JPS5949401A - Three-stage pressure type exhaust gas economizer system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-stage pressure exhaust gas economizer system.

Conventionally, large diesel aircraft such as ships W! The odor °C is a one-stage pressure exhaust gas economizer system (heat recovery system A) that recovers exhaust gas energy, creates UW air, and uses the steam to drive a generator to generate electricity.
However, with the recent trend toward energy conservation, there is a demand for exhaust gas heat recovery systems such as the one described above for medium-sized and small-sized diesel engines. However, in recent years, the fuel efficiency of diesel engines has improved and the exhaust gas temperature has become lower.
Therefore, when adopting a single-stage exhaust gas economizer system as described above in a good medium and small diesel engine (low gas temperature and small gas amount), sufficient heat recovery is required. The problem was that it couldn't be done.

Therefore, an object of the present invention is to provide a three-stage pressure exhaust gas economizer system that can solve the above problems.

That is, the present invention provides C in the exhaust gas discharge pipe from the bottom to the top.
A superheating tube, a high-pressure side evaporator tube, a medium-pressure side evaporator tube, and a low-pressure side 1 evaporator tube are arranged in sequence, and the high-pressure side evaporator tube and high-pressure side brackish water separator are connected to the first hot water tube and the first steam tube, and the Connect the medium pressure side evaporation pipe and the medium pressure side steam water separator with a second hot water pipe and a second steam pipe, and connect the low pressure side evaporation pipe and the low pressure side steam water preparator with an eighth hot water pipe and a third steam pipe, respectively. A first water supply pipe is provided to supply water to the low-pressure side brackish water separator, and the @
A primary heat exchanger that heats the first water supply pipe is installed in the middle of the second hot water pipe, and a part of the hot water in the first water supply pipe heated by the primary heat exchanger is supplied to the high-pressure side and intermediate-pressure side brackish water separators. At the same time, a second water supply pipe that supplies the hot water in the second water supply pipe is provided at a position 4q upstream from the primary heat exchanger of the second hot water pipe υ, and a secondary heat exchanger that further heats the hot water in the second water supply pipe, An 8-stage pressure exhaust gas economizer system characterized in that high-pressure steam in the high-pressure steam water separator is supplied to the CC steam turnon through the superheating pipe, and medium-pressure steam in the water separator is supplied for general use or to the steam turbine. be.

According to this configuration, the heat of the exhaust gas can be efficiently recovered over a wide range of temperatures ranging from high temperature to medium temperature to low temperature, and the hot water in the medium pressure side brackish water separator can be used to transfer the heat to each brackish water preparator. Heating the feed water (7°C) can increase the amount of evaporation in each brackish water separator, and also lowers the temperature at the inlet of the medium pressure side evaporator pipe (1) to widen the temperature difference between the medium pressure (i1111000 inlet and outlet) and maintain The efficiency of C heat recovery can be increased.

An embodiment of the present invention will be described below with reference to FIG. (
1) is an exhaust gas discharge pipe for discharging exhaust gas from the main engine (medium and small diesel engine) (2) of a ship, etc. from the chimney (3). A superheating pipe (4), a high-pressure side evaporator pipe (5), a medium-pressure side evaporator w (6), and a low-pressure side evaporator pipe (7) are arranged in this order, and the high-pressure side evaporator w (5) and the high-pressure side brackish water The corner (8) is connected via the hot water pipe 9) and the first steam pipe Ql, and is connected to the medium pressure side evaporation pipe (6) and the medium pressure side brackish water separator Q.
The low pressure side evaporator pipe (7) and the low pressure side brackish water separator 0 are connected to the third hot water pipe (IG and the eighth steam pipe). (C) is connected to C through the pipe 0. (One part is installed in the middle of the second hot water pipe 0; rL4.L-1 primary heat exchanger, This is a secondary heat exchanger installed upstream of the primary heat exchanger O'h.09 is the first water supply pipe that supplies water to the IF device O■ to the low-pressure side evaporation pipe; The primary heat exchanger α force is interposed in the above-mentioned high-pressure side and intermediate-pressure side brackish water separators (8) (II). This is the second water supply pipe that supplies hot water inside the water supply pipe, and there is a secondary heat exchanger (a rib interposed therebetween) in the middle of the water supply pipe.Therefore, the secondary heat exchanger
The part after leaving Enoki (the second water supply in the downstream area)
a) is branched into two pipes, -1000 (20A) is connected to the high pressure side brackish water separator (8), and 2000 (20B) is connected to the medium pressure side evaporator pipe 4.
They are connected to the iF device Oη, respectively. G(1) is the high-pressure side steam moisture angle 1 "high-pressure steam in the vessel (8)
I! (4) is a high IF: steam supply pipe that leads to the high pressure part of the C steam turbine (C). The low-pressure steam in HαO is guided through the low-pressure side evaporation pipe (C), and the medium-pressure steam in the medium-pressure side brackish water separator θυ is guided through the medium-pressure steam supply pipe (
The medium pressure air is supplied to the above-mentioned natural air turbine through C) for general use. ) is connected to a steam turbine and a t-cogenerator,
(c) is a condenser that condenses the steam coming out of the steam turbine (a), @ is the water from the condenser (c) to the drain tank>
j+ <Drain pipe. In addition, @(a)■ is a circulating water pump installed in the middle of the first hot water pipe (9), second hot water pipe 0 sand, and third hot water pipe), and 0υ is a circulating water pump installed in the middle of the first water supply pipe α1. The water supply pump is a condensate pump installed midway through the drain blind.

Note that (2) is a bypass duct that is provided separately from the exhaust gas discharge 'i#+1), which bypasses the exhaust gas when soot is likely to be generated.
This is to prevent soot from adhering to (7). <Row (c) is the waste discharge lJt pipe (1), bypass duct 0. All M+ upper and lower parts are the first tamper.

Next lid, main motion of $ +21; One step C for heat recovery action at time.
) (11) Water drain in Q6, each circulating water pump M
e? 4 @h sends to each evaporator tube (5) (6) (71) and heats it, converting it into steam.
8) Return to CI+) (+4). Then, the high pressure steam (for example, 6.51 g/ca) in the high a side brackish water separator (8)
(gauge pressure).

166°CN is further heated (for example, 11!1≠°1) to 245°C by the superheating pipe (4) and then supplied to the high B section of the steam turbine (A), and then immediately to the low pressure section of the steam turbine (A). is 3 atmospheres (e.g. i kg/nl (gauge pressure), 119°C) to the low pressure from inside the low pressure 011IQ water separator
) is supplied, and these clearly %+Cyotsu'7: R<'!
At the same time, the electric power generation unit 4.
C) is rotated and heat recovery is performed efficiently. Steam/turbine? The steam that passed through the tJ water container 6
1, it is condensed and sent to the 'C drain tank. Medium pressure steam (e.g. 4 kglol (gauge pressure), 151°C) in medium pressure ■1゛1 Brackish water mold release 0]
pH (7) Sent to place O] C-rθ''Sagawa Sayo, and if there is one in 9, Not, it will be seen in the air. In addition, the hot water in the medium pressure (ijl) water ν11 (the hot water in the vessel (11) is installed in the middle of the 24th part main <14
Next heat exchanger θ and θ units all through C each? 6 (moisture): [vessel (
8 > tll) tt Beauty 6-go water is force 11-no4 shi'Ct), so the middle moon two li:i fish 11 official (1υ entry [-1 part warm water temperature 1" is ("j', ＜become,
Therefore, medium pressure (till 1 njl at the entrance and exit of the evaporation tube (6)
This increases the difference in heat recovery and improves heat recovery efficiency.

6th grade I'4 J 戊
'l'jbA % medium dilution, low temperature) to efficiently perform hot ((I4) within the EC range. separation i
It is possible to increase the evaporation in the water molecule f+it by heating the water supplied to the tube, and also to reduce the temperature at the inlet of the evaporator tube on the medium pressure side. It is possible to widen the temperature difference between the entrance and exit of the evaporation tube and increase the efficiency of heat recovery by °C. Figure 2 shows the heat recovery j in the conventional system (a) and the system (1) of the present invention, respectively. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a comparison between the hot 1jv version of Mt1 example of the present invention and 4 (' is a schematic diagram, and 211 is the conventional system (a) and the present invention's system 0)). It is. (1)...Exhaust gas discharge pipe, (4)...Superheating pipe, (5
)...High pressure 11111 evaporator tube, (6)...Medium pressure side evaporation tube, (7)...Low pressure side heat absorption and adsorption, (8)...High pressure side steam moisture 141C vessel, (9)... No. 1 drought pipe, (11.
・・First steam pipe, (Ill・Intermediate pressure 1i111Brackish water i'
ilt: blue, a'4...second hot water pipe. Q3...Second steam pipe, (I4...Low pressure I011 brackish water separator, (1...Third hot water pipe, (1T...Third pipe - trachea, αη...Primary heat Exchanger 2 (to)... Secondary heat exchanger clamp, C11... 1st water supply pipe, 0)... 2nd water supply pipe 44+)... High pressure Z air supply pipe, @...・Steamer] Don. Morning...Low pressure steam I1 (supply pipe, V◆...Zhongzheng steam supply pipe, Vl...departure '1'lV pier agent Hiroshi Moriki

Claims (1)

[Claims] 1. A superheating tube, a high-pressure side evaporation tube, an intermediate-pressure side evaporation tube, and a low-pressure side evaporation tube are arranged in the exhaust gas discharge pipe in order from bottom to top, and the high-pressure side evaporation pipe and high-pressure side brackish water separator are 1
The hot water pipe and the first steam pipe are used to connect the medium pressure side evaporation pipe and the medium pressure side brackish water Ilt vessel to the second hot water pipe and the second steam pipe, and the low pressure side evaporation pipe and the low pressure 1141.1 brackish water inverter are connected to the second hot water pipe and the second steam pipe. A first water supply pipe is provided which is connected to an eighth hot water pipe and a third steam pipe to supply water to the low pressure side brackish water separator, and the first water supply pipe is heated in the middle of the second hot water pipe. A primary heat exchanger is provided, and a second water supply pipe is provided for supplying a portion of the hot water in the first water supply pipe heated by the primary heat exchanger to the high pressure side and intermediate pressure side/brackish water separator, and the above-mentioned A secondary heat exchanger that further heats the hot water in the second water supply pipe is installed at a position upstream of the primary heat exchanger in the middle of the second hot water pipe, and the high pressure steam in the high pressure side brackish water separator is transferred to the superheating pipe. A three-stage pressure exhaust gas economizer characterized in that the low-pressure steam in the partial-pressure side brackish water separator is guided to the low-pressure part of the steam turbine, and the intermediate-pressure steam in the intermediate-pressure side brackish water separator is provided for general use or to the steam turbine. system.