CN115435988A - Leakage detection method for tube pass of steam heat exchanger - Google Patents
Leakage detection method for tube pass of steam heat exchanger Download PDFInfo
- Publication number
- CN115435988A CN115435988A CN202211191544.1A CN202211191544A CN115435988A CN 115435988 A CN115435988 A CN 115435988A CN 202211191544 A CN202211191544 A CN 202211191544A CN 115435988 A CN115435988 A CN 115435988A
- Authority
- CN
- China
- Prior art keywords
- valve
- tube
- heat exchanger
- buffer tank
- steam heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
- G01M3/329—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell for verifying the internal pressure of closed containers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
A leak detection method for a tube pass of a steam heat exchanger comprises the following steps: 1) The tube pass inlet is provided with a first valve, and the tube pass outlet is provided with a second valve; 2) A first connecting pipe is arranged on the tube side inlet and positioned at the downstream of the first valve, a first buffer tank is arranged on the first connecting pipe, and a third valve is arranged at the top of the first connecting pipe; 3) The tube pass outlet is provided with an extension tube which is positioned at the upstream of the second valve, the extension end of the extension tube is provided with a second connecting tube, the second connecting tube is provided with a second buffer tank, the top of the second connecting tube is provided with a fourth valve, and the first connecting tube and the second connecting tube have the same height; 4) The third valve is connected with the negative pressure source, and the time is counted until the liquid level is in the first buffer tank and is recorded as the time t 1 (ii) a 5) The fourth valve is connected with the negative pressure source, and the time is counted until the liquid level is in the second buffer tank and is recorded as the time t 2 (ii) a 6) And calculating to determine the position of the leak hole. The invention has simple and convenient operation, can carry out leak detection work on the tube pass on the basis of not disassembling the steam heat exchanger, and determines the position of a leak point, thereby being convenient for maintenance personnel to overhaul.
Description
Technical Field
The invention relates to the field of chemical engineering, in particular to a leak detection method for a tube pass of a steam heat exchanger.
Background
The chemical industry uses ethanolamine as the adsorbent of carbon dioxide, the adsorbent is desorbed and then sent to the shell pass of the steam heat exchanger for continuous temperature rise, the vapor phase is recycled, and after the liquid phase remained in the shell pass of the steam heat exchanger is accumulated to a certain degree, the drain valve is opened for discharge for centralized treatment.
High-temperature and high-pressure steam is used as a heating medium through a tube pass of the steam heat exchanger, and a leak hole is easy to appear when the tube pass is in a high-temperature and high-pressure steam impact state for a long time. Under normal conditions, the vapor pressure is high, and ethanolamine in the shell pass cannot perform the tube pass. When steam pressure fluctuates or steam is interrupted, ethanolamine in the shell pass enters the tube pass through the leakage hole and is discharged to a downstream process along the tube pass, and the production safety is seriously threatened.
At present, because steam heat exchanger is bulky, the temperature is high, is difficult to the inspection leakage problem at ordinary times, only can take out the tube side is whole when the maintenance is shut down, and the manual work detects, wastes time and energy, and appears leaking the problem of examining easily.
Therefore, how to design an efficient and convenient leak detection method aiming at the tube pass of the steam heat exchanger is a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a leak detection method for a tube side of a steam heat exchanger, which is simple and convenient to operate, can perform leak detection work on the tube side on the basis of not disassembling the steam heat exchanger, determines the position of a leak point, is convenient for maintenance personnel to maintain, greatly improves the maintenance efficiency of the steam heat exchanger, and avoids the conditions of leak detection and error detection.
The technical scheme of the invention is as follows: a leak detection method for a tube pass of a steam heat exchanger comprises the following steps:
1) Closing a steam source, arranging a first valve at the outward extending end of the inlet of the tube pass of the steam heat exchanger to be detected to leak, and arranging a second valve at the outward extending end of the outlet of the tube pass of the steam heat exchanger to be detected to leak;
2) A first connecting pipe is arranged at the outward extending end of the inlet of the pipe pass of the steam heat exchanger to be detected to leak and is positioned at the downstream of the first valve, a first buffer tank is arranged on the first connecting pipe, and a third valve is arranged at the top of the first buffer tank;
3) An extension pipe which vertically extends upwards is arranged at the extending end of the outlet of the tube pass of the steam heat exchanger to be detected to leak and is positioned at the upstream of the second valve, the extension height of the extension pipe is h, a second connecting pipe is arranged at the extending end of the extension pipe, a second buffer tank is arranged on the second connecting pipe, a fourth valve is arranged at the top of the second buffer tank, and the first connecting pipe and the second connecting pipe are the same in height;
4) Closing the first valve and the second valve, respectively connecting the third valve and the fourth valve with a high-pressure air source, opening the third valve and the fourth valve, exhausting residual media in a pipe pass, and closing the third valve and the fourth valve;
5) The third valve is connected with the negative pressure source, the third valve is opened, timing is started until the liquid level in the first buffer tank is high, timing is stopped, and the time is recorded as time t 1 ；
6) Repeating the step 4);
7) The fourth valve is connected with the negative pressure source, the fourth valve is opened, timing is started until the liquid level height in the second buffer tank is the same as the liquid level height in the first buffer tank, timing is stopped, and the time is recorded as the time t 2 ；
8) The length of the tube pass of the steam heat exchanger to be detected to leak is known and is recorded as s, the length of the tube pass leakage point from the first buffer tank is set as x, the flow velocity of the process medium in the tube pass in the step 5) and the step 7) is the same,
then x/t 1 ＝(s-x+h)/t 2 And the heat exchange tube with the leakage hole can be determined by combining the length of the single tube of the tube side, so that the leakage detection operation is completed.
Further, in the step 1), the distance between the first valve and the tube side inlet is the same as that between the second valve and the tube side outlet.
Further, the first connecting pipe in the step 2) and the second connecting pipe in the step 3) have the same size, and the distance between the connecting end of the first connecting pipe and the tube side inlet is the same as the distance between the connecting end of the extension pipe and the tube side outlet.
Further, in the step 5) and the step 7), the negative pressure sources are all liquid ring vacuum pumps, and the provided vacuum degrees are the same.
Preferably, step 2) first buffer tank, step 3) the second buffer tank is the transparent jar of body, and all is provided with the liquid level scale on the lateral wall.
Further, the high-pressure gas source in the step 4) is a high-pressure nitrogen gas source.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. the leak detection method of the invention aims at the position detection of a leak point of a steam heat exchanger with a plurality of heat exchange tubes and elbows connected to form a whole, and a first valve and a second valve are respectively arranged at an inlet overhanging end and an outlet overhanging end of a tube pass to temporarily separate the tube pass from a steam source to form an independent interval tube section. Then set up first connecting pipe on the overhanging end in the import of tube side, be located the low reaches of first valve, and set up first buffer tank, first buffer tank top sets up the third valve, set up the extension pipe in the overhanging end in the export of tube side, and extend and serve and set up the second connecting pipe, and set up the second buffer tank, second buffer tank top sets up the fourth valve, make the height of first connecting pipe, second connecting pipe the same, make the leak source the same with the difference in height of first connecting pipe, second connecting pipe. Arrange earlier residual medium in the exhaust tube side, then form the negative pressure at first buffer tank respectively, the second buffer tank forms the negative pressure, make the medium in the shell side under the negative pressure effect, the warp leaks the some entering shell side, and flow to first buffer tank in proper order, the second buffer tank, and record the time quantum respectively, the time difference through two time quantum formation, combine the holistic length of tube side, the length of extension tube, can be comparatively accurate confirm the leak source apart from the distance of tube side import or export, and then according to the length of known heat exchange tube, confirm that the leak source specifically appears on which heat exchange tube, guarantee the accuracy of leak hunting, avoid appearing lou examining. The whole tube pass is fished out manually, the heat exchange tube with the leakage point is replaced in a targeted manner or the leakage point is repaired, and then the maintenance task can be completed. In addition, the tube pass of the steam heat exchange tube can be quickly subjected to leakage detection in the interval time of steam source maintenance or suspension, the risk of potential safety hazards caused by the fact that media in the shell pass are leaked to the tube pass and then discharged to a downstream process is effectively reduced, and production safety is guaranteed.
2. The distance between the first valve and the tube pass inlet is the same as that between the second valve and the tube pass outlet in the step 1), the size of the first connecting pipe is the same as that of the second connecting pipe in the step 2), the distance between the connecting end of the first connecting pipe and the tube pass inlet is the same as that between the connecting end of the extension pipe and the tube pass outlet, and the error of leak point position detection is reduced as much as possible.
3. Step 2) first buffer tank, step 3) second buffer tank are transparent jar of body, and all are provided with the liquid level scale on the lateral wall, make things convenient for maintainer to observe the shell side medium that flows to each buffer tank, and through setting up the liquid level scale, maintainer can set for and stop the timing when reaching the same liquid level height, satisfy maintainer's actual demand.
The following further description is made with reference to the accompanying drawings and detailed description.
Drawings
FIG. 1 is a schematic diagram of a modified structure of a steam heat exchanger to be leak detected according to the present invention.
In the attached drawings, 1 is a first connecting pipe, 2 is a first buffer tank, 3 is a second connecting pipe, 4 is a second buffer tank, 5 is an extension pipe, a is a first valve, b is a second valve, c is a third valve, and d is a fourth valve.
Detailed Description
Example 1
Referring to fig. 1, for simplicity of flow, applicants conducted leak testing on the tube side of a steam heat exchanger having a tube side length of 0.8m × 5 (serpentine), comprising the steps of:
1) The steam source is closed, a first valve a is arranged at the outward extending end of the inlet of the tube side of the steam heat exchanger to be leaked, a second valve b is arranged at the outward extending end of the outlet of the tube side of the steam heat exchanger to be leaked, the distance between the first valve and the tube side inlet is the same as the distance between the second valve and the tube side outlet, obviously, the inlet of the tube side is positioned at the top of the steam heat exchanger, and the outlet of the tube side is positioned at the bottom of the steam heat exchanger according to the characteristics of the steam heat exchanger;
2) A first connecting pipe 1 is arranged at the outward extending end of an inlet of a tube side of the steam heat exchanger to be detected to leak and is positioned at the downstream of a first valve, a first buffer tank 2 is arranged on the first connecting pipe, a third valve c is arranged at the top of the first buffer tank, the first buffer tank is a transparent tank body, and a liquid level scale is arranged on the side wall of the first buffer tank;
3) An extension pipe 5 which vertically extends upwards is arranged at the extending end of the outlet of the tube side of the steam heat exchanger to be detected to leak, the extension pipe is positioned at the upstream of a second valve, the extension height of the extension pipe is h, a second connecting pipe 3 is arranged at the extension end of the extension pipe, a second buffer tank 4 is arranged on the second connecting pipe, a fourth valve d is arranged at the top of the second buffer tank, the second buffer tank is a transparent tank body, a liquid level scale is arranged on the side wall of the second buffer tank, the heights of the first connecting pipe and the second connecting pipe are the same, specifically, the specification of the extension pipe is the same as that of the tube side, a heat exchange pipe can be directly adopted, the second connecting pipe is the same as that of the first connecting pipe in the step 2), and the distance between the connecting end of the first connecting pipe and the inlet of the tube side is the same as that between the connecting end of the extension pipe and the outlet of the tube side;
4) Closing the first valve and the second valve, respectively connecting the third valve and the fourth valve with a high-pressure air source, opening the third valve and the fourth valve, exhausting residual media in a pipe pass, and closing the third valve and the fourth valve;
5) The third valve is connected with the liquid ring vacuum pump, after the operation is stable, the third valve is opened, timing is started until the liquid level height in the first buffer tank is reached (liquid flows in), and the timing is stopped for 2.4s;
6) Repeating the step 4);
7) The fourth valve is connected with the liquid ring vacuum pump, after the operation is stable, the fourth valve is opened, timing is started until the liquid level height in the second buffer tank is reached (liquid flows in), and the timing is stopped for 7.2s;
8) The length of the tube pass of the steam heat exchanger to be detected is known and is recorded as 0.8m x 5, the length of a tube pass leakage point from a first buffer tank is set as x, the flow velocity of process media in the tube pass in the step 5) and the step 7) is the same,
then x/t1= (s-x + h)/t 2, and in combination with the single tube length of the tube side, x is 1.2m, that is, according to fig. 1, it is determined that the heat exchange tube with the leak hole is the second heat exchange tube counted from the tube side inlet, and the leak detection operation is completed.
Example 2
The other steps are operated according to the embodiment 1, except that the time of the step 5) is 1.6s, the time of the step 7) is 8s, and the calculation x is 0.8m, namely, according to the figure 1, the heat exchange tube with the leakage hole is determined to be the first heat exchange tube counted from the tube side inlet, and the leakage detection operation is completed.
Claims (6)
1. A leak detection method for a tube pass of a steam heat exchanger is characterized by comprising the following steps:
1) Closing a steam source, arranging a first valve at an outward extending end of an inlet of a tube pass of the steam heat exchanger to be detected to leak, and arranging a second valve at an outward extending end of an outlet of the tube pass of the steam heat exchanger to be detected to leak;
2) A first connecting pipe is arranged at the outward extending end of the inlet of the tube side of the steam heat exchanger to be detected to leak and is positioned at the downstream of the first valve, a first buffer tank is arranged on the first connecting pipe, and a third valve is arranged at the top of the first buffer tank;
3) An extension pipe which vertically extends upwards is arranged at the extending end of the outlet of the tube pass of the steam heat exchanger to be detected to leak and is positioned at the upstream of the second valve, the extension height of the extension pipe is h, a second connecting pipe is arranged at the extending end of the extension pipe, a second buffer tank is arranged on the second connecting pipe, a fourth valve is arranged at the top of the second buffer tank, and the first connecting pipe and the second connecting pipe are the same in height;
4) Closing the first valve and the second valve, respectively connecting the third valve and the fourth valve with a high-pressure air source, opening the third valve and the fourth valve, exhausting residual media in a pipe pass, and closing the third valve and the fourth valve;
5) The third valve is connected with the negative pressure source, and the third valve is openedStarting timing till the first buffer tank has liquid level height, stopping timing, and recording as time t 1 ；
6) Repeating the step 4);
7) The fourth valve is connected with the negative pressure source, the fourth valve is opened, timing is started until the liquid level height in the second buffer tank is the same as the liquid level height in the first buffer tank, timing is stopped, and the time is recorded as the time t 2 ；
8) The length of the tube pass of the steam heat exchanger to be detected to leak is known and is recorded as s, the length of the tube pass leakage point from the first buffer tank is set as x, the flow velocity of the process medium in the tube pass in the step 5) and the step 7) is the same,
and then x/t1= (s-x + h)/t 2, and the heat exchange tube with the leakage hole can be determined by combining the length of the single tube of the tube pass, so that the leakage detection operation is completed.
2. The leak detection method for the tube side of the steam heat exchanger according to claim 1, characterized in that: step 1) the distance between the first valve and the tube side inlet is the same as the distance between the second valve and the tube side outlet.
3. The leak detection method for the tube side of the steam heat exchanger according to claim 1, characterized by comprising the following steps: and 2) the first connecting pipe and the second connecting pipe in the step 3) have the same size, and the distance between the connecting end of the first connecting pipe and the pipe side inlet is the same as the distance between the connecting end of the extension pipe and the pipe side outlet.
4. The leak detection method for the tube side of the steam heat exchanger according to claim 1, characterized by comprising the following steps: and 5) and 7), wherein the negative pressure sources are all liquid ring vacuum pumps, and the provided vacuum degrees are the same.
5. The leak detection method for the tube side of the steam heat exchanger according to claim 1, characterized by comprising the following steps: step 2) the first buffer tank and step 3) the second buffer tank are transparent tanks, and liquid level scales are arranged on the side walls of the transparent tanks.
6. The leak detection method for the tube side of the steam heat exchanger according to claim 1, characterized in that: and 4) the high-pressure gas source is a high-pressure nitrogen source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191544.1A CN115435988A (en) | 2022-09-28 | 2022-09-28 | Leakage detection method for tube pass of steam heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191544.1A CN115435988A (en) | 2022-09-28 | 2022-09-28 | Leakage detection method for tube pass of steam heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115435988A true CN115435988A (en) | 2022-12-06 |
Family
ID=84251544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211191544.1A Pending CN115435988A (en) | 2022-09-28 | 2022-09-28 | Leakage detection method for tube pass of steam heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115435988A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109835A (en) * | 2023-10-20 | 2023-11-24 | 天合光能股份有限公司 | Monitoring device of water cooler in polycrystalline silicon preparation system |
-
2022
- 2022-09-28 CN CN202211191544.1A patent/CN115435988A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109835A (en) * | 2023-10-20 | 2023-11-24 | 天合光能股份有限公司 | Monitoring device of water cooler in polycrystalline silicon preparation system |
| CN117109835B (en) * | 2023-10-20 | 2024-04-05 | 天合光能股份有限公司 | Monitoring device of water cooler in polycrystalline silicon preparation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115435988A (en) | Leakage detection method for tube pass of steam heat exchanger | |
| CN206300758U (en) | One kind tube bank pressure test leak-detecting device | |
| CN112808714A (en) | Pipeline pre-purging system and method suitable for supercritical carbon dioxide Brayton cycle | |
| CN208704529U (en) | A kind of Mobile Online's cleaning device suitable for condenser | |
| CN207628087U (en) | A kind of combustion engine compressor air filter core clearing apparatus | |
| CN213031895U (en) | Container material leakage treatment device for methane chloride workshop | |
| CN210979332U (en) | Water bath type vaporizer with single tank and multiple tube bundles | |
| CN203848271U (en) | Recovering device for steam exhausted by deaerator | |
| CN208704528U (en) | A kind of wind disturbance scaler system of heat exchanger | |
| CN106838873A (en) | A kind of steam drainage flash vessel of anti-carbonated drink erosion | |
| CN214307075U (en) | Steam blowpipe system of supercritical carbon dioxide boiler | |
| CN101419028B (en) | Safety leakage proof structure for air cooling device for gas stove | |
| CN207316474U (en) | A kind of CNG decompression units | |
| CN218787182U (en) | Vacuum suction device | |
| CN214247757U (en) | Gas blower with balance pipe | |
| CN201163020Y (en) | Water storage tank of closed circulating phase-change heat distribution system of industrial boiler | |
| CN111594818B (en) | Device for effectively reducing temperature of boiler steam main pipe and using method thereof | |
| CN218982573U (en) | Dredging device for mouth of blowing instrument pipe | |
| CN212177232U (en) | Multistage water seal for saturated steam power generation vacuum system | |
| CN219008741U (en) | Nitrogen sealing protection device for toluene storage tank | |
| CN215560104U (en) | Compressor one-stage exhaust separation system with liquid-phase refrigerant recovery function | |
| CN214467880U (en) | Device for rapidly pumping out toxic gas in zero-meter vacuum hot well tank under negative pressure | |
| CN219798623U (en) | Leakage detection system for cooling water pipe of primary cooler | |
| CN219141548U (en) | Steam condensate recycling system | |
| CN208980368U (en) | High-pressure spray type oxygen-eliminating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |