JPS59128954A - Waste heat correcting device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To utilize the waste heat from an internal-combustion engine by allowing the coolant which has taken up the waste heat to work without seething but evaporating itself to be used as steam. CONSTITUTION:An engine coolant 21 pressurized by a circulative pump 1 is supplied to an internal-combustion engine 2 to cool it, and the waste heat taken up by this coolant now in the form of a hot water 22 is led to a flush tank 5 to separate there into steam and water drops, wherefrom the steam 6 is sent to terminals for utilization while the water drops are joined with refill water 9 to be sent again to the engine 2 by the above-mentioned pump 1. Inside the jacket of this engine 2 is kept pressurized, and the outgoing pressure of the hot water from the engine is adjusted by an adjusting valve 32, which is controlled by a pressure controller 31, in order to prevent evaporation of the coolant. When the water temp. inside the jacket has risen excessively, a temp. sensor 101 will open a relief valve 102 to hold the coolant flow to the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waste heat recovery device for an internal combustion engine that evaporates the cooling water itself and effectively utilizes it as steam without boiling the cooling water that has absorbed the waste heat of the internal combustion engine.

When an internal combustion engine is operated, waste heat is released into the exhaust gas and cooling water, and one of the current challenges is how to utilize this effectively.

Of these, the temperature of the exhaust gas is high, so it is easy to obtain one steam from the waste heat boiler. However, the most common form of cooling water is to use heat as hot water, but unlike steam, the uses of hot water are narrow. On the other hand, there are the following known methods for obtaining and utilizing steam from cooling water, but each method has its own drawbacks.

One type of boiling cooling method is to boil water in the cylinder jacket of an internal combustion engine and take it out of the engine as a brackish water mixture to separate the brackish water, but if the control method is poor, it can lead to engine overheating and burnout. There is danger. Another pressurized water-cooled heat exchange system uses a closed pressurized internal combustion engine cooling water system to increase water m without boiling it, and then heat exchanges this hot water with make-up water in a separate system to evaporate the make-up water. However, this method has disadvantages such as a temperature difference occurring in the heat exchanger and high equipment costs.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to propose a waste heat recovery device for an internal combustion engine that does not allow boiling in the engine and that generates steam from cooling water without a heat exchanger. do.

Next, one embodiment of the present invention will be described with reference to the drawings.

The figure is a configuration diagram of an embodiment, 1 is a cooling water circulation pump,
2 is an internal combustion engine, 21 is pressurized cooling water that can be pressurized input from a circulation pump IK, and 22 is high temperature cooling water that has absorbed waste heat from the internal combustion engine.

31 and 32 t-i Pressure in the sump that keeps the inside of the engine jacket pressurized and prevents water from boiling 1i111'MI
regulator and regulating valve. 5 is a Naratsushi tank which introduces high temperature cooling water 22 and separates it into steam and water, 51 is an internal water droplet P# container %52 water, 671 and 72 are ≠ water level control devices in the Lasshirin tank. and an adjustment valve, which adjusts the make-up water 9 supplied by the make-up cooling water pump 8. Further, 101 is a temperature detector, 102 is a TLZ relief valve controlled by the detector, and 103 is a throttle valve.

Next, the operation of this embodiment will be explained. In the figure, the cooling water 21 pressurized by the circulation pump 1 absorbs waste heat after cooling the internal combustion engine @2, and is sent to the high temperature cooling water 22 and the shishiflash tank 5. The regulating valve 32 is controlled by the pressure controller 31 in order to keep the interior pressurized and prevent the cooling water from boiling. Since the internal pressure in the flash tank 5 is lower than the primary side pressure of the regulating valve 32, the high-temperature cooling water 22 flashes at the same time it flows into the rush tank 5 and separates into steam and water droplets, and the steam 6 flows through the steam pipe. After that, it is sent to the end of use. On the other hand, the separated water droplets are combined with makeup water 9, which is fed through makeup water pump 8 and adjustment valve 72 controlled by water level control device 71, and are again sent to internal combustion engine 2 by circulation pump IK. The regulating valve 32 throttles the high temperature cooling water 22 to maintain the pressure inside the jacket in order to prevent boiling inside the jacket.
In the unlikely event that this malfunctions, the water flow will drip onto the internal combustion engine 2.
In order to prevent the cooling water from burning out, the temperature detector 101 is activated by an excessive rise in the water temperature inside the jacket, and the relief valve 102 (r-opens in response to a command from the temperature detector 101 to ensure water flow even in an emergency.) Take limited flow.

Of course, it would be even more useful if a known method for recovering heat from the exhaust gas by passing the exhaust gas from the internal combustion engine 2 through a heat exchanger (not shown) provided in the flash tank 5 is also used.

As explained above, the present invention tJ, waste heat recovery type internal combustion engine r
At JA, a pressurized cooling water circulation system installed on the tower gate side! 3; 1 Bonf, a regulating valve for high-temperature cooling water provided on the engine outlet side, and the inlet of this Nti regulating valve (which has an internal pressure lower than the llQ internal pressure, and the moisture content of the high-temperature cooling water introduced through this regulating valve). A flash tank is provided for separating water and steam to obtain steam and supplying water to the circulation valve, and a flow rate limiter is provided at the engine outlet and the cooling water supply path ill to the engine that operates when the engine temperature rises. Since this is a waste heat recovery device for an internal combustion engine equipped with a valve, it evaporates the cooling water itself without boiling the cooling water inside the jacket of the internal combustion engine, and easily generates steam with high energy utilization.
It has excellent features that effectively save energy.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention. 11' is a circulation bo/b, 2 is an internal combustion engine, 21 is pressurized cooling water, 221'u is high temperature cooling water, and 31 is a pressure controller. 32 is an iA regulating valve, 5 is a flash tank, 51 is a water droplet separator, 52 L/i water, 6 is steam, 71 L/i water level control device% 72 is a regulating valve, 8 is a supplementary cooling water bottle, and 9 is supplementary water. Patent dispatcher, −shi′

Claims (1)

[Claims] In a waste heat recovery internal combustion engine, there is a circulation pump for pressurizing cooling water provided on the engine inlet side, a regulating valve for high-temperature cooling water provided on the engine outlet side, and an internal pressure on the artificial side of this regulating valve that is lower than that of the regulating valve. A flash tank is provided which has an internal pressure and separates moisture and steam from the high-temperature cooling water introduced through this regulating valve to obtain steam and supplies water to the circulation bong 7. A waste heat recovery device for an internal combustion engine, characterized in that a relief valve with a flow rate restriction that is activated when the engine temperature rises is provided between a cooling water supply path to the engine.