CN102589813A - Leakage check method for main heat exchanger leakage of air separation plant - Google Patents
Leakage check method for main heat exchanger leakage of air separation plant Download PDFInfo
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- CN102589813A CN102589813A CN2012100440905A CN201210044090A CN102589813A CN 102589813 A CN102589813 A CN 102589813A CN 2012100440905 A CN2012100440905 A CN 2012100440905A CN 201210044090 A CN201210044090 A CN 201210044090A CN 102589813 A CN102589813 A CN 102589813A
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Abstract
The invention relates to a leakage check method for the main heat exchanger leakage of an air separation plant. After an instrument error is removed and ice chest skimming sand is removed, the leakage check method comprises the following steps: sealing a liquid nitrogen inlet manifold at the bottom of a main heat exchanger and a high-pressure nitrogen gas discharging manifold at the top of the main heat exchanger; shutting off a high-pressure air manifold inlet valve at the top of the main heat exchanger and a high-pressure air manifold discharging valve at the bottom of the main heat exchanger; introducing high-pressure temporary leakage check nitrogen by the high-pressure air discharging manifold at the bottom of the main heat exchanger, wherein the pressure of the temporary leakage check nitrogen is above 3.2MPa; and finally, analyzing purity pollution. The method can be used for quickly and accurately judging which unit has air leakage, and therefore maintenance efficiency can be improved and loss brought by equipment faults is reduced.
Description
Technical field
The present invention relates to chemical field, be specifically related to a kind of air separation plant main heat exchanger and reveal leak testing process.
Background technology
Air separation plant is to be raw material with the air, and the method through the compression cycle cryogenic refrigeration is progressively isolated the equipment of inert gases such as oxygen, nitrogen and argon gas to the air liquefy again from liquefied air through rectifying.Generally include: power system (compressor), cleaning system, heat-exchange system, distillation system, induction system, storage system and control system etc.And heat-exchange system mainly is made up of heat exchanger; Main heat exchanger is divided into 3 unit; The processing medium top is into three to go out, and is respectively: pressure-air 7.0MPa (advancing), high pressure oxygen 6.5MPa (going out), high pressure nitrogen 3.8MPa (going out), the dirty nitrogen 36Kpa (going out) of low pressure.The bottom is: three advance one goes out, and is respectively: pressure-air (going out), liquid nitrogen (advancing), liquid oxygen (advancing), dirty nitrogen (advancing).Four kinds of process gas media putting in order in each unit is the dirty nitrogen → hyperbaric oxygen of low pressure → pressure-air → elevated pressure nitrogen.
When leaking appears in main heat exchanger, can cause the ultra normal index of high pressure nitrogen oxygen purity, and no evident regularity property variation usually fluctuated, bring serious potential safety hazard can for the subsequent production operation.And 3 unit are arranged in the main heat exchanger of air separation unit usually, and therefore to fix a breakdown, just need to judge it specifically is that leakage has appearred in which unit quickly and accurately, and still lack a kind of effective leakage detection means at present.
Summary of the invention
Therefore, the present invention is directed to above-mentioned defective, provide a kind of air separation plant main heat exchanger to reveal leak testing process, comprising: get rid of site error and with ice chest take off the sand cleaning clean after, carry out following operation:
1) the liquid nitrogen inlet manifold of sealing main heat exchanger bottom and the high pressure nitrogen discharge manifold at top;
2) close the pressure-air house steward air intake valve at main heat exchanger top and the pressure-air house steward vent valves of bottom;
3) the pressure-air discharge manifold by the main heat exchanger bottom imports the interim leak test nitrogen of high pressure, and this interim leak test nitrogen gas pressure is more than the 3.2MPa;
4) purity contamination analysis: each makes a call to the aperture of a Φ 5-10mm on the high pressure nitrogen delivery pipe at top, three unit of main heat exchanger respectively, and suitable with leakage rate by the liquid nitrogen inlet manifold importing of main heat exchanger bottom again, purity is 99.9% O
2, oxygen purity is detected at the aperture place on the high pressure nitrogen delivery pipe of each unit of main heat exchanger, and the unit that oxygen purity descends is exactly a leakage unit.
In the said method,,, also should seal like liquid nitrogen draft tube and delivery pipe etc. as also having other inlet and outlet piping on the equipment.
In the said method, the liquid nitrogen inlet manifold of main heat exchanger bottom and the high pressure nitrogen discharge manifold at top are sealed through setting up blank flange in the step 1).
In the said method, the interim leak test nitrogen of step 3) mesohigh is to import through the vent valves on the pressure-air discharge manifold of main heat exchanger bottom.
In the said method, the aperture of on the high pressure nitrogen delivery pipe at top, three unit of main heat exchanger, beating in the step 4) is Φ 10mm.
Step 4) can also replace with in the said method: temperature analysis: high pressure nitrogen emptying valve (FV7500B) exhausting pipeline of opening each unit; Because can be when high pressure leak test nitrogen bleeds low-pressure channel with the throttling phenomenon; Therefore measure the temperature of each unit, it is exactly leakage unit that temperature prolongs the unit that reduces with emptying time.
Eliminating site error described in the said method is to connect interim pipeline through the high pressure nitrogen at a following other cover air separation unit of driving state to introduce in-line analyzer, and the data that compare are got rid of site error.In-line analyzer wherein be meant be directly installed in the production procedure, tested component parameter is carried out the instrument that automatic continuous analysis is measured.
Adopt the method among the present invention, can judge fast and accurately is that leakage has taken place in which unit on earth, thereby can improve the efficient of maintenance, less because the loss that equipment failure brought.
Description of drawings
Fig. 1 is the line distribution synoptic diagram of a radiator unit;
Fig. 2 detects each cell schematics of heating radiator when leaking.
Embodiment
For further specifying the present invention, specify in conjunction with following examples:
Embodiment 1:
Connect interim pipeline through the high pressure nitrogen at a following other cover air separation unit of driving state and introduce in-line analyzer, the data that compare are got rid of site error; After then ice chest being taken off sand cleaning totally, seal the liquid nitrogen inlet manifold of main heat exchanger bottom and the high pressure nitrogen discharge manifold at top through setting up blank flange; As also having other inlet and outlet piping on the equipment,, also should seal like liquid nitrogen draft tube and delivery pipe etc.Close the pressure-air house steward air intake valve at main heat exchanger top and the pressure-air house steward vent valves of bottom; Imported the interim leak test nitrogen of high pressure nitrogen conduct of another set of air separation unit then by main heat exchanger cold junction air main bleed valve (VLA14A valve), this leak test nitrogen gas pressure reaches 3.2MPa; Each makes a call to a Φ 10mm aperture on the high pressure nitrogen delivery pipe of three unit of main heat exchanger respectively again; Suitable with leakage rate by the liquid nitrogen inlet manifold importing of main heat exchanger bottom again, purity is 99.9% O2; Oxygen purity is detected at aperture place on the high pressure nitrogen delivery pipe of three unit then, and the unit that oxygen purity descends is leakage unit.
Embodiment 2:
Connect interim pipeline through the high pressure nitrogen at a following other cover air separation unit of driving state and introduce in-line analyzer, the data that compare are got rid of site error; After then ice chest being taken off sand cleaning totally, seal the liquid nitrogen inlet manifold of main heat exchanger bottom and the high pressure nitrogen discharge manifold at top through setting up blank flange; As also having other inlet and outlet piping on the equipment,, also should seal like liquid nitrogen draft tube and delivery pipe etc.Close the pressure-air house steward air intake valve at main heat exchanger top and the pressure-air house steward vent valves of bottom; Imported the interim leak test nitrogen of high pressure nitrogen conduct of another set of air separation unit then by main heat exchanger cold junction air main bleed valve (VLA14A valve), this leak test nitrogen gas pressure reaches 3.3MPa; Carry out temperature analysis then: the high pressure nitrogen of opening each unit is decontroled valve (FV7500B) exhausting pipeline; Because can be when high pressure leak test nitrogen bleeds low-pressure channel with the throttling phenomenon; Therefore measure the temperature of each unit, it is exactly leakage unit that temperature prolongs the unit that reduces with emptying time.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (6)
1. an air separation plant main heat exchanger is revealed leak testing process, it is characterized in that: get rid of site error and ice chest is taken off the sand cleaning operate as follows after clean:
1) the liquid nitrogen inlet manifold of sealing main heat exchanger bottom and the high pressure nitrogen discharge manifold at top;
2) close the pressure-air house steward air intake valve at main heat exchanger top and the pressure-air house steward vent valves of bottom;
3) the pressure-air discharge manifold by the main heat exchanger bottom imports the interim leak test nitrogen of high pressure, and this interim leak test nitrogen gas pressure is more than the 3.2MPa;
4) purity contamination analysis: each makes a call to the aperture of a Φ 5-10mm on the high pressure nitrogen delivery pipe at top, three unit of main heat exchanger respectively, and suitable with leakage rate by the liquid nitrogen inlet manifold importing of main heat exchanger bottom again, purity is 99.9% O
2, oxygen purity is detected at the aperture place on the high pressure nitrogen delivery pipe of each unit of main heat exchanger, and the unit that oxygen purity descends is exactly a leakage unit.
2. air separation plant main heat exchanger according to claim 1 is revealed leak testing process; It is characterized in that: step 4) is: temperature analysis: the high pressure nitrogen atmospheric valve exhausting pipeline of opening each unit; Measure the temperature of each unit, temperature is exactly a leakage unit with the unit that the prolongation of emptying time reduces.
3. air separation plant main heat exchanger according to claim 1 and 2 is revealed leak testing process; It is characterized in that: getting rid of site error is to connect interim pipeline through the high pressure nitrogen at a following other cover air separation unit of driving state to be introduced in the line analysis table, and the data that compare realize.
4. air separation plant main heat exchanger according to claim 1 and 2 is revealed leak testing process, it is characterized in that: the liquid nitrogen inlet manifold of main heat exchanger bottom and the high pressure nitrogen discharge manifold at top are sealed through setting up blank flange in the step 1).
5. air separation plant main heat exchanger according to claim 1 and 2 is revealed leak testing process, it is characterized in that: the interim leak test nitrogen of step 3) mesohigh is to import through the vent valves on the pressure-air discharge manifold of main heat exchanger bottom.
6. air separation plant main heat exchanger according to claim 1 is revealed leak testing process, and it is characterized in that: the aperture of on the high pressure nitrogen delivery pipe at top, three unit of main heat exchanger, beating in the step 4) is Φ 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100440905A CN102589813A (en) | 2012-02-24 | 2012-02-24 | Leakage check method for main heat exchanger leakage of air separation plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100440905A CN102589813A (en) | 2012-02-24 | 2012-02-24 | Leakage check method for main heat exchanger leakage of air separation plant |
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| CN102589813A true CN102589813A (en) | 2012-07-18 |
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| CN2012100440905A Pending CN102589813A (en) | 2012-02-24 | 2012-02-24 | Leakage check method for main heat exchanger leakage of air separation plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319024A (en) * | 2014-07-17 | 2016-02-10 | 中国石油化工股份有限公司 | Online leakage point positioning method of air separation cold box |
| CN106762450A (en) * | 2016-11-30 | 2017-05-31 | 北京金风科创风电设备有限公司 | Air heat exchanger leakage detection system and method and wind driven generator |
| CN110967147A (en) * | 2018-09-28 | 2020-04-07 | 宝山钢铁股份有限公司 | Online searching method for damaged radiant tube of annealing furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2977789A (en) * | 1958-05-15 | 1961-04-04 | Yuba Cons Ind Inc | Heat exchange test jig |
-
2012
- 2012-02-24 CN CN2012100440905A patent/CN102589813A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2977789A (en) * | 1958-05-15 | 1961-04-04 | Yuba Cons Ind Inc | Heat exchange test jig |
Non-Patent Citations (3)
| Title |
|---|
| 李楠: "空分装置的诊断与评估", 《河南化工》 * |
| 王黎明 等: "高压主换热器通道冻堵原因的分析及处理", 《广州化工》 * |
| 郭勇: "28000m3/h空分设备主换热器泄漏判断与处理", 《深冷技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319024A (en) * | 2014-07-17 | 2016-02-10 | 中国石油化工股份有限公司 | Online leakage point positioning method of air separation cold box |
| CN106762450A (en) * | 2016-11-30 | 2017-05-31 | 北京金风科创风电设备有限公司 | Air heat exchanger leakage detection system and method and wind driven generator |
| CN110967147A (en) * | 2018-09-28 | 2020-04-07 | 宝山钢铁股份有限公司 | Online searching method for damaged radiant tube of annealing furnace |
| CN110967147B (en) * | 2018-09-28 | 2021-12-17 | 宝山钢铁股份有限公司 | Online searching method for damaged radiant tube of annealing furnace |
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Application publication date: 20120718 |