JP2008106684A - Method for supplying steam by steam supply pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that steam cannot be smoothly supplied to facilities having a long steam supply pipe since not only there is a risk of condensation of steam in a middle of a supply pipe especially at a start of use but also drain resides during stop of supply to easily cause water hammer at start of use, if the steam supply pipe between a supply source and a supply destination is long. <P>SOLUTION: In this method for supplying steam, a steam supply pipe including a warming up means is used. The warming up means feeds steam to the steam supply pipe 20 for warming up by gradually opening a steam supply source valve 23 or a steam flow control valve 24 divided in a plurality of steps from a closed condition to a partially opened condition with predetermined time intervals after opening an open/close valve 27 of a drain 26 with a steam supply destination valve 25 of the steam supply pipe 20 closed. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a steam supply method using a steam supply pipe having a long supply pipe.

  Conventionally, high-temperature and high-pressure steam used in steam turbines, etc. has been transported to chemical reaction equipment, product drying equipment, compressor drive equipment, etc., and reused. Since there is a risk of liquefaction, the supply source and the supply destination were performed in adjacent facilities.

  If the steam supply pipe between the supply source and the supply destination becomes long, not only may the steam be liquefied in the middle of the supply pipe, especially at the start of use, but also a drain may accumulate during the supply stop, Therefore, there is a problem that the steam cannot be smoothly supplied to the facility having a long steam supply pipe.

  Therefore, according to the present invention, a steam supply source valve is provided on the steam supply source side of the steam supply pipe so that the flow rate can be adjusted, a steam supply destination valve is provided on the steam supply destination side, and the steam supply pipe is provided. A drain having an opening / closing valve is provided in front of the supply destination valve, and before opening the steam supply destination valve, the drain supply opening / closing valve is opened, and then the steam supply source valve is closed from the closed state to the partially opened state for a predetermined time. It is intended to provide a steam supply method using a steam supply pipe having a warming means for warming by feeding steam into the steam supply pipe by gradually opening it in a plurality of steps at intervals.

  Further, according to the present invention, as described in claim 2, in the steam supply method according to claim 1, a steam supply flow rate adjusting valve is provided in the vicinity of the steam supply source valve of the steam supply pipe, and the steam supply source valve is provided. It is intended to provide a steam supply method using a steam supply pipe in which a steam supply source valve is provided so that the flow rate can be adjusted by adjusting the flow rate with a steam supply flow rate adjustment valve in a state where the valve is opened to a predetermined opening.

  Further, according to the present invention, the steam supply method according to claim 1 or 2, wherein the drain is opened with the steam supply destination valve closed before warming, and the steam supply source Opening the steam supply valve or steam supply flow rate adjustment valve stepwise to a predetermined opening by inching means consisting of intermittent opening / closing operation that opens and closes the valve or steam supply flow rate adjustment valve for a short time. The present invention intends to provide a steam supply method using a steam supply pipe that is preheated.

Further, according to the present invention, as described in claim 4, in the steam supply method according to claim 3, the opening / closing time interval by the inching means is set to a ratio of substantially open 1: closed (5 to 15). It is intended to provide a steam supply method using a steam supply pipe.
According to a fifth aspect of the present invention, there is provided the steam supply method according to the fourth aspect, wherein the open / close time interval by the inching means is set to a ratio of substantially open 1: closed 10. A steam supply method is to be provided.

Moreover, as for this invention, in the steam supply method in any one of Claims 1 thru | or 5 as described in Claim 6, the partially open state in a warming means is a 10%-20% open state. It is intended to provide a steam supply method using a steam supply pipe.
Moreover, this invention tries to provide the vapor | steam supply method of the vapor | steam supply method of Claim 6 as described in Claim 7 by the vapor | steam supply pipe | tube with a partially open state being a substantially 15% open state. Is.

  Further, according to the present invention, as described in claim 8, in the steam supply method according to any one of claims 1 to 7, the flow rate control valve opening is continuously increased from the partially open state to the half open state. It is an object of the present invention to provide a steam supply method using a steam supply pipe that continues warming.

  Further, the present invention provides the steam supply method according to any one of claims 1 to 8, wherein the rust in the pipe is discharged together with the vapor cooled and liquefied in the pipe from the drain. It is intended to provide a steam supply method using a steam supply pipe.

  Further, according to the present invention, as described in claim 10, in the steam supply method according to claim 9, a drain trap bypass valve is provided in the drain in addition to the on-off valve to discharge drainage or rust in the pipe. It is an object of the present invention to provide a steam supply method using such a steam supply pipe.

  In addition, according to the present invention, in the steam supply method according to any one of claims 1 to 10, the flow control valve opening degree is continuously maintained in a half-open state after confirming the drainage state of the drain. The present invention is to provide a steam supply method using a steam supply pipe in which warming is completed by opening a steam supply destination valve.

  Further, according to the present invention, as described in claim 12, in the steam supply method according to any one of claims 1 to 11, after the warming is completed, the flow control valve opening degree is continuously between the half-open state and the fully-open state. It is intended to provide a steam supply method using a steam supply pipe in which the flow rate is controlled by adjusting the flow rate.

  Further, according to the present invention, the steam supply method according to any one of claims 1 to 12, wherein the steam supply destination valve is adjusted after the flow rate adjustment valve opening is adjusted to a half-open state. It is intended to provide a steam supply method using a steam supply pipe which is closed and again the flow control valve opening is fully opened and then the steam supply source valve is closed.

  Further, according to the present invention, the steam supply method according to claim 13 is fully opened before the steam supply source valve is closed and the flow rate control valve opening is the same as the warming opening. It is intended to provide a steam supply method using a steam supply pipe of 15%.

  Further, the present invention is the steam supply method according to claim 14, wherein the steam supply source valve is continuously closed and the flow rate control valve is fully closed to stop the supply of steam. A steam supply method using a steam supply pipe is provided.

  According to the steam supply method of the present invention, as described in claim 1, the steam supply source valve is provided on the steam supply source side of the steam supply pipe so that the flow rate can be adjusted, and the steam supply destination valve is provided on the steam supply destination side. And providing a drain having an opening / closing valve located in front of the steam supply destination valve, and opening the drain opening / closing valve before opening the steam supply destination valve, and then partially opening the steam supply source valve from the closed state. By having a warming means for warming by feeding steam into the steam supply pipe by gradually gradual opening at a predetermined time interval at predetermined time intervals until the open state, the steam supply pipe is initially filled with a small amount of steam. The water staying inside can be discharged from the open / close valve of the drain, and by gradually increasing the flow rate of the steam, the steam supply pipe is warmed while suppressing the liquefaction of the steam, until the liquefaction of the supplied steam disappears Water Preparing the steam supply to without producing Nma phenomenon is complete effect.

  Further, according to the present invention, as described in claim 2, in the steam supply method according to claim 1, a steam supply flow rate adjusting valve is provided in the vicinity of the steam supply source valve of the steam supply pipe, and the steam supply source valve is provided. By having a configuration in which the steam supply source valve is provided so that the flow rate can be adjusted by adjusting the flow rate with the steam supply flow rate adjustment valve in a state of opening to a predetermined opening, the steam supply flow rate adjustment valve is used instead of the steam supply source valve. There is an effect that the steam flow rate of the steam supply valve can be adjusted accurately and reliably.

  Further, according to the present invention, the steam supply method according to claim 1 or 2, wherein the drain is opened with the steam supply destination valve closed before warming, and the steam supply source Opening the steam supply valve or steam supply flow rate adjustment valve stepwise to a predetermined opening by inching means consisting of intermittent opening / closing operation that opens and closes the valve or steam supply flow rate adjustment valve for a short time. In addition to being able to preheat the steam pipe by the inching means before warming, the rust generated in the pipe due to intermittent short-time jetting of steam, etc. There is an effect that can blow.

Further, according to the present invention, as described in claim 4, in the steam supply method according to claim 3, the opening / closing time interval by the inching means is set to a ratio of substantially open 1: closed (5 to 15). By having the configuration, there is an effect that the steam supply pipe can be gradually preheated.
Further, according to a fifth aspect of the present invention, in the steam supply method according to the fourth aspect, the opening / closing time interval by the inching means is set to a ratio of substantially open 1: closed 10. As a result, the steam supply pipe can be smoothly preheated.

Moreover, as for this invention, in the steam supply method in any one of Claims 1 thru | or 5 as described in Claim 6, the partially open state in a warming means is a 10%-20% open state. By having the configuration, there is an effect that warming can be performed smoothly.
Further, according to the present invention, the steam supply method according to claim 6 has a configuration in which the partially opened state is approximately 15% open, thereby ensuring warming safely. There is an effect that can be done.

  Further, according to the present invention, as described in claim 8, in the steam supply method according to any one of claims 1 to 7, the flow rate control valve opening is continuously increased from the partially open state to the half open state. By having the structure which continues warming, there exists an effect which can be warmed safely.

  Further, the present invention provides the steam supply method according to any one of claims 1 to 8, wherein the rust in the pipe is discharged together with the vapor cooled and liquefied in the pipe from the drain. By having this structure, there is an effect that the rust generated in the pipe due to the supply stop for a certain period can be discharged from the drain.

  Further, according to the present invention, as described in claim 10, in the steam supply method according to claim 9, a drain trap bypass valve is provided in the drain in addition to the on-off valve to discharge drainage or rust in the pipe. By having such a configuration, there is an effect that drainage or rust in the pipe can be reliably discharged by the drain trap bypass valve.

  In addition, according to the present invention, in the steam supply method according to any one of claims 1 to 10, the flow control valve opening degree is continuously maintained in a half-open state after confirming the drainage state of the drain. In addition, by having a configuration in which warming is completed by opening the steam supply destination valve, it is possible to reliably check the warming completion status from the drainage status of the drain, and continue to adjust the flow rate in the half-open state There is an effect that warming can be completed safely continuously by maintaining the valve opening and opening the steam supply destination valve.

  Further, according to the present invention, as described in claim 12, in the steam supply method according to any one of claims 1 to 11, after the warming is completed, the flow control valve opening degree is continuously between the half-open state and the fully-open state. By adjusting the flow rate and controlling the flow rate, after warming is completed, there is an effect that the steam can be supplied by freely adjusting the flow rate control valve.

  Further, according to the present invention, the steam supply method according to any one of claims 1 to 12, wherein the steam supply destination valve is adjusted after the flow rate adjustment valve opening is adjusted to a half-open state. It is closed, and the flow control valve opening is again fully opened, and then the steam supply source valve is closed, so that the flow rate is reduced to the half open state, the steam supply destination valve is closed, and the steam supply is stopped. After the stop, there is an effect that the flow rate adjusting valve opening degree is fully opened, the steam is distributed in the steam supply pipe, and the water staying in the drain can be drained.

  Further, according to the present invention, the steam supply method according to claim 13 is fully opened before the steam supply source valve is closed and the flow rate control valve opening is the same as the warming opening. By having a configuration of 15%, the steam supply valve is fully opened before the steam supply source valve is closed, so that the steam is spread and the inside of the steam supply pipe is dried, and the flow control valve opening is the same as the warming opening 15% It has the effect of preparing to close after raising the tube temperature.

  Further, the present invention is the steam supply method according to claim 14, wherein the steam supply source valve is continuously closed and the flow rate control valve is fully closed to stop the supply of steam. By having such a structure, there is an effect that the steam in the steam pipe can be evaporated and the pipe can be closed.

  FIG. 1 is a steam supply pipe device according to the present invention, 20 is a long steam supply pipe, and is used in a steam turbine or the like by a steam supply pipe having a length of 50 to 5000 times or more with respect to the inner diameter of the pipe. The high-temperature / high-pressure steam is intended to be transferred from the supply source pipe 21 to the chemical reaction facility, product drying facility, compressor drive device, etc. via the supply destination tube 22 and used. , 23 is a steam supply source valve, 24 is a steam flow rate adjusting valve provided on the steam supply source valve side, 25 is a steam supply destination valve, 26 is a drain pipe provided on the steam supply destination valve side, and 27 is a drain opening / closing valve. , 28 is a drain trap bypass valve, and 29 is a drain discharge port.

In the above steam supply pipe device, the distance from the steam supply source valve 23 to the steam supply destination valve 24 is about 400 m, which is about 2000 times the pipe inner diameter, by the steam supply pipe 20 made of carbon steel pipe for pressure piping with an inner diameter of 200 mm. In an embodiment in which high-temperature and high-pressure steam having a temperature of 200 ° C. or more and a pressure of 1.0 MP or more is supplied at a distance, as a preparation for air supply, the steam supply destination valve 25 is closed and step 1 of FIG. As shown in Fig. 2, the drain on / off valve 27 is opened, and after stopping for a long time, the drain trap bypass valve 28 is opened to blow rust generated in the pipe, and then the steam flow rate adjusting valve 24 is fully opened to ensure safety. The inching operation of step 2 is performed by the steam supply source valve 23 in a substantially half-open state.
Therefore, in a situation where rust or the like does not occur in the pipe after stopping for a short time, this inching operation is omitted and a warming operation described later is started.

The inching operation of Step 2 is performed by opening the steam supply source valve 23 for a short time with the flow rate of the steam flow regulating valve 24 being reduced to almost half before the warming operation is carried out in earnest as the preceding stage of the warming means. It consists of repeating intermittent opening and closing operations at long intervals to close for a long time, gradually increasing the valve opening in stages, during which preliminary heating of the steam supply pipe, The liquid or rust is to be discharged from the drain through the drain trap bypass valve 28 in advance.
In the case of the embodiment, the inching operation is performed at about 7 tons per hour when the flow rate of the steam flow control valve 24 is almost fully opened and about 13 tons per hour.
In addition, in the case of the embodiment, the inching time is repeated about 10 to 15 minutes (about 18 to 28 times) by opening the steam supply source valve 23 for 3 seconds and closing for 30 seconds. The inching operation ends when the valve opening is increased and the valve is fully opened.
In addition, it is preferable to set the program so that the valve is automatically opened and closed.

When the steam supply valve 23 is fully opened, full-scale warming is started by the steam flow rate adjusting valve 24 as described in the preceding step 3 and the succeeding step 4 of FIG.
The warming in the first stage of the previous step 3 is performed only when the flow rate of the steam flow rate adjusting valve 24 is reduced to approximately 10% to 20%.
In the embodiment, the flow rate of the steam flow control valve 24 is reduced to approximately 15% for approximately 1 hour, and the content is approximately 8% from the start of warming and approximately 5 minutes by the warming opening control. Then approximately 10% for approximately 20 minutes, then approximately 12% for approximately 15 minutes, followed by approximately 15% for approximately 20 minutes.

After confirming that there is no abnormality in the steam supply pipe 20 and the drain pipe 26, the warming in step 4 is started. The steam flow rate adjustment valve 24 is warmed continuously for about 30 minutes by increasing the flow rate control valve opening degree from a partially opened state of approximately 15% to a partially opened state of approximately 50%.
In the meantime, it is confirmed that there is no abnormality in the steam supply pipe 20 and the drain pipe 26, the drain trap bypass valve in step 5 in FIG. 2 is closed, the steam supply destination valve 25 in step 6 is opened, and the steam flow rate adjusting valve 24 is opened. Is switched from the valve opening degree control to the flow rate control, and the steam supply in step 7 is performed. Needless to say, when the steam is supplied in step 7, the steam flow rate adjusting valve 24 can supply the valve opening degree exceeding 50% to 100%.

Next, when stopping the supply of steam, as described in Step 8 of FIG. 3, the steam flow rate adjustment valve 24 is almost fully opened and is about 13 tons per hour, but in a state where the steam flow rate adjustment valve 24 is almost halved Change the flow rate setting to about 7 tons per hour.
After confirming about 7 tons per hour when the steam flow rate is approximately 50%, the steam supply valve 25 is closed as described in Step 9.
After the steam supply destination valve 25 is closed and before the steam supply source valve 23 is closed, the flow rate adjusting valve 24 is manually changed to about 13 tons per fully opened time as described in Step 10, and then the step is continued. 11, the flow rate control valve opening is set to 15%, which is the same as the warming opening, and then the steam supply valve 23 is closed as in step 12 to stop the steam supply.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of one Example of the steam supply pipe | tube apparatus which concerns on this invention. The schematic explanatory drawing explaining one embodiment of the Example. Schematic explanatory drawing explaining the other embodiment of the Example.

Explanation of symbols

20 Steam supply pipe 21 Supply source pipe 22 Supply destination pipe 23 Steam supply source valve 24 Steam flow control valve 25 Steam supply destination valve 26 Drain pipe 27 Drain opening / closing valve 28 Drain trap bypass valve 29 Drain discharge valve port

Claims (15)

A steam supply source valve is provided on the steam supply source side of the steam supply pipe so that the flow rate can be adjusted, a steam supply destination valve is provided on the steam supply destination side, and a drain having an opening / closing valve is provided in front of the steam supply destination valve. Provided, before opening the steam supply destination valve, open the drain on-off valve and then gradually open the steam supply source valve from the closed state to the partially open state at predetermined time intervals and gradually. A steam supply method using a steam supply pipe having a warming means for warming by sending steam to the steam supply pipe. 2. The steam supply method according to claim 1, wherein a steam supply flow rate adjustment valve is provided in the vicinity of the steam supply source valve of the steam supply pipe, and the flow rate is controlled by the steam supply flow rate adjustment valve with the steam supply source valve opened to a predetermined opening. A steam supply method using a steam supply pipe in which a steam supply source valve is adjusted so that the flow rate can be adjusted. 3. The steam supply method according to claim 1, wherein the drain is opened with the steam supply destination valve closed before warming, and the steam supply source valve or the steam supply flow rate adjustment valve is opened for a short time and closed for a long time. A steam supply method using a steam supply pipe in which a steam supply source valve or a steam supply flow rate adjustment valve is preliminarily heated to open to a predetermined opening stepwise by an inching means comprising intermittent opening and closing operations. The steam supply method according to claim 3, wherein the opening / closing time interval by the inching means is set to a ratio of substantially open 1: closed (5 to 15). 5. The steam supply method according to claim 4, wherein the opening / closing time interval by the inching means is set to a ratio of substantially open 1: closed 10. The steam supply method according to any one of claims 1 to 5, wherein the partially open state of the warming means is a substantially 10% to 20% open state. The steam supply method according to claim 6, wherein a partially open state is a substantially 15% open state. The steam supply method according to any one of claims 1 to 7, wherein the steam supply pipe continues warming by continuously increasing the flow rate control valve opening degree to a half-open state more than a partially open state. The steam supply method according to any one of claims 1 to 8, wherein the steam supply pipe is configured to discharge rust in the pipe together with steam cooled and liquefied in the pipe from the drain. The steam supply method according to claim 9, wherein a drain trap bypass valve is provided in the drain in addition to the on-off valve so as to discharge drainage or rust in the pipe. The steam supply method according to any one of claims 1 to 10, wherein after the drainage state of the drain is confirmed, the flow rate control valve opening is continuously maintained in a half-open state, and the steam supply destination valve is opened to complete the warming. A steam supply method using a steam supply pipe. The steam supply method according to any one of claims 1 to 11, wherein after the warming is completed, the steam is supplied by a steam supply pipe that is controlled by adjusting the flow rate control valve opening between the half-open state and the fully-open state. Method. The steam supply method according to any one of claims 1 to 12, wherein the flow control valve opening is adjusted to a half-open state, the steam supply destination valve is closed, and the flow control valve opening is again fully opened. The steam supply method by the steam supply pipe formed by closing the steam supply source valve. The steam supply method according to claim 13, wherein the steam supply pipe is fully opened before the steam supply source valve is closed and the flow rate control valve opening is set to 15%, which is the same as the warming opening. 15. The steam supply method according to claim 14, wherein the steam supply pipe is formed by continuously closing the steam supply source valve and fully closing the flow rate control valve to stop the supply of steam.

Images