Device for heat recovery from exhaust gases of internal combustion engine

 

(57) Abstract:

The invention relates to the field of engineering, namely the engine, and allows to increase the efficiency of the device for heat recovery from exhaust gases of internal combustion engines. The device has connected in series steam generator, the steam separator steam and liquid cavities, steam turbine, condenser pair, the capacity of the condensate and circulating pump. Liquid space of the steam separator is equipped with a measuring capacity with the liquid level sensor and communicated with capacity of condensate through a calibrated orifice, a circulation pump is provided with a bypass channel with the installed adjustable throttle controlled by a liquid level sensor. 1 Il.

The invention relates to mechanical engineering, in particular the engine and can be used in systems using secondary energy ice.

Known power plant in which the heat of exhaust gases is used to heat buildings and produce mechanical energy in an additional cycle (see U.S. Pat. USA 5640842, MKI6F 02 1/00).

The disadvantage of these devices are large of a courier envelope the item is received the device, containing connected in series steam generator, steam separator, steam turbine, condenser pair, the capacity of the condensate and circulating pump (see application Japan 58-40003, MKI F 01 To 25/10).

The disadvantage of this device is that at partial loads is irrational consumption of heat for heating the whole of the working fluid, including for heating the portion of the working fluid, which is not converted into steam in the steam generator.

Another disadvantage of this device is that there is a possibility of getting Nisporeni liquid phase of the steam turbine, resulting in deterioration in the quality of the processes occurring in the turbine, causing erosion and destruction of the blades and reduces the service life of the turbine.

The technical result of the invention is to improve the efficiency of the device for heat recovery from exhaust gases of the internal combustion engine by optimizing the flow rate of the working fluid through the steam generator and reduce the loss of energy inefficient heating not evaporated portion of the working fluid.

The technical result is achieved in that the device for heat recovery from exhaust gases of the engine unui cavities, steam turbine condenser steam collecting tank condensate, circulating pump and, according to the invention is equipped with the measuring tank connected to the liquid cavity of the steam separator, the liquid level sensor and communicated with capacity of condensate through a calibrated orifice, and adjustable choke placed in the bypass channel of the circulation pump is controlled by a liquid level sensor.

Implementation of the above solutions, it is possible to determine the consumption not evaporated in the steam generator of the working fluid through the height of a column of liquid in the measuring vessel. Changing consumption not evaporated in the steam generator of the working fluid will change the height of the column of liquid in the measuring vessel detected by the liquid level sensor. In combination with an adjustable choke placed in the bypass channel of the circulation pump and controlled from the liquid level sensor, all of the above elements help to determine the flow not evaporated in the steam generator of the working fluid and to minimize its quantity by regulating the flow of working fluid through the steam generator. All of this allows you to optimize, over the, is espressivo in the steam generator.

It should be noted that the above characteristics of the device ensure the implementation of the claimed effect only in the aggregate.

Further the invention is illustrated in the drawing.

The device has an internal combustion engine 1 with an exhaust manifold 2 and placed in it a steam generator 3, which communicates with the steam separator 4. Steam turbine 5 is connected to a steam cavity of the steam separator 4, and through a capacitor pair 6 to the condensate tank 7. In the channel connecting the collecting tank 7 and condensate the steam generator 3, posted by the circulation pump 8. Liquid space of the steam separator 4 is equipped with the measuring tank 9 with the liquid level sensor 10 and communicating with the tank for condensate collection 7 through a calibrated orifice 11. Bypass channel of the circulation pump 8 is equipped with an adjustable inductor 12 connected to the liquid level sensor 10.

The above-described device operates as follows.

Liquid working fluid from the condensate tank 7 by the circulation pump 8 is supplied to the steam generator 3, which evaporates due to the heat of exhaust gas of the internal combustion engine 1, arriving in the separation of the steam and liquid phases. The steam is routed to a steam turbine 5, which, extending, doing mechanical work. The exhaust steam in the condenser pair 6 is converted into a liquid, which is discharged in the tank for condensate collection 7. At the same time the liquid phase is taken from the steam separator 4 and enters into the measuring tank 9, and then through kalibrovane hole 11 in the collection vessel of condesate 7. The height of the column of liquid in the measuring container 9 determines consumption, not evaporated working fluid in the steam generator 3, which ultimately is registered by the liquid level sensor 10. The signal of the liquid level sensor 10 controls the adjustable orifice 12 through which changes the flow of the working fluid through the steam generator 3.

For example, when reducing the load of the internal combustion engine 1, the enthalpy of the exhaust gas decreases, which leads to increase in the not evaporated working fluid in the measuring tank 9, fixed liquid level sensor 10. The signal generated by the liquid level sensor 10, the driven throttle 12 increases the flow area, resulting in decreased flow rate of the working fluid through the steam generator 3. Accordingly decreases the level of liquid in the measuring container of the nya fluid 10. When installing a new liquid level adjustable throttle fixes his position corresponding to the new operation mode of the internal combustion engine.

This is achieved by throttling the working fluid supplied to the steam generator is reduced unproductive consumption of thermal energy for heating the working fluid, not evaporated in the steam generator. This improves the efficiency of the device and to reduce unsustainable consumption.

The advantages of the proposed technical solution in comparison with the prototype should include the following:

- improving the efficiency of the unit for controlling the flow of the working fluid depending on the operation mode of the internal combustion engine;

- high reliability and ease due to the absence of complex design elements involved in the regulatory process.

The economic effect from the use of the invention is achieved by more efficient use of thermal energy.

Device for heat recovery from exhaust gases of an internal combustion engine, containing connected in series steam generator, the steam separator steam and liquid cavities pairs the percentage the cavity of the steam separator is equipped with a measuring capacity with the liquid level sensor and communicated with capacity of condensate through a calibrated orifice, the circulation pump is provided with a bypass channel with the installed adjustable throttle controlled by a liquid level sensor.

 

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SUBSTANCE: invention can be used at mounting of heavy-weight condensers of steam turbines connected with several exhaust ports of steam turbine low-pressure cylinders. Invention can be used also at servicing and subsequent adjusting of steam turbines especially, high-power ones. Invention improves reliability and increases economy of turbine in operation owing to decreasing excess loads on exhaust parts of low-pressure cylinders and support foundation plates of exhaust parts from side of condenser, decreasing friction forces along support surfaces of low-pressure cylinders, deformation of supports, formation of cracks and increasing vibration stability of turboset at different loads and modes of operation. According to proposed method of mounting of steam turbine condenser connected with several exhaust ports of low-pressure cylinders including assembling, preliminary truing, welding of connecting branch pipes and fixing in space by means of calibrated setting strips under springs. After operation of turboset under load, position of condenser in space is corrected to reduce load on support belt of low-pressure cylinders by disconnecting exhaust branch pipes of turbine and condenser, filling condenser with water of designed mass, placing inserts between upper and lower branch pipes of designed mass, placing inserts between upper and lower branch pipes and subsequent connection of branch pipes of turbine and condenser. Disconnected condenser is filled with water whose mass corresponds to designed load ΔG taken from low-pressure cylinder which is determined by value of compression Δh of spring unit under each support of condenser, basing on its rigidity characteristic K. ΔG removed from low-pressure cylinder is =ΣΔh x K. Estimation of loads on support belt of low-pressure cylinders in process of complex tests is carried out by displacement pickups checking compression of spring under all supports of condenser, and grade pickups on built-in supports of low-pressure cylinders operating at continuous monitoring by means of processor-based devices.

EFFECT: improved reliability end economy of turbine.

2 cl, 2 dwg

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