CN202329961U

CN202329961U - Leakage detection device for U-shaped waste heat boiler pipe bundle

Info

Publication number: CN202329961U
Application number: CN 201120467649
Authority: CN
Inventors: 陆军; 周静
Original assignee: Anhui Huaihua Co Ltd
Current assignee: Anhui Huaihua Co Ltd
Priority date: 2011-11-23
Filing date: 2011-11-23
Publication date: 2012-07-11
Anticipated expiration: 2021-11-23

Abstract

The utility model relates to a leakage detection device for U-shaped waste heat boiler pipe bundle , and the technical scheme for achieving the purpose includes that a pressing ring connected with a casing is arranged on one side of a pipe sheet away from the opening of the casing; test paper is attached to the end face of the pipe sheet close to the pressing ring and two ports of each of U-shaped pipes; water connection inlets are connected with a nitrogen cylinder and an ammonia cylinder respectively, wherein the nitrogen cylinder and the ammonia cylinder are connected with a main valve respectively through a first valve and a second valve; a first ammonia pressure gage is arranged between the main valve and the water connection inlets; a first connection is connected with a second ammonia pressure gage through a third valve; a steam outlet and a second connection are respectively provided with blocking boards sealing the steam outlet and the second connection; and an atmospheric valve connected with a water groove is arranged at a discharge outlet. According to the technical scheme of the leakage detecting device, nitrogen and ammonia are filled into the casing, and all the valves connected with a container are closed, so that the container becomes an independent closed system; if ammonia escapes from leakage points, the color of the test paper is changed, and the position of leakage points are discovered.

Description

U type waste heat boiler tube bank leakage detection apparatus

Technical field

The utility model relates to a kind of leakage detection apparatus, relates to a kind of leakage detection apparatus of the U of being used for type waste heat boiler tube bank specifically.

Background technology

Waste heat boiler is claimed waste heat boiler again; Be to utilize high temperature logistics in the production run as the heat interchanger of thermal source producing steam in next life; It is the refrigeratory of high temperature logistics in the technological process; Being again to utilize waste heat that the propulsion system of steam are provided, is the technique unit operating equipment of chemical industry, oil refining and other industrial sector widespread use, and the main combiner of waste heat boiler has front end bobbin carriage, housing and back end structure (comprising tube bank) three parts.According to the version of U type waste heat boiler, this waste heat boiler belongs to U type heat exchange of heat pipe, and promptly every heat exchanger tube is all the U type; Two ends are separately fixed at two districts up and down of same tube sheet, are divided into by means of the dividing plate in the bobbin carriage and import and export two Room, because the heat exchanger tube of tube bank and tube head are the weak links of relative thin in the heat interchanger; The actual operating position of slave unit; Apparatus casing, flange can continue to use often, and tube bank is usually corroded owing to heat exchanger tube, and tube head leaks and lost efficacy.For assurance equipment can economic security move reliably, must carry out periodic inspection, leakage detection to waste heat boiler, but all exist tube sheet and tube bank leak source to be difficult for the shortcoming of observing.

The utility model content

The purpose of the utility model provides a kind of U type waste heat boiler tube bank leakage detection apparatus, and this device can accurately be found out the position of leak source.

For realizing above-mentioned purpose, the utility model has adopted following technical scheme: comprise housing, be respectively equipped with first interface, second interface, water inlet interface, steam (vapor) outlet and floss hole on the housing; The opening part of housing is provided with the tube sheet that matches with shell nozzle, is provided with the tube bank of U type in the housing, and the two ends of each U type pipe are separately fixed on the tube sheet in the tube bank of U type; Tube sheet is provided with pressure ring away from a side of shell nozzle; Pressure ring links to each other with housing, and tube sheet is pasted with test paper near the end face of pressure ring and the two-port place of each U type pipe, and described water inlet interface is connected with nitrogen cylinder and ammonia bottle respectively; Nitrogen cylinder is communicated with main valve through first, second valve respectively with the ammonia bottle; Be provided with first ammonia pressure gauge between main valve and the water inlet interface, described first interface links to each other with second ammonia pressure gauge through the 3rd valve, and described steam (vapor) outlet is respectively equipped with the closure plate that seals mutually with the steam (vapor) outlet and second interface with second interface; Described floss hole is provided with atmospheric valve, and atmospheric valve links to each other with tank.

The test paper of the utility model is a rice paper, and sprays phenolphthalein reagent on the rice paper.

Can know that by technique scheme the utility model charges into ammonia and nitrogen in the housing, close all valves that link to each other with container; Make it become an independently closed system, pressure was remained unchanged in the regular hour, because the perviousness of ammonia is more intense; Even so have small leakage also can show, on the tube sheet surface and the two-port place of U type pipe stick the test paper responsive to ammonia, ammonia is overflowed from leakage point; Make the display paper variable color, find out the position of leakage point with this.

Description of drawings

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

Embodiment

Below in conjunction with accompanying drawing the utility model is further specified:

A kind of U type waste heat boiler tube bank leakage detection apparatus as shown in Figure 1 comprises housing 1, and housing 1 is provided with first interface 2, second interface 3, water inlet interface 4, steam (vapor) outlet 5 and floss hole 6; The opening part of housing 1 is provided with the tube sheet 7 that matches with housing 1 opening; Be provided with the tube bank of U type in the housing 1, the two ends of each U type pipe 8 are separately fixed on the tube sheet 7 in the tube bank of U type, and tube sheet 7 is provided with pressure ring 10 away from a side of housing 1 opening; Pressure ring 10 and housing 1 link to each other through bolt; Tube sheet 7 is pasted with test paper 11 near the end face of pressure ring 10 and the two-port place of each U type pipe 8, and water inlet interface 4 places are connected with nitrogen cylinder 12 and ammonia bottle 13 respectively, and nitrogen cylinder 12 is communicated with main valve 16 through first, second valve 14,15 respectively with ammonia bottle 13; Be provided with first ammonia pressure gauge 17 between main valve 16 and the water inlet interface 4; First interface 2 links to each other with second ammonia pressure gauge 19 through the 3rd valve 18, and steam (vapor) outlet 5 is provided with the closure plate 20 that seals mutually with the steam (vapor) outlet 5 and second interface 3 respectively with second interface, 3 places, and floss hole 6 is provided with atmospheric valve 21; Atmospheric valve 21 links to each other with tank 9; The purpose that tank 9 is set is because ammonia is very easily water-soluble, and the ammonia that flows out from atmospheric valve 21 is like this avoided the injury of the smell of ammonia to human body by water-soluble the separating in the tank 9.

Preferred version as the utility model; Test paper 11 adopts rice paper, and sprays phenolphthalein reagent on the rice paper, and the one, because ammonia is different to the susceptibility of different indicator; Phenolphthalein has meets the characteristic that alkali reddens; So be easy to the leak source of the being checked location of developing the color, the 2nd, test paper is soaked by the phenolphthalein reagent that is sprayed, and more is prone to be attached to the tube sheet surface.Selecting other for use also is feasible to the responsive test paper of ammonia.

The concrete course of work is following:

Open the valve 14 and main valve 16 inflated with nitrogen in waste heat boiler housing 1 of nitrogen cylinder 12 earlier, the air in the displacement waste heat boiler, the oxygen content until atmospheric valve 21 places is less than or equal to 0.5%; This moment, tank 9 did not add water; Drive air in the equipment with nitrogen, do not have penetrating odor, just make to be full of this indifferent gas of nitrogen in the housing; To avoid forming the explosive mixture of ammonia and air, close the valve 14 of atmospheric valve and nitrogen cylinder 12 again; Rice paper closely is attached on the tube sheet 7, and the edge of rice paper is fixed with adhesive tape, sprays phenolphthalein reagent and makes rice paper remain moisture state; The valve 15 of opening ammonia bottle 13 charges into ammonia in housing 1, when the meter reading indicated pressure of first, second ammonia pressure gauge 17,19 reaches 0.09MPa, close the valve 15 of ammonia bottle 13, stops to fill ammonia, at this moment adds water in the tank 9; The valve 14 of opening nitrogen cylinder 12 charges into nitrogen in housing 1, when the meter reading indicated pressure of first, second ammonia pressure gauge 17,19 reaches 0.06MPa, close the valve 14 of nitrogen cylinder 12, stops to fill nitrogen; And then carry out the pressurize leak detection, under leak detection pressure, the dwell time is 6 hours, observes to have or not punctation to occur on the rice paper; After leak test finishes, carefully slowly open atmospheric valve 21 and carry out pressure release, avoid blowing away the water in the tank because of pressure is excessive; When pressure reduced to 0, the valve 14 of opening nitrogen cylinder 12 was replaced the ammonia in the waste heat boiler housing to housing 1 inflated with nitrogen, and after the replacement completion, valve-off 14 is removed the equipment and the instrument of leak detection usefulness at last and cleared up.Dwell time, then the punctation that leak source causes showing expanded the circle about diameter 25CM to, can confirm that heat exchanger tube has the crack, and mark is carried out in variable color place; Because heat exchanger tube is the U type, symmetry is found out the other end that leaks heat exchanger tube, also marked; After the pressure release displacement was qualified, processing and the corresponding plug of heat exchanger tube internal diameter were carried out the suffocation soldering to the leak tube head; Again carry out tightness test, no leakage point, leakage detection end-of-job after repairing well.

More than said parameter for the practice in an optimum value, also can select for use different dwell times or pressure etc. to test.

Claims

1. a U type waste heat boiler is restrained leakage detection apparatus; Comprise housing (1); Be respectively equipped with first interface (2), second interface (3), water inlet interface (4), steam (vapor) outlet (5) and floss hole (6) on the housing (1); The opening part of housing (1) is provided with the tube sheet (7) that matches with housing (1) opening; Be provided with the tube bank of U type in the housing (1); The two ends of each U type pipe (8) are separately fixed on the tube sheet (7) in the tube bank of U type, and it is characterized in that: tube sheet (7) is provided with pressure ring (10) away from a side of housing (1) opening, and pressure ring (10) links to each other with housing (1); Tube sheet (7) is pasted with test paper (11) near the end face of pressure ring (10) and the two-port place of each U type pipe (8); Described water inlet interface (4) locates to be connected with respectively nitrogen cylinder (12) and ammonia bottle (13), and nitrogen cylinder (12) is communicated with main valve (16) through first, second valve (14,15) respectively with ammonia bottle (13), is provided with first ammonia pressure gauge (17) between main valve (16) and the water inlet interface (4); Described first interface (2) links to each other with second ammonia pressure gauge (19) through the 3rd valve (18); Described steam (vapor) outlet (5) locates to be provided with respectively the closure plate (20) that seals mutually with steam (vapor) outlet (5) and second interface (3) with second interface (3), and described floss hole (6) is provided with atmospheric valve (21), and atmospheric valve (21) links to each other with tank (9).

2. U type waste heat boiler tube bank leakage detection apparatus according to claim 1, it is characterized in that: described test paper (11) is a rice paper, and sprays phenolphthalein reagent on the rice paper.