CN111594818A - Device for effectively reducing temperature of boiler steam main pipe and using method thereof - Google Patents
Device for effectively reducing temperature of boiler steam main pipe and using method thereof Download PDFInfo
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- CN111594818A CN111594818A CN202010556226.5A CN202010556226A CN111594818A CN 111594818 A CN111594818 A CN 111594818A CN 202010556226 A CN202010556226 A CN 202010556226A CN 111594818 A CN111594818 A CN 111594818A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
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Abstract
The invention relates to the technical field of boiler steam, in particular to a device for effectively reducing the temperature of a boiler steam main pipe and a using method thereof, wherein the device comprises a boiler main steam main pipe, a first steam header, a standby boiler and an instrument gas box, a first steam pipeline is communicated between the boiler main steam main pipe and the first steam header, a first guide shower and a second guide shower are sequentially arranged between a first steam collecting valve and the first steam header, a first nitrogen pipeline is communicated between a differential pressure type flowmeter and the instrument gas box, and a second nitrogen pipeline is communicated between a pressure gauge and the first nitrogen pipeline; the latter utilizes nitrogen pressure and top-down nitrogen gravity to drive the steam that is gone into a little and is stricken off first steam pipeline, reduces first steam pipeline and steam-combining valve temperature. The device is simple, the process operation is simple and convenient, the temperature of the steam pipeline of the standby boiler can be quickly reduced, the normal production is not influenced, the material of the steam pipeline cannot be damaged, and the economic loss of passive shutdown of enterprises is greatly reduced.
Description
Technical Field
The invention relates to the technical field of boiler steam, in particular to a device for effectively reducing the temperature of a boiler steam main pipe and a using method thereof.
Background
Three high-pressure boilers (steam rated parameters 9.8MPa and 540 ℃) are involved in the chemical production process and are respectively a first boiler, a second boiler and a third boiler, three steam pipelines of the three boilers are respectively provided with three steam combining valves, and superheated steam is communicated with the same main steam pipeline through the steam pipeline parallel valves. Because of second boiler and the operation of third boiler, first boiler is reserve, and first boiler steam-parallel valve is in the closed condition, and operation boiler steam temperature can be through main steam pipeline, the parallelly connected valve of reserve boiler steam pipeline with heat conduction mode to reserve boiler steam pipeline heat transfer, makes reserve boiler steam pipeline temperature be high or low. The parallel steam valve is subject to thermal expansion, so that the valve seat and the sealing surface of the parallel steam valve deviate from the original positions, a small amount of steam is connected into the steam pipeline of the first boiler in series, and the temperature is continuously raised to about 100 ℃. And the pressure of the first boiler steam pipeline needs to be detected below 50 ℃, so that the temperature of the first boiler steam pipeline needs to be reduced, otherwise, the pressure pipeline detection of the standby boiler steam pipeline cannot be normally carried out.
Many chemical industry production enterprises in China often adopt the mode of stopping running the furnace and naturally cooling to cooperate with the detection of the pressure pipeline of the standby boiler when meeting the condition. Stopping the operation of the furnace seriously affects normal chemical production, so that the economic benefit of enterprises is damaged. In addition, the natural cooling time is long, the production stop time of chemical production is prolonged, and the economic benefit of enterprises is also influenced.
Disclosure of Invention
The invention provides a device for effectively reducing the temperature of a boiler steam main pipe and a using method thereof, overcomes the defects of the prior art, and can effectively solve the problems that the temperature of the boiler steam pipe is high and the pressure pipe cannot be timely detected when the pressure pipe of a steam pipe of a standby boiler is detected.
One of the technical schemes of the invention is realized by the following measures: a device for effectively reducing the temperature of a boiler steam main pipe and a using method thereof comprise a boiler main steam main pipe, a first steam collecting box, a standby boiler and an instrument gas box, wherein a boiler main steam main pipe is fixedly communicated with a lower air outlet of the standby boiler, a first steam pipeline is fixedly communicated between the boiler main steam main pipe and a lower air inlet of the first steam collecting box, a first steam trap valve is fixedly arranged on the first steam pipeline, a first guide shower and a second guide shower are sequentially arranged on the first steam pipeline between the first steam trap valve and the lower air inlet of the first steam collecting box, a differential pressure type flowmeter is fixedly arranged on the first steam pipeline between the second guide shower and the lower air inlet of the first steam collecting box, a first nitrogen pipeline is fixedly communicated between the differential pressure type flowmeter and the air outlet of the first steam collecting box, and a pressure gauge is fixedly arranged on the first steam pipeline between the first nitrogen pipeline and the lower air inlet of the first steam collecting box, a second nitrogen pipeline is communicated between the pressure gauge and the first nitrogen pipeline, a second steam valve is fixedly installed on the first steam pipeline between the second nitrogen pipeline and the air inlet at the lower part of the first steam header, a first guide shower, a second guide shower and valves are connected in series on the first nitrogen pipeline and the second nitrogen pipeline.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the first steam pipes in front of and behind the first branch steam valve are communicated with parallel pipelines, and valves are connected in series on the parallel pipelines.
A thermometer is fixedly arranged on the first steam pipe between the first nitrogen pipeline and the pressure gauge.
The second technical scheme of the invention is realized by the following measures: the use method of the device for effectively reducing the temperature of the steam main pipe of the boiler comprises the following steps: the first step, closing the first steam merging valve, the second steam merging valve and valves on parallel pipelines, and opening the valves on the first guide shower and the second guide shower; secondly, opening valves on the first nitrogen pipeline and the second nitrogen pipeline, and conveying nitrogen in the instrument gas tank into the first steam pipeline through the first nitrogen pipeline and the second nitrogen pipeline; thirdly, pressing the steam existing in the first steam pipeline out of the first steam pipeline by the nitrogen through gravity and pressure from top to bottom, and discharging trace steam through the first guide shower and the second guide shower; and fourthly, after the steam in the first steam pipeline is discharged, the temperature of the first steam pipeline and the first branch steam valve is reduced, and the first branch steam valve seat and the sealing surface are cooled and then return to a closed position.
The nitrogen pressure in the first nitrogen line and the second nitrogen line is 0.6MPa to 0.65 MPa.
The temperature of the first steam pipeline and the first steam collecting valve is reduced by 3.5 ℃ to 4.5 ℃ per hour.
The device is simple, the process operation is simple and convenient, the temperature of the steam pipeline of the standby boiler can be quickly reduced, the normal production is not influenced, the material of the steam pipeline cannot be damaged, and the economic loss of passive shutdown of enterprises is greatly reduced.
Drawings
FIG. 1 is a schematic process flow diagram of the preferred embodiment of the present invention.
The codes in the figures are respectively: 1 is the female pipe of boiler main steam, 2 is first steam header, 3 is reserve boiler, 4 is instrument gas tank, 5 is first steam pipeline, 6 is first steam valve in the lump, 7 is leading for the first way drenches, 8 is leading for the second way drenches, 9 is the differential pressure type flowmeter, 10 is first nitrogen pipeline, 11 is the manometer, 12 is second nitrogen pipeline, 13 is second steam valve in the lump, 14 is the parallel pipeline, 15 is the thermometer.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemicals mentioned in the present invention are all well known and commonly used in the art, unless otherwise specified.
The invention is further described below with reference to the following examples:
example 1: as shown in the attached drawing 1, the device for effectively reducing the temperature of the boiler steam main pipe comprises a boiler main steam main pipe 1, a first steam collection box 2, a standby boiler 3 and an instrument gas box 4, a boiler main steam main pipe 1 is fixedly communicated with a gas outlet at the lower part of the standby boiler 3, a first steam pipeline 5 is fixedly communicated between the boiler main steam main pipe 1 and a gas inlet at the lower part of the first steam collection box 2, a first steam branch steam valve 6 is fixedly arranged on the first steam pipeline 5, a first branch guide shower 7 and a second branch guide shower 8 are sequentially arranged on the first steam pipeline 5 between the first branch steam valve 6 and the gas inlet at the lower part of the first steam collection box 2, a differential pressure type flow meter 9 is fixedly arranged on the first steam pipeline 5 between the second branch shower 8 and the gas inlet at the lower part of the first steam collection box 2, a first nitrogen pipeline 10 is fixedly communicated between the differential pressure type flow meter 9 and the gas outlet of the instrument gas box 4, and a nitrogen gas pipeline 10 is fixedly arranged on the first steam pipeline 5 between the first pipeline 10 and the gas The steam trap is provided with a pressure gauge 11, a second nitrogen pipeline 12 is communicated between the pressure gauge 11 and the first nitrogen pipeline 10, a second steam trap 13 is fixedly installed on the first steam pipeline 5 between the second nitrogen pipeline 12 and the lower air inlet of the first steam header 2, and valves are connected in series on the first steam trap 7, the second steam trap 8, the first nitrogen pipeline 10 and the second nitrogen pipeline 12.
The invention utilizes the pressure of the continuously fed nitrogen and the gravity of the nitrogen from top to bottom to 'drive' the steam which is slightly connected in series out of the steam pipeline, and the temperature of the steam-combining valve is reduced by the characteristics of expansion with heat and contraction with cold of the valve, so that the valve seat of the steam-combining valve can quickly return to the seat, the tight sealing of the steam-combining valve is ensured, and simultaneously, the physical property of the nitrogen is stable, and when the nitrogen is filled into the steam pipeline, the steam pipeline cannot be corroded due to the oxygen contained in the air source. The invention not only ensures that the passive shutdown is caused without stopping the operation of the boiler when the pressure pipeline detection is carried out on the standby boiler 3, but also ensures that the shutdown is not reduced because of the shutdown, thereby prolonging the shutdown time. According to the fact that the loss of economic benefits of an enterprise is 200 ten thousand when the automobile is parked for one day, two days are needed for parking and cooling at least, and one day is needed for detection, the loss can be reduced by 600 ten thousand yuan in total.
Example 2: as shown in fig. 1, as an optimization of the above embodiment, parallel lines 14 are connected to the first steam lines 5 before and after the first parallel valves 6, and valves are connected in series to the parallel lines 14.
Example 3: as shown in FIG. 1, as an optimization of the above embodiment, a thermometer 15 is fixedly installed on the first vapor line 5 between the first nitrogen gas line 10 and the pressure gauge 11.
According to the present invention, the first nitrogen gas line 10 and the second nitrogen gas line 12 may be plastic hoses, which are convenient to disassemble and assemble.
In the invention, the first channel of guide shower 7 and the second channel of guide shower 8 are public equipment known in the prior chemical field.
Example 4: as shown in the attached figure 1, the use method of the device for effectively reducing the temperature of the steam main pipe of the boiler comprises the following steps: step one, closing valves on a first steam merging valve 6, a second steam merging valve 13 and a parallel pipeline 14, and opening valves on a first guide shower 7 and a second guide shower 8; secondly, opening valves on a first nitrogen pipeline 10 and a second nitrogen pipeline 12, and conveying nitrogen in the instrument gas box 4 into a first steam pipeline 5 through the first nitrogen pipeline 10 and the second nitrogen pipeline 12; thirdly, the nitrogen presses the steam existing in the first steam pipeline 5 out of the first steam pipeline 5 by gravity and pressure from top to bottom, and the trace steam is discharged through a first guide shower 7 and a second guide shower 8; and fourthly, after the steam in the first steam pipeline 5 is discharged, the temperature of the first steam pipeline 5 and the first branch steam valve 6 is reduced, and the first branch steam valve 6 is in a closed position after the valve seat and the sealing surface of the first branch steam valve are shrunk.
Example 5: as shown in FIG. 1, as an optimization of the above embodiment, the nitrogen pressure in the first nitrogen line 10 and the second nitrogen line 12 is 0.6MPa to 0.65 MPa.
Example 6: as shown in fig. 1, as an optimization of the above embodiment, the temperature of the first steam line 5 and the first trap 6 is reduced by 3.5 to 4.5 ℃ per hour.
The invention makes full use of the cooling characteristic curve of the pressure pipeline of the boiler, the temperature of the pipeline below 300 ℃ and the nitrogen as the cold source medium at about 30 ℃ can carry out heat convection, the temperature is reduced by 3.5 ℃ to 4.5 ℃ per hour, the requirement of the cooling characteristic curve is met, the pipeline can not be damaged due to too fast cooling, and the purpose of cooling in a reasonable cooling interval can be ensured.
In conclusion, the device is simple, the process operation is simple and convenient, the temperature of the steam pipeline of the standby boiler 3 can be quickly reduced, the normal production is not influenced, the material of the steam pipeline cannot be damaged, and the economic loss of passive production halt of enterprises is greatly reduced.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (6)
1. A device for effectively reducing the temperature of a boiler steam main pipe is characterized by comprising a boiler main steam main pipe, a first steam header, a standby boiler and an instrument gas box, wherein a boiler main steam main pipe is fixedly communicated with a lower gas outlet of the standby boiler, a first steam pipeline is fixedly communicated between the boiler main steam main pipe and a lower gas inlet of the first steam header, a first steam trap valve is fixedly arranged on the first steam pipeline, a first guide shower and a second guide shower are sequentially arranged on the first steam pipeline between the first steam trap valve and the lower gas inlet of the first steam header, a differential pressure type flowmeter is fixedly arranged on the first steam pipeline between the second guide shower and the lower gas inlet of the first steam header, a first nitrogen pipeline is fixedly communicated between the differential pressure type flowmeter and the gas outlet of the instrument gas box, and a pressure gauge is fixedly arranged on the first steam pipeline between the first nitrogen pipeline and the lower gas inlet of the first steam header, a second nitrogen pipeline is communicated between the pressure gauge and the first nitrogen pipeline, a second steam valve is fixedly installed on the first steam pipeline between the second nitrogen pipeline and the air inlet at the lower part of the first steam header, a first guide shower, a second guide shower and valves are connected in series on the first nitrogen pipeline and the second nitrogen pipeline.
2. The apparatus according to claim 1, wherein the first steam pipes before and after the first branch steam valve are connected to a parallel pipe, and the parallel pipe is connected to a valve in series.
3. The apparatus for effectively reducing the temperature of a steam main pipe of a boiler according to claim 1 or 2, wherein a thermometer is fixedly installed on the first steam pipe between the first nitrogen gas pipe and the pressure gauge.
4. A method for using the device for effectively reducing the temperature of the steam main pipe of the boiler according to claim 1, 2 or 3, which is characterized by comprising the following steps: the first step, closing the first steam merging valve, the second steam merging valve and valves on parallel pipelines, and opening the valves on the first guide shower and the second guide shower; secondly, opening valves on the first nitrogen pipeline and the second nitrogen pipeline, and conveying nitrogen in the instrument gas tank into the first steam pipeline through the first nitrogen pipeline and the second nitrogen pipeline; thirdly, pressing the steam existing in the first steam pipeline out of the first steam pipeline by the nitrogen through gravity and pressure from top to bottom, and discharging trace steam through the first guide shower and the second guide shower; and fourthly, after the steam in the first steam pipeline is discharged, the temperature of the first steam pipeline and the first branch steam valve is reduced, and the first branch steam valve seat and the sealing surface are cooled and then return to a closed position.
5. Use according to claim 4, characterized in that the nitrogen pressure in the first and second nitrogen lines is between 0.6MPa and 0.65 MPa.
6. Use according to claim 4 or 5, characterized in that the first steam line and the first trap temperature decrease by 3.5 ℃ to 4.5 ℃ per hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010556226.5A CN111594818B (en) | 2020-06-17 | 2020-06-17 | Device for effectively reducing temperature of boiler steam main pipe and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010556226.5A CN111594818B (en) | 2020-06-17 | 2020-06-17 | Device for effectively reducing temperature of boiler steam main pipe and using method thereof |
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| CN111594818A true CN111594818A (en) | 2020-08-28 |
| CN111594818B CN111594818B (en) | 2021-08-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08114301A (en) * | 1994-10-18 | 1996-05-07 | Shinryo Corp | Method for preventing corrosion of high or medium pressure steam condensate return piping |
| CN202008126U (en) * | 2010-12-28 | 2011-10-12 | 杭州华惠阀门有限公司 | Quickly opened and closed high-temperature high-pressure temperature and pressure reduction device |
| JP2016125666A (en) * | 2014-12-26 | 2016-07-11 | 三浦工業株式会社 | Fitting structure of metal touch type pressure opening valve |
| CN210373385U (en) * | 2019-07-09 | 2020-04-21 | 威立雅（哈尔滨）热电有限公司 | Steam boiler pair-air steam exhaust and drainage recovery device of circulating fluidized bed |
-
2020
- 2020-06-17 CN CN202010556226.5A patent/CN111594818B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08114301A (en) * | 1994-10-18 | 1996-05-07 | Shinryo Corp | Method for preventing corrosion of high or medium pressure steam condensate return piping |
| CN202008126U (en) * | 2010-12-28 | 2011-10-12 | 杭州华惠阀门有限公司 | Quickly opened and closed high-temperature high-pressure temperature and pressure reduction device |
| JP2016125666A (en) * | 2014-12-26 | 2016-07-11 | 三浦工業株式会社 | Fitting structure of metal touch type pressure opening valve |
| CN210373385U (en) * | 2019-07-09 | 2020-04-21 | 威立雅（哈尔滨）热电有限公司 | Steam boiler pair-air steam exhaust and drainage recovery device of circulating fluidized bed |
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| CN111594818B (en) | 2021-08-24 |
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