DE9405466U1 - CHP plant - Google Patents

Description

Description

Combined heat and power plant

State of the art

DE 4237532 mentions a combined heat and power plant with an internal combustion engine to drive a generator, which is equipped with a liquid-operated cooling circuit and surrounded by a metal casing through which cooling water flows, which in turn supplies the waste heat for recycling. Such double-walled housings for the internal combustion engine are provided with webs and similar elements between the inner and outer walls to create sufficient stability, which act as thermal bridges to lose useful energy to the environment and counteract the intended sound absorption.

Since the generator and other heat-conducting operating elements are difficult to integrate in such a metal casing, these heat components are lost during use. The well-known double-walled metal casing, both separately for the internal combustion engine and for the generator, is complex to construct, since it has to be equipped with fastening devices or penetrated to ensure the mechanical connection of the machines to the foundation. The production of such a casing or a corresponding double-walled housing as a complete cast part is only more cost-effective for large quantities.

In addition, thermal bridges and increased sound transmission to the environment are created.

A final external heat and sound insulation of the cogeneration plant is technically complex due to the different surfaces of the casing.

The combined heat and power plants constructed with such a casing require specially manufactured combustion engines and generators, which, due to their cost, prevent the widespread use of these energy generators.

problem

The invention specified in the protection claim is based on the problem of creating a combined heat and power plant in which

- the total heat energy generated, e.g. from combustion, friction, electrical current flow, etc., can be recycled ;

- conventional internal combustion engines and generators from mass production can be used;

- the measures for cooling circuit, sound insulation and mechanical strength of the assemblies are mutually inclusive and

- an external design of the system is achieved which facilitates final heat and sound insulation.

invention

The problem is solved with the measures of the protection claim. By installing the internal combustion engine and generator in an internal container that encloses it on all sides, all the energy generated in the system in the form of heat is passed through the surrounding water jacket, absorbed by it and the intended

for appropriate recycling.

The combustion heat is conducted directly into the water jacket via the cooling circuit. The heat generated due to friction in the bearings of the machines and in the clutch, as well as the ohmic heat generated in the generator, is released into the air in the operating room via the housing, windings and bearing assemblies and also passes into the water jacket through the inner container as soon as the temperature in the operating room exceeds the temperature set in the water jacket.

Due to the buoyancy of the inner container in the water (the aim is to achieve a balance between the buoyancy and weight of the inner container) and its design as a chassis for the machines, there is no need for struts and similar structural elements that form thermal and sound bridges .

This quasi-perfect heat dissipation system eliminates the need for additional and complex coolant ducts in the housing of the internal combustion engine or generator.

This means that conventional liquid-cooled internal combustion engines and generators can be used cost-effectively.

Advantageously, the fresh air required by the internal combustion engine can be used to increase the cooling of the generator.

The outer container as a load-bearing structure is only exposed to a reduced dynamic load due to the intermediate water jacket, and is therefore cost-effective and can be manufactured as a simple geometric shape, which is very conducive to final heat and sound insulation.

Description of the invention

An embodiment of the invention is explained with reference to the drawing.

An internal combustion engine 2 and a generator 3 coupled to it are installed in an operating room 1 of the combined heat and power plant. This operating room 1 is formed by an inner container 4, which also forms the chassis for these machines. The floating mounting of this chassis reduces the otherwise much higher strength requirements for such a machine frame.

Supply, operating and status signal lines 18 of the internal combustion engine 2 and the generator 3 are led into the inner container 4 through a seal 5. In order to keep the number of such passages low, it is expedient to divert the electrical energy generated by the generator 3 through the same passage and to let the fresh air for the internal combustion engine 2 into the operating room 1. For this purpose, it is advantageous to use the fresh air at the same time to cool the generator 3, for example through an air duct 6 that opens out at the intake manifold. The exhaust line 7 of the internal combustion engine 2 is laid mainly within a water jacket 8 by a corresponding design of the inner container 4, via which the floating bearing of the inner container 4 takes place in an outer container 9. It is advantageous to adjust the buoyancy for the inner container 4 by introducing suitable balancing weights so that it only rests against buffers 10, 11 of the outer container 9 with a small upward force. The elastic forces of these buffers 10, 11

can then be kept correspondingly low, which increases vibration and structure-borne noise damping. The other buffers 12, 13 only serve to center the inner container 4 in the outer container 9.

The latter has a simple geometric shape and essentially smooth external surfaces, which can be manufactured inexpensively and covered with a final thermal and acoustic insulation 19.

The internal combustion engine 2 is of a conventional type, water-cooled and operates with gaseous or liquid energy sources. The water jacket 8 can be included in the cooling circuit of the internal combustion engine 2 via a thermostat control known per se and thus forms the storage for all thermal energy that is generated in the operating room 1.

An intake port 15 leading into the internal combustion engine 2 and a drain port 17 leading out of a water pump 16 establish this connection with the water jacket 8.

The thermal energy stored in the water jacket 8 can be fed to corresponding industrial processes, space heating and/or domestic water preparation using means known per se and not shown.

Claims (1)

Claim for protection Combined heat and power plant with an internal combustion engine for driving a generator, which is equipped with a liquid-operated cooling circuit and is surrounded by a metal casing through which the cooling circuit also runs, which supplies the heat generated by the internal combustion engine to industrial processes, space heating and/or hot water preparation, characterized in that Internal combustion engine (2) and generator (3) are surrounded on all sides by an inner container (4) forming the operating space (1), which is mounted floating in a water jacket (8) and forms the complete chassis for internal combustion engine (2) and generator (3), whereby an outer container (9) delimiting the water jacket (8) on the other hand is designed as a supporting structure for the cogeneration plant.