SU1617172A1 - Power plant - Google Patents

Abstract

The invention relates to mechanical engineering and improves the efficiency of a plant comprising a diesel engine and a Stirling engine, the heater of which is located in the diesel exhaust gas line. The diesel cylinder is made integral in the form of upper and lower parts, separated from each other by a heat-insulating gasket 18. In the upper part 11 of the cylinder and in its head 10 there are channels for circulation of the coolant included in the main line 12 of the working fluid circulation of the Stirling engine in the section between the regenerator 13 and a heater 9. When the Stirling engine's working medium flows from the cold cavity into the hot cavity, it goes after the regenerator 13 into the channels of the upper part 11 of the cylinder and the head 10, which serve as heat exchange they are heated there by the heat of the combustion products. Further heating is carried out by the heat of the exhaust gases of a diesel engine in the heater 9. The use of the heat of combustion products for additional heating of the working fluid of the Stirling engine makes it possible to increase the efficiency of the installation. 3 il.

Description

The invention relates to mechanical engineering, in particular to engine-building, and specifically to power plants consisting of a diesel engine and a Stirling engine, the heater of which is located in the diesel exhaust gas line.

The purpose of the invention is to increase the efficiency of the installation.

Figure 1 presents the setup; FIG. 2 shows a system for transferring heat from a diesel engine to a Stirling engine; on fig.Z - thermodynamic cycle.

The installation contains diesel 1 and a Stirling engine 2. Each cylinder 3 diesel and a Stirling engine heater are associated with a two-stage turbo-supercharging system consisting of high and low pressure turbine 4 and 5, respectively, two recuperative heat exchangers 6, a low pressure compressor 7 and a high pressure compressor 8 . The Stirling engine 2 turns on the heater 9. In addition, the head 10, the upper part 11 of the cylinder of diesel 1 is made with channels for the circulation of coolant and serve as additional heat exchangers for the Stirling engine 2. Heat exchangers 10 and 11 are included in line 12 between the regenerator 13 and the heater 9 adjacent to the upper part of the cylinder 14 of the Stirling engine 2. The lower part 15 of the cylinder of the diesel engine 1 is cooled (in the displacement section of the piston seal 16) by any known method using gaseous or liquid heat carriers (air or water). The piston 17 and the cylinder of diesel 1 are made of two parts. AT

ABOUT;

A cylinder insulator 18 is installed on the cylinder. The lower part of the piston 17 is provided with a seal 16, and the upper end of the piston 17 is coated with high-temperature oxides.

In the cylinder 14 of the Stirling engine 2, a ByrecHiiTenb 1S piston 20 is placed. To maintain the required pressure in the cylinder 14 of the engine 2, a compressor 22 is connected to the cooler 21. A valve 23 controlled by the control and control unit 24 is installed between the latter and the cooler. Moreover, the unit 24 is simultaneously (but connected to the compressor 22 and to the thermocouples of the heat exchangers 10 and 11 (thermo-Ps1ry not shown).

The operation of the plant combines the processes occurring during the operation of a diesel engine and a Stirling engine. In the initial stage of the installation, diesel 1. is started. When the diesel 1 is operated, a certain temperature is reached in the heat exchangers 10 and 11. When the working fluid of the Stirling engine flows from the cold cavity to the hot cavity, after the regenerator 13 it enters additional heat exchangers 10 and 11, it heats up products of combustion. Further heating is carried out by the heat of the exhaust gases of the diesel engine in the heater 9 of the Stirling engine 2. The compressor 22 creates an initial pressure in the cylinder 14 and turns off. If the temperature in the heat exchangers 10 and 11, in particular, is 20-40 ° C higher than the temperature of the exhaust gases of the diesel engines, the unit 24 turns on the compressor 22 and thus the pressure rises in the cylinder 14 of the Stirling engine 2 and the cooling of the heat exchangers 10 and 11 is intensified. Otherwise In the event of pressure relief in the cylinder 14, a control valve 23 serves.

The heat exchangers 10 and 11 are made and connected so that the working fluid from the regenerator 13 is directed along the 12 V line to the channels of the upper part of the cylinder of the diesel 1, and | then it enters the channels of the cylinder head of the same diesel 1. The heated gas through line 12 enters the cylinder 14 of the Stirling engine 2 and, expanding, performs work. Since the temperature of the working medium of the Stirling engine does not exceed the temperature of the exhaust gases of the diesel channels in the upper part of the cylinder and the head of the diesel engine, it ensures the removal of heat from the combustion products of the engine and cooling of these elements to the specified allowable temperature. Fig. 3 shows the thermodynamic cycle in the proposed installation: abb-process of air compression in the compressor 7 of low pressure; bv - the process of compressing air in a high pressure compressor 8; in g - heating the air in the recuperative heat exchanger 6; rd - diesel compression process; dz - heat supply (combustion); Wf-heat supply 10 at the beginning of the expansion process (T const); W-e - expansion of combustion products in a cylinder of diesel 1 with heat transfer Qci to the working body of a Stirling engine 2; e - and losses due to resistance in the exhaust system 15; ik - heat transfer Qc2 of exhaust gases to heater 9 of Stirling engine 2; Q-the process of expanding exhaust gases in a high-pressure turbine 4; lm - cooling the exhaust 20 gases in the regenerative heat exchanger 6; md - expansion process in low pressure turbine 5. The shaded area under the curve corresponds to the amount of heat Qci transmitted from the high-temperature parts of the cylinder and diesel head 1 to the working body of the Stirling engine 2, and the area under the curve ik corresponds to the amount of heat Qc2 before the ground of the exhaust gases of the diesel to the heater 9 30 Stirling engine 2. The use of heat from the combustion products of diesel for additional heating of the working fluid of the Stirling engine allows to increase the efficiency of the installation. 35

Claims (1)

Claims of the invention A power plant comprising a di- / zel equipped with cylinders, their heads and a two-stage turbo-charge supercharging system, and a Stirling engine equipped with a working fluid circulation line between the cold and hot cavities through a cooler, a regenerator and a heater, and a heater The Stirling engine 45 is located in a diesel exhaust line, characterized in that, in order to increase economically: for each diesel cylinder, it is made composite in the form of upper and lower parts, 50 separated. The heat insulating gasket from the other, the upper part of each cylinder and its head are made with channels for coolant circulation, and these channels are connected to the working line 55 of the Stirling engine between the regenerator and the heater. Air or 4v X Schig.1 Water system compressor x or Schg / gz 3 and