CN201401770Y

CN201401770Y - Sulfur waste heat recovery boiler

Info

Publication number: CN201401770Y
Application number: CN2009200136449U
Authority: CN
Inventors: 李超; 赵洪彪; 余传林; 庄宇刚; 何成国; 刘晓龙; 段日莎; 崔晓兰; 姜振华
Original assignee: 余传林
Priority date: 2009-05-11
Filing date: 2009-05-11
Publication date: 2010-02-10
Anticipated expiration: 2019-05-11

Abstract

The utility model discloses a sulfur waste heat recovery boiler, comprising a boiler drum, a connection flue and a front smoke box, which is characterized in that the boiler drum is a dual-boiler drumstructure; the lower boiler drum is a heat exchanger; the upper boiler drum is a steam drum; a superheater is arranged in the flue on the front part of the boiler; and the pipe bundle of the superheater is connected with the upper boiler drum through a steam connection pipe. The upper boiler drum and the lower boiler drum are connected into a whole body through a built-in rising pipe and a built-in down pipe, wherein the lower boiler drum is welded with a pipe plate. The pipe plate is connected with an expansion-welding structure of a thread smoke tube. Fire resistant concrete and perlite concrete are placed on the pipe plate on the inlet side of the smoke pipe. The protective coating is placed or not placed on the outlet side according to the smoke condition. The center of the lower boiler drum is provided with a large diameter central drum with a smoke control valve for regulating the smoke temperature on the outlet of the boiler. The sulfur waste heat recovery boiler has the characteristics of simple structure, convenient maintenance, safe and stable operation, no corrosion and high heat efficiency, and is suitable to be used in coal chemical industry, oil chemical industry andchemical industry.

Description

The sulfur recovery waste heat boiler

Technical field

The present invention relates to the recovery of waste heat in the cooling of Coal Chemical Industry, oiling industrial and commercial bank industry sulfur recovery acidic flue gas and the flue gas, belong to a kind of waste heat boiler.

Background technology

Along with China's Coal Chemical Industry, petroleum refining industry processing sulfur-bearing raw coal, crude oil quantity are increasing, annual reclaim high-quality sulphur reach ten surplus ten thousand tons, for country has opened up new a considerable number of sulphur resource.In the prior art, partial combustion process is generally adopted in sulfur recovery, and the sour gas that promptly contains hydrogen sulfide burns under the condition of oxygen supply deficiency, and when keeping the sulfur dioxide of hydrogen sulfide and generation proportional, hydrogen sulfide promptly is converted into elementary sulfur.The sour gas that above-mentioned Coal Chemical Industry, oiling industrial and commercial bank already produce enters the incinerator burning, produces high-temperature flue gas, waste heat boiler need be set reclaim heat.In general, existing employing water-tube boiler of used waste heat boiler or multitubular boiler, also have and adopt double-drum boiler.Adopt water-tube boiler as waste heat boiler, because part adopts light pipe and/or part to adopt the transverse fin pipe as heating surface in the convection bank, the flue gas velocity of liquid assets is diminished relatively, simultaneously because the boiler operatiopn load fluctuation is bigger, and the most of the time operates in below the halfload, make that so just light pipe partial fume flow velocity is lower, transverse fin pipe flue gas flow rate is reduced to can not be from the degree of deashing.Flue gas flow rate is little, causes that corrosivity composition and steam condense in the flue gas, on boiler heating surface, produces the boiler heating surface corrosion of metal.Because the dust stratification of transverse fin pipe makes boiler heating surface further reduce, cause exhaust gas temperature to raise.For collecting ash, though can adopt air bubble soot blower or steam sootblower to handle, all directly aggravated combining of corrosivity composition and water vapour in the flue gas after all, improved flue gas dew point, make boiler under higher temperature, just begin corrosion; Aggravated the flue dust accumulation owing to blow ash simultaneously, the effect of water vapour in addition causes dust stratification to be difficult to more remove.

When adopting multitubular boiler as waste heat boiler, mainly there is following problem: at first, because of it is single barrel structure, be difficult to determine the highest pyrosphere of boiler, cause the boiler operatiopn liquid fluctuating bigger, single in addition drum waste heat boiler water capacity is less, in case have a power failure suddenly or other misoperation, may cause the burning accident, be unfavorable for safe operation of the boiler; Secondly, single drum waste heat boiler must be made drum enough big in order to arrange enough boiler heating surfaces, makes steel consumption increase technological process and becomes complicated; The two drum multitubular boilers of employing are made waste heat boiler, and rising between two drums and decline tube connector are external, make boiler volume huge, system complex, and the boiler operatiopn life-span is short, and this pattern also is unfavorable for the drum safe and reliable operation.

Summary of the invention

Proposition of the present invention is intended to overcome targetedly the shortcoming of prior art, has designed the fume tube type sulfur recovery waste heat boiler of a kind of pair of built-in pipe of drum, and its technical solution is achieved in that

A kind of sulfur recovery waste heat boiler, comprise drum, connect flue and front smoke box, it is characterized in that described drum is made up of upper drum and lower drum, the two is coupled to one by built-in tedge and built-in down-comer, the front end of case of cooking is connected with superheater by connecting flue and front smoke box, and the tube bank of superheater is connected with upper drum by steam connection tube; Lower drum front tube sheet and lower drum back tube sheet are arranged in the described lower drum, between two tube sheets central tube is housed; Tail end at lower drum is connected with the back smoke box, on the back smoke box valve seat is housed, and adorns flue gas conditioning device on the valve seat, and its valve rod is done with the valve in being contained in central tube and is connected.

Returning apparatus has steam-water separator and built-in injecting type carbonated drink distributing pipe in the described upper drum, and the two connects by pipe fitting.

The heat-exchanging tube bundle that threaded flue constitutes also is housed in the described lower drum, and its pipe fitting is connected by the expanded and welded tube joint structure with described tube sheet; Build refractory brick and pearlite brick on the tube sheet of smoke pipe entrance side, and whether outlet side is built and is depended on the circumstances.

Also be welded with the down-comer guiding gutter on the barrel of described lower drum, the girth of grooved spare is 3/4 of the interior girth of lower drum.

Compared with prior art, advantage of the present invention mainly shows:

1, adopt two barrel structures, water capacity of the boiler is bigger, and installing clearance type steam-water separator guarantees that the water entrained by steam rate is far below 5% in the upper drum; The hydrospace is bigger, guarantees that boiler the lack of water accident can not take place in power off time, has also overcome the highest pyrosphere problem that single drum-type boiler can't be determined simultaneously;

2, improved load fluctuation adaptability, guarantee that the operation in 20%～130% scope of boiler operatiopn load is normal, by the flue gas flow adjusting device on the central tube, can control the boiler export flue-gas temperature and more than 50 ℃, not worry producing cold end corrosion greater than dew-point temperature;

3, boiler adopts built-in tedge and built-in down-comer, makes boiler structure simple, and volume is little, and construction investment reduces greatly;

4, boiler's tube-plate lays thermal insulation and waters material feeding, guarantees that tube sheet is not subjected to high-temperature flue gas to wash away the destruction of formation.

Description of drawings

6 of this Figure of description, wherein

Fig. 1 is a sulfur recovery waste heat boiler structural representation of the present invention;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the left view that Fig. 1 removes the superheater part;

Fig. 4 is the structure of boiler body schematic diagram of Fig. 1;

Fig. 5 is the vertical view of Fig. 4;

Fig. 6 is the A-A cutaway view of Fig. 4.

Among the figure, 1, superheater flue 2, superheater 3, connect flue 4, preceding case cigarette 5, steam connection tube 6, upper drum (drum) 7, boiler valve instrument 8, heat-insulation layer 9, back smoke box 10, boiler foundation 11, lower drum 12, boiler outer coatings 13, bearing 14, platform staircase 15, manhole 16, valve seat 17 tries the water, manhole 18, upper drum front head 19, upper drum cylindrical shell 20, steam fairlead joint 21, steam-water separator 22, emergency valve seat 23, injecting type is given water distribution pipe 24, Pressure gauge base 25, upper drum rear head 26, flue gas conditioning device 27, lower drum front tube sheet 28, built-in tedge 29, threaded flue 30, support plate 31, built-in down-comer 32, lower drum blow-off pipe 33, central tube 34, down-comer guiding gutter 35, lower drum back tube sheet 36, water level meter base 37, last blowdown base 38, feedwater base 39, manhole with vertical hanging cover.

The specific embodiment

A kind of pair of drum longitudinal sulfur recovery waste heat boiler shown in Fig. 1,2,3,4 and 5.Arrange superheater in the anterior flue of boiler, boiler adopts upper and lower pair of drum longitudinal structure, lower drum is a heat exchanger, arrange the threaded flue of a large amount of high efficient heat exchangings, upper drum is a drum, in be furnished with even steam vent plate, clearance type steam-water separator, last lower drum is connected as one by built-in tedge, down-comer, concrete tedge and down-comer quantity are looked the boiler smoke property calculation to go out boiler output definite.

Be welded with tube sheet before and after the lower drum, tube sheet is connected with threaded flue expanded and welded tube joint structure, builds fire-resistant concrete and perlite concrete on smoke pipe entrance side tube sheet, and outlet side looks then smoke condition is built and/or do not build aforementioned overcoat; In the central tube of a major diameter band smoke regulating valve of lower drum center assembling, the flue-gas temperature that is used to regulate the boiler export place.

The built-in injecting type of upper drum reaches upward to water distribution pipe, and blow-off pipe improves steam quality.Be evenly equipped with four interface of the level gauge in the front end both sides, arrange liquid level gauge according to actual conditions for the user.

The water of boiler cycles through built-in tedge, down-comer and down-comer guiding gutter and realizes.

This boiler pedestal adopts the smoke inlet side to fix the structure of outlet side free wxpansion.The outlet side bearing is provided with the Yao Yuan hole.

The outside of this boiler clads the back with colored steel bag coat with rock wool blanket.At the both sides and the front end of upper drum, be furnished with and walk on stage, good looking appearance, easy to operate.

Claims

1, a kind of sulfur recovery waste heat boiler, comprise drum, connect flue and front smoke box, it is characterized in that described drum is made up of upper drum (6) and lower drum (11), the two is coupled to one by built-in tedge (28) and built-in down-comer (31), the front end of case (11) of cooking is connected with superheater (2) by connecting flue (3) and front smoke box (4), and the tube bank of superheater (2) is connected with upper drum (6) by steam connection tube (5); Lower drum front tube sheet (27) and lower drum back tube sheet (35) are arranged in the described lower drum, central tube (33) is housed between two tube sheets; Tail end at lower drum (11) is connected with back smoke box (9), on the back smoke box valve seat is housed, and adorns flue gas conditioning device (26) on the valve seat, and its valve rod is done with the valve in being contained in central tube (33) and is connected.

2, sulfur recovery waste heat boiler according to claim 1 is characterized in that: the described middle returning apparatus of pot case (6) of going up has steam-water separator (6) and built-in injecting type carbonated drink distributing pipe (23), and the two connects by pipe fitting.

3, sulfur recovery waste heat boiler according to claim 2 is characterized in that: the heat-exchanging tube bundle that threaded flue constitutes also is housed in the described lower drum (11), and its pipe fitting is connected by the expanded and welded tube joint structure with described tube sheet (27,35); Build fire-resistant concrete and perlite concrete on the tube sheet of smoke pipe entrance side, and whether outlet side is built and is depended on the circumstances.

4, sulfur recovery waste heat boiler according to claim 3 is characterized in that: also be welded with down-comer guiding gutter (34) on the barrel of described lower drum (11), the girth of grooved spare is 3/4 of the interior girth of lower drum (11).