JPH01266496A - Process plant - Google Patents

Abstract

PURPOSE:To permit effective continuous washing in a tube and reduce the cost for installation, by a method wherein the heat transfer tube of a heat exchanger for cooling an auxiliary machine is formed so as to be a straight tube and the tube is connected in parallel to the heat transfer tube of a main condenser in a cooling water line to circulate washing balls. CONSTITUTION:A heat exchanger 28 for cooling an auxiliary machine is formed so as to be a single path type and titanium made straight heat transfer tubes 30 are received in a horizontal type cylinder 29. Sea water in a water intake pit 21 is distributed into respective main condensers 26 and respective beat exchangers 25 for cooling auxiliary machines respectively through a sea water screen 22, respective water intake pumps 24, respective cooling water lines 23 and respective ball washing devices 25 to cool and condense exhaust steam in respective main condensers 20 and cools auxiliary machine cooling water in the heat exchanger 28 for cooling respective auxiliary machines. Washing balls supplied from respective ball washing devices 25 into respective cooling water lines 23 are branched respectively to respective heat transfer tubes of respective main condensers 26 and respective heat transfer tubes 30 of heat exchangers 25 for cooling respective auxiliary machines and are circulated repeatedly through a ball washing unit 25 whereby the inner walls of the heat transfer tubes 30 may be washed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to process plants such as thermal power plants and nuclear power plants, and in particular, to cooling a part of the main condenser cooling system to auxiliary equipment. This relates to process plan 1 shared by the system.

(Prior Art) In a conventional nuclear power plant, a main condenser cooling system 1 shown in FIG. 5(A) and an auxiliary equipment cooling system 11 shown in FIG. 5(B) are provided independently of each other. There is.

The main condenser cooling system 1 connects titanium heat transfer tubes of a plurality of main condensers 2.2.2 to cool the exhaust steam that has been worked by a steam turbine (not shown) along a cooling water line 3. In addition, each cooling water line 3 is provided with a water intake pump 4.4.4 and a ball cleaning device 5.5.5 on the upstream side of each main condenser 2, respectively.

Each cooling water line 3 is for passing seawater as cold W water, and for example, seawater purified by a seawater screen 6 for removing foreign matter attached to a water intake bit is pumped up by each water intake pump 4, and then converted into cooling water. As each ball cleaning device 5
After that, water is passed through the heat transfer tubes of each main condenser 2 for cooling, and the cleaning balls of each ball cleaning device 5 are circulated through the heat transfer tubes according to the flow of cooling water, cleaned, and then released. Mizuguchi 1
Water will be sprayed from 7 onwards.

Each ball cleaning device 5 is configured as shown in FIG. 6, for example, and has a cooling water line 3 connected to an inlet side water chamber 2b of the main condenser 2 containing a plurality of straight heat transfer tubes 2a.
A ball supply pipe 5a is connected to the middle of the ball supply pipe 5a.

In addition, a ball recovery pipe 5b is connected to the middle of the cooling water line 3 connected to the outlet side ice chamber 2C of the main condenser 2, and a sponge-like cleaning ball 5C is connected to the ball supply pipe 5a and the ball recovery pipe 5b. They are connected via a ball recovery device 5d that collects and supplies the balls.

That is, the ball cleaning device 5 cleans the cleaning balls 5C with the main condensate i? by the flow of cooling water in the cooling water line 3. The inside of the heat exchanger tube 2a is cleaned by repeatedly circulating the inside of the heat exchanger tube 2a of s2, and a plurality of cleaning balls 5C are supplied to the cooling water line 3 from the ball supply pipe 5a.

For this purpose, the cleaning balls 5C flow into the inlet side water chamber 2b of the main condenser 2 according to the flow of cooling water indicated by thick arrows in the figure, and further flow inside each heat exchanger tube 2a, and flow into each heat exchanger tube 2a. The dirt 8 adhering to the inner wall is removed by the cleaning ball 5C,
The cleaning balls 5C are collected by a collection net 5f stretched within the cooling water line 3 of the outlet side ice compartment 2c.

The collected cleaning balls 5C pass through the ball recovery pipe 5b, are pressurized by the ball circulation pump 5e, are returned to the ball recovery device 5d, and are again supplied to the cooling water line 3 via the ball supply pipe 5a. Repeat heat transfer tube 2
Clean inside a.

On the other hand, the auxiliary equipment cooling system 11 is configured as shown in FIG. As multiple water intake pumps 14, 14.1
Pump up by 4.

This pumped seawater is transferred to the auxiliary cooling water line 15°15.1
5, and then transported to multiple seawater strainers 15.
a, 15a, and 15a, and a plurality of auxiliary equipment cooling heat exchangers 16.16°16 that cool the auxiliary equipment cooling water that cools the reactor auxiliary equipment (not shown) are cooled, and then the discharge pit 1
Spray water on 7.

Each auxiliary equipment cooling heat exchanger 16 is constructed as shown in FIG. While passing water as shown by the middle broken line arrow, each heat exchanger tube 1
Freshwater auxiliary cooling water is made to flow into the rIA 17 outside the RIA 17 as shown by the solid line arrow in the figure, and the auxiliary cooling water is cooled by the seawater cooling water via the heat transfer tube 18.

Such an auxiliary equipment cooling heat exchanger 16 converts the flow of seawater passing through each heat transfer tube 18 located at the upper part of the figure in the shell 17 into the water chamber 1.
Since the structure is configured in multiple passes so as to be reversed toward the lower heat transfer tubes 18 by 9, the body can be made smaller compared to a single pass structure in which the upper and lower heat transfer tubes 18 are connected in a straight line. I can do it.

Each main condenser 2 and each water intake pump 4 of the main condenser cooling system 1 and each water intake pump 14 and auxiliary equipment cooling heat exchanger 16 of the auxiliary equipment cooling system 11 are configured as shown in FIG. 8, for example. to 1
They are often arranged together on the floor, and the small condensing bus type mentioned above is often used as the auxiliary equipment cooling heat exchanger 16.

(Problem to be Solved by the Invention) However, in such a conventional process bran, the main condenser cooling system 1 and the auxiliary equipment cooling system 11 are provided separately, which results in high cost and However, there is a problem in that it is difficult to clean the inside of the heat transfer tubes 18 of the heat exchanger 16 for cooling auxiliary equipment.

The heat exchanger 7A16 for cooling auxiliary equipment is a multi-bus type, and the seawater flowing inside each heat transfer tube 18 is reversed by the water chamber 19, so the inside of these heat transfer tubes 18 is cleaned by the ball cleaning device 5 shown in FIG. If you try to do so, there is a possibility that the cleaning balls 5C will accumulate in the water chamber 19 and will not circulate within the heat transfer tubes 18, making it impossible to clean them.

For this purpose, it is possible to inject a chemical such as a corrosion inhibitor into the heat exchanger tube 18, but this may cause new problems such as drug contamination of the water source.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to be able to continuously and effectively clean the inside of the heat transfer tubes of a heat exchanger for cooling auxiliary equipment, and to reduce costs. Our goal is to provide process plants.

[Structure of the invention]

(Means for Solving the Problems) The present invention was made by focusing on the fact that the main condenser cooling system that cools the main condenser and the auxiliary equipment cooling system have many overlapping lines and devices. A part of the main condenser cooling system is shared by the auxiliary cooling system.

That is, the present invention includes a cooling water line through which cooling water flows, a main condenser that cools and condenses exhaust steam using a heat exchanger tube installed in the cooling water line, and a heat exchanger tube in the main condenser. In a process plant that has a ball cleaning device that circulates and cleans the cleaning balls and an auxiliary equipment cooling heat exchanger that cools cooling water that cools plant auxiliary equipment, the heat exchanger tube of the auxiliary equipment cooling heat exchanger is The cooling water line is connected in parallel to the heat exchanger tube of the main condenser, and is formed in a straight pipe shape so as to circulate the cleaning balls of the ball cleaning device.

(Function) The cooling water flowing through the cooling water line is divided into the main condenser and the heat exchanger tubes of the auxiliary equipment cooling heat exchanger to cool them.

In addition, the cleaning balls of the ball cleaning device are supplied to the main condenser and the auxiliary equipment cooling heat exchanger according to the flow of cooling water in the cooling water line, and the cleaning balls circulate inside each of these heat transfer tubes to clean each one. do.

Therefore, according to the present invention, the main condenser and the auxiliary equipment cooling heat exchanger share the cooling water line, the ball cleaning device, etc., so that costs can be reduced.

Further, since the heat exchanger tubes of the heat exchanger for cooling auxiliary equipment can be cleaned by the ball cleaning device, it is possible to prevent corrosion and erosion of the heat exchanger tubes caused by corrosion of dirt inside these heat exchanger tubes.

(Example) Examples of the present invention will be described below based on FIGS. 1 to 4.

FIG. 1 shows the main system configuration of an embodiment of the present invention. For example, a seawater screen 2 is attached to a water intake bit 21 that takes in seawater.
2 is stretched, and this seawater screen 22 removes foreign substances from seawater.

A plurality of cooling water lines 23, 23, 23 that open water intake ports in the water intake bit 21 are equipped with a water intake pump 24, 24, 24, and a ball cleaning device 25, 25 from the upstream side to the downstream side.
．． 25. Each heat transfer tube of the main condenser 26, 26, 26 that cools and condenses the exhaust steam that has done work in a steam turbine (not shown) is installed, and the downstream side of each main condenser 26, 26, 26 is installed. The cooling water lines 23, 23, 23 are collected into one, and the water outlet end of the collecting pipe is opened into the seawater in the discharge bit 27. Each ball cleaning device 25 is constructed almost in the same way as the conventional example shown in FIG. Collect these cleaning balls on the side,
The cleaning ball is repeatedly circulated inside each heat transfer tube to clean it.

And, each cooling water line 23, 23.23'km exchanges heat for cooling each auxiliary machine! Each of the heat exchanger tubes of 28.28.28 is connected in parallel to each main condenser 27.27.27, and the auxiliary cooling W cooled by each auxiliary cooling heat exchanger 28.
The water cools the auxiliary equipment (not shown) and returns to the heat exchanger 28 for cooling each auxiliary equipment.

Therefore, in this embodiment, the conventional auxiliary cooling system 11 shown in FIG. 5(B) includes a water intake bit 12, a seawater screen 13, a plurality of water intake pumps 14, Line 15, 15.15, seawater strainer 1
5a, 15a, 15a1 water discharge bits 17 can be omitted, resulting in a significant cost reduction.

The auxiliary equipment cooling heat exchanger 28 is configured in a single bus type as shown in FIG. A seawater inlet water chamber 31a and a seawater outlet ice chamber 31b are disposed at the end sides so as to communicate with each heat exchanger tube 30, respectively.

A seawater outlet 32 communicating with the seawater inlet water chamber 31a and a seawater outlet 33 communicating with the seawater outlet ice chamber 31b are opened at the axial end of the shell 29, while fresh water is provided inside 1129 on the outside of each heat transfer tube 30. I so that the auxiliary cooling water of
! 29, an auxiliary cooling water outlet 34 and an auxiliary cooling water outlet 35 are opened, and the auxiliary cooling water flows inside the shell 29 in the direction of the solid line arrow in the figure, and in each heat transfer tube 30 in the direction of the broken line arrow in the figure. It is designed to be cooled by flowing cooling water (seawater).

Each heat transfer tube 30 has a straight tube shape, and the direction of cooling water flowing in the water chamber 19 is not reversed as in the conventional example shown in FIG.
The sponge-like cleaning balls supplied from the ball cleaning device 25 to the auxiliary cooling heat exchanger 28 flow inside each heat transfer tube 30 according to the flow of cooling water, and can be prevented from accumulating in the shell 29.

Therefore, since the inside of each heat exchanger tube 30 can be effectively cleaned by the cleaning ball, it is possible to prevent corrosion of each heat exchanger tube 30 due to corrosion of contaminants inside each heat exchanger tube 30 and prevention of alcohol consumption.

Next, the operation of this embodiment will be explained.

The seawater in the water intake bit 21 is pumped up by each water intake pump 24 after foreign matter is removed by a seawater screen 22, and is further passed through each cooling water line 23 as cooling water, passed through each ball cleaning device 25, and then sent to each main return tank. The water is divided into the water container 26 and each auxiliary equipment cooling heat exchanger 28.

Therefore, seawater is branched as cooling water to each heat exchanger tube of each main condenser 26 and each heat exchanger tube 30 of each auxiliary equipment cooling heat exchanger 28, and cools the exhaust steam in each main condenser 26. At the same time as being condensed, the auxiliary cooling water in each auxiliary cooling heat exchanger 28 can be cooled.

In addition, each heat exchanger tube of each main condenser 26 and each heat exchanger tube 30 of each auxiliary equipment cooling heat exchanger 28 are provided with a plurality of cleaning balls supplied from each ball cleaning device 25 to each cooling water line 23. are separated and repeatedly circulated through the ball cleaning device 25 to clean the inner walls of these heat transfer tubes 30.

Therefore, corrosion and corrosion of each heat transfer tube of each main condenser 26 and each heat transfer tube 30 of each auxiliary equipment cooling heat exchanger 828 can be prevented.

According to this embodiment, as shown in FIG. 3, the water intake pump 24, main condenser 26, and auxiliary equipment cooling heat exchanger 28 can be arranged together on one floor. Space can be saved.

Furthermore, each main condenser 26 and each auxiliary equipment cooling heat exchanger 2
Since each of the eight heat exchanger tubes 30 can be manufactured from titanium, the life of each heat exchanger tube 30 can be extended.

FIG. 4 shows a system of another embodiment of the present invention, and the difference between this embodiment and the above embodiment is that an auxiliary cooling heat exchanger 28 is provided in the body of the main condenser 26! 1129 are integrally connected, and the main condenser 26 and the auxiliary equipment cooling heat exchanger 2 are installed in this body.
The point is that a common ice chamber 40, 41 is formed through which cooling water, which is seawater, is passed through each of the heat exchanger tubes 30 of 8.

According to this, the auxiliary equipment cooling heat exchanger 28 is connected to the main condenser 26.
Since they are integrally combined, they can be made smaller.

Note that some of the main condensers 26 are equipped with a backwashing device (not shown) that reverses the direction of cooling water flowing inside the heat transfer tubes to clean the insides of the tubes. The backwashing device may be configured to be shared by each auxiliary equipment cooling heat exchanger 28.

〔Effect of the invention〕

As explained above, the present invention shares a part of the main condenser cooling system with the auxiliary equipment cooling system, thereby making it possible to reduce costs. Since the heat transfer tubes can be cleaned by the ball cleaning device of the main condenser cooling system, corrosion and erosion of the heat transfer tubes can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of main parts on the actual flow side of a process plant according to the present invention, Fig. 2 is a diagram showing the configuration inside the heat exchanger for cooling auxiliary equipment shown in Fig. Fig. 4 is a main part system configuration diagram showing only one main part of another embodiment of the present invention, Fig. 5 (A> is a conventional main condenser cooling system) 5(B) is a system configuration diagram of a conventional auxiliary equipment cooling system. FIG. 6 is a diagram for explaining the configuration and operation of the ball cleaning device shown in FIG. 5(A). Figure 7 is a block diagram of the accessory cooling heat exchanger of the accessory cooling system shown in Figure 5 (B), and Figure 8 is the conventional main condenser shown in Figures 5 (A) and (B), respectively. It is an equipment layout diagram of the cooling system and the auxiliary equipment cooling system. 23... Cooling water line, 25... Ball cleaning device,
26... Main condenser, 28... Auxiliary equipment cooling heat exchanger,
30... Heat exchanger tube. Representative Patent Attorney Nori Chika Ken Previously Ken Komaru F5 Figure 1 Figure 2 Figure 4 Figure 7 Figure 8

Claims (1)

[Claims] A cooling water line through which cooling water flows, a main condenser that cools and condenses exhaust steam using a heat transfer tube installed in this cooling water line, and a cleaning ball that circulates within the heat transfer tube of this main condenser. In a process plant that has a ball cleaning device that cleans the balls by cleaning the auxiliary equipment, and an auxiliary equipment cooling heat exchanger that cools cooling water that cools the plant auxiliary equipment, the heat exchanger tubes of the auxiliary equipment cooling heat exchanger are connected to the cooling water line. A process plant characterized in that the process plant is connected in parallel to the heat exchanger tube of the main condenser and formed in a straight tube shape so as to circulate the cleaning balls of the ball cleaning device.