility model has the advantages that structure is simple, cost is low, subtract leakage Be very effective.

As shown in Figures 3 and 4,2 the 120t converters of Kun Gang new district steelworks, after latter end flue runs 6 months, first time leaks beginnings, later average monthly often block converter leak about 5 times, approximately leaked once every 5 to 7 days, each soldering servicing time is 4 hours.One block converter is produced qualified molten steel in every 4 hours and is about 430t, monthly because latter end flue leaks and affects output and be: 430t × 5 time/month × 2 block converters=4300t, then directly will reduce output 51600t every year, and then cause larger financial loss.And leaking area is 6th floor, high building, distance more than 50 meter, ground is high, and repair and maintenance is inconvenient, and when especially will enter the operation of flue internal overhaul by flue top manhole, not only danger is not only difficult but also time-consuming etc. especially.

8 arms of existing latter end flue upcast and the angle of supervisor are all 90 °, and the resistance factor of its correspondence is 1.419; Transform the angle of 8 arms and supervisor as 22 °, 46 °, 37 °, 42 °, 36 °, 29 °, 22 ° and 22 ° respectively, improved average resistance factor is 1.122.

Existing riser leg 9 90 ° of broken pipe broken pipes are transform as 35 °, 55 °, 30 °, 20 °, 20 °, 33 °, 35 °, 55 ° and 15 ° respectively, broken pipe resistance factor before transformation is about 0.985, and after transformation, broken pipe resistance factor is about 0.062.

The whole expansion respectively of the radius of curvature R value 250,250,250,250,300,300,300,300,250,250 of existing 10 90 ° of bend pipes transform 350,350,500,600,450,450,400,375,350 and 350 as, 90 ° of bend pipe resistance factors before transformation are about 0.210, and the average resistance factor of improved bend pipe is about 0.134.

Transform by the latter end flue of above scheme to two block converters, transformation carrys out operation conditions more 1 year good, and the interval time of leaking in the region that leaks brought up to 30 to 35 days from original 5 to 7 days, within about 30 days, opens the observation of insulation tectum, only has the leak source of minority.In witness, medium flowing more smoothly, and carbonated drink perturbation action is strengthened, and separation of two phenomenon obtains effective suppression, largely solves the difficult problem that latter end flue frequently leaks, and transformation achieves successfully.Improved indices is shown in Table 1.

The improved index table of table 1

Claims (6)

1. a converter latter end flue high reliability elaporative cooling tedge, it is characterized in that comprising latter end flue (1), riser leg (2), upcast supervisor (3), described latter end flue (1) is provided with close arranging pipe, described upcast supervisor (3) is communicated with by the close arranging pipe of riser leg (2) with latter end flue (1), described riser leg (2) axis is responsible for (3) axis steam flow direction with upcast is connected angle α and is less than 90 °, the steam flow angular separation β being responsible for the linkage section section of the being adjacent axis of the riser leg (2) that (3) are communicated with described upcast is less than 90 °.

2. converter latter end flue high reliability elaporative cooling tedge according to claim 1, it is characterized in that described converter is 120t converter, the bridge piece center radius being responsible for the linkage section section of being adjacent of the riser leg (2) that (3) are communicated with described upcast is not less than 300mm.

3. converter latter end flue high reliability elaporative cooling tedge according to claim 2, is characterized in that described connection angle α is 20 ~ 50 °.

4. converter latter end flue high reliability elaporative cooling tedge according to claim 2, is characterized in that described connection angle β is 15 ~ 60 °.

5. converter latter end flue high reliability elaporative cooling tedge according to claim 1, between the turnover that it is characterized in that described latter end flue (1), straight transitions connects.

6. converter latter end flue high reliability elaporative cooling tedge according to claim 1, is characterized in that any one section of described riser leg (2) is greater than 15 ° with the angle of horizontal plane.