JP2015031434A - Boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closed-type boiler system in which heat efficiency can be further improved.SOLUTION: A boiler system 1 includes: a boiler 10 having a can body 11 generating steam and supplying the generated steam to a load apparatus 20; a drain tank 30 recovering drain condensed and produced as a result of use of the steam by the load apparatus 20 without releasing the produced drain to the atmospheric air; and a first drain supply line L3 for supplying the drain accommodated in the drain tank 30 to the boiler 10. The boiler system further includes: a first drain circulation line L7 the base end side of which is connected to the first drain supply line L3 and the tip side of which is connected to the drain tank 30, and which makes a part of the drain circulating in the first drain supply line L3 circulate into the drain tank 30; and an air heater 14 constituting a part of the boiler 10 and exchanging heat between the drain circulating in the first drain circulation line L7 and air for combustion to be supplied to the boiler 10.

Description

  The present invention relates to a boiler system. More specifically, the present invention relates to a closed type boiler system that collects drain discharged from a load device without supplying it to the atmosphere and supplies water to the boiler.

  Conventionally, steam generated by a boiler is supplied to the load equipment, and the drain generated by condensation of the steam used as a heat source in the load equipment is collected in a sealed drain tank with pressure resistance at high temperature and pressure. And the closed type boiler system which supplies water to a boiler again is proposed (for example, refer patent document 1).

JP 2006-105442 A

  By the way, when a closed type boiler system is configured using a boiler with a relatively small capacity, the amount of drain accommodated in the drain tank is larger than the amount of drain required to generate steam. It may become. In such a case, the drain is stored in the drain tank for a long time, and the heat of the drain cannot be used sufficiently effectively.

  Accordingly, an object of the present invention is to provide a closed type boiler system that can further improve thermal efficiency.

  The present invention includes a boiler that generates steam and supplies the generated steam to a load device, and the drain generated by the load device condensing by using the steam without opening it to the atmosphere. A closed-type boiler system comprising: a drain tank to be recovered; and a first drain supply line that connects the drain tank and the boiler and feeds the drain accommodated in the drain tank to the boiler. A first drain circulation line having a side connected to the first drain supply line and a tip side connected to the drain tank, and circulating a part of the drain flowing through the drain supply line to the drain tank; Air heater which performs heat exchange between the drain which comprises a part and distribute | circulates the said 1st drain circulation line, and the combustion air supplied to the said boiler Relates to a boiler system further comprises a.

  The boiler system also includes an exhaust gas boiler that generates heat by exchanging heat between exhaust gas generated in a power generation device that generates power by burning fuel and the drain, and a drain accommodated in the drain tank. It is preferable to further include a second drain supply line that supplies the exhaust gas boiler, and a steam line that supplies the steam generated in the exhaust gas boiler to the load equipment side.

  Further, the boiler system is open to the atmosphere and stores a replenishing water to be supplied to the boiler, and a base end side is connected to the drain tank and a tip end side is connected to the open tank, and is stored in the drain tank. And a flash steam line through which flash steam generated from the drain flows.

  The power generation device is disposed in the apparatus main body for generating power by burning fuel, a cooling water line for circulating cooling water for cooling the apparatus main body, and the cooling water line. A first heat exchanger that exchanges heat with the circulating cooling water and cools the cooling water, and is disposed upstream of the first heat exchanger in the cooling water line, and flows through the cooling water line A second heat exchanger that exchanges heat with the cooling water that heats the cooling water, and the boiler system connects the open tank and the second heat exchanger, and the open tank The replenishment which connected the cooling water heating line which supplies the make-up water stored in the said 2nd heat exchanger, the said 2nd heat exchanger, and the said open tank, and performed heat exchange with this 2nd heat exchanger Return line to return water to the open tank When, further preferably comprises a.

  The power generation device is disposed in the apparatus main body for generating power by burning fuel, a cooling water line for circulating cooling water for cooling the apparatus main body, and the cooling water line. A first heat exchanger that exchanges heat with the circulating cooling water and cools the cooling water, and is disposed upstream of the first heat exchanger in the cooling water line, and flows through the cooling water line A second heat exchanger that exchanges heat with the cooling water that heats the cooling water, and the boiler system connects the drain tank and the second heat exchanger, and the drain tank A cooling water heating line for supplying the drain contained in the second heat exchanger to the second heat exchanger, the second heat exchanger and the drain tank are connected, and the drain subjected to heat exchange with the second heat exchanger A return line for returning to the drain tank; It is preferably provided to.

  According to the boiler system of the present invention, the thermal efficiency can be further improved.

It is a figure showing composition of a boiler system concerning a 1st embodiment of the present invention. It is a figure which shows the structure of the boiler system which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the boiler system which concerns on 3rd Embodiment of this invention.

  Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings. The boiler system of the present invention, as shown in FIG. 1, is a closed type in which drain generated in the load device 20 is collected in a high-pressure and high-pressure state in a pressure-tight sealed tank and the drain is supplied to the boiler. Boiler system.

First, the boiler system 1 of 1st Embodiment is demonstrated.
The boiler system 1 of 1st Embodiment is provided with the boiler 10, the drain tank 30, and the open tank 40 as shown in FIG.

  In addition, the boiler system 1 connects these devices, a plurality of lines through which steam or water flows, a plurality of valves that open and close the plurality of lines, a plurality of pumps arranged in a predetermined line, and a plurality of these A control device (not shown) for controlling the operation of a valve, a plurality of pumps and the like is provided. Specifically, the boiler system 1 is supplied with a first steam supply line L1, a drain recovery line L2, a first drain supply line L3, a second steam supply line L4, a flash steam line L5 as lines. A water line L6, a first drain circulation line L7, and a second drain circulation line L8 are provided.

  The boiler 10 includes a can body 11 that generates steam, a blower 12 that sends combustion air to the can body 11, an air supply duct 13 that connects the blower 12 and the can body 11, and through which combustion air flows, An air heater 14 that is disposed in the air duct 13 and heats combustion air, a steam header 16 in which steam generated in the can 11 is collected, and a connecting pipe 17 that connects the can 11 and the steam header 16. And a gas-liquid separator 18 that is disposed in the connecting pipe 17 and separates moisture contained in the steam generated in the can 11.

  According to the boiler 10 described above, first, drain as water supply is supplied to the can 11. Further, the combustion air sent from the blower 12 is supplied to the can 11 through the air supply duct 13, and the fuel is supplied from the fuel supply line 15 so that the fuel is combusted. Here, the combustion air is heated by the air heater 14 and then supplied to the can 11. Details of the heat exchange by the air heater 14 will be described later.

The drain supplied to the can 11 is heated by the combustion of the fuel, and steam is generated from the drain. The moisture contained in the steam generated in the can 11 is removed by the gas-liquid separator 18, and the steam from which the moisture has been removed is collected in the steam header 16 via the connecting pipe 17.
The steam collected in the steam header 16 is supplied to a load device 20 which is a steam use facility.

The load device 20 uses the steam generated in the boiler 10 as a heat source, and performs heat exchange with the object to be heated.
The drain tank 30 collects and stores the drain produced by agglomeration of a part of the steam used for heat exchange in the load device 20. The drain tank 30 is constituted by a pressure vessel that has pressure resistance and can be sealed.

  The open tank 40 is open to the atmosphere. The open tank 40 stores makeup water supplied to the boiler 10. The open tank 40 is introduced with flash steam generated from the drain in the drain tank 30.

The first steam supply line L <b> 1 connects the steam header 16 and the load device 20 and supplies the steam generated by the boiler 10 to the load device 20.
The drain collection line L <b> 2 connects the load device 20 and the drain tank 30 and supplies the drain generated in the load device 20 to the drain tank 30. In the drain recovery line L2, a steam trap 21, a check valve 22, and a motor valve 23 that discharge drain generated in the load device 20 and prevent discharge of steam are arranged.

  The first drain supply line L3 connects the drain tank 30 and the boiler 10, and supplies the drain accommodated in the drain tank 30 to the boiler 10. In the first embodiment, the upstream end of the first drain supply line L <b> 3 is connected to the lower portion of the drain tank 30. Further, the downstream side of the first drain supply line L <b> 3 is connected to the lower portion of the can 11.

A drain pump 31 and a drain supply valve 32 are arranged in the first drain supply line L3.
The drain pump 31 boosts the drain supplied from the drain tank 30 and supplies it to the boiler 10. The drain supply valve 32 is configured by a motor valve.

  The second steam supply line L4 connects the steam header 16 and the drain tank 30. The second steam supply line L4 supplies steam generated in the boiler 10 to the drain tank 30 and adjusts the pressure inside the drain tank 30. A pressure regulating valve 41 and a motor valve 42 are disposed in the second steam supply line L4.

  The flash steam line L5 connects the drain tank 30 and the open tank 40, and discharges the flash steam generated in the drain tank 30 to the open tank 40. A pressure regulating valve 51 is disposed in the flash steam line L5. When the pressure inside the drain tank 30 exceeds a predetermined pressure, the pressure regulating valve 51 releases the flash vapor to the open tank 40 side and reduces the pressure inside the drain tank 30.

  The makeup water line L <b> 6 connects the open tank 40 and the drain tank 30, and supplies the water stored in the open tank 40 to the drain tank 30. A pump 61 is disposed in the makeup water line L6.

The first drain circulation line L7 connects the first drain supply line L3 and the drain tank 30. More specifically, the upstream (base end side) end of the first drain circulation line L7 is connected between the drain pump 31 and the drain supply valve 32 in the first drain supply line L3. An end portion on the downstream side (front end side) of the first drain circulation line L7 is connected to a lower portion (liquid phase portion) of the drain tank 30. The motor valve 81 and the above-described air heater 14 are disposed in the first drain circulation line L7.
The first drain circulation line L7 circulates a part of the drain flowing through the first drain supply line L3 to the drain tank 30. The air heater 14 performs heat exchange between the drain that flows through the first drain circulation line L7 and the combustion air that flows through the air supply duct 13 to heat the combustion air.

  The second drain circulation line L8 connects the first drain supply line L3 and the drain tank 30. More specifically, the upstream end of the second drain circulation line L8 is downstream of the drain pump 31 in the first drain supply line L3 and upstream of the connection portion with the first drain circulation line L7. Connected to the side. The downstream end of the second drain circulation line L8 is branched into a line connected to the upper part of the drain tank 30 and a line connected to the lower part of the drain tank 30. A motor valve 81 is disposed on the line connected to the upper portion of the drain tank 30, and an orifice 82 is disposed on the line connected to the lower portion of the drain tank 30.

  The second drain circulation line L8 returns a part or all of the drain flowing through the first drain supply line L3 to the drain tank 30. More specifically, from the line connected to the lower part of the drain tank 30, the drain is circulated to the liquid phase part of the drain tank 30, and from the line connected to the upper part of the drain tank 30, the gas phase of the drain tank 30 is Drain is circulated in the part. In the second drain circulation line L8, the flow rate of the drain circulated to the liquid phase part is adjusted by the orifice 82 to make the temperature of the drain stored in the drain tank 30 uniform, and the drain circulated to the gas phase part. Thus, the flash vapor generated in the drain tank 30 is recovered.

Next, operation | movement of the boiler system 1 of 1st Embodiment is demonstrated.
In the first embodiment, first, steam is generated in the boiler 10. Specifically, first, combustion air is supplied from the air supply duct 13, mixed with fuel supplied from the fuel supply line 15, and burned inside the can 11. Next, steam is generated from the feed water (drain) supplied to the can body 11 by the combustion gas generated by the combustion of the fuel. The steam generated in the can 11 is supplied to the steam header 16 through the connecting pipe 17 after moisture is separated in the gas-liquid separator 18.
The steam supplied to the steam header 16 becomes drain after being used in the load device 20 and is stored in the drain tank 30 in a high temperature and high pressure state. And the drain stored by the drain tank 30 is supplied to the boiler 10 as feed water through the 1st drain supply line L3.

  Further, a part of the drain flowing through the first drain supply line L3 is returned to the drain tank 30 through the first drain circulation line L7 and the second drain circulation line L8. Here, in 1st Embodiment, the air heater 14 which performs heat exchange between the combustion air which distribute | circulates the air supply duct 13 is arrange | positioned in the 1st drain circulation line L7. Thereby, combustion air can be heated with the drain which distribute | circulates the 1st drain circulation line L7.

  According to the boiler system 1 of 1st Embodiment demonstrated above, there exist the following effects.

(1) When a closed type boiler system is configured using a boiler with a relatively small capacity, the amount of drain accommodated in the drain tank is smaller than the amount of drain required to generate steam. It may increase. In such a case, the drain is stored in the drain tank for a long time, and the heat of the drain cannot be used sufficiently effectively.
Therefore, in the boiler system 1, a first drain circulation line L7 that circulates a part of the drain supplied from the drain tank 30 to the boiler 10 to the drain tank 30, and a drain and the boiler 10 that circulate in the first drain circulation line L7. And an air heater 14 for exchanging heat with the combustion air supplied to the air. Thereby, since the heat of the drain accommodated in the drain tank 30 can be used for heating of the combustion air, the heat of the drain can be used more effectively. Further, since the drain that has exchanged heat with the combustion air is circulated through the drain tank 30 without being directly supplied to the boiler 10, a decrease in the temperature of the drain supplied to the boiler 10 can be reduced. Therefore, the thermal efficiency of the boiler system 1 can be further improved.

  (2) The boiler system 1 is configured to include an open tank 40 that stores makeup water, and a flash steam line L5 that leads the flash steam generated in the drain tank 30 to the open tank 40. Thereby, flash vapor | steam is collect | recovered with the open tank 40 and can be utilized as makeup water. Therefore, since the amount of drain discharged to the outside can be reduced in the boiler system 1, the boiler system 1 can be operated more efficiently. Moreover, since the temperature of the makeup water stored in the open tank 40 can be maintained at a high temperature, the thermal efficiency of the boiler system 1 can be further improved.

Next, the configuration of a boiler system 1A according to the second embodiment of the present invention will be described with reference to FIG. In the description after the second embodiment, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
The boiler system 1A of the second embodiment includes an exhaust gas boiler that generates steam by using exhaust gas generated in a power generation device that generates power by burning fuel, such as a diesel engine or a gas turbine, as a heat source. This is different from the first embodiment.
The boiler system 1 </ b> A of the second embodiment is suitably used as a marine boiler system having a main engine and an auxiliary boiler as power.

  First, the main engine 100 as a power generation device will be described. The main engine 100 is configured by, for example, a diesel engine that uses light oil as fuel. As shown in FIG. 2, the main engine 100 includes an apparatus main body 110, an exhaust duct 120, a cooling water line 130, a water generator 140 as a first heat exchanger, a second heat exchanger 150, A drain cooler 160.

The device main body 110 generates power by burning fuel.
The exhaust duct 120 discharges exhaust gas generated by the combustion of fuel in the apparatus main body 110.
The cooling water line 130 passes through the inside of the apparatus main body 110 and has an annular shape. Cooling water circulates inside the cooling water line 130, thereby cooling the apparatus main body 110.

  The water generator 140 is disposed in the cooling water line 130. For example, the water generator 140 produces fresh water by heating and distilling seawater in a vacuum environment. That is, the water generator 140 performs heat exchange between the high-temperature cooling water heated by absorbing the heat of the apparatus main body 110 and seawater to produce fresh water.

  The second heat exchanger 150 is disposed on the upstream side of the water generator 140 in the cooling water line 130. High-temperature water (for example, about 90 ° C.) is supplied to the second heat exchanger 150 from a cooling water heating line 93 described later. And heat exchange is performed between the cooling water (for example, 80 degreeC) which distribute | circulates the cooling water line 130, and this cooling water is heated.

  The drain cooler 160 is disposed downstream of the water generator 140 in the cooling water line 130. The drain cooler 160 further cools the cooling water cooled in the water generator 140 with seawater.

  The boiler system 1A of the second embodiment includes an exhaust gas boiler 90, a second drain supply line 91, a steam line 92, a cooling water heating line 93, and a return in addition to the configuration of the boiler system 1 of the first embodiment. A line 94.

  The exhaust gas boiler 90 generates heat by exchanging heat between the exhaust gas generated in the main engine 100 and the drain supplied from the drain tank 30. An exhaust duct 120 of the main engine 100 is connected to the exhaust gas boiler 90, and exhaust gas is supplied through the exhaust duct 120.

  The second drain supply line 91 supplies the drain accommodated in the drain tank 30 to the exhaust gas boiler 90. In the second embodiment, the upstream side of the second drain supply line 91 is connected to the boiler 10 (lower part of the can body 11), and the downstream side is connected to the lower part of the exhaust gas boiler 90. That is, in the second embodiment, the drain accommodated in the drain tank 30 is supplied to the exhaust gas boiler 90 via the first drain supply line L3, the can body 11, and the second drain supply line 91. A pump 911 is disposed in the second drain supply line 91.

  The steam line 92 supplies the steam generated in the exhaust gas boiler 90 to the load device 20 side. In 2nd Embodiment, the upstream of the steam line 92 is connected to the upper part of the exhaust gas boiler 90, and the downstream is connected to the boiler 10 (upper part of the can 11). That is, in the second embodiment, the steam generated in the exhaust gas boiler 90 is supplied to the load device 20 via the steam line 92 and the boiler 10.

The cooling water heating line 93 connects the open tank 40 and the second heat exchanger 150, and supplies makeup water stored in the open tank 40 to the second heat exchanger 150. A pump 931 is disposed on the cooling water heating line 93.
The return line 94 connects the second heat exchanger 150 and the open tank 40, and returns the makeup water that has been heat-exchanged by the second heat exchanger 150 to the open tank 40.

Next, in the operation of the boiler system 1A of the second embodiment, a part different from the first embodiment will be described.
In the second embodiment, in the main engine 100, fuel is burned to generate exhaust gas. The exhaust gas is introduced into the exhaust gas boiler 90 via the exhaust duct 120.

The exhaust gas boiler 90 is supplied with the drain accommodated in the drain tank 30 via the first drain supply line L3, the can 11 and the second drain supply line 91. The drain supplied to the exhaust gas boiler 90 is heated by the exhaust gas to generate steam.
The steam generated in the exhaust gas boiler 90 is supplied to the load device 20 via the steam line 92 and the boiler 10.

  On the other hand, in the main engine 100, the cooling water circulating in the cooling water line 130 cools the apparatus main body 110 inside the apparatus main body 110 and is heated to, for example, about 80 ° C.

  Next, the cooling water (about 80 ° C.) exiting the apparatus main body 110 is introduced into the second heat exchanger 150. The second heat exchanger 150 is supplied with makeup water stored in the open tank 40 via the cooling water heating line 93. Here, since the flash steam is collected in the open tank 40, high-temperature makeup water (for example, about 90 ° C.) is stored in the open tank 40. Thereby, in the 2nd heat exchanger 150, the cooling water which distribute | circulates the cooling water line 130 is further heated by higher temperature supplementary water.

  Next, the cooling water exiting the second heat exchanger 150 is introduced into the fresh water generator 140. In the water generator 140, seawater is heated and distilled by high-temperature cooling water to produce fresh water. Then, the cooling water is cooled.

Next, the cooling water exiting the water generator 140 is introduced into the drain cooler 160. In the drain cooler 160, the cooling water is further cooled by seawater (for example, about 70 ° C.).
Then, the cooling water cooled out of the drain cooler 160 is again introduced into the apparatus main body 110.

  According to the boiler system 1A of the second embodiment described above, the following effects are obtained in addition to the effects (1) and (2).

  (3) The boiler system 1A includes the exhaust gas boiler 90 and a second drain supply line 91 that supplies drain to the exhaust gas boiler 90. Thereby, since the drain accommodated in the drain tank 30 can also be supplied to the exhaust gas boiler 90 to generate steam, the heat utilization efficiency in the boiler system 1A can be further improved.

  (4) The main engine 100 includes a device main body 110, a cooling water line 130 for cooling the device main body 110, a water generator 140 disposed in the cooling water line 130, and a water generator 140 in the cooling water line 130. And the second heat exchanger 150 arranged on the upstream side. The boiler system 1A includes a cooling water heating line 93 that supplies makeup water to the second heat exchanger 150, and a return line 94 that returns the makeup water exchanged by the second heat exchanger 150 to the open tank 40. , Including. Thereby, since the cooling water heated by the apparatus main body 110 can be introduced into the fresh water generator 140 after being heated by the hotter supplemental water stored in the open tank 40, the production efficiency of fresh water by the fresh water generator 140 is improved. Be made. Further, the heat energy of the makeup water stored in the open tank 40 can be used effectively.

Next, the configuration of a boiler system 1B according to a third embodiment of the present invention will be described with reference to FIG.
The boiler system 1B of the third embodiment is different from the second embodiment in the configuration of the cooling water heating line 93B and the return line 94B.

  In the third embodiment, as shown in FIG. 3, the cooling water heating line 93 </ b> B connects the drain tank 30 and the second heat exchanger 150, and the drain accommodated in the drain tank 30 is transferred to the second heat exchanger 150. To supply. More specifically, the upstream end of the cooling water heating line 93B is connected to the vicinity of the branch portion of the first drain supply line L3 with the first drain circulation line L7. A motor valve 95B is disposed in the cooling water heating line 93B.

The return line 94 </ b> B connects the second heat exchanger 150 and the drain tank 30, and returns the drain that has undergone heat exchange in the second heat exchanger 150 to the drain tank 30. More specifically, the downstream end of the return line 94B is connected to the lower portion (liquid phase portion) of the drain tank 30.
Thus, in 3rd Embodiment, the drain accommodated in the drain tank 30 is used as a heat source in the 2nd heat exchanger 150. FIG.

  According to the boiler system 1B of the third embodiment described above, in addition to the effects (1) to (3) described above, the following effects can be obtained.

  (5) the boiler system 1B, a cooling water heating line 93B for supplying drain to the second heat exchanger 150, a return line 94B for returning the drain heat-exchanged in the second heat exchanger 150 to the drain tank 30, Constructed including. Thereby, since the cooling water heated by the apparatus main body 110 can be introduce | transduced into the water generator 140 after heating with the drain accommodated in the drain tank 30, the production efficiency of the fresh water by the water generator 140 can be improved. Moreover, the thermal energy of the drain accommodated in the drain tank 30 can be used effectively.

As mentioned above, although each preferred embodiment of the boiler system of the present invention was described, the present invention is not limited to the embodiment mentioned above, and can be changed suitably.
For example, in the first to third embodiments, the boiler systems 1, 1 </ b> A, and 1 </ b> B are configured by one boiler 10, but are not limited thereto. That is, the boiler system may be configured to include a plurality of boilers.

  In the first to third embodiments, the makeup water line L6 is configured by connecting the open tank 40 and the drain tank 30, but the present invention is not limited to this. That is, the makeup water line includes a first makeup water line that connects the open tank and the drain tank, and a second makeup water line that connects the open tank and the first drain supply line. Also good.

1, 1A, 1B Boiler System 10 Boiler 11 Can 14 Air Heater 20 Load Equipment 30 Drain Tank 40 Open Tank 90 Exhaust Gas Boiler 91 Second Drain Supply Line 92 Steam Line 93, 93B Cooling Water Heating Line 94, 94B Return Line 100 Main engine (power generator)
110 apparatus main body 130 cooling water line 140 fresh water generator (first heat exchanger)
150 2nd heat exchanger L3 1st drain supply line L5 Flash steam line L7 1st drain circulation line

Claims (5)

A boiler having a can that generates steam and supplying the generated steam to a load device;
A drain tank that collects the drain generated by condensation of the load device using steam without opening it to the atmosphere;
A closed-type boiler system comprising: a first drain supply line that connects the drain tank and the boiler and feeds the drain contained in the drain tank to the boiler;
A first drain circulation line that has a proximal end connected to the first drain supply line and a distal end connected to the drain tank, and circulates a part of the drain circulating through the first drain supply line to the drain tank;
A boiler system further comprising: an air heater that configures a part of the boiler and performs heat exchange between a drain that flows through the first drain circulation line and combustion air that is supplied to the boiler. An exhaust gas boiler that generates steam by exchanging heat between exhaust gas generated in a power generation device that generates power by burning fuel and the drain;
A second drain supply line for supplying drain contained in the drain tank to the exhaust gas boiler;
The boiler system according to claim 1, further comprising: a steam line that supplies steam generated in the exhaust gas boiler to the load equipment side. An open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler;
The apparatus further comprises a flash steam line having a proximal end side connected to the drain tank and a distal end side connected to the open tank, through which flash steam generated from the drain accommodated in the drain tank flows. The described boiler system. The power generator is
An apparatus main body for generating power by burning fuel;
A cooling water line through which cooling water for cooling the apparatus body circulates;
A first heat exchanger that is disposed in the cooling water line and exchanges heat with the cooling water flowing through the cooling water line to cool the cooling water;
A second heat exchanger that is disposed upstream of the first heat exchanger in the cooling water line and heats the cooling water by exchanging heat with the cooling water flowing through the cooling water line; Prepared,
The boiler system is
A cooling water heating line that connects the open tank and the second heat exchanger and supplies makeup water stored in the open tank to the second heat exchanger;
The boiler according to claim 3, further comprising: a return line that connects the second heat exchanger and the open tank and returns the makeup water that has been heat-exchanged by the second heat exchanger to the open tank. system. The power generator is
An apparatus main body for generating power by burning fuel;
A cooling water line through which cooling water for cooling the apparatus body circulates;
A first heat exchanger that is disposed in the cooling water line and exchanges heat with the cooling water flowing through the cooling water line to cool the cooling water;
A second heat exchanger that is disposed upstream of the first heat exchanger in the cooling water line and heats the cooling water by exchanging heat with the cooling water flowing through the cooling water line; Prepared,
The boiler system is
A cooling water heating line that connects the drain tank and the second heat exchanger, and supplies the drain accommodated in the drain tank to the second heat exchanger;
The return line which connects the 2nd heat exchanger and the drain tank, and returns the drain which carried out heat exchange with the 2nd heat exchanger to the drain tank, It is according to claim 2 or 3 Boiler system.

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