CN2401867Y - Heat exchanger of corrosion-resistant low alloy section variable steel pipe - Google Patents

Abstract

The utility model relates to a heat exchanger of corrosion-resistant low alloy variable section steel pipe, which is mainly used for the corrosion-resistant field of a petrochemical heat exchanger. The utility model is mainly characterized in that a 12Cr2AlMoV steel pipe which has the good performance for resisting the stress corrosion of hydrogen sulfide is used as a raw material of a variable section pipe of the heat exchanger; the variable section pipe is a spiral fine-grained pipe, or a cross grain pipe, or a corrugated pipe, or a thread pipe or a T-shaped pipe. Compared with a stainless steel pipe, the utility model has the characterized in that the utility model has good performance for resisting the stress corrosion of the hydrogen sulfide, and has the good heat transfer performance; in addition, the investment cost of equipment is saved. Thereby, the utility model can be widely used for petrochemical industry, electric power industry, etc.

Description

A kind of heat exchanger of corrosion-resistant cross-section variable low-alloy pipes

The utility model relates to the corrosion-resistant field of heat exchangers that petrochemical plant is used.

Be generally stainless steel, copper material or ordinary carbon steel at the existing variable cross-section heat exchanger tubing of having announced with material, as the patent CN2314333Y that announced on April 14th, 99 and CN2314327Y etc., all only select stainless steel or copper material for use at raising heat transfer efficiency and general high temperature corrosion state, but stainless steel and copper material have bigger limitation in many corrosive environments, stress corrosion as not anti-hydrogen sulfide of stainless steel and hydrochloric acid, the not anti-ammonia corrosion of copper material, and the tubing after variable cross-section processing can produce new stress and accelerate its corrosion phenomenon.

The purpose of this utility model is to provide a kind of low-alloy tubing 12Cr2AlMoV of anti-H 2 S stress corrosion or the heat exchanger that 09CrAlMoRE makes various variable cross-section efficient heat conducting tubes, makes heat exchanger tube have the double effects of anti-H 2 S stress corrosion and raising heat exchange efficiency simultaneously.

The utility model is by following scheme implementation:

In order to solve the anti-H 2 S (H that middle heat exchanger tube is put in the oil makeup ₂S) stress corrosion problem, I had declared " corrosion-proof heat exchanger of high temperature resistance sulphur, wet hydrogen sulfide, corrosion of sulfuric acid at dew point " (publication number CN1191300A) once on September 11st, 97, on September 15th, 99 was declared " steel of anti-H 2 S, chloride ion corrosion and special equipment thereof and accessory " (application number 99116658.2), had mainly introduced anti-(H ₂S) 12Cr2AlMoV of stress corrosion and replacement shaped steel kind 09Cr2AlMoRE.Its varying cross-section duct and tube bank thereof can overcome former carbon steel and stainless steel varying cross-section duct insurmountable difficult problem in hydrogen sulfide medium with 12Cr2AlMoV or 09Cr2AlMoRE tubing, have fundamentally solved common variable cross-section steel pipe at anti-H 2 S (H ₂S) deficiency of stress corrosion aspect.

Mainly contain spiral microgroove pipe (Fig. 2), band pipe (Fig. 3), bellows (Fig. 4), screwed pipe (Fig. 5) and T shape with the form of the varying cross-section duct of 12Cr2AlMoV or 09Cr2AlMoRE tubing processing and manage (Fig. 6) etc. five kinds.Its varying cross-section duct is identical with the standard heat exchanger with the connecting mode of heat exchanger tube sheet.The specification of its light pipe is diameter of phi 19-38mm, thickness δ=1.5-3.0mm.

The utility model compared with prior art has following advantage: 1. solved common varying cross-section duct at anti-H 2 S stress (H from material itself ₂S) deficiency of corrosion aspect; 2. heat transfer efficiency significantly improves, and the thermal conductivity of low-alloy tubing itself is just high 3 times than stainless steel, and variable cross-section tubing is than the high 1.5-3.0 of heat transfer property times of light pipe.Therefore, its selection advantage is quite obvious.

Be described further below in conjunction with accompanying drawing:

Fig. 1 is a heat exchanger, and it is made of bobbin carriage (1), housing (2) and heat exchanger tube (3)

Fig. 2 is a spiral microgroove pipe

Fig. 3 is the band pipe

Fig. 4 is a bellows

Fig. 5 is a screwed pipe

Fig. 6 is T shape pipe

The processing method of the variable cross-section heat-transfer pipe of corrosion-resistant tubing 12Cr2A1MoV of the utility model heat exchanger and 09Cr2AlMoRE is consistent with the processing method of common stainless steel material, and the assembling and the indistinction of the manufacturing of heat exchanger tube and common light pipe.Because the utility model has anti-H 2 S stress corrosion simultaneously and improves the double effects of heat exchange efficiency, thereby can be widely used in the heat exchanger device of industries such as petrochemical industry.

Claims (2)

1, a kind of shell-and-tube heat exchanger, it is made of bobbin carriage (1), housing (2) and heat exchanger tube (3), it is characterized in that: spiral microgroove pipe or band pipe or bellows or screwed pipe or T shape pipe that the heat exchanger tube of its described heat exchanger (3) is processed into for the 12Cr2AlMoV special steel pipe of hydrogen sulfide corrosion resistant.

2, as claims 1 described heat exchanger, it is characterized in that: its used 12Cr2AlMoV special steel pipe specification is diameter of phi 19-38mm, thickness δ=1.5-3.0mm.

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