DE951754C - Device for measuring the quotient of several measured values that can be set by resistance sensors to determine the boiler efficiency - Google Patents
Device for measuring the quotient of several measured values that can be set by resistance sensors to determine the boiler efficiencyInfo
- Publication number
- DE951754C DE951754C DEA7576D DEA0007576D DE951754C DE 951754 C DE951754 C DE 951754C DE A7576 D DEA7576 D DE A7576D DE A0007576 D DEA0007576 D DE A0007576D DE 951754 C DE951754 C DE 951754C
- Authority
- DE
- Germany
- Prior art keywords
- resistance
- flue gas
- thermometer
- quotient
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
- G01D1/16—Measuring arrangements giving results other than momentary value of variable, of general application giving a value which is a function of two or more values, e.g. product or ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
Einrichtung zur Messung des Quotienten mehrerer durch Widerstandsgeber einstellbarer Meßgrößen zur Ermittlung des Kesselwirkungsgrades Die Erfindung betrifft eine Einrichtung zur Messung des Quotienten mehrerer durch Widerstandsgeber einstellbarer Meßgrößen, bei welcher derselbe Strom über die Kontaktbürste je eines Widerstandsgebers in mehrere in Reihe liegende Stromverzweigungen fließt, welche Spulen eines Quotientenmessers enthalten.Device for measuring the quotient of several by resistance sensors adjustable measured variables for determining the boiler efficiency The invention relates to a device for measuring the quotient of several adjustable by resistance sensors Measured variables at which the same current is passed through the contact brush of a resistance transmitter flows into several series of current branches, which coils of a quotient meter contain.
Die Erfindung bezweckt, eine derartige Einrichtung zur Ermittlung des Kesselwirkungsgrades aus dem Verhältnis der Dampf- und Rauchgas-Wärmemenge verwendbar zu machen. Während die Messung der Dampferzeugungswärme aus der Dampfmenge durch Temperaturänderungen praktisch nicht beeinfiußt wird, ist die Bestimmung der Rauchgaswärmemenge aus der Rauchgasmenge ziemlich stark von Schwankungen der Rauchgastemperatur abhängig. Zur Beseitigung dieser Unsicherheitsquelle wird erfindungsgemäß in eine der Stromverzweigungen der elektrischen Meßanordnung ein temperaturabhängiger Korrektionswiderstand eingeführt. Derselbe wird, zweckmäßig als Widerstandsthermometer ausgeführt, innerhalb einer der der Rauchgasmengenmessung zugeordneten Verzweigung liegenden Brückenschaltung angeordnet.The aim of the invention is to provide such a device for determining the boiler efficiency from the ratio of the steam and flue gas heat to make usable. While the measurement of the steam generation heat from the amount of steam is practically not influenced by temperature changes, the determination of the amount of heat from the flue gas depends to a large extent on fluctuations in the flue gas temperature. To eliminate this source of uncertainty, according to the invention, a temperature-dependent correction resistor is introduced into one of the current branches of the electrical measuring arrangement. It is expediently designed as a resistance thermometer and arranged within a bridge circuit located in the branch associated with the flue gas quantity measurement.
Da nun nach Möglichkeit auch die Temperaturdifferenz zwischen Rauchgas und Kesselhaus berücksichtigt werden muß, kann erfindungsgemäß einer der dem Widerstandsthermometer in der Brückenschaltung benachbarten Widerstände zugleich als Kesselhausthermometer ausgebildet werden.Since now, if possible, the temperature difference between the flue gas and boiler house must be taken into account, according to the invention one of the resistance thermometer adjacent resistors in the bridge circuit also act as boiler house thermometers be formed.
Es kann aber auch das Kesselhausthermometer innerhalb einer in der Dampfmengenmessung zugeordneten Verzweigung liegenden gesonderten Brücke angeordnet sein.But it can also be the boiler house thermometer within one in the Steam flow measurement assigned branch lying separate bridge arranged be.
Die Bedingungen für das Beseitigen des Einflusses des Rauchgas- und Kesselhaustemperatur sind nun im allgemeinen keineswegs die gleichen. Die Herstellung der Meßeinrichtung und ihre Eichung läßt sich gleichwohl sehr einfach gestalten, wenn man erfindungsgemäß gleiche Thermometer verwendet und durch Bemessung der Brückenwiderstände den Einfluß der Rauchgastemperatur und durch Vor- und Nebenwiderstände den Einfluß der Kesselhaustemperatur beseitigt.The conditions for eliminating the influence of the flue gas and The boiler house temperatures are generally by no means the same. The production the measuring device and its calibration can nevertheless be designed very simply, if the same thermometer is used according to the invention and by measuring the bridge resistances the influence of the flue gas temperature and through series and shunt resistances the influence the boiler house temperature eliminated.
Schließlich gestattet die Meßanordnung auch Einflüsse aus Schwankungen des CO-Gehaltes aus der Messung zu beseitigen, indem die an einem CO-Messer auftretende, vom CO-Gehalt abhängige Spannung in Reihe mit der einen Spule des Quotientenmeßinstrumentes geschaltet wird.Finally, the measuring arrangement also allows influences from fluctuations of the CO content from the measurement by removing the Voltage dependent on CO content in series with one coil of the quotient measuring instrument is switched.
Die Zeichnung zeigt zweckmäßige Ausführungsformen eines Meßgerätes nach der Erfindung.The drawing shows useful embodiments of a measuring device according to the invention.
Von dem nicht dargestellten Rauchgasmengenmesser wird der Widerstandsgeber C und von dem Dampfmengenmesser der Widerstandsgeber D gesteuert (Fig. z). In der der Rauchgasmengenmessung zugeordneten Stromverzweigung befindet sich eine Wheatstonesche Brücke, in welcher der zur Korrektion der im Rauchgas auftretenden Temperaturschwankungen dienende Widerstand W1 als Widerstandsthermometer ausgebildet ist. Der dem Widerstand W1 benachbarte Widerstand W2 ist zugleich als Kesselhausthermometer ausgebildet. Die Widerstände W3 und W4 sind normale Brückenwiderstände, durch deren Bemessung der Einfluß der Rauchgastemperatur bei gleichartiger Ausbildung der Widerstände W,. und W2 beseitigt werden kann. Die vor den Widerständen Nrl und W2 liegenden Widerstände R,, R2 dienen zum Ausgleich der zu den beiden Widerstandsthermometem führenden Leitungslängen.The resistance sensor is used by the flue gas flow meter (not shown) C and the resistance sensor D controlled by the steam flow meter (Fig. Z). In the There is a Wheatstone ash branch associated with the flue gas quantity measurement Bridge in which the temperature fluctuations that occur in the flue gas are corrected Serving resistor W1 is designed as a resistance thermometer. The resistance Resistor W2 adjacent to W1 is also designed as a boiler house thermometer. The resistors W3 and W4 are normal bridge resistances, by their dimensioning the influence of the flue gas temperature with a similar design of the resistors W ,. and W2 can be eliminated. The ones in front of the resistors Nrl and W2 Resistors R ,, R2 are used to compensate for the two resistance thermometers leading cable lengths.
Während die Richtspule b des Quotientenmeßgerätes in der einen Diagonale der Brücke liegt, ist die Auslenkspule a des Instrumentes in die dem Geber D für die Dampfmengenmessung zugeordnete Stromverzweigung geschaltet. Zum Angleich des Gebers D an das Meßinstrument sind die Reihenwiderstände R3 und R4 vorgesehen, von denen einer druckabhängig ausgeführt, den Druckeinfluß auf die Messung beseitigt, während der Parallelwiderstand R5 zur Spule b Temperatureinflüsse auf das Instrument zu beseitigen ermöglicht. Es ist lediglich dafür zu sorgen, daß der Strom der beiden Spulen in gleicher Weise von der Instrumenttemperatur abhängt. Die Schleifkontakte der beiden Widerstandsgeber sind über einen Begrenzungswiderstand R., und die Spannungsquelle Q unmittelbar miteinander verbunden.While the directional coil b of the quotient measuring device is in one diagonal the bridge is, the deflection coil a of the instrument is in the encoder D for the current branch associated with the steam flow measurement is switched. To align the Sensor D to the measuring instrument, the series resistors R3 and R4 are provided by which one is pressure-dependent, eliminates the influence of pressure on the measurement, while the parallel resistance R5 to the coil b influences temperature on the instrument allows to eliminate. It is only necessary to ensure that the flow of the two Coils depends in the same way on the instrument temperature. The sliding contacts the two resistance sensors are via a limiting resistor R., and the voltage source Q directly connected to each other.
-Fig. 2 zeigt eine Ausführung der Meßeinrichtung nach der Erfindung, bei welcher, um die Korrektion der durch die Rauchgastemperatur und die Kesselhaustemperatur auftretenden Fehler durchführen zu können, die Widerstandsthermometer W1 und W2 in getrennten Brücken liegen, deren eine die Spule a und deren andere die Spule b des Quotientenmessers in der einen Diagonale enthält. Die Widerstände i, k, m, n, o, p sind normale Brückenwiderstände.-Fig. 2 shows an embodiment of the measuring device according to the invention, in which, in order to be able to carry out the correction of the errors occurring due to the flue gas temperature and the boiler house temperature, the resistance thermometers W1 and W2 are in separate bridges, one of which is coil a and the other of coil b of the quotient meter in one diagonal. The resistances i, k, m, n, o, p are normal bridge resistances.
Fig. 3 zeigt, aus der Schaltung der Fig. z oder 2 herausgenommen, das Kesselhausthermometer W2 zusammen mit je einem zusätzlichen Vor- und Parallelwiderstand R7 und Ra, durch deren Bemessung bei gleicher Ausbildung der Thermometer W, und W2 der Einfluß der Kesselhaustemperatur beseitigt wird.Fig. 3 shows, removed from the circuit of Fig. Z or 2, the boiler house thermometer W2 together with an additional series resistor and a parallel resistor R7 and Ra, by their dimensioning with the same design the thermometer W, and W2 the influence of the boiler house temperature is eliminated.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA7576D DE951754C (en) | 1940-03-06 | 1940-03-06 | Device for measuring the quotient of several measured values that can be set by resistance sensors to determine the boiler efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA7576D DE951754C (en) | 1940-03-06 | 1940-03-06 | Device for measuring the quotient of several measured values that can be set by resistance sensors to determine the boiler efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE951754C true DE951754C (en) | 1956-10-31 |
Family
ID=6921276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEA7576D Expired DE951754C (en) | 1940-03-06 | 1940-03-06 | Device for measuring the quotient of several measured values that can be set by resistance sensors to determine the boiler efficiency |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE951754C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1124252B (en) * | 1958-11-24 | 1962-02-22 | Reutlinger & Soehne Inst Fuer | Device for the elimination of the influences of a variable dielectric of a capacitive scanning arrangement for measuring mechanical-dynamic quantities |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE469496C (en) * | 1926-08-06 | 1928-12-13 | Siemens & Halske Akt Ges | Device for the electrical adjustment of a variable depending on several variables, for example an amount of steam |
| DE498072C (en) * | 1926-12-16 | 1930-05-19 | Siemens & Halske Akt Ges | Combustion regulator |
| DE531011C (en) * | 1929-11-23 | 1931-08-04 | W H Joens & Co G M B H | Electrical measuring device |
| DE597893C (en) * | 1929-09-22 | 1934-06-01 | Martin Paul | Circuit for the multiplication of any electrical measured values shown by branching an electric current through a sliding contact moved in dependence on the measured value over two parallel resistors, the sum of which is constant |
-
1940
- 1940-03-06 DE DEA7576D patent/DE951754C/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE469496C (en) * | 1926-08-06 | 1928-12-13 | Siemens & Halske Akt Ges | Device for the electrical adjustment of a variable depending on several variables, for example an amount of steam |
| DE498072C (en) * | 1926-12-16 | 1930-05-19 | Siemens & Halske Akt Ges | Combustion regulator |
| DE597893C (en) * | 1929-09-22 | 1934-06-01 | Martin Paul | Circuit for the multiplication of any electrical measured values shown by branching an electric current through a sliding contact moved in dependence on the measured value over two parallel resistors, the sum of which is constant |
| DE531011C (en) * | 1929-11-23 | 1931-08-04 | W H Joens & Co G M B H | Electrical measuring device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1124252B (en) * | 1958-11-24 | 1962-02-22 | Reutlinger & Soehne Inst Fuer | Device for the elimination of the influences of a variable dielectric of a capacitive scanning arrangement for measuring mechanical-dynamic quantities |
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