JP6193730B2 - Boiler system - Google Patents

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

Further, as a boiler system used in a ship or the like, the boiler system is configured to include an exhaust gas boiler that generates steam using exhaust gas generated in a main engine that is power of the ship or the like in addition to the main boiler. Has been proposed.
By the way, in the closed boiler system, flash steam is generated inside the drain tank due to a decrease in the pressure of the drain. The flash vapor generated inside the drain tank is discharged to the outside. Here, the flash steam is introduced into an open tank opened to the atmosphere for storing makeup water to be supplied to the boiler, and heat stored in the flash steam is recovered. However, when the flash steam generated in the drain tank is introduced into the open tank, the temperature of the makeup water stored in the open tank exceeds 100 ° C, and the heat held by the flash steam may not be sufficiently recovered. . In particular, a boiler system used in a ship that is difficult to supply fresh water is required to be used in a closed system without releasing flash steam to the outside as much as possible.

  Therefore, an object of the present invention is to provide a boiler system that can further improve the heat utilization efficiency and suppress the discharge of flash steam to the outside.

  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. In a drain tank to be recovered, 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, and a power generator that generates power by burning fuel An exhaust gas boiler that generates heat by exchanging heat between the generated exhaust gas and the drain, a second drain supply line that supplies the drain accommodated in the drain tank to the exhaust gas boiler, and is generated in the exhaust gas boiler And a steam line for supplying the steam to the load device side, a closed type boiler system, An apparatus main body that generates power by burning fuel, a cooling water line that circulates cooling water that cools the apparatus main body, and a cooling water that is disposed in the cooling water line and flows through the cooling water line. Heat is exchanged between the first heat exchanger that performs heat exchange and cools the cooling water, and the cooling water that 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 and heats the cooling water, wherein the boiler system connects the drain tank and the second heat exchanger, and the flash steam generated in the drain tank is connected to the second heat exchanger. The present invention relates to a boiler system further comprising a flash steam supply line for supplying heat to two heat exchangers.

  The boiler system is connected to an open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler, the second heat exchanger, and the open tank, and performs heat exchange with the second heat exchanger. A return line for returning the drain generated by condensation of the flushed steam to the open tank, a drain storage tank disposed in the return line, and a steam trap disposed downstream of the drain storage tank in the return line It is preferable to further comprise.

  The boiler system is connected to an open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler, the second heat exchanger, and the open tank, and performs heat exchange with the second heat exchanger. A return line for returning the drain generated by condensing the flash vapor to the open tank, a drain storage tank arranged in the return line, and a return pump arranged downstream of the drain storage tank in the return line It is preferable to further comprise.

  According to the boiler system of the present invention, the heat utilization efficiency can be further improved, and the release of flash steam to the outside can be suppressed.

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.

Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings. As shown in FIG. 1, the boiler system 1 of 1st Embodiment collect | recovers the drain which generate | occur | produced in the load apparatus 20 in the sealed tank which has pressure resistance in the state of high temperature and pressure, and supplies this drain to a boiler. It is a closed type boiler system.
Moreover, the boiler system 1 of 1st Embodiment contains the exhaust gas boiler 90 which produces | generates a vapor | steam by making into a heat source the exhaust gas generated in the motive power generator 100 which burns fuel and generate | occur | produces motive power, such as a diesel engine and a gas turbine. Composed. Such a boiler system 1 is suitably used as a marine boiler system having a main engine and an auxiliary boiler as power.

First, the boiler system 1 of 1st Embodiment is demonstrated.
As shown in FIG. 1, the boiler system 1 according to the first embodiment includes a boiler 10, an exhaust gas boiler 90 as an auxiliary boiler, a drain tank 30, and an open tank 40.

  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 operations of a valve, a plurality of pumps and the like is provided. Specifically, the boiler system 1 includes, as lines, a first steam supply line L1, a drain recovery line L2, a first drain supply line L3, a second steam supply line L4, a makeup water line L5, 1 drain circulation line L6, flush steam supply line L7, and return line L8 are provided.

  The boiler 10 includes a can body 11 that generates steam, a steam header 12 that collects steam generated by the can body 11, a connecting pipe 13 that connects the can body 11 and the steam header 12, and a connecting pipe 13. And a gas-liquid separator 14 that separates moisture contained in the steam generated by the can 11.

  According to the boiler 10 described above, the drain supplied to the can 11 is heated by the combustion of 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 14, and the steam from which the moisture has been removed is collected in the steam header 12 via the connecting pipe 13.

  The exhaust gas boiler 90 generates heat by exchanging heat between exhaust gas generated in the main engine 100 described later and the drain supplied from the drain tank 30. In the first embodiment, the drain is introduced into the exhaust gas boiler 90 via the second drain supply line 91 that connects the boiler 10 and the exhaust gas boiler 90. Then, the steam generated in the exhaust gas boiler 90 is sent to the boiler 10 via the steam line 92. A motor valve 911 is disposed in the second drain supply line 91.

  The steam collected in the steam header 12 is supplied to a load device 20 which is a steam using 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.

  Next, 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. 1, 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 burning fuel in the apparatus main body 110. The downstream side of the exhaust duct 120 is connected to the exhaust gas boiler 90. Thereby, the exhaust gas is supplied to the exhaust gas boiler 90.
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. Flash steam is supplied to the second heat exchanger 150 from a flash steam supply line L7 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.

Next, details of the lines connecting the devices will be described.
The first steam supply line L <b> 1 connects the steam header 12 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 makeup water line L <b> 5 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 51 is disposed in the makeup water line L5.

  The first drain circulation line L6 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 L6 is connected between the drain pump 31 and the drain supply valve 32 in the first drain supply line L3. The downstream end of the first drain circulation line L <b> 6 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 61 is disposed on the line connected to the upper portion of the drain tank 30, and an orifice 62 is disposed on the line connected to the lower portion of the drain tank 30.

  The first drain circulation line L6 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 first drain circulation line L6, the flow rate of the drain circulated to the liquid phase part is adjusted by the orifice 62 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.

The flash steam supply line L7 connects the drain tank 30 and the second heat exchanger 150, and supplies the flash steam generated in the drain tank 30 to the second heat exchanger 150.
The return line L <b> 8 connects the second heat exchanger 150 and the open tank 40, and returns to the open tank 40 the drain generated by the condensation of the flash steam that has been heat-exchanged by the second heat exchanger 150. A drain storage tank 81 and a steam trap 82 are arranged in the return line L8.

The drain storage tank 81 stores the drain generated from the flash steam in the second heat exchanger 150.
The steam trap 82 is disposed on the downstream side of the drain storage tank 81. The steam trap 82 distributes only the drain of the drain and the flash steam flowing through the return line L8 to the downstream side, and prevents the flash steam from flowing to the downstream side.

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 (can 11). The steam generated in the can 11 is supplied to the steam header 12 through the connecting pipe 13 after moisture is separated in the gas-liquid separator 14.

The steam supplied to the steam header 12 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.
In addition, 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 L6.

On the other hand, 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 steam header 12 via the steam line 92 and the boiler 10.

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

  Next, the cooling water (about 80 ° C.) exiting the apparatus main body 110 is introduced into the second heat exchanger 150. Here, the flash steam generated in the drain tank 30 is supplied to the second heat exchanger 150 via the flash steam supply line L7. Thereby, in the 2nd heat exchanger 150, the cooling water which distribute | circulates the cooling water line 130 is further heated with flash steam.

  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.

  Further, the drain generated by the condensation of the flash steam that has exchanged heat with the cooling water in the second heat exchanger 150 is returned to the open tank 40 through the return line L8. More specifically, the drain generated by the condensation of the flash vapor is first stored in the drain storage tank 81. Next, the drain stored in the drain storage tank 81 flows to the open tank 40 side through the steam trap 82 and is accommodated in the open tank 40. Here, in the first embodiment, the steam trap 82 is disposed on the downstream side of the drain storage tank 81. Thereby, the drain can be returned to the open tank 40 using the pressure difference generated between the upstream side and the downstream side of the steam trap 82. Therefore, the drain can be returned to the open tank 40 without separately using energy.

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

  (1) The second heat exchange in which the boiler system 1 uses the exhaust gas generated in the main engine 100 to generate steam and the flash steam generated in the drain tank 30 heats the cooling water of the main engine 100. And a flash steam supply line L7 to be supplied to the vessel 150. Thereby, since the heat which flash vapor | steam has can be used for the heating of the cooling water of the main engine 100, the utilization efficiency of the heat of the boiler system 1 can be improved. In addition, by introducing the flash steam into the second heat exchanger 150, the temperature of the flash steam can be reduced and drainage can be performed, so that release of the flash steam to the outside can be suppressed.

  (2) The boiler system 1 is disposed in the open tank 40, a return line L8 for returning the drain generated from the flash steam that has been heat-exchanged by the second heat exchanger 150, and the return line L8. A drain storage tank 81 and a steam trap 82 disposed on the downstream side of the drain storage tank 81 are included. Thereby, the drain can be returned to the open tank 40 using the pressure difference generated between the upstream side and the downstream side of the steam trap 82. Therefore, the drain can be returned to the open tank 40 without separately using energy.

Next, a boiler system 1A according to a second embodiment of the present invention will be described with reference to FIG. In the description of the second embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted or simplified.
The boiler system 1A of the second embodiment is different from the first embodiment in that a return pump 83 is arranged in the return line L8 instead of the steam trap 82. That is, in the second embodiment, the drain that flows through the return line L <b> 8 (drain that is stored in the drain storage tank 81) is returned to the open tank 40 by the return pump 83.

  According to the boiler system 1A of the second embodiment, in addition to the above-described effect (1), the following effect can be obtained.

  (3) The boiler system 1A is disposed in the open tank 40, a return line L8 for returning the drain generated from the flash steam that has been heat-exchanged by the second heat exchanger 150, and the return line L8. A drain storage tank 81 and a return pump 83 disposed on the downstream side of the drain storage tank 81 are configured. Thereby, even when the pressure of the drain stored in the drain storage tank 81 is low (for example, when the temperature of the drain is 100 ° C. or lower), the drain can be suitably returned to the open tank 40.

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 1st Embodiment and 2nd Embodiment, although the boiler systems 1 and 1A were comprised by the one boiler 10, it does not restrict to this. That is, the boiler system may be configured to include a plurality of boilers.

  In the first embodiment and the second embodiment, the makeup water line L5 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.

DESCRIPTION OF SYMBOLS 1,1A Boiler system 10 Boiler 11 Can body 20 Load apparatus 30 Drain tank 40 Open tank 81 Drain storage tank 82 Steam trap 83 Return pump 90 Exhaust gas boiler 91 2nd drain supply line 92 Steam line 100 Main engine (power generation device)
110 apparatus main body 130 cooling water line 140 fresh water generator (first heat exchanger)
150 Second heat exchanger L3 First drain supply line L7 Flash steam supply line L8 Return line

Claims (3)

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 first drain supply line for connecting the drain tank and the boiler and supplying the boiler with the drain stored in the drain tank;
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;
A steam line for supplying steam generated in the exhaust gas boiler to the load equipment side;
A closed type boiler system comprising:
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 boiler system further comprising a flash steam supply line that connects the drain tank and the second heat exchanger and supplies the flash steam generated in the drain tank to the second heat exchanger. An open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler;
A return line for connecting the second heat exchanger and the open tank, and returning the drain generated by condensing the flash steam that has undergone heat exchange in the second heat exchanger to the open tank;
A drain storage tank disposed in the return line;
The boiler system according to claim 1, further comprising: a steam trap disposed on a downstream side of the drain storage tank in the return line. An open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler;
A return line for connecting the second heat exchanger and the open tank, and returning the drain generated by condensing the flash steam that has undergone heat exchange in the second heat exchanger to the open tank;
A drain storage tank disposed in the return line;
The boiler system according to claim 1, further comprising a return pump disposed on the downstream side of the drain storage tank in the return line.

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