Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1984-02-29
1985-10-08
Husar, Stephen F.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60676, 60689, 122 31R, F01K 1700
Patent
active
045452083
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of operating an industrial furnace which is heated by recuperator burners from which the exhaust gases are extracted via injectors.
Such methods aim to use recuperator burners of compact construction which produce a high pressure loss and thus permit a high degree of pyrotechnic efficiency. The injectors extracting the exhaust gases serve to overcome this high pressure loss.
In the past air jet injectors were used, but their effectiveness is limited, quite apart from the fact that additional power is necessary for the production of the injector air.
The object of the invention is to improve the methods referred to in the introduction in such a way that the necessary energy costs are reduced and the degree of pyrotechnic efficiency is increased.
In order to achieve this object the method according to the invention is characterised in that the exhaust gases from the recuperator burners are extracted via steam jet injectors and that the exhaust gas-steam mixture coming from the steam jet injectors is supplied to a waste heat boiler in order to produce water vapour, the water vapour produced in the waste heat boiler serving to drive the steam jet injectors.
The steam jet injectors are capable of overcoming an extremely high pressure loss from the recuperator burners without the necessity of an additional blower. Thus the recuperator burners can be of particularly compact construction and can operate with a correspondingly high degree of pyrotechnic efficiency. Additional energy is not required. On the contrary the waste heat from the industrial furnace is used.
Particularly favourable conditions are produced by passing the exhaust gas-steam mixture from the waste heat boiler through a condensate separator where it is cooled by fresh water flowing in. The recuperator burners utilise the net calorific value of the heating gas, whilst the heat of condensation is recovered in the condensate separator and passed to the fresh water. In addition, the condensate can be mixed with the fresh water so that further heat recovery is also possible here.
According to a further particularly advantageous feature of the invention, when a steam generating water cooling system is used for parts of the industrial furnace which become hot the steam resulting from the water cooling is also supplied to the waste heat boiler. In this way the pressure loss to be overcome in the recuperator burners and thus the degree of pyrotechnic efficiency of the burners can be further increased.
Under these conditions there is also the possibility that the energy supplied to the waste heat boiler exceeds the requirement of the steam jet injectors. In this case the invention proposes that the water vapour generated in the waste heat boiler is expanded in a turbine before it serves to drive the steam jet injectors. Thus the method supplies additional energy from the waste heat of the industrial furnace and this can be used elsewhere.
The steam turbine preferably drives a generator which supplies the current for a blower acting on the recuperator burners. As a rule such a blower is necessary in order to generate the primary air for the recuperator burners. The power requirement for this blower, which in the past was met from a separate source, is now taken from the waste heat from the industrial furnace.
In order to be able to use the advantages of the invention when the industrial furnace is put into operation, the waste heat boiler is heater during the starting phase of the industrial furnace by auxiliary heating means. This auxiliary heating means does use external power, but on the other hand the energy saving achieved is higher.
The invention is described in greater detail below on the basis of preferred embodiments with reference to the accompanying drawings, in which:
FIG. 1 shows a first embodiment;
FIG. 2 shows a second embodiment.
According to FIG. 1 an industrial furnace 1 is provided which is heated by recuperator burners 2. The latter are supplied with gas via duct 3. In addition a blower 4 is provided wh
REFERENCES:
patent: 4422299 (1983-12-01), Sorensen
Husar Stephen F.
Ruhrgas Aktiengesellschaft
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