JPS59126006A - Marine heating system of ship necessitating tank heating - Google Patents

Abstract

PURPOSE:To enhance the thermal efficiency and contrive to save energy by a method wherein at least a part of the exhaust steam discharged from a turbine is utilized for tank heating in a system, in which turbines to produce propulsive force and a turbine to produce power for various works are driven by the steam sent from a boiler. CONSTITUTION:The steam generated at a main boiler 21 is sent and supplied through a superheater 22 to a back pressure type main turbine 23 and an auxiliary turbine 24 and yet a part of the steam extracted from the main turbine 23 is sent to a feed water heater 26. In addition, the major part of the exhaust steam discharged from the main turbine 23 is supplied through a back pressure regulating valve 27 to a tank heater 28 and another inboard heating source 29, while the excess part of said exhaust steam is supplied through a damper valve 30 to a low pressure turbine 31 for propulsion and heating. After that, the steams supplied to said heater 28 and heating source 29 are condensed and liquefied in the respective apparatuses and sent together with the condensate flowed from a condenser 32 to a drain tank 33 and flowed through the feed water heaters 34 and 26 back to the main boiler 21. Similarly, a part of the exhaust steam discharged from the auxiliary turbine 24 is utilized to heat the heater 28 and the heating source 29.

Description

[Detailed description of the invention] The present invention relates to a ship that requires tank heating.

In particular, it relates to a heating system that uses exhaust gas from a turbine to heat a tank.

Conventionally, tank heating methods for ships 1 that require tank heating, such as tankers for transporting high-viscosity cargo, can be roughly divided into the following two types depending on the type of propulsion engine. That is,
There are two types of propulsion: one using a diesel as the main machine, and the other using a steam turbine as the main machine. In the case of a propulsion type using a diesel as the main machine, as shown in Figure 1, a diesel engine with a propeller 1 connected for propulsion is used. Although the main machine 2 is used, the steam generated by waste heat recovery from exhaust gas cannot cover the amount of steam for heating the tank, so when heating the tank 3, the auxiliary boiler 4 is operated separately. The heated steam generated is supplied to the heating tube 5 that heats the tank 3. Therefore, the auxiliary boiler 4
In addition, the auxiliary boiler is generally less thermally efficient than the main boiler, which poses a problem in energy consumption.

On the other hand, in the case of a propulsion type using a steam turbine as the main machine, as shown in FIG. It is used as commercial steam. However, since the main boiler generally generates high-pressure and high-temperature steam, in order to lower the steam conditions to a pressure and temperature suitable for tank heating, a low pressure is placed between the main boiler 11 and the heating pipe 15 that heats the tank 14. It is necessary to provide a heating device 17 such as a steam generator, which results in heat loss and increased costs. In addition, the main turbine for propulsion is of a condensing type and requires a condenser 16 for condensing exhaust steam, and as a result of discarding a large amount of condensation heat into seawater, there is a problem that fuel efficiency is lower than that of a diesel main engine.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating system for a ship that requires tank heating, which can save both energy consumption and cost.

Therefore, in the present invention, in a ship that supplies steam from a boiler to a turbine and requires tank heating to obtain propulsive force or various working power by driving the turbine, at least a portion of the exhaust gas from the turbine is The above objective is achieved by supplying the heating tube to the heating tube for heating the tank. In short, by using the exhaust gas from the turbine to heat the tank and returning the cooled and condensed condensate in the tank to the boiler, the condensation heat that was previously wasted in the seawater can be used, while at the same time selecting back pressure. This aims to omit the conventional heating device and save both energy consumption and cost.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the system of this embodiment. In the figure, steam generated in a main boiler 21 is superheated in a superheater 22 and then sent to a back pressure type king turbine 23 and an auxiliary turbine 24, respectively. The steam sent to the main turbine 23 is transferred to the main turbine 23 and the propeller 25 connected thereto.
Turn to generate propulsion. Here, the main turbine 23
A portion of the driving steam is extracted and sent to the feedwater heater 26 to form a regeneration cycle. Further, the exhaust gas from the turbine 23 is adjusted to an appropriate pressure and supplied to the tank heating pipe 28 and other inboard heating sources 29 by a back pressure regulating valve 27. Here, in the summer, if heating of the ballast voyage special tank is not required or is small, the main turbine 2
The back pressure of the turbine 3 increases, leading to a decrease in turbine efficiency (therefore, reserve steam is supplied to the propulsion assisting low-pressure turbine 31 through the tank 9F30).

The propulsive assisting low pressure turbine 31 is similar to the main turbine 2.
3 through a shaft or gears. Therefore, surplus steam from the main turbine 23 is used as propulsive force, just like a low-pressure turbine in a normal turbine plant. Therefore, the heat of condensation is discarded into the seawater, but because the inlet pressure is low (the exhaust pressure cannot be used for anything else, to increase turbine efficiency, and because it is not constantly used, etc.) It doesn't go against the purpose of Kouken Ruze.

On the other hand, the tank heating pipe 28 and other inboard heating sources 29
The steam supplied to the . 0 is also returned to the main boiler 21.

The exhaust gas from the auxiliary turbine 24 is sent to the feed water heater 3.
In addition to heating the tank heating pipe 2B or other inboard heating source 29,

Therefore, according to this embodiment, the exhaust gas from the main turbine 23 is supplied to the tank heating pipe 28 and other inboard heating sources 29 via the back pressure regulating valve 27, so that the exhaust gas from the main turbine 23 is unnecessarily discarded into the seawater. It is possible to utilize the amount of condensation heat previously stored, and by appropriately selecting the back pressure of back pressure adjustment-5f127, the conventional heating device can be omitted, resulting in savings in both energy consumption and cost.

By the way, in a conventional system using a steam turbine as the main machine, the inlet enthalpy of the main turbine is 820 H/kg.
The exhaust enthalpy is about 7 to 550 VrA/, and the condensate enthalpy is about 9 to 3 (l TkA/), so of the steam energy generated in the boiler, the cut-off A difference is 82
0 550 = 270 + al/kgL cannot be used as propulsive force, and 550 30 = 520 viscosity/ky is wasted in the seawater. On the other hand, in this example, if the exhaust gas enthalpy is 650 u/, which is about 9, the expansion is stopped and the tank is heated, and the heat drop at the main turbine is 8.
20-650=17011cj/kg, and the 1-population vapor volume increases. Here, let's assume that the tank heating tube is 150 yen/
If you use heat to reach kg of drain, 650 150 = 500
9 u/kg can be used, and if it is directly returned to the boiler as condensate, no heat will be lost to seawater, and a total of 670 u/kg of heat can be used, which is about 2.5 times more heat than conventional methods. This can significantly reduce the amount of sea water used to cool the condenser 32, which in turn can significantly reduce power consumption, as well as reduce the size of the condenser 32 and eliminate the need for a heating device. On the other hand, if the amount of exhaust from the main turbine 23 to the tank heating pipe 28 is insufficient, the exhaust from the auxiliary turbine 24 can also be used. On the other hand, when there is excess exhaust from the main turbine 23, the excess steam is used in the propulsive assisting low pressure turbine 31, so more efficient operation can be achieved.

In addition, in addition to the above-mentioned embodiment, as for the treatment of surplus exhaust gas when the tank is heated in the middle of the year, a structure as shown in FIG. 4 can also be used. In addition to inserting a pressure reducing valve 36 into the tank, the steam inlet of the auxiliary turbine 24 is connected to the downstream side of the Dan 7" square 30, and the piping connecting the exhaust gas of the auxiliary turbine 24 to the tank heating pipe 28 is omitted. By doing so, surplus steam from the main turbine 23 can be processed by the auxiliary turbine 24, which uses various types of power, such as a turbo generator and a cargo oil tanker, in addition to the low-pressure turbine 31 for propulsion and assistance.

As described above, according to the present invention, it is possible to provide a heating system for a ship that requires tank heating, which can save both energy consumption and cost.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a conventional heating system, FIG. 3 is a diagram showing an embodiment of the present invention, and FIG. 4 is a diagram showing a modification thereof. 21... Main boiler, 23... Main turbine, 24...
- Auxiliary equipment turbine, 27... Back pressure regulating valve, 28... Tank heating pipe, 31... Low pressure turbine for propulsion assistance. Agent Patent attorney Minoru Kinoshita (and 1 other person) Figure 1 Figure 2

Claims (1)

[Scope of Claims] (1) In a ship that supplies steam from a boiler to a turbine and requires tank heating to obtain propulsive force or power for various types of work by driving the turbine, at least one of the exhaust gas from the turbine is heated. 1. A heating system for a ship requiring tank heating, characterized in that a portion of the water is supplied to a heating pipe for heating said tank. (21% Permissible Claim 1) A heating system for a ship that requires tank heating, characterized in that the turbine is a back-pressure steam turbine for obtaining propulsive force. (8) Claims A heating system for a ship that requires tank heating, characterized in that a back pressure adjustment box is provided between the exhaust side of the turbine and the introduction side of the heating pipe in the first or second range. 4) Permissible % Claims In any one of claims 1 to 3, the exhaust gas from the turbine is selectively supplied to a low-pressure turbine for propulsive support or an auxiliary turbine for obtaining power for work. Vessel heating systems that require tank heating.