CN201935584U

CN201935584U - W-shaped fully-naturally-circulating boiler for recycling afterheat of zinc concentrate smelting flue gas before acid production

Info

Publication number: CN201935584U
Application number: CN2010206743217U
Authority: CN
Inventors: 夏正; 夏毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-22
Filing date: 2010-12-22
Publication date: 2011-08-17
Anticipated expiration: 2020-12-22

Abstract

The utility model discloses a W-shaped fully-naturally-circulating boiler for recycling afterheat of zinc concentrate smelting flue gas before acid production. The boiler comprises a boiler body, an inlet flue, a top beam, upright posts, a boiler barrel, a vapor connecting pipe, a centralized downcomer, distributed downcomers, headers, three staggered water-cooling partition walls, an ash bucket and an outlet flue; flue walls at the inner periphery of the boiler body and the inner wall of the top of the boiler are of film-type water-cooling wall structures; the three water-cooling partition walls form four water-cooling flues inside the boiler body; superheaters are arranged inside the second flue and the third flue; convecting heated flag-shaped pipe sets are arranged on the fourth flue; a bin wall vibrating device and a fuel-pulse dust-blowing device are arranged outside the boiler; the bottom of the inlet flue inclines downwards; an upper header, a lower header and a film-type water-cooling wall are arranged inside the inlet flue; and the upper header and the lower header are connected with the header inside the boiler respectively. The W-shaped fully-naturally-circulating boiler has the advantages of compact structure, small occupied space and insusceptibility of scale formation; the running period of the boiler is prolonged; and overheating vapor can be generated for power generation.

Description

The full Natural Circulation zinc concentrate of W type metallurgical off-gas acid-making waste heat boiler

Technical field

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

Background technology

In the zinc concentrate smelting process, from the SO that contains of roaster generation ₂About 900 ℃ of high-temperature flue gas, by removing to produce sulfuric acid behind the waste heat boiler recovery waste heat, but wherein contain more mine dust, about 200g/Nm ³Mine dust, complicated component, the bonding adhesion property very strong.The flow direction of waste heat boiler was the horizontal linear form in the past, was only applicable to produce saturated vapor, and boiler takes up an area of big.In exhaust-heat boiler flue gas import department one section horizontal segment of building by laying bricks or stones with refractory material is arranged, the anterior empty smoke-box that is is arranged subsequently, stroke is shorter, the flue gas cool-down amplitude is little, flue gas enters convection current area under control, rear portion more subsequently, flue-gas temperature is reduced to about 400 ℃, last flue gas goes next procedure relieving haperacidity, and can not produce superheated steam, reason is that the very strong mine dust of adhesive property can be bonded to circular skull outside conventional superheater coil tubes, is difficult to remove, operation than short-term flue promptly blocked, be forced to blowing out, interbank deashing slag is also very difficult, can not guarantee the long-term normal operation of boiler.

The utility model content

The purpose of this utility model is the above-mentioned deficiency at prior art, the full Natural Circulation zinc concentrate of a kind of W type metallurgical off-gas acid-making waste heat boiler is provided, it has compact conformation, takes up an area of little, as to be difficult for slagging scorification advantage, thus the cycle of operation of prolonged boiler, and can produce superheated steam and be used for generating.

For achieving the above object, the full Natural Circulation zinc concentrate of W type of the present utility model metallurgical off-gas acid-making waste heat boiler, comprise body of heater, inlet flue duct, back timber, column, drum, the carbonated drink tube connector, common downcomer and distributing pipe, the collection case, the three road water-cooling wall partition walls that are crisscross arranged, several ash buckets, exhaust pass, walling of flue and furnace roof inwall around in the body of heater are film water cold wall structure, three road water-cooling wall partition walls form four water-cooled flues in body of heater, first flue is the cavity flue, be provided with superheater in second flue and the 3rd flue, be provided with the convection current flag facial canal group of being heated in the 4th flue, stove is provided with bulkhead vibrating device and gas impulse ash blower outward, the bottom that it is characterized in that described inlet flue duct is downward-sloping, top and bottom at inlet flue duct are respectively equipped with upper collecting chamber and next part case, be provided with the fin panel casing that links to each other with the next part case with upper collecting chamber around in inlet flue duct, upper collecting chamber and next part case link to each other with collection case in the body of heater respectively.

The utility model is owing to be provided with three road water-cooling wall partition walls in body of heater, walling of flue and furnace roof inwall around in the body of heater are film water cold wall structure, make the stove inner flue be W shape, the stroke of flue gas is longer, has compact conformation, take up an area of little advantage, and good effect of heat exchange, the flue gas cool-down amplitude is big, add and be provided with upper collecting chamber in the inlet flue duct, next part case and fin panel casing, containing the very strong mine dust of cementability in high-temperature flue gas contacts with fin panel casing, because fast its bonding tack of cooling greatly descends, in sweep of gases power, self gravitation, slagging scorification comes off after being easy to be shaken and beating under the effect of vibration force, fall in first flue and the ash bucket, be unlikely to be forced to blowing out because of sediment stops up flue, thus the cycle of operation of prolonged boiler;

As further improvement of the utility model, superheater in described second flue and the 3rd flue is a multiloop superheater, side all is fixedly connected with the fin of variable cross-section before and after the straight tube place of every coiled pipe, and the sectional area of fin is reduced outward gradually by the connection place with coiled pipe; This structure has reduced the unit heat flow of weld, do not make the wall temperature overtemperature of pipe weld, variable cross-section fin and pipe postwelding mutually also make and do not form circular grey skull attached to pipe and the outer lime-ash of fin, at lime-ash under the comprehensive function of multiple active forces such as gravity, vibration force, fuel gas pulse ash blower power, skull is eliminated easily, make the superheater coil tubes district keep flue unimpeded, do not stopped up by the dirt slag, the further prolonged boiler cycle of operation, and improve the heat exchange effect, produce superheated steam and be used for generating;

As further improvement of the utility model, on the sidewall of inlet flue duct, be provided with manhole; In case of necessity, can carry out scarfing cinder to inlet flue duct from manhole;

In sum, the utlity model has compact conformation, take up an area of little, as to be difficult for slagging scorification advantage, thus the cycle of operation of prolonged boiler, and can produce superheated steam and be used for generating.

Description of drawings

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

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

Fig. 3 is the C-C cutaway view of Fig. 1.

Fig. 4 is the enlarged drawing at H place among Fig. 3.

Fig. 5 is the structural representation of the interior fin panel casing of inlet flue duct among Fig. 1.

Fig. 6 is the left view of Fig. 5.

The specific embodiment

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

By Fig. 1, Fig. 2 and shown in Figure 3, the full Natural Circulation zinc concentrate of this W type metallurgical off-gas acid-making waste heat boiler, comprise body of heater 1, inlet flue duct 3, back timber 2, column 4, drum 5, carbonated drink tube connector 6, common downcomer 7 and distributing pipe 8, several collect case 9, the three road water-cooling wall partition walls 10 that are crisscross arranged, 11 and 12, several ash buckets 13, exhaust pass 14, walling of flue and furnace roof inwall around in the body of heater 1 are film water cold wall structure, three road water-cooling

wall partition walls

10,11 and 12 form four water-cooled flues in body of heater 1, first flue is the cavity flue, be provided with multiloop superheater 15 in second flue and the 3rd flue, side is all welded the fin 17 that is fixedly connected with variable cross-section before and after the straight tube place of every coiled pipe 15a, the sectional area of fin 17 reduces (as shown in Figure 4) outward gradually by the connection place with coiled pipe 15a, be provided with the convection current flag facial canal group 16 of being heated in the 4th flue, stove is provided with bulkhead vibrating device 18 and gas impulse ash blower 19 outward, the bottom of described inlet flue duct 3 is downward-sloping, as shown in Figure 5 and Figure 6, top and bottom at inlet flue duct are respectively equipped with upper collecting chamber 20 and next part case 21, be provided with the fin panel casing 22 that links to each other with next part case 21 with upper collecting chamber 20 around in inlet flue duct, upper collecting chamber 20 and next part case 21 link to each other with collection case 9 in the body of heater 1 respectively, are provided with manhole 23 on the sidewall of inlet flue duct;

During use, the flue gas of drawing from the zinc concentrate roaster enters inlet flue duct 3, containing the very strong mine dust of caking property in high-temperature flue gas contacts with fin panel casing 22, because fast its bonding tack of cooling greatly descends, be easy to be shaken in slagging scorification under the effect of sweep of gases power, self gravitation, vibration force and come off after beating, fall within inlet flue duct 3 inclined bottom, fall into again in the first empty flue and the ash bucket 13, be unlikely to be forced to blowing out because of sediment stops up flue; Flue gas enters first flue thereupon, because be the sky flue, combustion space is big, and stroke is long, and wall and furnace roof are fin panel casing, thereby heat absorption is many, flue gas temperature drop amplitude is big, and the lime-ash attached on the water-cooling wall reaches constant weight, and under the external force effect of bulkhead vibrating device 18, come off, fall into ash bucket 13 and discharge; Then, flue gas enters second, three flues, wherein the variable cross-section twin fin 17 on the multiloop superheater 15 has reduced the unit heat flow of weld, do not make the wall temperature overtemperature of pipe weld, variable cross-section fin 17 and pipe 15a postwelding mutually also make and do not form circular grey skull attached to pipe 15a and fin 17 outer lime-ash, at lime-ash from gravity, vibration force, under the comprehensive function of multiple active forces such as gas impulse ash blower 19, skull is eliminated easily, make the superheater coil tubes district keep flue unimpeded, do not stopped up by the dirt slag, the further prolonged boiler cycle of operation, and raising heat exchange effect produces superheated steam and is used for generating; At last, flue gas is discharged from exhaust pass 14 after flag face formula convection heating surface pipe group 16 heat exchange in the 4th flue;

The utility model is owing to be provided with three road water-cooling

wall partition walls

10,11 and 12 in body of heater 1, walling of flue and furnace roof inwall around in the body of heater are film water cold wall structure, make the stove inner flue be W shape, and the stroke of flue gas is longer, have compact conformation, take up an area of little advantage, be difficult for slagging scorification; In case of necessity, can carry out scarfing cinder to inlet flue duct 3 from manhole 23.

Claims

1. the full Natural Circulation zinc concentrate of W type metallurgical off-gas acid-making waste heat boiler, comprise body of heater, inlet flue duct, back timber, column, drum, the carbonated drink tube connector, common downcomer and distributing pipe, the collection case, the three road water-cooling wall partition walls that are crisscross arranged, several ash buckets, exhaust pass, walling of flue and furnace roof inwall around in the body of heater are film water cold wall structure, three road water-cooling wall partition walls form four water-cooled flues in body of heater, first flue is the cavity flue, be provided with superheater in second flue and the 3rd flue, be provided with the convection current flag facial canal group of being heated in the 4th flue, stove is provided with bulkhead vibrating device and gas impulse ash blower outward, the bottom that it is characterized in that described inlet flue duct is downward-sloping, top and bottom at inlet flue duct are respectively equipped with upper collecting chamber and next part case, be provided with the fin panel casing that links to each other with the next part case with upper collecting chamber around in inlet flue duct, upper collecting chamber and next part case link to each other with collection case in the body of heater respectively.

2. the full Natural Circulation zinc concentrate of W type as claimed in claim 1 metallurgical off-gas acid-making waste heat boiler, it is characterized in that the superheater in described second flue and the 3rd flue is a multiloop superheater, side all is fixedly connected with the fin of variable cross-section before and after the straight tube place of every coiled pipe, and the sectional area of fin is reduced outward gradually by the connection place with coiled pipe.

3. the full Natural Circulation zinc concentrate of W type as claimed in claim 1 or 2 metallurgical off-gas acid-making waste heat boiler is characterized in that being provided with manhole on the sidewall of inlet flue duct.