JP6044765B2 - Temporary piping system for blowing out boiler and blowing out method - Google Patents

Description

  The present invention relates to a blowing-out temporary piping system having a foreign matter collecting device in a blowing-out performed for a boiler steam system having a main steam system and a reheat steam system, and a blowing-out by the blowing-out temporary piping system Regarding the method.

  Once the boiler has been constructed, steam is generated from the boiler itself to prevent foreign objects in the boiler from being brought into the steam turbine and damaging the steam turbine blades before venting the steam to the steam turbine. It is necessary to perform an operation of removing foreign matter from the boiler using the fluid force of this, and such an operation is generally called blowing out.

  FIG. 4 shows a boiler having a reheater 8 and a conventional blowing-out system. The boiler shown in FIG. 4 includes a main steam system A in which steam generated in the evaporator 2 is supplied to the superheater 3, the main steam pipe 4 and the high-pressure side steam turbine 5 via the steam drum 1, and the high-pressure side A steam supplied to the steam turbine 5 is supplied through a low-temperature reheat steam pipe 7 to a reheater 8, a high-temperature reheat steam pipe 9, and a reheat steam system B supplied to a middle-low pressure or low-pressure side steam turbine 10. Have.

  In the case of a boiler having a reheater 8, the reheat steam system B does not have the evaporator 2, so the system connection is a temporary pipe that connects the main steam outlet and the reheat steam system B in a form that bypasses the steam turbine 5. Blowing out is carried out by flowing the steam generated from the main steam system A to the reheat steam system B by the temporary pipe 12 for use.

  That is, the main steam system A bypasses the high-pressure side steam turbine 5 and the main steam system temporary piping 11 through which the steam flows out of the system, and the reheat steam system B has the medium-low pressure or low-pressure side steam turbine. 10 is provided with temporary piping 13 for reheat steam system through which steam flows out of the system, and each temporary piping 11, 13 is provided with shut-off valves 18, 20 to reheat the temporary piping 11 for main steam system. The steam system temporary pipe 13 is connected with a merging temporary pipe 17, and the merging temporary pipe 17 is provided with a test piece 14 for confirming the cleaning effect. A system connection temporary pipe 12 connected from the pipe 11 to the low temperature reheat steam pipe 7 is provided, and a shutoff valve 19 is provided in the system connection temporary pipe 12.

  Since the reheat steam system B is blown out using the main steam, the steam is first blown out by flowing the generated steam through the main steam system temporary piping 11 of the main steam system A, which is the steam source, and then the reheat steam. System B is blowing out.

  That is, first, the shutoff valve 18 of the main steam system temporary pipe 11 is opened, the shutoff valve 19 of the system connection temporary pipe 12 is closed, and the steam with the maximum dynamic pressure generated in the evaporator 2 for the main steam system is used as the main steam. A cleaning state of the main steam system A by blowing out is inspected by a test piece 14 provided from the system A via the main steam system temporary pipe 11 and provided in the confluent temporary pipe 17.

  Next, the shutoff valve 18 of the main steam system temporary pipe 11 is closed, the shutoff valve 19 of the system connection temporary pipe 12 is opened, the shutoff valve 20 of the reheat steam system temporary pipe 13 is opened, and the evaporator 2 The steam having a dynamic pressure larger than the maximum dynamic pressure for the main steam system generated in the above is connected from the main steam system A to the temporary connection pipe 12, the low-temperature reheat steam pipe 7, the reheat steam system B and the reheat steam system. The cleaning state by blowing out the reheat steam system B is inspected by the test piece 14 provided through the temporary pipe 13 and provided in the merging temporary pipe 17.

  The success or failure of blowing out is determined by performing blowing out under the steam condition that exceeds the maximum generated dynamic pressure against the planned steam condition that generates the largest dynamic pressure inside the boiler during boiler operation. It depends on whether foreign matter that may be scattered can be discharged out of the boiler. Whether or not the foreign matter has been discharged out of the boiler by performing the blowing out is determined by the test piece 14 installed in the steam passage portion of the merging temporary pipe 17. If there is a foreign object, the foreign object scattered by blowing out collides with the test piece 14 and a dent remains, so that it is confirmed that there is no alien substance that may damage the turbines 5 and 10 due to the dent. Out ends.

As an example, if the maximum generated dynamic pressure, which is the planned steam condition of the main steam system A, is 34,000 [N / m ² ], the steam that flows when the main steam system A blows out is 34,000 [N / m ^2]. It is necessary to make the above dynamic pressure. If the maximum generated dynamic pressure, which is the planned steam condition of the reheat steam system B, is 8,500 [N / m ² ], the steam flowing at the time of blowing out of the reheat steam system B is 8 above the maximum generated dynamic pressure. , 500 [N / m ² ] or more. However, the blowing out of the reheat steam system B causes the generated steam from the main steam system A to flow into the reheat steam system B, so the dynamic pressure in the reheat steam system B is set to 8,500 [N / m ² ] or more. In the main steam system A, a dynamic pressure of 51,000 [N / m ² ] or more is generated.

  In Patent Document 1 below, in a foreign material recovery apparatus that recovers foreign matter by removing foreign matter existing in a steam line that supplies steam generated by a boiler to a steam turbine by blowing out the bypass line, Foreign matter comprising a bent portion that bends substantially at right angles to a straight pipe line provided in the middle, and a cylindrical foreign matter collecting portion that has a backflow prevention means provided at the tip of the bent portion in the direction of vapor entry A collection device is disclosed.

  In the following Patent Document 2, a steam line for supplying steam generated by a boiler to a high-pressure steam turbine, and a configuration in which steam discharged from the steam turbine is heated again by a reheat pipe and supplied to the low-pressure steam turbine, A configuration is disclosed in which steam flows through a bypass line that bypasses the low-pressure steam turbine to blow out foreign substances present in the steam line.

JP-A-2-218803 JP 61-261604 A

The system for blowing out in the boiler having the reheater shown in Patent Document 2 and FIG. 4 has the following problems.
That is, for example, the main steam system A and the reheat steam system B shown in FIG. 4 are greatly different in operating conditions, so that the maximum dynamic pressure that can be generated inside during operation is also greatly different. Therefore, the reheat steam system B does not have the evaporator 2 even though the dynamic pressure generated in the main steam system A when blowing out the reheat steam system B is considerably larger than the blowing out of the main steam system A. For this reason, the main steam system A and the reheat steam system B are connected to each other by temporary pipes 11 and 12, and the reheat steam system B is blown out by the steam generated in the main steam system A.

  Therefore, when the reheat steam system B is blown out, an excessive dynamic pressure is applied to the main steam system A relative to the original dynamic pressure necessary to blow out the main steam system A. When the main steam system A is blown out, the foreign matter that did not scatter is scattered from the main steam system A to the reheat steam system B, so that foreign matter is supplied to the reheat steam system B and the blowing out time Has been prolonged.

In addition, the consumption of utilities such as fuel and pure water necessary for carrying out blowing out has become enormous due to prolonged blowing out time.
An object of the present invention is to solve the above-described problems. The structure of a temporary piping system for blowing out and the blowing out method capable of shortening the period required for blowing out and alleviating the management of residual foreign matters. Is to propose.

  The inventors of the present invention have made extensive studies in order to achieve the above object. (1) When blowing out the reheat steam system, the generated dynamic pressure in the main steam system increases, and the foreign matter is reheated. (2) The foreign matter once brought into the reheat steam system is difficult to scatter because it is difficult to secure a large dynamic pressure in the reheat steam system. In order to solve the problem of prolonged blowing out due to 1) and (2), it has been found that it is effective not to bring in foreign substances from the main steam system during blowing out of the reheat steam system.

The present invention has been made based on the above findings.
That is, according to the first aspect of the present invention, the steam generated in the evaporator (2) passes through the steam drum (1) to the superheater (3), the main steam pipe (4), and the high-pressure side steam turbine (5). The steam supplied to the main steam system (A) to be supplied and the steam turbine (5) on the high-pressure side passes through the low-temperature reheat steam pipe (7) and the reheater (8) and the high-temperature reheat steam pipe ( 9) and the main steam system (A) and the reheat steam system (B) prior to the start of operation of the boiler having the reheat steam system (B) supplied to the intermediate-low pressure or low pressure side steam turbine (10). In the temporary piping system for blowing out the boiler that blows
The main steam system (A) bypasses the high-pressure side steam turbine (5) and the main steam system temporary piping (11) through which steam flows out of the system and the reheat steam system (B) have medium-low pressure or low-pressure side Is provided with a temporary pipe for reheat steam system (13) that bypasses the steam turbine (10) and flows out of the system, and is connected to the temporary pipe for main steam system (11) and the temporary pipe for reheat steam system (13). Each shut-off valve (18, 20) is provided, and a merging temporary pipe (17) of each pipe (11, 13) is provided on the downstream side of each shut-off valve (18, 20), and the merging temporary pipe (17) is cleaned. A test piece (14) for confirming the effect is provided, and a low-temperature reheat steam pipe (4) is bypassed from the main steam pipe (4), bypassing the shutoff valve (18) provided in the temporary steam system temporary pipe (11). the first line connection for temporary pipe flowing steam towards 7) (12a) and the second Configure the system contact for temporary piping to flow to the inlet side of the integrated communication for temporary pipe (12b) sequentially provided superheater (3) reheater outlet side of the steam (8) (12), the first line contact The temporary pipe (12a) is provided with a shut-off valve (19), and the foreign matter collecting device (15) is provided between the first system connection temporary pipe (12a) and the second system connection temporary pipe (12b). This is a temporary piping system for blowing out a boiler.

  According to the second aspect of the present invention, the foreign matter collecting device (15) includes an inlet portion (22) connected to the first system connection temporary pipe (12a) into which vapor containing foreign matter flows, and the inlet portion (22). ) Followed by a branch part (23) for separating the foreign substance and steam, and the steam separated at the branch part (23) flows into the second system connection temporary pipe (12b) connected to the low temperature reheat steam pipe (7). A configuration in which a curved pipe portion (24) into which steam containing foreign matters remaining after flowing in, a backflow prevention portion (30) following the curved pipe portion (24), and a foreign matter collecting portion (25) are provided in sequence. The temporary piping system for blowing out a boiler according to claim 1.

The invention according to claim 3 is a boiler blowing out method using the temporary piping system for blowing out the boiler according to claim 1.
First, the shutoff valve (18) of the temporary piping for main steam system (11) is opened, the shutoff valve (19) of the temporary piping for first system communication (12a) is closed, and main steam generated in the evaporator (2). The steam with the maximum dynamic pressure for the system flows from the main steam system (A) through the main steam system temporary pipe (11) to the test piece (14) provided in the merging temporary pipe (17). ) Inspect the cleaning status by blowing out,
Next, the shut-off valve (18) provided in the main steam system temporary pipe (11) is closed, the shut-off valve (19) of the first system connection temporary pipe (12a) is opened, and the reheat steam system temporary pipe ( 13) The shut-off valve (20) provided in 13) is opened, and steam having a dynamic pressure larger than the maximum dynamic pressure for the main steam system generated in the evaporator (2) is temporarily installed from the main steam system (A) to the first system. Pipe (12a), foreign matter collecting device (15), second system connection temporary pipe (12b), low temperature reheat steam pipe (7), reheat steam system (B) and reheat steam system temporary pipe (13 In order to clean the reheated steam system B by blowing it out through the test piece (14) provided in the temporary joining pipe (17) through a sequential method. is there.

  According to the blowing out of the present invention, in the blowing out of the reheat steam system B using the main steam system A as a steam source, foreign matter that may be scattered from the main steam system A enters the reheat steam system B. By collecting in the temporary piping equipment before, foreign substances are not brought into the reheat steam system B during blowing out, and only the foreign substances originally remaining in the reheat steam system B are targeted. Blowing out can be performed.

  Accordingly, the period required for blowing out can be shortened and the consumption of utilities such as fuel and pure water can be reduced, so that an economic effect can be expected.

It is a figure which shows the system | strain of the blowout of the boiler which has a reheater of the Example of this invention. FIG. 2 (a) is a plan view, FIG. 2 (b) is a side view, and FIG. 2 (c) is an arrow A in FIG. 2 (a). (View from the direction). It is a structure figure (side view) of the foreign material collection apparatus of a prior art. It is a figure which shows the system | strain of the blowout of a boiler which has a reheater of a prior art.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a boiler with a reheater according to the invention and a blowing-out system according to the invention. An embodiment of the present invention will be described below with reference to FIG.

  A boiler shown in FIG. 1 includes a main steam system A in which steam generated in an evaporator 2 is supplied to a superheater 3, a main steam pipe 4, and a high-pressure side steam turbine 5 via a steam drum 1, and the high-pressure side A reheat steam system B in which steam supplied to the steam turbine 5 is sequentially supplied via a low temperature reheat steam pipe 7 to a reheater 8, a high temperature reheat steam pipe 9, and an intermediate low pressure or low pressure steam turbine 10; have.

  In the case of a boiler having a reheater 8, the reheat steam system B does not have the evaporator 2, and therefore the first system is a temporary pipe that connects the main steam outlet and the reheat steam system B in a form that bypasses the steam turbine 5. Blowing out is performed by flowing the steam generated from the main steam system A to the reheat steam system B by the temporary connection pipe 12a and the second system connection temporary pipe 12b.

  That is, the main steam system A is provided with a main steam system temporary pipe 11 that bypasses the high-pressure side steam turbine 5 and flows out of the system, and the reheat steam system B has a medium-low pressure or low-pressure side steam turbine 10. Are provided with temporary piping 13 for reheat steam system through which steam flows out of the system, and each temporary piping 11, 13 is provided with shut-off valves 18, 20, and is further shut off with temporary piping 11 for main steam system A valve 18 is provided.

  Furthermore, a first system connection temporary pipe 12a and a second system connection temporary pipe 12b that bypass the shut-off valve 18 provided in the main steam system temporary pipe 11 and connect to the low-temperature reheat steam pipe 7 are sequentially provided. A shutoff valve 19 is provided in the temporary piping for a single system connection 12a, and a foreign matter collecting device 15 is provided between the temporary piping for a first system connection 12a and the temporary piping for a second system connection 12b.

  Since the reheat steam system B blows out using the main steam, first, the main steam system A, which is a steam source, is connected to the main steam system temporary pipe 11 which is a temporary pipe at the outlet of the main steam pipe 4. The steam generated in A is blown out and then the reheat steam system B is blown out.

  That is, first, the shutoff valve 18 of the main steam system temporary pipe 11 is opened, the shutoff valve 19 of the first system connection temporary pipe 12a is closed, and the steam of the maximum dynamic pressure generated by the evaporator 2 for the main steam system is generated. The main steam system A is sequentially flowed toward the test piece 14 provided in the merging temporary pipe 17 via the main steam system temporary pipe 11, and the cleaning status of the main steam system A by blowing out is inspected.

  Next, the shutoff valve 18 of the primary steam system temporary pipe 11 is closed, the shutoff valve 19 of the first system connection temporary pipe 12a and the shutoff valve 20 of the reheat steam system temporary pipe 13 are opened, and the evaporator 2 From the main steam system A to the first system connection temporary pipe 12a and the second system connection temporary pipe 12b, the low-temperature reheat steam pipe 7, the reheat The reheat steam system is blown out by sequentially flowing toward the test piece 14 provided in the merging temporary pipe 17 via the steam system B, the high temperature reheat steam pipe 9 and the reheat steam system temporary pipe 13.

  When inspecting the cleaning status by this blowing out, the main steam system from the main steam system A by the foreign matter collecting device 15 provided between the first system connection temporary pipe 12a and the second system connection temporary pipe 12b. The generated foreign matter is collected by steam having a dynamic pressure larger than the maximum dynamic pressure.

  The success or failure of blowing out is determined by blowing out under the steam condition that exceeds the maximum generated dynamic pressure against the planned steam condition where the maximum dynamic pressure is generated inside the boiler during operation. It depends on whether or not foreign materials that could possibly be discharged are discharged from the boiler.

  Whether or not the foreign matter has been discharged out of the boiler by performing the blowing out is determined by the test piece 14 installed in the merging temporary pipe 17. If there are foreign objects, the foreign objects scattered by blowing out collide with the test piece 14 and leave dents. Therefore, confirm that there is no alien substance that may damage the turbines 5 and 10 by the dents. Out ends.

As an example, if the maximum generated dynamic pressure, which is the planned steam condition of the main steam system A, is 34,000 [N / m ² ], the steam that flows when the main steam system A blows out is 34,000 [N / m ^2]. It is necessary to make the above dynamic pressure. If the maximum generated dynamic pressure, which is the planned steam condition of the reheat steam system B, is 8,500 [N / m ² ], the steam flowing at the time of blowing out of the reheat steam system B is 8 above the maximum generated dynamic pressure. , 500 [N / m ² ] or more.

However, when the reheat steam system B is blown out, the generated steam from the main steam system A flows to the reheat steam system B, so the dynamic pressure is set to 8,500 [N / m ² ] or more in the reheat steam system. In the main steam system A, a dynamic pressure of 51,000 [N / m ² ] or more is generated. In the case of the boiler having the reheater 8, the reheat steam system B does not have the evaporator 2, and therefore is a temporary pipe that connects the main steam outlet and the reheat steam system B so as to bypass the steam turbines 5 and 10. 1. Blowing out is carried out by flowing the generated steam from the main steam system A to the reheat steam system B via the temporary piping 12a, 12b for connecting the second system.

  Since the reheat steam system B blows out using the main steam, the generated steam, which is the steam source, is first blown out by flowing into the main steam system temporary pipe 11 which is a temporary pipe at the outlet of the main steam pipe 4. After that, the reheating steam system B is blown out.

  The success or failure of blowing-out is determined by the blowing-out with the steam condition that exceeds the maximum generated dynamic pressure against the planned steam condition that generates the largest dynamic pressure inside the boiler. It depends on whether or not foreign materials that could possibly be discharged are discharged from the boiler. Whether or not the foreign matter has been discharged out of the boiler by performing the blowing out is determined by the test piece 14 installed in the steam passage portion provided in the temporary pipe 17 where the temporary pipes 11 and 13 merge. If there is a foreign object, the foreign object scattered by blowing out will collide with the test piece 14 and leave a dent. Therefore, confirm that there is no alien substance that may damage the turbine by the dent, and the blowing out is completed. It becomes.

As an example, if the maximum generated dynamic pressure, which is the planned steam condition of the main steam system A, is 34,000 [N / m ² ], the steam that flows when the main steam system A blows out is 34,000 [N / m ^2]. It is necessary to make the above dynamic pressure. If the maximum generated dynamic pressure, which is the planned steam condition of the reheat steam system B, is 8,500 [N / m ² ], the steam flowing at the time of blowing out of the reheat steam system B is 8 above the maximum generated dynamic pressure. , 500 [N / m ² ] or more. However, the blowing out of the reheat steam system B causes the generated steam from the main steam system A to flow into the reheat steam system B, so that the dynamic pressure in the reheat steam system B is 8,500 [N / m ² ] or more. For this purpose, the main steam system A generates a dynamic pressure of 51,000 [N / m ² ] or more.

  In the blowing out of the reheat steam system B of the present invention, the saturated steam generated in the evaporator 2 of FIG. 1 is steam-separated by the steam drum 1 and the steam superheated by the superheater 3 is used. This steam passes through the first system connection temporary pipe 12a and the second system connection temporary pipe 12b, which are temporary pipes connecting the main steam pipe 4 and the reheat steam system B, and the low temperature reheat steam pipe 7 and the reheat. Is supplied to the vessel 8 and the high-temperature reheat steam pipe 9 and discharged from the reheat steam system temporary pipe 13, which is a temporary pipe at the outlet of the reheat steam system B, to the outside of the system.

  The system connecting the main steam pipe 4 and the reheat steam system B is a temporary pipe connecting the outlet of the main steam pipe 4 and the foreign matter collecting device 15, the first system connection temporary piping 12 a, the foreign matter collecting device 15, the first By using the temporary piping 12b for connecting the two systems, foreign matter in the main steam system A brought in along with the steam from the main steam system A during the reheat steam system blowing out is collected by the foreign matter collecting device 15, and the reheat steam system Prevent foreign objects from being brought into B.

  FIG. 2 is a structural diagram of the foreign matter collecting device 15 installed between the first system connection temporary pipe 12a and the second system connection temporary pipe 12b, which are temporary piping for blowing out. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a view seen from the direction of arrow A ′ in FIG. Hereinafter, the structure of the foreign material collecting device 15 will be described with reference to FIG.

  The dynamic pressure at the inlet 22 of the foreign matter collecting device 15 connecting the first system connection temporary pipe 12a and the second system connection temporary pipe 12b is smaller than the generated dynamic pressure of the low-temperature reheat steam pipe 7. By expanding to a large diameter and reducing the flow rate of the incoming steam, foreign matter having a size or mass that is difficult to scatter in the low-temperature reheat steam pipe 7 is collected.

  The steam whose flow velocity has decreased at the branching portion 23 flows to the second system connection temporary pipe 12b that connects the foreign matter collecting device 15 and the low temperature reheat steam system 7. On the other hand, the foreign matter of the main steam system A brought along with the steam goes straight through the branching portion 23, flows as a vortex in the curved pipe portion (for example, downward elbow) 24, and flows into the foreign matter collecting portion 25. A backflow prevention plate 30 is provided at the entrance of the foreign matter collecting section 25 to prevent the collected foreign matter from backflowing and being transported to the steam again. A closing plate 26 serving as an end plate is provided at the tip of the foreign material collecting unit 25, and an openable cleaning nozzle 27 is provided on the closing plate 26, so that the foreign material 29 collected by the foreign material collecting unit 25 is collected. Has the function of cleaning.

  A complicated flow is generated by the fluid vortex generated in the portion along the inner surface of the curved pipe portion 24, and a vortex flow is generated in the central portion of the backflow prevention plate 30, so that the end plate passes through the central portion of the curved pipe portion 24. Therefore, the backflow from the straight flow to the closing plate 26 is prevented, and the outflow toward the second system connection temporary pipe 12b due to the rising of the collected foreign matter can be prevented.

  On the other hand, a conventionally known foreign material collecting apparatus is shown in FIG. In FIG. 3, the fluid containing the foreign matter from the inlet portion 36 of the pipe line travels straight through the pipe body 34 and collides with the closing plate 37 which becomes the end face of the foreign matter collecting portion 35, but is collected. The foreign matter 38 tends to flow backward at the outlet of the tube body 34. For this reason, the rising of foreign matters tends to flow out from the tube outlet portion 39 to the outside.

DESCRIPTION OF SYMBOLS 1 Steam drum 2 Evaporator 3 Superheater 4 Main steam pipe 5 High pressure turbine 6 Reheat steam system 7 Low temperature reheat steam pipe 8 Reheater 9 High temperature reheat steam pipe 10 Medium and low pressure turbine 11 Temporary piping of main steam pipe outlet 12a Temporary piping for connecting the first system 12b Temporary piping for connecting the second system 13 Temporary piping at the outlet of the reheat steam system 14 Test piece 15 Foreign material collecting device 16 Temporary piping connecting the foreign material collecting device and the reheat steam system 17 Merged temporary pipe 18, 19, 20 Shut-off valve 22 Inlet part 23 Branch part 24 Curved pipe part (downward elbow)
25 Foreign Object Collection Unit 26 Closing Plate as End Plate 27 Cleaning Nozzle 29 Collected Foreign Material A Main Steam System B Reheat Steam System

Claims (3)

A main steam system (A) in which steam generated in the evaporator (2) is supplied to the superheater (3), the main steam pipe (4) and the high-pressure side steam turbine (5) via the steam drum (1); The steam supplied to the high-pressure side steam turbine (5) passes through the low-temperature reheat steam pipe (7), the reheater (8), the high-temperature reheat steam pipe (9), and the medium-low pressure or low-pressure side steam. Prior to the start of operation of a boiler equipped with a reheat steam system (B) supplied to the turbine (10), for blowing out a boiler that blows the main steam system (A) and the reheat steam system (B) with steam. In the temporary piping system,
The main steam system (A) bypasses the high-pressure side steam turbine (5) and the main steam system temporary piping (11) through which steam flows out of the system and the reheat steam system (B) have medium-low pressure or low-pressure side A temporary pipe (13) for the reheat steam system that bypasses the steam turbine (10) and flows to the outside of the system,
The main steam system temporary pipe (11) and the reheat steam system temporary pipe (13) are provided with shut-off valves (18, 20), respectively.
A temporary junction pipe (17) for each pipe (11, 13) is provided on the downstream side of each shut-off valve (18, 20),
A test piece (14) for confirming the cleaning effect is provided in the merging temporary pipe (17),
Further, a temporary connection for the first system that allows the steam to flow from the main steam pipe (4) toward the low-temperature reheat steam pipe (7), bypassing the shut-off valve (18) provided in the temporary steam system temporary pipe (11). A temporary connection pipe (12) for connecting the system (12a) and a temporary connection pipe (12b) for connecting the second system to flow the steam on the outlet side of the superheater (3) to the inlet side of the reheater (8). Configure
The temporary piping for connecting the first system (12a) is provided with a shutoff valve (19),
A temporary piping system for blowing out a boiler, wherein a foreign matter collecting device (15) is provided between the first system connecting temporary piping (12a) and the second system connecting temporary piping (12b).   The foreign matter collecting device (15) separates the foreign matter and the vapor following the inlet portion (22) connected to the first system connection temporary pipe (12a) into which the vapor containing foreign matter flows, and the inlet portion (22). And the foreign matter remaining after the steam separated at the branch portion (23) flows into the second system connection temporary pipe (12b) connected to the low-temperature reheat steam pipe (7). The curved pipe section (24) into which steam flows, a backflow prevention section (30) following the curved pipe section (24), and a foreign matter collecting section (25) are provided in order. A temporary piping system for blowing out a boiler according to claim 1. In the boiler blowing out method using the temporary piping system for blowing out the boiler according to claim 1,
First, the shutoff valve (18) of the temporary piping for main steam system (11) is opened, the shutoff valve (19) of the temporary piping for first system communication (12a) is closed, and main steam generated in the evaporator (2). The steam with the maximum dynamic pressure for the system flows from the main steam system (A) through the main steam system temporary pipe (11) to the test piece (14) provided in the merging temporary pipe (17). ) Inspect the cleaning status by blowing out,
Next, the shutoff valve (18) provided in the main steam system temporary pipe (11) is closed, the shutoff valve (19) of the first system connection temporary pipe (12a) is opened, and the reheat steam system temporary pipe ( 13) The shut-off valve (20) provided in 13) is opened, and steam having a dynamic pressure larger than the maximum dynamic pressure for the main steam system generated in the evaporator (2) is temporarily installed from the main steam system (A) to the first system. Pipe (12a), foreign matter collecting device (15), second system connection temporary pipe (12b), low temperature reheat steam pipe (7), reheat steam system (B) and reheat steam system temporary pipe (13 ) Through a test piece (14) provided in the merging temporary pipe (17) sequentially, and inspecting the cleaning status of the reheat steam system (B) by blowing out the boiler blowing out method.

Images