US3610208A - Boiler protective system - Google Patents
Boiler protective system Download PDFInfo
- Publication number
- US3610208A US3610208A US844806A US3610208DA US3610208A US 3610208 A US3610208 A US 3610208A US 844806 A US844806 A US 844806A US 3610208D A US3610208D A US 3610208DA US 3610208 A US3610208 A US 3610208A
- Authority
- US
- United States
- Prior art keywords
- boiler
- temperature
- steam
- pressure
- measurements
- 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 - Lifetime
Links
- 230000001681 protective effect Effects 0.000 title description 6
- 238000005259 measurement Methods 0.000 claims abstract description 37
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 33
- 238000009530 blood pressure measurement Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000013021 overheating Methods 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 36
- 238000012423 maintenance Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
Definitions
- This invention relates generally to water heating vessels and more particularly to a process and apparatus for automatically monitoring the operation of a boiler for determining when the boilers water level becomes critically low and for initiating appropriate corrective action to prevent damage to the boiler.
- a conventional safety device for monitoring water level in a steam boiler typically comprises an external water column adapted to reflect the water level in the boiler and a switch which is closed or opened when the water level falls below a selected point. Operation of this switch is normally designed to cut off the firing circuit which heats the boiler and to provide an alarm or some other indication that the boiler is not functioning properly.
- These conventional devices all require regular and extensive maintenance and testing, including daily cleaning of the water column to avoid scale buildup and daily testing of the switch equipment. So long as this is done regularly, conventional apparatus will adequately maintain a safe water level. However, most boiler failures are attributed to poor maintenance and inspection of conventional safety devices. There is thus a need for an automatic boiler safety device which does not require regular maintenance.
- a boiler protective device in accordance with a preferred embodiment demonstrating objects and features of the present invention employs the fact that when the water level in a saturated steam boiler becomes critically low, the boilers upper fire tubes become exposed above the water surface.
- the exposed fire tubes apply heat directly to saturated steam in the region above the water surface and super heat the steam. Since saturated steam has a distinct temperature for any given pressure and since the temperature-pressure characteristic of saturated steam is known, the superheated condition is detected by apparatus which measures the temperature and pressure of the steam and compares the temperature measurement with the pressure measurement to determine when these measurements are not related in accordance with the temperature-pressure characteristic of saturated steam.
- the comparing apparatus includes means for converting one of the measurements into an expected value of the other in accordance with the known pressure-temperature characteristic of saturated steam and means for comparing the expected value with the actual measurement. When the actual measurement and the expected value are not substantially equal, the apparatus initiates appropriate corrective action to prevent damage to the boiler.
- FIG. 1 is a schematic representation of a boiler protective system constructed in accordance with the present invention.
- FIG. 2 is a schematic representation of a comparator suitable for use in the system of FIG. 1.
- a saturated steam device of the type wherein the present invention is employed comprises a steam and water chamber, with steam being generated by heating the water from below its surface.
- the present description will relate to a preferred embodiment of the invention as employed in a simple steamgenerating boiler of the tire tube type. It is to be understood, however, that the present invention is applicable to numerous other boiler configurations, such as those high efficiency boilers of the water tube type which produce saturated steam in normal operation.
- boiler 10 in FIG. 1 comprises a steam and water containing vessel or boiler shell 12 having a water supply 20 with a steam region 22 and a steam outlet nozzle 24 located above the water level 18.
- Noule 24 communicates with an appropriate steam utilization device not shown.
- the boiler shell encloses fire tubes 14, shown only symbolically in end view in FIG. 1, which communicate with a burner 16 and conduct superheated gases, the product of combustion in burner 16, through water supply 20 to heat the water.
- the detailed structure of fire tube boilers, such as boiler 10 are well known in the art and will not be described here in detail.
- the water level 18 is above the uppermost row of fire tubes 14', and the water is heated from beneath its surface 18, producing saturated steam in region 22. If water level 18 should fall below the uppermost fire tubes 14, heat transfer away from the exposed fire tubes would be substantially reduced and the temperature of the tubes would rise appreciably, creating a substantial danger of damage to the boiler and its surroundings.
- the water level is monitored by a water actuated switch which indicates when the water level is below a selected safe level.
- a water actuated switch which indicates when the water level is below a selected safe level.
- the function of the water level measuring device is supplemented, or in some situations supplanted, by a boiler protective system which monitors the condition of the steam in region 22. So long as the steam is saturated, the water reservoir is being heated from beneath water surface 18. if water level 18 falls critically low, for example, to level 18', the steam becomes superheated because heat is applied directly to the steam in region 22 by exposed fire tubes 14'.
- the present invention monitors this condition and controls burner 16 to make appropriate adjustments to prevent damage to the boiler.
- the present invention employs a temperature measuring device 28 having a temperature sensing probe 30 located in the steam space 22 of the boiler, and a pressure measuring device 32, having a pressure probe 34 located within space 22. It is to be understood that devices 28 and 32 and probes 30 and 34 are only representations and any of many well-known temperature-measuring and pressuremeasuring devices could be used. lt is also to be understood that temperature and/or pressure readings may be taken within nozzle 24 or elsewhere along the system.
- both the temperature and pressure measurements are applied to a comparator 36, as shown by symbolic arrows 44 and 46, where the measured temperaturepressure relationship is compared with the known temperature-pressure characteristic for saturated steam.
- a preferred method for making this comparison is shown in FIG. 2, where one measurement is converted into an expected value of the other in accordance with the known temperature-pressure characteristic of saturated steam, and the expected and measured valves are then compared. It is to be understood that either the temperature measure may be converted to a pressure reading or the pressure measure may be converted to a temperature reading.
- the system shown in FIG. 2 converts the actual pressure reading into an expected temperature reading. This is accomplished in pressure-to-temperature converter 38, which is mechanically or electrically linked to pressure sensing device 32. Suitable devices for converting one measured quantity into another in accordance with a known nonlinear relation are well known in the art.
- converter 38 may simply be an amplifier having a gain characteristic directly proportional to the temperature-pressure characteristic of saturated steam. Since the relationship between temperature and pressure for saturated steam is nonlinear, the amplifier would have a nonlinear gain characteristic.
- the comparison may also be made by mechanical means.
- a cam may be mounted on a shaft which turns in response to steam pressure as indicated by pressure-measuring device 32. The cam may drive an indicator along a linear scale by means of a suitable cam follower. The cam may be machined to provide a pressure-to-temperature conversion which corresponds to the temperature-pressure characteristic of saturated steam.
- the output of converter 38 is a mechanical or electrical indication of the expected temperature of steam in the boiler if the boiler is producing saturated stearn.
- This expected temperature and the actual measured temperature from device '28 which may also be reflected in mechanical or electrical terms in accordance with the type of converter 38 which is employed, are compared in comparator 40. If the actual temperature and the expected temperature are substantially equal within a selected range of error, no corrective action is taken. If, however, the expected and measured temperatures are not substantially equal, the comparator provides an appropriate signal to activate an alarm 42 or to initiate appropriate corrective action, for example, by shutting ofi burner 16, or both, as in the illustrative embodiment shown in the drawing.
- Apparatus for providing appropriate control signals on the occurrence of an inequality between the measured and expected temperatures is well known in the art.
- a simple electronic comparator having an output lead which assumes a voltage when one applied signal exceeds another or a pair of mechanical pointers having an area of mutual contact when both pointers are indicating approximately the same reading but making no contact when different readings are indicated may be used.
- the range of error within which substantial equality of the measured and expected value is determined may be selected according to the use to be made of the system.
- the expected and measured temperatures should be deemed substantially equal so long as they are not more than 3 F. apart.
- a safety device for preventing overheating of a saturated steam boiler of the type including an enclosed vessel, a heat source, a liquid reservoir within said enclosed vessel, and one or more fire tubes positioned within said enclosed vessel beneath the surface of said liquid reservoir during normal operation of said boiler, said fire tubes communicating with said heat source for applying heat to said reservoir from beneath the surface thereof, said safety device comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperaturepressure characteristics of saturated steam, and means operative when said measurements are not related substantially in accordance with said known temperature-pressure characteristics for cooling the fire tubes exposed above the surface of said liquid reservoir.
- said comparing means includes means for converting one of said measurements to an expected value of the other of said measurements in accordance with the temperature-pressure characteristic of saturated steam and means for comparing said other measurement with said expected value for determining whether they are substantially equal.
- Apparatus as defined in claim 1 including means for activating a warning device when said measurements are not related in accordance with said known temperature-pressure characteristic.
- a safety device for preventing overheating of a saturated steam boiler comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means for limiting the application of heat to said boiler when said measurements are not related in accordance with said known temperature-pressure characteristics.
- a method for preventing damage in a saturated steam device comprising the steps of:
Abstract
A safety device for indicating when the water level is critically low in a steam boiler makes use of the fact that steam in a boiler becomes superheated when the boiler water level falls below the boiler''s uppermost fire tubes. The present apparatus measures the steam temperature and the steam pressure and compares the two to determine whether they are related to one another in accordance with the temperature-pressure characteristic of saturated steam. If the measurements are not so related, the safety device initiates appropriate corrective action to prevent damage to the boiler.
Description
United States Patent [72] Inventor Douglas E. Penning Dublin Road, Southhury, Conn. 06488 [21] Appl. No. 844,806 [22] Filed July 25, 1969 [45] Patented Oct. 5, 1971 [54] BOILER PROTECTIVE SYSTEM 6 Claims, 2 Drawing Figs.
[52] U.S. Cl l22/504.2, 73/345 [51 Int. Cl F22b 9/18, F22!) 35/18, 001k 3/00 [50] Field of Search 73/345, 17, 17 A; 340/229; 122/504, 504.2
[56] References Cited UNITED STATES PATENTS 780,336 1/1905 Glascodine 73/345 2,152,979 4/1939 Schwander 1/1967 Sensing 2/1967 Hennecke Primary Examiner-Louis R. Prince Assistant Examiner-Denis E. Corr Attorney-Amster & Rothstein ABSTRACT: A safety device for indicating when the water level is critically low in a steam boiler makes use of the fact that steam in a boiler becomes superheated when the boiler water level falls below the boilers uppermost fire tubes. The present apparatus measures the steam temperature and the steam pressure and compares the two to determine whether they are related to one another in accordance with the temperature-pressure characteristic of saturated steam. If the measurements are not so related, the safety device initiates ap propriate corrective action to prevent damage to the boiler.
Y r 28 PRESSURE TEMPERATURE MEASURING MEASURING DEVICE DEVICE COMPARATOR ALARM TEMPERATURE ALARM MEASURING DEVICE INVENTOR. DOUGLAS E. PENNING A ih-i-idtdZ ATTORNEYS PATENTEU um 51971 PRESSURE MEASURING DEVICE COMPARATOR CONVERTER BOILER PROTECTIVE SYSTEM This invention relates generally to water heating vessels and more particularly to a process and apparatus for automatically monitoring the operation of a boiler for determining when the boilers water level becomes critically low and for initiating appropriate corrective action to prevent damage to the boiler.
A conventional safety device for monitoring water level in a steam boiler typically comprises an external water column adapted to reflect the water level in the boiler and a switch which is closed or opened when the water level falls below a selected point. Operation of this switch is normally designed to cut off the firing circuit which heats the boiler and to provide an alarm or some other indication that the boiler is not functioning properly. These conventional devices all require regular and extensive maintenance and testing, including daily cleaning of the water column to avoid scale buildup and daily testing of the switch equipment. So long as this is done regularly, conventional apparatus will adequately maintain a safe water level. However, most boiler failures are attributed to poor maintenance and inspection of conventional safety devices. There is thus a need for an automatic boiler safety device which does not require regular maintenance.
It is a primary object of the present invention to provide a safety device for monitoring the water level in a steam boiler which will continue to operate consistently and accurately even without regular maintenance.
It is another object of this invention to provide a boiler safety device which does not come in contact with the water reservoir of the boiler and hence is immune to scale buildup.
It is still another object of this invention to provide an automatic low-water control for steam boilers that is economical to manufacture and easy to install.
A boiler protective device in accordance with a preferred embodiment demonstrating objects and features of the present invention employs the fact that when the water level in a saturated steam boiler becomes critically low, the boilers upper fire tubes become exposed above the water surface. The exposed fire tubes apply heat directly to saturated steam in the region above the water surface and super heat the steam. Since saturated steam has a distinct temperature for any given pressure and since the temperature-pressure characteristic of saturated steam is known, the superheated condition is detected by apparatus which measures the temperature and pressure of the steam and compares the temperature measurement with the pressure measurement to determine when these measurements are not related in accordance with the temperature-pressure characteristic of saturated steam. In a preferred embodiment of the invention, the comparing apparatus includes means for converting one of the measurements into an expected value of the other in accordance with the known pressure-temperature characteristic of saturated steam and means for comparing the expected value with the actual measurement. When the actual measurement and the expected value are not substantially equal, the apparatus initiates appropriate corrective action to prevent damage to the boiler.
Additional objects, features and advantages of the present invention will be apparent from the following detailed description of a presently preferred embodiment thereof, when taken in connection with the appended drawing wherein:
FIG. 1 is a schematic representation of a boiler protective system constructed in accordance with the present invention, and
FIG. 2 is a schematic representation of a comparator suitable for use in the system of FIG. 1.
A saturated steam device of the type wherein the present invention is employed comprises a steam and water chamber, with steam being generated by heating the water from below its surface. The present description will relate to a preferred embodiment of the invention as employed in a simple steamgenerating boiler of the tire tube type. It is to be understood, however, that the present invention is applicable to numerous other boiler configurations, such as those high efficiency boilers of the water tube type which produce saturated steam in normal operation.
Referring to the drawing, boiler 10 in FIG. 1 comprises a steam and water containing vessel or boiler shell 12 having a water supply 20 with a steam region 22 and a steam outlet nozzle 24 located above the water level 18. Noule 24 communicates with an appropriate steam utilization device not shown. The boiler shell encloses fire tubes 14, shown only symbolically in end view in FIG. 1, which communicate with a burner 16 and conduct superheated gases, the product of combustion in burner 16, through water supply 20 to heat the water. The detailed structure of fire tube boilers, such as boiler 10, are well known in the art and will not be described here in detail.
In normal operation, the water level 18 is above the uppermost row of fire tubes 14', and the water is heated from beneath its surface 18, producing saturated steam in region 22. If water level 18 should fall below the uppermost fire tubes 14, heat transfer away from the exposed fire tubes would be substantially reduced and the temperature of the tubes would rise appreciably, creating a substantial danger of damage to the boiler and its surroundings. conventionally, the water level is monitored by a water actuated switch which indicates when the water level is below a selected safe level. However, as indicated above, such control devices require constant and careful maintenance which is frequently not provided.
In accordance with the present invention, the function of the water level measuring device is supplemented, or in some situations supplanted, by a boiler protective system which monitors the condition of the steam in region 22. So long as the steam is saturated, the water reservoir is being heated from beneath water surface 18. if water level 18 falls critically low, for example, to level 18', the steam becomes superheated because heat is applied directly to the steam in region 22 by exposed fire tubes 14'. The present invention monitors this condition and controls burner 16 to make appropriate adjustments to prevent damage to the boiler.
To determine whether the steam in region 22 is saturated or superheated, the present invention employs a temperature measuring device 28 having a temperature sensing probe 30 located in the steam space 22 of the boiler, and a pressure measuring device 32, having a pressure probe 34 located within space 22. It is to be understood that devices 28 and 32 and probes 30 and 34 are only representations and any of many well-known temperature-measuring and pressuremeasuring devices could be used. lt is also to be understood that temperature and/or pressure readings may be taken within nozzle 24 or elsewhere along the system.
To detect superheating, both the temperature and pressure measurements are applied to a comparator 36, as shown by symbolic arrows 44 and 46, where the measured temperaturepressure relationship is compared with the known temperature-pressure characteristic for saturated steam. A preferred method for making this comparison is shown in FIG. 2, where one measurement is converted into an expected value of the other in accordance with the known temperature-pressure characteristic of saturated steam, and the expected and measured valves are then compared. It is to be understood that either the temperature measure may be converted to a pressure reading or the pressure measure may be converted to a temperature reading.
The system shown in FIG. 2 converts the actual pressure reading into an expected temperature reading. This is accomplished in pressure-to-temperature converter 38, which is mechanically or electrically linked to pressure sensing device 32. Suitable devices for converting one measured quantity into another in accordance with a known nonlinear relation are well known in the art. For example, converter 38 may simply be an amplifier having a gain characteristic directly proportional to the temperature-pressure characteristic of saturated steam. Since the relationship between temperature and pressure for saturated steam is nonlinear, the amplifier would have a nonlinear gain characteristic. The comparison may also be made by mechanical means. For example, a cam may be mounted on a shaft which turns in response to steam pressure as indicated by pressure-measuring device 32. The cam may drive an indicator along a linear scale by means of a suitable cam follower. The cam may be machined to provide a pressure-to-temperature conversion which corresponds to the temperature-pressure characteristic of saturated steam.
However the conversion is made, the output of converter 38 is a mechanical or electrical indication of the expected temperature of steam in the boiler if the boiler is producing saturated stearn. This expected temperature and the actual measured temperature from device '28, which may also be reflected in mechanical or electrical terms in accordance with the type of converter 38 which is employed, are compared in comparator 40. If the actual temperature and the expected temperature are substantially equal within a selected range of error, no corrective action is taken. If, however, the expected and measured temperatures are not substantially equal, the comparator provides an appropriate signal to activate an alarm 42 or to initiate appropriate corrective action, for example, by shutting ofi burner 16, or both, as in the illustrative embodiment shown in the drawing.
Apparatus for providing appropriate control signals on the occurrence of an inequality between the measured and expected temperatures is well known in the art. For example, a simple electronic comparator having an output lead which assumes a voltage when one applied signal exceeds another or a pair of mechanical pointers having an area of mutual contact when both pointers are indicating approximately the same reading but making no contact when different readings are indicated may be used.
It is to be understood that the range of error within which substantial equality of the measured and expected value is determined may be selected according to the use to be made of the system. In a mechanical system for use in conjunction with a standard fire tube boiler, it has been found that the expected and measured temperatures should be deemed substantially equal so long as they are not more than 3 F. apart.
It is to be understood that the above-described embodiments are merely examples of the application of the novel principles of the present invention. Numerous additional embodiments will be devised by those skilled in the art without departing from the spirit or scope of the present invention.
What is claimed is:
l. A safety device for preventing overheating of a saturated steam boiler of the type including an enclosed vessel, a heat source, a liquid reservoir within said enclosed vessel, and one or more fire tubes positioned within said enclosed vessel beneath the surface of said liquid reservoir during normal operation of said boiler, said fire tubes communicating with said heat source for applying heat to said reservoir from beneath the surface thereof, said safety device comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperaturepressure characteristics of saturated steam, and means operative when said measurements are not related substantially in accordance with said known temperature-pressure characteristics for cooling the fire tubes exposed above the surface of said liquid reservoir.
2. A safety device in accordance with claim 1 wherein said comparing means includes means for converting one of said measurements to an expected value of the other of said measurements in accordance with the temperature-pressure characteristic of saturated steam and means for comparing said other measurement with said expected value for determining whether they are substantially equal.
3. A safety device in accordance with claim 2 wherein said one measurement is said pressure measurement and said other measurement is said temperaturemeasurement.
4. Apparatus as defined in claim 1 including means for activating a warning device when said measurements are not related in accordance with said known temperature-pressure characteristic.
5. A safety device for preventing overheating of a saturated steam boiler comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means for limiting the application of heat to said boiler when said measurements are not related in accordance with said known temperature-pressure characteristics.
6. A method for preventing damage in a saturated steam device comprising the steps of:
a. measuring the temperature of said steam,
b. measuring the pressure of said steam,
c. converting one of said measurements to an expected value of the other measurement in accordance with the known pressure-temperature characteristic of saturated steam,
d. comparing said expected value to said other measure ment to determine when said measurements are different by more than an acceptable amount, and
e. limiting the application of heat to said device when said measurements are different by more than said acceptable amount.
Claims (6)
1. A safety device for preventing overheating of a saturated steam boiler of the type including an enclosed vessel, a heat source, a liquid reservoir within said enclosed vessel, and one or more fire tubes positioned within said enclosed vessel beneath the surface of said liquid reservoir during normal operation of said boiler, said fire tubes communicating with said heat source for applying heat to said reservoir from beneath the surface thereof, said safety device comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means operative when said measurements are not related substantially in accordance with said known temperature-pressure characteristics for cooling the fire tubes exposed above the surface of said liquid reservoir.
2. A safety device in accordance with claim 1 wherein said comparing means includes means for converting one of said measurements to an expected value of the other of said measurements in accordance with the temperature-pressure characteristic of saturated steam and means for comparing said other measurement with said expected value for determining whether they are substantially equal.
3. A safety device in accordance with claim 2 wherein said one measurement is said pressure measurement and said other measurement is said temperature measurement.
4. Apparatus as defined in claim 1 including means for activating a warning device when said measurements are not related in accordance with said known temperature-pressure characteristic.
5. A safety device for preventing overheating of a saturated steam boiler comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means for limiting the application of heat to said boiler when said measurements are not related in accordance with said known temperature-pressure characteristics.
6. A method for preventing damage in a saturated steam device comprising the steps of: a. measuring the temperature of said steam, b. measuring the pressure of said steam, c. converting one of said measurements to an expected value of the other measurement in accordance with the known pressure-temperature characteristic of saturated steam, d. comparing said expected value to said other measurement to determine when said measurements are different by more than an acceptable amount, and e. limiting the application of heat to said device when said measurements are different by more than said acceptable amount.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84480669A | 1969-07-25 | 1969-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3610208A true US3610208A (en) | 1971-10-05 |
Family
ID=25293675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US844806A Expired - Lifetime US3610208A (en) | 1969-07-25 | 1969-07-25 | Boiler protective system |
Country Status (1)
Country | Link |
---|---|
US (1) | US3610208A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267890A (en) * | 1979-02-05 | 1981-05-19 | Caterpillar Tractor Co. | Fire extinguishing system including sensor comparable to determine charge |
US4671296A (en) * | 1984-12-27 | 1987-06-09 | Aitken Louis F | Racehorse athletic condition measuring instrument |
US20040181349A1 (en) * | 2002-12-31 | 2004-09-16 | Tynkov Boris M. | Boiler water level monitoring and control system |
US6932028B1 (en) | 2004-10-06 | 2005-08-23 | Vogt Power International Inc. | Apparatus and method for determining a liquid level in a steam drum |
DE102013218009A1 (en) * | 2013-09-09 | 2015-03-12 | Robert Bosch Gmbh | Method for operating a steam boiler and apparatus for carrying out the method |
DE102013218012A1 (en) * | 2013-09-09 | 2015-03-12 | Robert Bosch Gmbh | Method for operating a steam boiler and apparatus for carrying out the method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US780336A (en) * | 1903-04-25 | 1905-01-17 | Richard Thomson Glascodine | Apparatus for indicating pressure or temperature, or both, of saturated steam. |
US2152979A (en) * | 1935-10-01 | 1939-04-04 | Des Vehicules Sev Soc Et | Process and apparatus for regulating the feed of single tube boilers |
US3302171A (en) * | 1964-10-01 | 1967-01-31 | Gen Motors Corp | Vehicle engine coolant condition indicator |
US3302460A (en) * | 1964-11-17 | 1967-02-07 | Stewart Warner Corp | Temperature gauge |
-
1969
- 1969-07-25 US US844806A patent/US3610208A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US780336A (en) * | 1903-04-25 | 1905-01-17 | Richard Thomson Glascodine | Apparatus for indicating pressure or temperature, or both, of saturated steam. |
US2152979A (en) * | 1935-10-01 | 1939-04-04 | Des Vehicules Sev Soc Et | Process and apparatus for regulating the feed of single tube boilers |
US3302171A (en) * | 1964-10-01 | 1967-01-31 | Gen Motors Corp | Vehicle engine coolant condition indicator |
US3302460A (en) * | 1964-11-17 | 1967-02-07 | Stewart Warner Corp | Temperature gauge |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267890A (en) * | 1979-02-05 | 1981-05-19 | Caterpillar Tractor Co. | Fire extinguishing system including sensor comparable to determine charge |
US4671296A (en) * | 1984-12-27 | 1987-06-09 | Aitken Louis F | Racehorse athletic condition measuring instrument |
US20040181349A1 (en) * | 2002-12-31 | 2004-09-16 | Tynkov Boris M. | Boiler water level monitoring and control system |
US7409301B2 (en) | 2002-12-31 | 2008-08-05 | Cleaver-Brooks, Inc. | Boiler water level monitoring and control system |
US6932028B1 (en) | 2004-10-06 | 2005-08-23 | Vogt Power International Inc. | Apparatus and method for determining a liquid level in a steam drum |
DE102013218009A1 (en) * | 2013-09-09 | 2015-03-12 | Robert Bosch Gmbh | Method for operating a steam boiler and apparatus for carrying out the method |
DE102013218012A1 (en) * | 2013-09-09 | 2015-03-12 | Robert Bosch Gmbh | Method for operating a steam boiler and apparatus for carrying out the method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4590797A (en) | Thermal system for measuring liquid levels | |
US5385202A (en) | Method and apparatus for operational monitoring of a condenser with tubes, by measurements at selected tubes | |
US4534662A (en) | Device for detecting vapor leakages | |
US3610208A (en) | Boiler protective system | |
US4418035A (en) | Coolant condition monitor for nuclear power reactor | |
US5545877A (en) | Cooking vessel with water detection means | |
US5406915A (en) | Steam generation system mass and feedwater control system | |
US4764024A (en) | Steam trap monitor | |
US8739621B2 (en) | Electrical heating element and method of measuring a filling level | |
US3610025A (en) | Tube leak detector | |
JP2007078559A (en) | Device and method for measuring temperature of core coolant, and reactor monitor | |
US4781469A (en) | Detecting proximity or occurrence of change of phase within a fluid | |
US4414177A (en) | Liquid level, void fraction, and superheated steam sensor for nuclear reactor cores | |
KR850007484A (en) | Thermal stress prediction device of pressure-resistant tube | |
JPS59112290A (en) | Reactor core monitoring device | |
RU95403U1 (en) | CONDUCTIVE SIGNAL OF LIQUID AVAILABILITY IN PAIR | |
US4293853A (en) | Method and apparatus for detecting flow instability in steam generator | |
CN114005558A (en) | FBG real-time leakage monitoring method and system for main steam pipeline of nuclear power station | |
US3701283A (en) | Pressure-subtracting hypsometric apparatus | |
JPS5721100A (en) | X-ray generator | |
SU647542A1 (en) | Thermocouple-based level gauge | |
US3387593A (en) | Safety device for fired pressure vessels | |
JPS63173921A (en) | Apparatus for measuring quality of steam | |
Zhang et al. | The cause analysis and treatment of the positive deviation for RPVL/RPVDT measured temperatures in an EPR nuclear power plant | |
JPH0362236B2 (en) |