TWI599715B - Engine waste heat power recovery system and method - Google Patents

Description

Engine waste heat power recovery system and method

The present invention relates to an engine, and more particularly to an engine waste heat power recovery system and method.

An existing power system for driving the rotation of a ship propeller includes a main engine, and a main shaft driven by the main engine and connected to the main shaft of the ship, and the main engine can be driven to drive the main engine to drive the ship. The propeller rotates to achieve the effect of moving the vessel.

However, the main engine often generates a lot of heat when it is in operation. These hot gases are discarded in the current use conditions. Because heat is also an energy, if it is directly discarded, it is not only a pity, but also not environmentally friendly.

Accordingly, it is an object of the present invention to provide an engine waste heat power recovery system and method.

Thus, the engine waste heat power recovery system of the present invention comprises a main power unit, an auxiliary power unit, and a transmission unit.

The main power unit includes a main engine, a main shaft connected and rotated by the main engine, and a heat pipe connected to the main engine, the auxiliary power unit includes a Stirling engine connected to the heat pipe, and a The Stirling engine interlocks the rotating output shaft, and the transmission unit is disposed between the main shaft and the output shaft to transmit the torque of the output shaft to the main shaft.

Therefore, the engine waste heat power recovery method of the present invention first drives a spindle to rotate at a predetermined rotation speed with a main engine, and measures an initial torque corresponding to the torque of the spindle through a spindle torque sensor, and then The Stirling engine operates to receive the waste heat of the main engine, and rotates an output shaft to rotate, and transmits the torque of the output shaft to the main shaft through a transmission unit, and measures the output by an output shaft speed sensor. An output shaft speed of the rotational speed of the shaft, and a control unit driving a gearbox module disposed between the Stirling engine and the output shaft to change a gear ratio such that the output shaft has an output shaft target speed The target rotates, the output shaft target speed is greater than the predetermined speed, and is less than the sum of the predetermined speed and a first speed offset, and the ratio of the first speed offset to the predetermined speed is no more than 1/300.

The utility model has the advantages that: by the arrangement of the main power unit, the auxiliary power unit and the transmission unit, the waste heat of the main engine can drive the Stirling engine to provide auxiliary torque, thereby achieving the effect of waste heat power recovery, so It is indeed possible to achieve the object of the invention.

2‧‧‧Main power unit

21‧‧‧ main engine

22‧‧‧ Spindle

23‧‧‧Heat pipe

24‧‧‧Electronic throttle

25‧‧‧Boat propeller

3‧‧‧Auxiliary power unit

31‧‧‧ Sterling Engine

32‧‧‧ Output shaft

33‧‧‧Auxiliary shaft

34‧‧‧Transmission module

341‧‧‧Transmission gear set

342‧‧‧Variable Sensor

343‧‧‧ Variable speed motor

35‧‧‧Low temperature heat pipe

4‧‧‧Transmission unit

41‧‧‧First transmission gear

42‧‧‧ one-way bearing

43‧‧‧Second transmission gear

44‧‧‧Drive chain

5‧‧‧Measurement unit

51‧‧‧Spindle speed sensor

52‧‧‧Spindle Torque Sensor

53‧‧‧Auxiliary shaft speed sensor

54‧‧‧ Output shaft speed sensor

55‧‧‧ Output shaft torque sensor

6‧‧‧Control unit

71~79‧‧‧Steps for engine waste heat recovery method

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic diagram of an embodiment of the engine waste heat power recovery system and method of the present invention, illustrating an engine waste heat power recovery FIG. 2 is a circuit block diagram of the embodiment; and FIG. 3 is a flow chart of the embodiment, illustrating the steps of an engine waste heat power recovery method.

Referring to Figures 1, 2 and 3, an embodiment of the engine waste heat power recovery system and method of the present invention comprises a main power unit 2, an auxiliary power unit 3, a transmission unit 4, and a measuring unit. 5, and a control unit 6.

The main power unit 2 includes a main engine 21, a main shaft 22 connected and rotated by the main engine 21, a heat pipe 23 connected to the main engine 21, and a main engine 21 connected to the main engine 21 and electrically connected to the control unit 6. The electronic throttle 24 for adjusting the amount of oil entering the main engine 21 is adjusted.

The auxiliary power unit 3 includes a Stirling engine 31 connected to the heat pipe 23, an output shaft 32 that is rotated by the Stirling engine 31, and an auxiliary shaft connected and rotated by the Stirling engine 31. 33, a set on the auxiliary shaft 33 and the A transmission module 34 between the output shafts 32, and a low temperature heat exhaust pipe 35 connected to the Stirling engine 31. In the present embodiment, the Stirling engine 31 is operated by receiving the waste heat discharged from the operation of the main engine 21 via the heat transfer pipe 23, and discharges the used low temperature air through the low temperature heat exhaust pipe 35.

The transmission module 34 has a shift gear set 341 connecting the auxiliary shaft 33 and the output shaft 32, a shifting speed connecting the shift gear set 341 and electrically connecting the control unit 6 to detect the gear ratio of the shift gear set 341. A sensor 342, and a variable speed motor 343 electrically connected to the control unit 6 for switching the gear ratio of the shift gear set 342. In the present embodiment, the shifting gear set 341 is changeable by the driving of the shifting motor 343 to switch to a different gear ratio, and the shifting sensor 342 is for detecting the position of the shifting gear set 341. The corresponding gear ratio can be known.

The transmission unit 4 is disposed between the main shaft 22 and the output shaft 32 to transmit the torque of the output shaft 32 to the main shaft 22, and includes a first transmission gear 41 connected to the output shaft 32, and a main transmission gear 41 disposed on the main shaft a one-way bearing 42 of 22, a second transmission gear 43 disposed on the one-way bearing 42, and a first transmission gear 41 and the second transmission gear 43 are respectively driven by the first transmission gear 41. Drive chain 44.

The measuring unit 5 includes a spindle speed sensor 51 disposed on the spindle 22 to measure the rotational speed of the spindle 22, a spindle torque sensor 52 disposed on the spindle 22 to measure the torque of the spindle 22, One set on the auxiliary shaft 33 to measure the auxiliary An auxiliary shaft speed sensor 53 for rotating the shaft 33, an output shaft speed sensor 54 disposed on the output shaft 32 to measure the rotational speed of the output shaft 32, and a set on the output shaft 32 for measuring An output shaft torque sensor 55 that outputs the torque of the shaft 32.

The control unit 6 is electrically connected to the electronic throttle 24, the shift sensor 342 of the transmission module 34, the variable speed motor 343, the spindle rotational speed sensor 51, the spindle torque sensor 52, and the auxiliary shaft rotational speed sense. a measuring device 53, the output shaft speed sensor 54 and the output shaft torque sensor 55, and calculating a shift gear ratio according to the rotational speed measured by the spindle rotational speed sensor 51 and the auxiliary shaft rotational speed sensor 53 Further, the transmission module 34 is controlled to operate at the transmission gear ratio.

The engine waste heat power recovery method includes the following steps 71-79.

In the step 71, the main engine 22 is driven by the main engine 21 to rotate at a predetermined rotation speed, and an initial torque corresponding to the torque of the main shaft 22 is measured through the main shaft torque sensor 52.

In the step 72, the spindle speed sensor 51 measures the rotation speed of the corresponding spindle 22, and determines whether the spindle 22 reaches the predetermined rotation speed. When the spindle 22 does not reach the predetermined rotation speed, step 71 is performed. When the spindle 22 reaches the predetermined rotational speed, step 73 is performed.

In the step 73, the Stirling engine 31 receives the waste heat of the main engine 21 and operates, and the output shaft 32 is rotated, and the torque of the output shaft 32 is transmitted to the main shaft 22 through the transmission unit 4.

In this step 74, an output shaft rotational speed corresponding to the rotational speed of the output shaft 32 is measured by the output shaft rotational speed sensor 54.

In the step 75, the control unit 6 drives the transmission module 34 disposed between the Stirling engine 31 and the output shaft 32 to change the gear ratio so that the output shaft 32 has an output shaft target speed. Rotating for the target, the output shaft target speed is greater than the predetermined speed and less than the sum of the predetermined speed and a first speed offset.

In this step 76, an instantaneous torque corresponding to the torque of the main shaft 22 is measured by the spindle torque sensor 52.

In the step 77, it is determined whether the instantaneous torque has decreased by more than a predetermined torque relative to the initial torque. When the instantaneous torque has decreased relative to the initial torque and does not exceed the predetermined torque, step 76 is performed, when the instantaneous torque is relative to the initial torque. When the torque has dropped beyond the predetermined torque, step 78 is performed.

In this step 78, the electronic throttle 24 is controlled by the control unit 6 to reduce the amount of oil entering the main engine 21.

In the step 79, the spindle speed sensor 51 measures the rotation speed of the corresponding spindle 22, and determines whether the rotation speed of the spindle 22 is lower than a predetermined downward rotation speed, when the rotation speed of the spindle 22 is not lower than the predetermined decrease. At the time of the rotation, step 76 is performed. When the rotation speed of the main shaft 22 is lower than the predetermined lower rotation speed, step 71 is performed. It is to be noted that the predetermined lower rotation speed is lower than the predetermined rotation speed.

For example, in the present embodiment, the main shaft 22 is rotated to drive a ship propeller 25 connected to the main shaft 22 to rotate. When the predetermined rotational speed is 3000 revolutions per minute, the main engine 21 is driven. The spindle 22 is operated until the rotational speed of the main shaft 22 reaches the predetermined rotational speed, and the measured torque of the main shaft 22 is the initial torque, and then the waste heat generated by the main engine 21 drives the Stirling. The engine 31 is operated, and the auxiliary shaft 33 is driven to run at 2003 rpm, and the output shaft 32 is rotated by the shift gear set 341. At this time, the control unit 6 rotates according to the actual output shaft speed of the output shaft 32 and the target. Calculating the rotational speed to determine the output shaft target rotational speed, wherein the output rotational speed of the output shaft is greater than the predetermined rotational speed and less than the sum of the predetermined rotational speed and the first rotational speed offset, where the first rotational speed offset is 10 revolutions per minute, so the output shaft target speed should be 3005 revolutions per minute, so the control unit 6 will drive the gear ratio of the transmission module 34 to change to 1:1.5.

The output shaft 32 then interlocks the first transmission gear 41, the transmission chain 44, the second transmission gear 43 and the one-way bearing 42 to rotate, since the one-way bearing 42 is designed to be compliant with the outer side of the one-way bearing 42. The lubrication rotation is stopped when the rotational speed is greater than the forward rotational speed of the main shaft 22, and the lubrication rotation is maintained when the outward rotational speed of the one-way bearing 42 is lower than the forward rotational speed of the inner shaft 22 of the inner side. The one-way bearing 42 does not have a lubrication rotation effect at this time. Therefore, when the one-way bearing 42 rotates, the spindle 22 rotates to transmit the torque of the output shaft 32 to the main shaft 22. At this time, the main engine 21 is maintained. The rotation of the spindle 22 does not exceed the predetermined The rotational speed, therefore, the instantaneous torque applied to the main shaft 22 may decrease, and once the instantaneous torque has decreased relative to the predetermined torque relative to the predetermined torque, the torque provided by the Stirling engine 31 is sufficient, and therefore must be lowered The torque of the main engine 21, at this time, the control unit 6 will drive the electronic throttle 24 to lower the oil intake of the main engine 21, thereby saving the fuel consumption of the main engine 21.

It should be noted that when the forward rotational speed of the output shaft 32 is lower than the forward rotational speed of the main shaft 22, the outward rotational speed of the one-way bearing 42 is lower than the forward rotation of the main shaft 22 at the inner side. The speed is maintained while the lubrication is rotated, so that the torsion of the output shaft 32 is absorbed by the lubrication rotation effect of the one-way bearing 42 and is not transmitted to the main shaft 22.

In summary, by the arrangement of the main power unit 2, the auxiliary power unit 3 and the transmission unit 4, the waste heat of the main engine 21 can drive the Stirling engine 31 to provide auxiliary torque, thereby achieving waste heat power recovery. The effect of the present invention is indeed achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

2‧‧‧Main power unit

21‧‧‧ main engine

22‧‧‧ Spindle

23‧‧‧Heat pipe

24‧‧‧Electronic throttle

25‧‧‧Boat propeller

3‧‧‧Auxiliary power unit

31‧‧‧ Sterling Engine

32‧‧‧ Output shaft

33‧‧‧Auxiliary shaft

34‧‧‧Transmission module

341‧‧‧Transmission gear set

342‧‧‧Variable Sensor

343‧‧‧ Variable speed motor

35‧‧‧Low temperature heat pipe

4‧‧‧Transmission unit

41‧‧‧First transmission gear

42‧‧‧ one-way bearing

43‧‧‧Second transmission gear

44‧‧‧Drive chain

6‧‧‧Control unit

Claims (8)

An engine waste heat power recovery system comprising: a main power unit, comprising a main engine, a main shaft connected and driven by the main engine, and a heat pipe connected to the main engine; an auxiliary power unit including a connection a Stirling engine of the heat pipe, an output shaft that is rotated by the Stirling engine, an auxiliary shaft that is coupled and rotated by the Stirling engine, and a set between the auxiliary shaft and the output shaft a transmission unit; a transmission unit disposed between the main shaft and the output shaft to transmit the torque of the output shaft to the main shaft; a measuring unit comprising a measuring unit disposed on the main shaft to measure the rotational speed of the main shaft a spindle speed sensor, a spindle torque sensor disposed on the spindle to measure the torque of the spindle, and an auxiliary shaft speed sensor disposed on the auxiliary shaft to measure the rotation speed of the auxiliary shaft, The output shaft is an output shaft speed sensor for measuring the rotation speed of the output shaft, and an output shaft torque sensor disposed on the output shaft to measure the torque of the output shaft; and a control unit electrically connected The gearbox module, the spindle speed sensor, the spindle torque sensor, the auxiliary shaft speed sensor, the output shaft speed sensor and the output shaft torque sensor, and according to the spindle speed sense The speed measured by the detector and the auxiliary shaft speed sensor calculates a shift gear ratio, and then controls the gearbox module to operate at the shift gear ratio. The engine waste heat power recovery system of claim 1, wherein the transmission module has a shift gear set connecting the auxiliary shaft and the output shaft, a shifting sensor coupled to the shifting gear set and electrically coupled to the control unit to detect a gear ratio of the shifting gear set, and a shifting motor electrically coupled to the control unit for switching a gear ratio of the shifting gear set. The engine waste heat power recovery system of claim 2, wherein the main power unit further comprises an electronic throttle connected to the main engine and electrically connected to the control unit to adjust the fuel intake of the main engine. The engine waste heat power recovery system of claim 3, the transmission unit includes a first transmission gear coupled to the output shaft, a one-way bearing disposed on the main shaft, and a second transmission gear disposed on the one-way bearing And a transmission chain respectively disposed on the first transmission gear and the second transmission gear and driven to rotate by the first transmission gear. An engine waste heat power recovery method, the method comprising the following steps: (A) driving a spindle to rotate at a predetermined speed with a main engine, and measuring an initial torque corresponding to the spindle through a spindle torque sensor (B) operating with a Stirling engine receiving the waste heat of the main engine, and interlocking an output shaft to rotate, and transmitting the torque of the output shaft to the main shaft through a transmission unit; (C) an output shaft The speed sensor measures an output shaft speed corresponding to the speed of the output shaft; and (D) drives a gearbox module disposed between the Stirling engine and the output shaft to change a gear ratio by a control unit, In order to rotate the output shaft with an output shaft target speed, the output shaft target speed is greater than The predetermined rotational speed is less than the sum of the predetermined rotational speed and a first rotational speed offset, and the ratio of the first rotational speed offset to the predetermined rotational speed is not greater than 1/300. The method for recovering the waste heat of the engine according to claim 5, further comprising a step (E), a step (F) and a step (G) after the step (D), in the step (E), The spindle torque sensor measures an instantaneous torque corresponding to the torque of the spindle. In step (F), it is determined whether the instantaneous torque has decreased relative to the initial torque by more than a predetermined torque, and the instantaneous torque has decreased relative to the initial torque. When the predetermined torque is not exceeded, step (E) is performed. When the instantaneous torque has decreased relative to the initial torque, the step (G) is performed. In the step (G), the electronic throttle is controlled by the control unit. To reduce the amount of oil entering the main engine. The engine waste heat power recovery method according to claim 6, further comprising a step (H) between the step (A) and the step (B), in which the spindle speed is sensed. The device measures the rotation speed of the spindle and determines whether the spindle reaches the predetermined rotation speed. When the spindle does not reach the predetermined rotation speed, step (A) is performed, and when the spindle reaches the predetermined rotation speed, step (B) is performed. The engine waste heat power recovery method according to claim 7, further comprising a step (I) after the step (G), in which the spindle speed sensor is used to measure the corresponding spindle Speed, and determining whether the speed of the spindle is lower than a predetermined falling speed, when the speed of the spindle is not lower than the predetermined falling speed, performing step (E), when the speed of the spindle is lower than the predetermined falling speed, performing In step (A), the predetermined falling speed is lower than the predetermined speed.