CN105648188A - Sulfur recovery process pipe heat treatment construction method - Google Patents
Sulfur recovery process pipe heat treatment construction method Download PDFInfo
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- CN105648188A CN105648188A CN201410667359.4A CN201410667359A CN105648188A CN 105648188 A CN105648188 A CN 105648188A CN 201410667359 A CN201410667359 A CN 201410667359A CN 105648188 A CN105648188 A CN 105648188A
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Abstract
The invention discloses a sulfur recovery process pipe heat treatment construction method. The method comprises the following steps: 2.1) the heating range of each side of a pipe with an acid gas-contained medium in the heat treatment after welding is not lower than 3 times of the width of a welding line, and is not lower than 25 mm; and the part besides a heating strip is insulated; 2.2.1) heating speed: after the temperature rises to 300 DEG C, the heating speed is not higher than 5125 /delta (DEG C/h), and is not higher than 220 DEG C/h; 2.2.2) constant-temperature time: the constant temperature of every millimeter wall thickness of 20# steel is kept by 3 minutes, and is not shorter than 30 minutes; the wall thickness of an engineering alkali liquid pipe is 5.5 mm; the constant-temperature time is determined as 30 minutes; the constant-temperature range is 600-650 DEG C; and within the constant-temperature time, the difference between the highest temperature and the lowest temperature is lower than 50 DEG C; and 2.2.3) cooling speed: the cooling speed is not higher than 6500 /delta (DEG C/h), and is not higher than 260 DEG C after the temperature is constant; and the natural cooling can be performed after the temperature is reduced to 300 DEG C. The method is reasonable in procedures and low in production cost.
Description
Technical field
The present invention relates to a kind of sulfur recovery technology pipeline heat treatment construction method.
Background technology
Existing sulfur recovery technology pipeline heat treatment construction method exists that procedure arrangement is unreasonable, operation is various, requires higher to operator's experience so that production cost is higher.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention be to provide a kind of operation rationally, the sulfur recovery technology pipeline heat treatment construction method of low cost of manufacture.
For achieving the above object, the present invention provides
A kind of sulfur recovery technology pipeline heat treatment construction method, comprises the steps:
1) heat treatment step:
1.1) need heat treated medium should pad jail before heat treatment containing sour gas pipeline, can not rock, prevent from heat treatment process deforms;
1.2) layout of temperature point is surveyed:
1.2.1) reasonable Arrangement surveys temperature point: the layout surveying temperature point should to survey temperature accurately and reliably, and representative is principle; Surveying temperature point is arranged on the upside of weld seam or downside, and the quantity surveying temperature point is arranged according to pipeline specifications and surrounding environment, and every road weld seam arranges that at least one surveys temperature point, to ensure that the temperature accuracy when thermal treatment is met in pipeline weldering;
1.2.2) stationary heat galvanic couple 16# iron wire, the survey temperature position of thermopair should be met with pipeline weldering and be in close contact, and can not rock, in case surveying in heat treatment process, temperature is inaccurate, temperature control, causes temperature drift or on the low side, it is difficult to ensure thermal treatment construction quality;
1.2.3) thermal treatment temp adopts automatic temperature measurement instrument survey record, and instrument is qualified through verification qualification;
1.3) layout of well heater
1.3.1) well heater is in weld seam both sides uniform winding centered by weld seam, is close on tube wall, can not overlapping loosen, and weld seam both sides coverage width must not be less than 50MM;
1.3.2) during thermal treatment, whole welding joint should all be heated simultaneously, and pipe ends should be closed;
1.4), the laying of insulating cotton: insulating cotton should be close on the heaters, and insulation thickness is not less than 20mm, should be incubated beyond heating zone within the scope of 100mm;
1.5) wiring: each wire of well heater, thermopair and equipment and instrument should be correctly firm, and indicates sequence number, avoids confusion;
1.6) heat-treat by processing requirement: should being improved gradually from minimum value by voltage when starting power transmission, after all normal operations, then situation carries out power transmission according to actual needs;When deviation occurs in temperature, reason to be searched in time and adjust;
1.7) heat treatment process curve: temperature is when rising to 300 �� of C, and warming temperature can not do record; When being down to 300 �� of C, cooling temperature can not do record, and other temperature sections must have continuous print record;
1.8) hardness test: respectively get three points at weld seam, heat affected zone, mother metal and measure hardness value, then inspection position circumference is uniformly distributed respectively gets the standard hardness value that its mean value is weld seam, heat affected zone, mother metal; Sampling observation number is no less than 20%; Should by clean to reduce test error for the zone of oxidation polishing on the test point surface of weld seam, heat affected zone, mother metal before hardness test; After thermal treatment, the hardness value of weld seam should meet the regulation of design document, relevant criterion or welding operation instruction; Alkali lye pipe material is 20# steel, and its hardness value is 100HB-140HB, as being greater than 140HB, need to re-start thermal treatment, until hardness test result is qualified;
1.9) workpiece after heat treatment can not welding again, hammering and bending, meet both sides should make the mark of Overheating Treatment in pipeline weldering;
2), thermal treatment process:
2.1) medium should not be less than 3 times of weld width containing the every side of heated perimeter of sour gas pipeline postweld heat treatment, and is no less than 25mm, should be incubated beyond heating zone;
2.2) thermal treatment rate of heating, constant temperature time and speed of cooling require below should meeting:
2.2.1) rate of heating: after being warming up to 300 DEG C, rate of heating should not be greater than 5125/ �� (DEG C/h), and must not be greater than 220 DEG C/h;
2.2.2) constant temperature time: 20# steel every millimeter of wall thickness constant temperature 3 minutes, and must not less than 30min; This engineering alkali lye pipeline wall thickness is 5.5MM, it is determined that constant temperature time is 30min; Its constant temperature scope is 600 �� of C, 650 �� of C, in constant temperature time, the highest should be less than 50 DEG C with minimum temperature difference;
2.2.3) speed of cooling: after constant temperature, speed of cooling should not be greater than 6500/ �� (DEG C/h), and is not more than 260 DEG C, can naturally cooling after being chilled to 300 DEG C.
The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
A kind of sulfur recovery technology pipeline heat treatment construction method, comprises the steps:
1) heat treatment step:
1.1) need heat treated medium should pad jail before heat treatment containing sour gas pipeline, can not rock, prevent from heat treatment process deforms;
1.2) layout of temperature point is surveyed:
1.2.1) reasonable Arrangement surveys temperature point: the layout surveying temperature point should to survey temperature accurately and reliably, and representative is principle; Surveying temperature point is arranged on the upside of weld seam or downside, and the quantity surveying temperature point is arranged according to pipeline specifications and surrounding environment, and every road weld seam arranges that at least one surveys temperature point, to ensure that the temperature accuracy when thermal treatment is met in pipeline weldering;
1.2.2) stationary heat galvanic couple 16# iron wire, the survey temperature position of thermopair should be met with pipeline weldering and be in close contact, and can not rock, in case surveying in heat treatment process, temperature is inaccurate, temperature control, causes temperature drift or on the low side, it is difficult to ensure thermal treatment construction quality;
1.2.3) thermal treatment temp adopts automatic temperature measurement instrument survey record, and instrument is qualified through verification qualification;
1.3) layout of well heater
1.3.1) well heater is in weld seam both sides uniform winding centered by weld seam, is close on tube wall, can not overlapping loosen, and weld seam both sides coverage width must not be less than 50MM;
1.3.2) during thermal treatment, whole welding joint should all be heated simultaneously, and pipe ends should be closed;
1.4), the laying of insulating cotton: insulating cotton should be close on the heaters, and insulation thickness is not less than 20mm, should be incubated beyond heating zone within the scope of 100mm;
1.5) wiring: each wire of well heater, thermopair and equipment and instrument should be correctly firm, and indicates sequence number, avoids confusion;
1.6) heat-treat by processing requirement: should being improved gradually from minimum value by voltage when starting power transmission, after all normal operations, then situation carries out power transmission according to actual needs; When deviation occurs in temperature, reason to be searched in time and adjust;
1.7) heat treatment process curve: temperature is when rising to 300 �� of C, and warming temperature can not do record; When being down to 300 �� of C, cooling temperature can not do record, and other temperature sections must have continuous print record;
1.8) hardness test: respectively get three points at weld seam, heat affected zone, mother metal and measure hardness value, then inspection position circumference is uniformly distributed respectively gets the standard hardness value that its mean value is weld seam, heat affected zone, mother metal; Sampling observation number is no less than 20%; Should by clean to reduce test error for the zone of oxidation polishing on the test point surface of weld seam, heat affected zone, mother metal before hardness test; After thermal treatment, the hardness value of weld seam should meet the regulation of design document, relevant criterion or welding operation instruction; Alkali lye pipe material is 20# steel, and its hardness value is 100HB-140HB, as being greater than 140HB, need to re-start thermal treatment, until hardness test result is qualified;
1.9) workpiece after heat treatment can not welding again, hammering and bending, meet both sides should make the mark of Overheating Treatment in pipeline weldering;
2), thermal treatment process:
2.1) medium should not be less than 3 times of weld width containing the every side of heated perimeter of sour gas pipeline postweld heat treatment, and is no less than 25mm, should be incubated beyond heating zone;
2.2) thermal treatment rate of heating, constant temperature time and speed of cooling require below should meeting:
2.2.1) rate of heating: after being warming up to 300 DEG C, rate of heating should not be greater than 5125/ �� (DEG C/h), and must not be greater than 220 DEG C/h;
2.2.2) constant temperature time: 20# steel every millimeter of wall thickness constant temperature 3 minutes, and must not less than 30min; This engineering alkali lye pipeline wall thickness is 5.5MM, it is determined that constant temperature time is 30min; Its constant temperature scope is 600 �� of C, 650 �� of C, in constant temperature time, the highest should be less than 50 DEG C with minimum temperature difference;
2.2.3) speed of cooling: after constant temperature, speed of cooling should not be greater than 6500/ �� (DEG C/h), and is not more than 260 DEG C, can naturally cooling after being chilled to 300 DEG C.
Claims (1)
1. a sulfur recovery technology pipeline heat treatment construction method, is characterized in that: comprise the steps:
1) heat treatment step:
1.1) need heat treated medium should pad jail before heat treatment containing sour gas pipeline, can not rock, prevent from heat treatment process deforms;
1.2) layout of temperature point is surveyed:
1.2.1) reasonable Arrangement surveys temperature point: the layout surveying temperature point should to survey temperature accurately and reliably, and representative is principle; Surveying temperature point is arranged on the upside of weld seam or downside, and the quantity surveying temperature point is arranged according to pipeline specifications and surrounding environment, and every road weld seam arranges that at least one surveys temperature point, to ensure that the temperature accuracy when thermal treatment is met in pipeline weldering;
1.2.2) stationary heat galvanic couple 16# iron wire, the survey temperature position of thermopair should be met with pipeline weldering and be in close contact, and can not rock, in case surveying in heat treatment process, temperature is inaccurate, temperature control, causes temperature drift or on the low side, it is difficult to ensure thermal treatment construction quality;
1.2.3) thermal treatment temp adopts automatic temperature measurement instrument survey record, and instrument is qualified through verification qualification;
1.3) layout of well heater
1.3.1) well heater is in weld seam both sides uniform winding centered by weld seam, is close on tube wall, can not overlapping loosen, and weld seam both sides coverage width must not be less than 50MM;
1.3.2) during thermal treatment, whole welding joint should all be heated simultaneously, and pipe ends should be closed;
1.4), the laying of insulating cotton: insulating cotton should be close on the heaters, and insulation thickness is not less than 20mm, should be incubated beyond heating zone within the scope of 100mm;
1.5) wiring: each wire of well heater, thermopair and equipment and instrument should be correctly firm, and indicates sequence number, avoids confusion;
1.6) heat-treat by processing requirement: should being improved gradually from minimum value by voltage when starting power transmission, after all normal operations, then situation carries out power transmission according to actual needs; When deviation occurs in temperature, reason to be searched in time and adjust;
1.7) heat treatment process curve: temperature is when rising to 300 �� of C, and warming temperature can not do record; When being down to 300 �� of C, cooling temperature can not do record, and other temperature sections must have continuous print record;
1.8) hardness test: respectively get three points at weld seam, heat affected zone, mother metal and measure hardness value, then inspection position circumference is uniformly distributed respectively gets the standard hardness value that its mean value is weld seam, heat affected zone, mother metal; Sampling observation number is no less than 20%; Should by clean to reduce test error for the zone of oxidation polishing on the test point surface of weld seam, heat affected zone, mother metal before hardness test; After thermal treatment, the hardness value of weld seam should meet the regulation of design document, relevant criterion or welding operation instruction; Alkali lye pipe material is 20# steel, and its hardness value is 100HB-140HB, as being greater than 140HB, need to re-start thermal treatment, until hardness test result is qualified;
1.9) workpiece after heat treatment can not welding again, hammering and bending, meet both sides should make the mark of Overheating Treatment in pipeline weldering;
2), thermal treatment process:
2.1) medium should not be less than 3 times of weld width containing the every side of heated perimeter of sour gas pipeline postweld heat treatment, and is no less than 25mm, should be incubated beyond heating zone;
2.2) thermal treatment rate of heating, constant temperature time and speed of cooling require below should meeting:
2.2.1) rate of heating: after being warming up to 300 DEG C, rate of heating should not be greater than 5125/ �� (DEG C/h), and must not be greater than 220 DEG C/h;
2.2.2) constant temperature time: 20# steel every millimeter of wall thickness constant temperature 3 minutes, and must not less than 30min; This engineering alkali lye pipeline wall thickness is 5.5MM, it is determined that constant temperature time is 30min; Its constant temperature scope is 600 �� of C, 650 �� of C, in constant temperature time, the highest should be less than 50 DEG C with minimum temperature difference;
2.2.3) speed of cooling: after constant temperature, speed of cooling should not be greater than 6500/ �� (DEG C/h), and is not more than 260 DEG C, can naturally cooling after being chilled to 300 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667359.4A CN105648188A (en) | 2014-11-20 | 2014-11-20 | Sulfur recovery process pipe heat treatment construction method |
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|---|---|---|---|
| CN201410667359.4A CN105648188A (en) | 2014-11-20 | 2014-11-20 | Sulfur recovery process pipe heat treatment construction method |
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| CN105648188A true CN105648188A (en) | 2016-06-08 |
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| CN201410667359.4A Pending CN105648188A (en) | 2014-11-20 | 2014-11-20 | Sulfur recovery process pipe heat treatment construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384941A (en) * | 2018-01-09 | 2018-08-10 | 镇海石化建安工程有限公司 | A kind of the electric heating temperature device and its application method of power adjustable |
| CN109280761A (en) * | 2018-11-27 | 2019-01-29 | 四川石油天然气建设工程有限责任公司 | A kind of field acidic environment carbon steel pipe stress-removal construction operation method |
-
2014
- 2014-11-20 CN CN201410667359.4A patent/CN105648188A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384941A (en) * | 2018-01-09 | 2018-08-10 | 镇海石化建安工程有限公司 | A kind of the electric heating temperature device and its application method of power adjustable |
| CN109280761A (en) * | 2018-11-27 | 2019-01-29 | 四川石油天然气建设工程有限责任公司 | A kind of field acidic environment carbon steel pipe stress-removal construction operation method |
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Application publication date: 20160608 |
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