CN2225601Y

CN2225601Y - Enamel tube preheater

Info

Publication number: CN2225601Y
Application number: CN 95234036
Authority: CN
Inventors: 金怡漠; 杨兆平; 王翔林; 董文圣; 郑克
Original assignee: XINDIAN POWER PLANT SHANDONG PROV
Current assignee: XINDIAN POWER PLANT SHANDONG PROV
Priority date: 1995-06-05
Filing date: 1995-06-05
Publication date: 1996-04-24
Anticipated expiration: 2005-06-05

Abstract

The utility model discloses an enamel tube preheater, which has good anticorrosion properties. The utility model solves the problem of sealing of a tube mouth, and a sealing device is composed of a tube plate (3), a steel plate (5) and an acid resistant and refractory mortar layer (4). The tube plate (3) is welded with the tube mouth, and the inner side of the sealing device is the mortar layer (4) and a steel plate layer (5) in sequence. The sealing device not only solves the sealing problem but also effectively prevents the enamel layer from corroding occurring because weld is possible to make the enamel layer damaged. So the service life is long. The enamel tube preheater is suitable for not only the matched high, medium and low temperature segments air preheaters of the boiler of the power plant but also the matched preheaters of the boilers of other industries.

Description

Enamel tube preheater

The utility model relates to a kind of preheater, is in particular a kind of Enamel tube preheater.

At present, the power plant is generally steel pipe type with air preheater that boiler is joined, be divided into high temperature, middle temperature, end temperature section preheater, though coal furnace or oil burner, owing to use coal, sulfur content is higher in the fuel oil, cause boiler preheating device dust stratification seriously corroded, cause in a large number leak out, the operation of exerting oneself falls in stifled ash, stove group, has a strong impact on the safety and economic operation of boiler, in low-temperature zone, it is even more serious that corrosion is revealed in acid especially.Through the glass tube preheater, the metal thermal spraying preheater, examine and step on the test of steel pipe preheater, examine that to step on steel pipe preheater result of use better, but expansion along with unit frequency modulation peak regulation range, underrun time lengthening, start-stop heat number increases, on low-temperature zone, use and examine that to step on pipe still desirable not to the utmost, and examine that to step on the steel pipe source of goods in short supply, for this reason, the producer that has has adopted the porcelain enamel steel tube preheater, and porcelain enamel steel tube has corrosion resistant characteristic, its appearance fouling phenomenon water flushing can be bright as new, but its ferrule problem is a difficult problem, and Chongqing Power Plant and Hu County power plant adopt the method for the stifled asbestos wool of plug to seal, and fails to solve well the mouth of pipe problem of leaking out.

The purpose of this utility model is to overcome the defective of above-mentioned prior art and a kind of good seal performance, Enamel tube preheater that antiseptic property is good are provided.

The purpose of this utility model realizes in the following way,

Enamel tube preheater, the main bobbin carriage of forming by the sealing device of many enamel pipes and enamel pipe mouth of pipe side, feature is that described sealing device is made up of tube sheet, steel plate and acidproof therebetween refractory mortar layer, tube sheet is welded to the enamel pipe mouth of pipe, and its inboard is followed successively by acidproof refractory mortar layer, steel plate layer.

Behind the enamel pipe mouth of pipe weld metal tube sheet; make mouth of pipe side (bobbin carriage in other words) obtain better seal; but near the enamel on the surface of weld bond can sustain damage (even welding heat affected zone is very little); for more reliable in use; the infiltration of avoiding injury region revealed by acid comes off the enamel explosion; thereby at the acidproof refractory mortar of tube sheet inboard pouring one deck, the steel plate layer is in order to protect and the fixing glue mud layer.Thereby the enamel pipe mouth of pipe has not only obtained good sealing but also has prevented corrosion.

Further specify the utility model below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the sealing device schematic diagram.

Among the figure, 1 enamel pipe, 2 sealing devices, 3 tube sheets, 4 acidproof refractory mortar layers, 5 steel plates, 6 edges.

As a kind of embodiment, during making, the thick 16mm (heat affected area) that can be of tube sheet, acidproof refractory mortar bed thickness 30～50mm, steel plate 5mm, edge 6 constitutes bobbin carriage with sealing device 2, enamel pipe 1.

Though because the existence of enamel layer influences heat transfer coefficient, enamel layer very thin (as only being 0.5mm) can not cause big influence to burning, and the mother metal of enamel pipe is selected the high A of heat transfer coefficient for use ₃F steel pipe, its thermal conductivity factor are better than examining on the contrary steps on steel, through experiment test, with A ₃F is that Enamel tube preheater ratio that mother metal is made examines that to step on steel preheater heat transfer coefficient high by 16.2%.

Advantage of the present utility model,

Good seal performance has solved the sealing problem of the enamel pipe two ends mouths of pipe, and preheater is fallen Low leaking out; Corrosion-resistant, solved asking of the boiler tail cold end corrosion that uses high-sulfur combustor Topic, the cold end corrosion under the low load condition has fundamentally been avoided in the application of enamel pipe, adapts to The peak-frequency regulation of unit; Improved the safety operation level of unit; Long service life has Preferably economic benefit and social benefit; Low temperature, middle temperature, high temperature section preheater are all applicable, The boiler preheater that also is fit to other industry.

Claims

1, a kind of Enamel tube preheater, the main bobbin carriage of forming by the sealing device (2) of many enamel pipes (1) and enamel pipe oral-lateral, it is characterized in that described sealing device (2) comprises tube sheet (3) steel plate (5) and acidproof refractory mortar layer (4) therebetween, tube sheet (3) is welded in the enamel pipe mouth of pipe, and its inboard is followed successively by acidproof refractory mortar layer (4), steel plate layer (5).