DE3923805A1 - Prevention of moisture condensation in boiler chimney - involves and moisture sensors which control fuel supply - Google Patents

Abstract

The boiler (1) or other water heating appts. which is equipped with a burner, has its combustion chamber connected to a chimney (4) by a flue (3). The chimney (4) is provided with a temp. sensing device (5) and a moisture sensing device (6) or with an instrument which combines both functions. The devices are connected to the boiler fuel control (2). In the event of the temp. of the flue gases falling below a preset level, or the moisture content rising above a pre-set level, the control (2) increases the fuel supply to the boiler. USE/ADVANTAGE - The control system prevents moisture condensing in the chimney.

Description

The invention relates to a burner-heated device for Example a boiler, water heater or the like, whose combustion chamber to a Ka serving as exhaust gas duct min or the like is connected, this Ge advises at least one characteristic value within the fireplace of the respective physical state measuring and si more gnalizing, with a fuel supply for burning ner control of the device via a Steuerlei connected sensor is assigned.

Are the exhaust ducts of such devices on chimneys concluded, their nature, condition or performance ability does not fully meet the requirements, there is a risk of condensate forming on the Chimney wall. In particular, there is this risk with so-called called condensing boilers with comparatively low  Exhaust gas temperatures.

Such condensation, however, leads in particular old chimneys to a sooting, their performance ability also reduces and leads to dangerous destruction stations of the chimney wall, the renovation or makes a renovation essential.

The object of the invention is such a sooting and to prevent the associated costs. He According to the invention, this object is achieved in that a device of the generic type of sensors both as a temperature sensor or as a humidity sensor or designed as a combination of such sensors and a Control is provided depending on one Limit measured value, for example a minimum temperature and / or a maximum moisture value temporarily up to a fuel supply to achieve a target measured value causes to burners that operate higher than each Lich predetermined fuel supply, preferably the maxi male fuel supply, is.

Such a temporary temperature increase prevents Condensate formation or evaporates at best Condensate that is already appearing immediately.

The only drawing figure shows the burner-heated device, for example a boiler 1 with its controller 2 .

The exhaust gas duct 3 connected to the combustion chamber of this boiler opens into a chimney 4 , in which there is at least one sensor 5 or 6 in an altitude that is favorably selected from case to case, via an electrical signal and control line 7 with which the fuel supply is connected to the burner of the boiler 1 controlling control 2 .

This sensor 5 or 6 is a temperature sensor that could possibly be coupled with a humidity sensor.

This temperature sensor is expedient to be installed approximately in the middle of the height of the chimney 4 and to set the desired temperature as a limit value which should prevail in this height of the chimney in order to prevent sooting.

If this temperature limit is undershot, the normal operation of the boiler is temporarily suspended (interrupted) by this temperature sensor 5 or 6 via the signal and control line 7 and the control 2 of the device 1 and the burner to a higher output, preferably to full -Last, controlled, until the temperature setpoint, i.e. the set limit, is reached at the attachment point of sensor 5 or 6 in chimney 4 and this is signaled by the sensor. The same effect occurs when a humidity sensor 5 or 6 signals that a maximum humidity value has been exceeded and this moisture must be countered by a temporary increase in the exhaust gases flowing through the chimney 4 .

Claims (1)

Burner-heated device, for example a boiler, water heater or the like, the combustion chamber of which is connected to a chimney or the like serving as an exhaust gas duct, this device inside the chimney measuring and signaling at least one characteristic value of the respective physical condition, with a fuel supply to the burner of the device controlling control is assigned via a control line connected sensor, characterized in that the sensor is designed as a temperature sensor or as a moisture sensor or as a combination of such sensors ( 5 ) or ( 6 ) and a controller ( 2 ) is provided which is dependent on one Limit measured value, for example a minimum temperature or a maximum humidity value temporarily until a target measured value causes a fuel supply to the burner, which supplies higher than the operationally predetermined fuel, preferably the maximum fuel supply r, is.