CN201028469Y

CN201028469Y - W type full natural circulation pyrite waste heat boiler

Info

Publication number: CN201028469Y
Application number: CNU2007200794567U
Authority: CN
Inventors: 夏正; 夏禄殿
Original assignee: XIA ZHENG XIA LUDIAN
Current assignee: XIA ZHENG XIA LUDIAN
Priority date: 2007-04-30
Filing date: 2007-04-30
Publication date: 2008-02-27
Anticipated expiration: 2017-04-30

Abstract

The utility model discloses a W-type full natural circulation pyrite waste heat boiler, which comprises a drum, a centralized downcomer, a flue gas inlet, four longitudinal flues, a flue gas outlet, two ash hoppers, each water-cooled wall and each collector. box, superheater, convection tube bundle, column and beam, and ash slag cooling tube bundles connected to the lower header at both ends and several inclined and louver-like baffles are arranged in the two ash hoppers; as the utility model For further improvement, partition wall water-cooled tubes are provided in the refractory concrete partition walls of the four flues, and the horizontal tubes of the partition wall water-cooled tubes are arranged at an upwardly inclined angle; the heat exchange tubes of the convection tube bundles of the third and fourth flues The projections on the horizontal plane are arranged in a fork-shaped staggered arrangement; several pieces of flue gas diversion baffles welded to the upper header are arranged in the flue gas diversion area on the upper part of the third flue. The utility model has the advantages of high thermal efficiency, difficult collapse of partition walls and long service life, and can realize full natural circulation.

Description

The full Natural Circulation troilite of W type waste heat boiler

Technical field

The utility model relates to a kind of W type troilite waste heat boiler.

Background technology

At present, at the widely used W type of pyrite-based sulfuric acid production industry troilite waste heat boiler, comprise drum, disperse down-comer, gas approach, four vertical flues, exhanst gas outlet, lay respectively at first and second flues, two ash buckets under third and fourth flue, place water-cooling wall and each collection case in each flue, and column and crossbeam, in second flue, also be provided with superheater, in third and fourth flue, also be provided with convection bank, during work, the lime-ash of high temperature falls into the hydrolock dust ram under ash bucket and the ash releasing tube, a large amount of high temperature grey particles enter in the water, produce strong evaporation, water vapour is in ash bucket enters flue, after water vapour is heated, be discharged from boiler, reduced the thermal efficiency of boiler at last; Partition wall is used refractory concrete merely simultaneously, then collapse easily, or single panelized-tube-wall section of using, then be difficult for maintenance after the seepage; And the projection of the heat exchanger tube of the convection bank of third and fourth flue on horizontal plane arranged in an overlapping, reduced the quantity of heat exchanger tube under equal height, reduced heating surface, further reduced the thermal efficiency of boiler, if reached same efficiency, steel consumption just increases.

The utility model content

The purpose of this utility model is the above-mentioned deficiency at prior art, the full Natural Circulation troilite of the W type waste heat boiler that provides a kind of thermal efficiency height, partition wall to be difficult for collapsing.

For achieving the above object, the full Natural Circulation troilite of W type of the present utility model waste heat boiler, comprise drum, common downcomer, gas approach, four vertical flues, exhanst gas outlets, lay respectively at two ash buckets under first and second flues, third and fourth flue, place the water-cooling wall in each flue and respectively collect case and column and crossbeam, in second flue, also be provided with superheater, in third and fourth flue, also be provided with convection bank, it is characterized in that in two ash buckets, being equipped with the lime-ash cooling tube bundle that two ends link to each other with the next part case; This cooling tube bundle absorbs the heat of hot lime-ash, also improves the thermal efficiency of boiler when increasing evaporation capacity;

As further improvement of the utility model, in the refractory concrete partition wall of four flues, be equipped with the partition wall water cooling tube, the horizontal pipe of partition wall water cooling tube is acclivitous angle setting; Overcome and collapsed easily merely, or singly made partition wall with panelized-tube-wall section with the refractory concrete wall, not easy-to-maintain disadvantage after the seepage, and make vapour, water stratification in the pipe, prevent steam binding, to guarantee the Natural Circulation of pot water;

As further improvement of the utility model, the projection of the heat exchanger tube of the convection bank of third and fourth flue on horizontal plane is the fork-shaped stagger arrangement arranges, has increased the quantity of heat exchanger tube under equal height, has strengthened heating surface, further improves the thermal efficiency of boiler;

As further improvement of the utility model, in two ash buckets, all be furnished with several piece baffle plate that tilt, venetian blind type, most of lime-ash effectively can be separated, and make flue gas stream when turning to, reduce the bias current effect, reduce washing away to superheater, water-cooling wall and convection bank, reduce wearing and tearing, prolong the service life of superheater, convection bank and water screen tube;

As further improvement of the utility model, be provided with doubly-linked lock flap valve at ash releasing tube place, the bottom of two ash buckets, opening gravity automatically and can being designed to different values of upper and lower two turnover panels do not opened two turnover panels simultaneously, treat to discharge again after the cooling of high temperature soot particle, improved the thermal efficiency;

As further improvement of the utility model, the flue gas on the 3rd flue top turns to the district to be provided with several piece and is welded on flue gas hydraulic barrier on the upper collecting chamber, makes flue gas flow equalizing, reduces bias current, reduces the erosive wear for convection bank, prolongs pipe service life;

As further improvement of the utility model, upper collecting chamber inboard below gas approach is welded with several bitch, be coated with refractory concrete at upper collecting chamber and bitch, make refractory concrete adhere to more firmly, avoid coming off, and the cross-sectional area of gas approach is less than the cross-sectional area of first flue, flue gas and dust maintain certain distance with water screen tube after entering first flue, to reduce wearing and tearing, prolong the life-span of membrane wall pipe to tube outer wall;

As further improvement of the utility model, be furnished with manual rapping apparatus on the heat exchanger tube of the convection bank in third and fourth flue, can remove superficial dust effectively, improve the thermal efficiency of boiler;

As further improvement of the utility model, all pass on the collection case of furnace wall and the pipe and all weld an annular slab, being the gap between annular slab and the furnace wall is provided with, between the outer casing of ring baffle and furnace wall, be provided with the mixture of refractory fibre and fire clay, both guaranteed the expansion freely between collection case and pipe and the furnace wall, the reliable sealing of having got back;

In sum, the utlity model has that thermal efficiency height, partition wall are difficult for collapsing, the advantage of long service life, and can realize full Natural Circulation.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the structural representation of partition wall.

Fig. 4 is the A-A cutaway view of Fig. 2.

Fig. 5 is the partial enlarged drawing at I place among Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described.

By illustrated in figures 1 and 2, the full Natural Circulation troilite of this W type waste heat boiler, comprise drum 1, common downcomer 2, gas approach 3, four

vertical flues

4,5,6,7, exhanst gas outlet 8, lay respectively at first and

second flues

4,5, third and fourth flue 6, two ash buckets 9 under 7, place water-cooling wall and each collection case in each flue, and column 10 and crossbeam 11, in second flue 5, also be provided with superheater 12, in third and

fourth flue

6,7 also are provided with convection bank 13, wherein, in two ash buckets 9, be equipped with lime-ash cooling tube bundle 14 that two ends link to each other with the next part case and five inclinations, the baffle plate 15 of venetian blind type, in the ash releasing tube 16 of two ash buckets 9, all be furnished with doubly-linked lock flap valve 17, on, opening gravity automatically and can being designed to different values of following two turnover panels do not opened two turnover panels simultaneously; Upper collecting chamber 18 inboards below gas approach 3 are welded with a plurality of bitch 19, be coated with refractory concrete at upper collecting chamber 18 and bitch 19, make refractory concrete adhere to more firmly, and the cross-sectional area of gas approach 3 is less than the cross-sectional area of first flue 4, flue gas and dust enter first flue, 4 backs and maintain certain distance with water screen tube, to reduce wearing and tearing, prolong the life-span of membrane wall pipe to tube outer wall; In the refractory concrete partition wall of four flues, be equipped with partition wall water cooling tube 20, the horizontal pipe 21 of partition wall water cooling tube 20 is acclivitous angle setting (as shown in Figure 3), overcome and collapsed easily merely with the refractory concrete wall, or list is made partition wall with panelized-tube-wall section, not easy-to-maintain disadvantage after the seepage, and make vapour, water stratification in the pipe, prevent steam binding, to guarantee the Natural Circulation of pot water; The projection of heat exchanger tube 22 on horizontal plane of the convection bank 13 of third and

fourth flue

6,7 is the fork-shaped stagger arrangement and arranges, on heat exchanger tube 22, be furnished with manual rapping apparatus 23 (as shown in Figure 4), flue gas on the 3rd flue 6 tops turns to the district to be provided with the flue gas hydraulic barrier 25 of three block weldings on upper collecting chamber 18, make flue gas flow equalizing, reduce erosive wear, prolong pipe service life for convection bank 13; As shown in Figure 5, pass on the collection case of furnace wall and the pipe and all weld an annular slab 26, being the gap between annular slab 26 and the furnace wall is provided with, between the outer casing of ring baffle 26 and furnace wall, be provided with the mixture 27 of refractory fibre and fire clay, both guaranteed the expansion freely between collection case and pipe and the furnace wall, the reliable sealing of having got back.

Claims

1. A W-type full natural circulation pyrite waste heat boiler, including a drum, a centralized downcomer, a flue gas inlet, four longitudinal flues, and flue gas outlets, respectively located in the first and second flues, the third and Two ash hoppers under the fourth flue, water-cooled walls and headers placed in each flue, as well as columns and beams, superheaters are also installed in the second flue, and superheaters are also installed in the third and fourth flues. The convection tube bundle is characterized in that the ash slag cooling tube bundles with both ends connected to the lower header are arranged in the two ash hoppers.

2. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that the refractory concrete partition walls of the four flues are provided with partition wall water-cooled pipes, and the horizontal pipes of the partition wall water-cooled pipes are in the form of Angle setting for upward tilt.

3. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that the projections of the heat exchange tubes of the convection tube bundles of the third and fourth flues on the horizontal plane are arranged in a fork-shaped staggered arrangement.

4. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that several inclined, louver-like baffles are arranged in the two ash hoppers.

5. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that double chain flap valves are arranged in the ash discharge pipes of the two ash hoppers.

6. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that several flue gas diversion baffles welded on the upper header are arranged in the flue gas diversion area on the upper part of the third flue .

7. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that several nails are welded on the inner side of the upper header below the flue gas inlet, and the upper header and the nails are covered with Refractory concrete, and the cross-sectional area of the flue gas inlet is smaller than the cross-sectional area of the first flue.

8. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that a manual rapping device is arranged on the heat exchange tubes of the convection tube bundles in the third and fourth flues.

9. The W-type full natural circulation pyrite waste heat boiler according to claim 1, characterized in that all the headers and pipes passing through the furnace wall are welded with an annular plate, and there is a gap between the annular plate and the furnace wall. A mixture of refractory fiber and refractory mud is arranged between the annular baffle and the outer guard of the furnace wall.