Heat exchange – Regenerator – Checker brick structure
Patent
1984-07-16
1986-06-10
Richter, Sheldon J.
Heat exchange
Regenerator
Checker brick structure
60320, 165 51, 165 95, 165103, F28G 1300
Patent
active
045937486
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL BACKGROUND OF THE INVENTION
The invention relates to a process for increasing the efficiency or for the cleaning of heat exchangers used for exhaust cooling gases from internal combustion engines of stationary plants or installations for the operation of heat pumps or for the combined generation of current and heat.
STATE OF THE ART
A process for the removal of sediments from oil-fired furnaces is known from British Pat. No. 849 053 in which the hot exhaust gases are passed through a heat exchanger and the removal of deposits, particularly sulphurous deposits on the primary heat exchanger surfaces, can be improved by heating these heat exchanger surfaces to an elevated temperature by cutting off the secondary, gaseous heat transfer medium with the object of drying the deposits. By drying the deposits on the primary side, their removal by washing with water is presumed to be facilitated. This British Pat. No. 849 053 149 mentions 149.degree. C. (300.degree. F.) as the maximum temperature.
Heat exchangers are understood to mean heat exchangers with stationary heat exchanger conduits for a primary and a secondary heat transfer medium in which either medium comes into contact with one side of the conduit wall.
In stationary plants for the operation of heat pumps or for the combined generation of current and heat which use internal combustion engines for the drive, it is common practice to fully exploit the heat generated automatically in addition to the mechanical power for the operation of the heat pump or of the generator for producing the electric current. In this case, it is relatively easy to eliminate the heat generated in the internal combustion engine, since usually such internal combustion engines are water-cooled internal combustion engines. However, even in air-cooled internal combustion engines it is possible without further provisions to deliver the heat generated by the engine to a heating system, say, by means of a hot-water reservoir acting as a buffer tank. However, a considerable amount of the energy fed to the engine with the fuels is still contained in the exhaust gases; this part is on the order of 25 to 35% of the amount of energy fed by the fuel. Therefore, for a cost-effective operation it is practically indispensable to use the heat still contained in the exhaust gases for heating purposes or for preparing hot water. These exhaust gases are therefore passed through heat exchangers in order to fully exploit the useful heat contained therein.
If such stationary plants are operated with liquid fuels, and in particular with diesel or heating oil or even with mixtures of heating oil, diesel oil and properly processed old oil, sediments will over time be deposited on the heat exchanger surfaces, that is to say, soot particles contained in the exhaust gas from the internal combustion engines will be deposited on the walls of the heat exchanger. If a heat exchanger is involved that is very active and in which the dew point of the exhaust gases from the internal combustion engine is still not reached, there will further be formed on the heat exchanger surfaces a condensate to which these soot particles will also adhere. During operation, only superelevated temperatures could prevent such condensate from forming, but this would deleteriously affect the overall efficiency of such a stationary plant for the operation of heat pumps or for combined current and heat generation. Depending on the fuel employed for the internal combustion engine, such a condensate that precipitates on the heat exchanger surfaces consists of a diluted solution of a sulphurous acid and/or sulphuric acid. Furthermore, in addition to soot, ash particles contained in the exhaust gas can also be deposited on the heat exchanger surfaces. Therefore, in those areas of the heat exchanger where the dew point is not reached, a slimy pulp of soot, ash, water and said acids is formed, with the possibility that the latter may also corrode the heat exchanger surfaces.
These phenomena will cause the pipe walls of the h
REFERENCES:
patent: 3818975 (1974-06-01), Tokumitsu et al.
patent: 4509589 (1985-04-01), Carlson et al.
Kramb Mothermik KG
Richter Sheldon J.
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