JPS5970819A - Cleanup device for feed water heater and boiler plant - Google Patents

Abstract

PURPOSE:To cut down the consumption of house power, by installing the first cleanup piping, which interconnects a feed water heater in bypassing a feed water pump from piping at the downstream side of a condensate pump, and the second cleanup piping interconecting piping lying between the feed water heater and a boiler. CONSTITUTION:In time of a preboiler cleanup, pumps 12 and 13 of piping 10 are stopped, then a high pressure feed water heater's outlet valve 24 is fully opened, stopping water into a boiler 25. And, after a main valve 8 of the first cleanup piping 6 and either a valve 20 or a valve 22 are opened, when a condensate pump 3 and a booster pump 4 are driven, water inside a condenser 1 is fed to a high pressure feed water heater 18 via piping 2, 5, 6 and 17 and cleans up every apparatus on the midway past. In time of a regular boiler cleanup, these pumps 12 and 13 are stopped, making a valve 24 into full open, and when a main valve 9 of the second cleanup piping 7 is opened as well as when the condensate pump 3 and the booster pump 4 of the piping 2 are driven, water inside the condenser 1 is fed to the boiler 25 via piping 2, 5, 7, and 23 whereby every apparatus existing on the midway past are cleaned up. Therefore, the boiler cleanup can be carried out in parallel with the preboiler cleanup so that house power gets off small consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cleaning device for a feed water heater and a galley brand.

[Technical background of the invention and its problems]

In general, the feed water heaters and
In boiler plants, cleaning is performed to remove impurities such as scale and iron that have accumulated inside the plant when operating a new plant or restarting the plant after inspection.

There are two types of cleaning: pre-boiler cleaning, which is carried out to the piping in front of the boiler, and irrigated cleaning, which is carried out on the piping that includes the boiler.In both of these cleanings, water is supplied by flowing a large amount of water into the piping. When cleaning the heater, piping, and boiler, the inside of the boiler is cleaned.

In conventional cleaning equipment, the water used for cleaning passes from the condenser through the condensate S5 pump, condensate booster pump, and deaerator, and is then pressurized by the boiler feed pump or the booster pump for the boiler feed pump, and is then used for pre-boiler cleaning. was supplied to the high-pressure feedwater heater, and during boiler cleaning, it was supplied to the boiler via the high-pressure feedwater heater.

That is, when cleaning the preboiler, the high-pressure feedwater heater outlet valve is closed and cleaning is performed, and when cleaning the boiler, the high-pressure feedwater heater outlet valve is opened and cleaning is performed. Therefore, boiler cleaning cannot be carried out unless the water quality at the outlet of the high-pressure feed water heater reaches the same level as the water quality that has completed Zoreira cleaning.If both pre-boiler cleaning and boiler cleaning are required, pre-boiler cleaning must be performed first, and then this is completed. Boiler cleaning could not begin until after this.

In addition, in conventional cleaning equipment, clean-up water is once pumped to a deaerator using a condensate booster pump, and the precipitated water from the deaerator is used after being pressurized again using a boiler feed water pump or a booster pump. Therefore, with conventional cleaning equipment, it is not possible to perform preboiler cleaning and boiler cleaning in parallel, which takes a lot of time, and the pressure of precipitation from the deaerator must be raised again using the boiler feed pump or booster pump. Therefore, there was a problem in that a large amount of in-house labor was required during cleaning.

[Purpose of the invention]

The present invention eliminates the drawbacks of the conventional ones mentioned above,
To provide a cleaning device for a feed water heater/boiler plant, which can perform preboiler cleaning and boiler cleaning in parallel, and can perform the cleaning with less labor in the plant.

[Summary of the invention]

According to the present invention, the above-mentioned purpose is to connect the feed water pump from the downstream piping of the condensate pump to the first clean-up piping which communicates with the feed water heater, and to heat the feed water from the downstream piping of the Tabo pump. The second pipe that communicates with the piping between the boiler and the boiler
This is achieved by providing clean-up piping.

[Embodiments of the invention]

The present invention will be described below with reference to embodiments shown in the drawings. The figure shows a system diagram of a turbine power generation plant. In this turbine power generation plant, a condensate pump 3 and a condensate pump 3 and a Water booster pumps 4 are installed in series in this order, and water condensed by the condenser is pressurized by the condensate pump 3 and then supplied to various devices described later by the condensate booster pump 4. It has become so.

The downstream piping 5 of the condensate booster pump 4 is connected to a deaerator 11
On the other hand, a first clean-up pipe 6 and a second clean-up pipe 7 are branched from this pipe 5, and a pre-boiler cleaning source valve 8 is interposed in the middle of the first clean-up pipe 6. Further, a wheeler cleaning source valve 9 is interposed in the second clean-up piping 7.

A booster pump 12 is connected to the piping 10 from the warmer 11.
, boiler feed water pump 13 and high pressure feed water heater inlet valve 1
4 are interposed in this order. Further, this pipe 10 is provided with a narrow pass pipe 15 that bypasses the boiler water supply pump 13, and a bypass valve 16 is interposed in this narrow pass pipe 15. The pipes 6 and 10 are joined together to form a pipe 17, which is connected to a high-pressure feed water heater 18.

A pipe 19 communicating with the condenser 1 is connected to the high-pressure feed water heater 18, and a Prezeira cleaning circulation valve is installed in the pipe 19. Further, from this piping 19, an r-len piping 21 branches off on the upstream side of the circulation discrimination, and a pre-boiler cleaning drain valve 22 is interposed in this 1:run piping 21. Therefore, the water that has washed the high-pressure feedwater heater 18 is either recycled to the condenser 1 via the pipe 19 or discharged to the outside from the drain pipe 21.

The high-pressure feed water heater 18 is connected to the boiler 6 through a piping device equipped with an outlet valve, and the piping 7 from the condensate booster pump 4 is connected to the piping device on the downstream side of this outlet valve array. It is connected. A piping section and a piping 27 are connected to the boiler 5, of which the piping 27 communicates with the turbine passage and drives the bottle 4 with steam. The steam that has been used for the turbine is returned to the condenser 1 via a pipe 29. Further, a pipe n communicates with the condenser 1, and a boiler cleaning circulation valve 30 is interposed in this pipe n. Furthermore, a drain pipe 31 branches off from this pipe n on the upstream side of the circulation valve 30, and a boiler cleaning drain valve 32 is interposed in this drain pipe 31. Therefore, the water that has washed the boiler 5 is either recycled to the condenser 1 via the pipe υ, or
Alternatively, it will be discharged to the outside from the drain pipe 31.

Next, the operation of the embodiment described above will be explained.

According to the configuration of the embodiment described above, at least the following two types of routes can be considered for supplying water for pre-R cleaning.

QSore Boiler Cleaning - ■ Booster pump 12 and boiler feed water pump 13 of piping 10 are stopped, and high pressure feed water heater outlet valve is fully opened to prevent water from being supplied to boiler 5. The condensate pump 3 and the condensate booster pump 4 are then driven after opening either the preboiler cleaning source valve 8 or the circulation valve addition and drain valve 22 of the first clean-up piping 6. Then, the water in the condenser 1 is transferred to the pipe 2゜5.
, 6 , 17 to the high pressure feed water heater 18 ,
Each piece of equipment along the way and the high-pressure feed water heater 18 are cleaned.

In this case, since the high-pressure feedwater heater outlet valve is fully closed, no wash water is supplied to the boiler 5, and therefore,
This can be carried out regardless of the water quality of the cleaning iira δ. Furthermore, since the booster pump 12 and boiler feed pump 13 of the piping 10 are stopped, the labor required at the plant during this cleaning can be reduced.

0 Pre-boiler cleaning -■ Leave the pre-boiler cleaning source valve 8 of the first clean-up distribution 6 and the high-pressure feed water heater outlet valve 24 completely idle, and then clean the piping 2.
The condensate pump 3 and condensate booster pump 4 are driven, and the booster pump 12 or boiler feed water pump 13 of the piping 10 is driven to supply water in the condenser 1 to the high pressure feed water heater 18 for cleaning. do. Note that in order to perform cleaning using the booster pump 12, it is necessary to keep the pie-zoos valve 16 open.

Also in this case, since the high-pressure feed water heater outlet valve is fully closed, no cleaning water is supplied to the boiler 5, and therefore cleaning can be performed regardless of the water quality of the boiler 5. However, in addition to both pumps 3 and 4, the booster pump 12 or the boiler feed water pump 13 is driven, so
Requires a lot of in-house labor.

On the other hand, at least the following three routes are conceivable for supplying water for boiler cleaning.

0 Dayla Cleaning - ■ Stop the booster pump 12 and boiler feed water pump 13, leave the high pressure feed water heater outlet valve fully open, open the boiler wash source valve 9 of the second clean-up pipe 7, and then The condensate pump 3 and the condensate booster pump 4 are driven. Then, the water in the condenser 1 is transferred to the pipe 2,
The water is supplied to the boiler 5 through 5 and 7 degrees, and the equipment and die 25 along the way are cleaned. In this case, since the cleaning water does not pass through the high-pressure feed water heater 18, the cleaning can be carried out regardless of the water quality of the heater 18, and therefore the boiler cleaning can be carried out in parallel with the Zore boiler cleaning.

In addition, the booster pump 12 and the boiler feed pump 13
Since the plant has stopped working, there is less labor required at the plant.

0 Zeira Cleaning - ■ Booster pump 12 and boiler feed water pump 13 are stopped, boiler cleaning source valve 9 and high pressure feed water heater artificial valve 14 are left fully open, and preboiler cleaning source valve 8 of first clean-up piping 6 and After opening the high-pressure feedwater heater outlet valve, the condensate pump 3 and condensate booster pump 4 are driven. The water in the condenser 1 is then supplied from the high-pressure feed water heater 18 to the boiler 5 via the piping 2,5°6.17. In this case, since the water in the high-pressure feed water heater 18 is supplied to the boiler 5, the boiler cleaning cannot be performed until the quality of the water in the heater 18 has improved, that is, after the pre-boiler cleaning has been completed. However, since the booster pump 12 and the boiler feed water pump 13 are stopped, the in-house power can be reduced.

0 Zeila Cleaning - ■ Fully close the Zeila cleaning valve 8 and the boiler cleaning main valve 9, open the inlet valve 14 and outlet valve 24 of the high-pressure feed water heater 18, and then turn on the condensate pump 3 and the condensate booster pump 4. and booster pump 1 of piping 10.
2 and one of the boiler feed pump 13 is driven. Then, the water in the condenser 1 is supplied from the high-pressure feed water heater 18 to the boiler section via the pipes 2 , 5 , 10 , and 17 . In this case, as in Boiler Cleaning-■ mentioned above, boiler cleaning cannot be carried out until the quality of the water in the high-pressure feed water heater 18 has improved, and furthermore, since the booster pump 12 or the boiler feed water pump 13 is driven, Requires a lot of internal power.

As described above, according to the embodiments of the present invention, preboiler cleaning and boiler cleaning can be performed in various forms, but if the aforementioned preboiler cleaning -■ and boiler cleaning -■ are combined, the booster pump Pre-boiler cleaning and boiler cleaning can be performed in parallel without driving 12 and boiler feed pump 13, and less power is required in the station.

〔Effect of the invention〕

As explained above, the cleaning device for a feed water heater/boiler plant according to the present invention includes a first clean-up pipe that connects the feed water pump from the downstream pipe of the condensate pump and communicates with the feed water heater; A second clean-up piping is installed that connects the downstream piping of the condensate pump to the feed water heater and the piping between the boiler, so either or both piping can be used to perform preboiler cleaning or boiler cleaning only. Alternatively, surface cleaning can be performed in parallel, and the excellent effect is that less power is required in the facility.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of a cleaning device for a feed water heater/boiler plant according to the present invention. j... Condenser, 3... Condensate pump, 4... Condensate booster pump, 8... Preboiler cleaning source valve, 9...
Boiler cleaning source valve, 11... Deaerator, 12... Booster pump, 13... Boiler feed water pump, 14... High temperature feed water heater input. Valve, 18... High temperature feed water heater, Jun... High pressure feed water heater d Terror valve, 25... Boiler, 4... Turbine. (7317) Patent attorney Kensuke Chika (and 1 other person) □ Go to 31\ +8. 1 7-

Claims (1)

[Claims] 1. In a feed water heater/boiler plant in which a condenser, a condensate pump, a feed water pump, a high-pressure feed water heater, and a boiler are connected in this order through piping, the downstream of the condensate pump is A first clean-up piping that connects the feed water pump from the side piping to the feed water heater, and a second clean up piping that connects the downstream piping of the condensate pump to the feed water heater and the piping between the boiler. A cleaning device for a feed water heater and dyer blunt. 2. The feed water heater/diller brand cleaning device according to claim 1, wherein the first clean-up piping is provided with a preboiler cleaning source valve in the middle. 3. The feed water heater/boiler plant according to claim 1, wherein the second clean-up piping is provided with a boiler cleaning source valve on the way and is connected to the piping from the feed water heater outlet valve to the boiler. cleaning equipment.