Showing papers on "Gas heater published in 1982"

Sealed gas heater with forced draft and regulation by microprocessor

Abstract: The invention concerns a control device for gas boilers. The overall functions involving control and safety are ensured by a control box (26) with microprocessor which centralizes data collected from the ambient thermostat (27), the temperature sensor (28) on the duct (21) for heating water return, the air output sensor (19), the drawing contact (31), the extraction fan (6) speed sensor (30), and the lighter (24), and it converts them into digital signals that are made to operate the lighter, the circulation pump (19), the gas inlet electrovalve (12) and the extraction fan according to the control data that the microprocessor has memorized. Application for forced draft steamtight gas boilers.

Security valve for gas heater combustion chamber - has vented sealed box equalising pressure on chamber flexible wall

Abstract: The water heater has a cylindrical layer of water tubes (9) arranged concentrically around the gas burner (6) with a supple exterior shell (1) enveloping the water tubes and exiting on a chimney (8) that collects and evacuates combustion products. The supple shell is enclosed in a sealed box with a volume to carry a pressure equaliser and to recycle the combustion products. The pressure equaliser is a small orifice (23) that communicates the tubular air intake (21) and the intermediate chamber (14) delimited by the supple shell and by the sealed box (12,16).

Centralized monitoring device of gas appliance

Abstract: PURPOSE:To prevent the gas explosion from occuring by a method wherein a gas leakage sensor and a ventilation device are equipped near gas piping in each room in arranging gas heater and the like in each room and, when a gas leakage occurs, the gases of all the rooms are shut off and the ventilation devices of all the rooms are put in operation by means of a central controlling apparatus. CONSTITUTION:The central controlling apparatus 4 as a master machine issues commands to respective slave machines 5 and the respective slave machines 5, upon receipt of the command from the master machine 4, issue command to drive respective room heaters 3. Each slave machine 5 sends information signals on the room heater 3 and on the gas leakage sensor 7 to the master machine 4. The transmission and reception between the master machine 4 and the slave machines 5 are successively repeated. When the gas leakage signal of the gas leakage sensor 7 is received by the master machine 4, the master machine 4 issues stop commands of the room heater 3 to the respective slave machines 5 and at the same time issues the shut-off command of an emergency shut-off valve 2 and operation commands of ventilation device 9 in order to ventilate each room. In such a manner as described above, the gas explosion can be prevented from occuring and the safety and reliability of gas appliances can be improved.

The design and technology development for A 150 mlb resistojet for H2 or NH3

Abstract: A 150 mlb thrust level hybrid resistojet which may operate on either H2 or NH3 is described whose design technique allows temperature distribution forecasting by means of a microcomputer-implemented mathematical model. The longer computer run times that accompany the exclusive use of BASIC, relative to assembled languages, are offset by the flexibility offered and the reduction of reprogramming and debugging efforts. The integration of a compact first-stage coiled heater with a concentric tubular gas heater offers direct matching of the 28 V terminal of the spacecraft system, while keeping maximum heater wall temperatures to less than 60 K over that of the gas temperature at the throat. Among the novel materials employed are grain-stabilized rhenium for heating elements and high purity aluminas for insulators.

Reheating method of treated gas in flue gas desulfurization

Abstract: PURPOSE:To raise the corrosion resistance of a heating tube material as well as permit the operation of a desulfurizer for flue gas without the need to lower the temperature of heat medium even when a variation in load occurs by using a system in which untreated gas is heat-exchanged and the temperature of the heat medium heated is raised by steam, etc. CONSTITUTION:In a heat recoverer 1, untreated gas heats a heat medium sent by a heat medium pump 5 inside the heating tube 12 of the heat recoverer and then enters through a gas duct 15 into a cooling tower 29. In a cooling tower 30, sulfur dioxide present in the untreated gas is absorbed by an absorption liquid, the treated gas is heated in a preheater 31 and further heated by a reheater 2 and also by a heater 3, and the heated gas enters through a gas duct 17 into a steam gas heater 33. By this, even when a variation is load occurs, the desulfurizer can be operated without the need to lower the temperature of the heat medium and also the corrosion resistance of the heating tube material can be raised.

Energy generating system from solid, fossil fuels - using fluidic bed reactor and pollutants scrubbing prior to application to steam and gas turbine combination

Abstract: After fuel combustion in a pressurised fluidic bed reactor, the heat is used for driving a gas and a steam turbine for electric power generation. The flue gases from the fluidic bed combustion are scrubbed of pollutants prior to their supply to the gas turbine. After this scrubbing the flue gases are deeply cooled and then reheated to the gas turbine temperature, prior to intake to the same. Pref. the flue gases are cooled down to approximately 30 deg. K above the dew point temp. prior to scrubbing. Before intake to the gas turbine the flue gases may be heated to 900 deg. C, or below. The flue gas heating may take place in a gas heater as associated to the fluidic bed reactor. Part of the flue gas flow may be separated in front of the gas heater and gas turbine for regulating the fluidic bed and/or the flue gas temp.

Concentrated controlling system for gas units

Abstract: PURPOSE:To assure a safety of gas units when earthquake is occured when the units are started to operate by a method wherein gas pipes for the gas units are applied as the exclusive pipes, and a shut-off valve, an earthquake sensor and a gas pressure measuring device are arranged at the inlet parts of the pipes, and thereby a gas leakage caused when the units are operated is sensed and the units are controlled. CONSTITUTION:Exclusive pipes 5 and a shut-off valve 7 are arranged for a gas heater 4 applied as one example of gas unit, and there are provided an earthquake sensor 9 and the gas pressure measuring device 8 for measuring the gas pressure in the pipe 5. When the earthquake sensor 9 senses the earthquake and when the gas pressure measuring device 8 senses the gas leakage when the gas units are started to operate, the sensed signal is detected by the central processing unit 1, a termination of operation is instructed to the terminal control devices 2 and at the same time the shut-off valve 7 is closed. Then, when abnormal condition of gas leakage etc. is not sensed, the central processing unit 1 opens the shut-off valve 7 and further an operation is instructed to each of the terminal control devices 2.

Method for regulating gaseous temperature in stack gas desulfurization

Abstract: PURPOSE:To improve the corrosion resistance of a titled device without reducing heat medium temp. as far as possible despite the generation of load fluctuations by installing a heat medium heater 3 between the heat medium pipings after elevating temp. with an untreated gas side gas-gas heater. CONSTITUTION:An untreated gas is increased of pressure with a waste gas fan 33 through a gas duct 39, and enters an untreated gas side gas-gas heater 1 by passing through a gas duct 10. In the heater 1, the untreated gas heats the heat medium fed by a heat medium pump 5 in a heat transmitting pipe 28, and enters a cooling tower 34 and absorption tower 35 through a gas duct 11, whereby it is made into a treated gas. Thence, the treated gas is further heated with a heat medium heater 3 in a treated gas side gas-gas heater 2, and is heated by the heat medium introduced into a heat transmitting pipe 29 through a heat medium piping 24, then this gas enters a steam gas heater 36 through a gas duct 13, and is further heated by the steam flowing in a heat transmitting pipe 38. The gas is then released into the atmosphere from a stack 37 through a gas duct 41.

Centralized controlling system of gas heater

Abstract: PURPOSE:To contrive to simplify the controlling system and to reduce the installation cost by a method wherein a gas leakage sensor is provided at every gas heater installed in each room and gas leakage detection signal is centralizedly controlled with a central controlling apparatus through a terminal controller arranged in each room. CONSTITUTION:The driving of a specified room heater 3 is controlled by the signal of a specified terminal controller 4, to which the signal of the central controlling apparatus 6 is sent. At this time, the specified terminal controller 4 sends back information signals on the room heater 3 and on the gas leakage sensor 7 to the central controlling apparatus 6. The transmission and reception between the specified terminal controller 4 and the central controlling apparatus 6 are repeated. When gas leakage is sensed with a gas leakage sensor, the gas leakage signal is sent to the central controlling apparatus 6. Upon the receipt of the gas leakage signal, the central controlling apparatus 6 commands to stop all the room heaters, shuts off an emergency shut-off valve 2 and issues alarm.

Stack gas treating device

Abstract: PURPOSE:To eliminate the need for fresh reducing agents and lower running costs by supplying the reducible-material-contg. gas exhausted from a sulfurous acid gas reducing and sulfur recovering device by coal type reducing agents to a denitrating device and utilizing the same as a reducing agent for a denitration process. CONSTITUTION:The stack gas from a generating source 1 is allowed to contact with the reducible gas formed in a sulfur recovering device 11 in the presence of catalysts in a denitrating device 3, after which it is desulfurized in a dry type desulfurizing device 4, thence it is released as clean gas 5 into the atmosphere. The adsorbent adsorbed SOX is fed to a regenerator 7 through a line 6, and is desorbed. It is next returned to the device 4 through a line 8. Desorbed SO2 is reduced to single S substance by coal 12 in the device 11. Reducing gases such as H2, CO and the like are contained in the stack gas of the device 1. After sulfur is recovered from this gas in the 1st sulfur condenser 14 and the 1st demister, the gas is elevated of temp. by a gas heater 20 and the unreacted SO2 and byproduced H2S are allowed to react in a Claus reactor 23. After the gas is removed of sulfur in the 2nd condenser 23 and the 2nd demister 28, the gas is conducted through a duct 29 and a heater 30 to the device 3.

Air heater operating on either gas or electricity - uses parallel chambers containing electric heating elements and gas combustion chambers in alternate ducts

Abstract: The air heater uses both gas and electricity as energy sources and comprises a sheet metal body with vertical walls (1) separated one from the other so as to form several horizontal channels (2). Alternative chambers either have air flowing through or form combustion chambers (3). The gas burners are (6) placed at the bottom of alternate chambers, while electric heating elements (11) are fitted into the air chambers. A flue (9) is fitted a the top to remove combustion products and a fan (10) forces air horizontally through the heater core. A thermostat is fitted as are controls to allow the use of either gas or electricity as fuel. The gas heater section has an automatic ignition, system with an electronic control box and a ventilator controller. The flame is controlled by a solenoid valve responsive to an insulation detector.

Pilot flame controlled flue gas extractor appts. - uses thermocouple in pilot flame to switch supply to electric motor driving flue gas extraction fan

Abstract: The gas heater has a burner placed near its base and a coil heat exchanger above the burner. The burner is ignited by the pilot light, and a thermocouple placed near the pilot flame controls a switch to start the electric motor driving the exhaust fan. The exhaust fan is horizontally mounted at the top of the heater combustion chamber and directs flue gas out the flue which preheats inlet air. The switch is situated on the hood which contains the ventilator-extractor arrangement. The latter operates either at a reduced speed or max. speed and stops only after a set time interval. The time interval is a function of the difference of the switching temps. of the thermocouple, the heat output of the pilot light and the specific heat of the thermocouple mount.

Operating method for coal fluidized bed type direct reduction process

Abstract: PURPOSE:To remove carbon dioxide and to save equipment costs by including grained coal in a circulating gas on the down stream of a circulating gas blower, and blowing this into a reduction furnace after heating in a recirculation line of a coal fluidized bed type direct reduction process. CONSTITUTION:Iron ore A and slack B are charged into a reducing furnace 1, by which reduced iron C is obtained. The discharged gas from the furnace top is cleaned in a dust remover 3 and a scrubber 4 through a pipeline 2 and is boosted with a circulating gas blower 5. A grained coal blower 6 is provided on the down stream of this blower 5, and the grained powder D in a hopper 10 is introduced into a mixer 7 by a charging mechanism 11, and is mixed with the circulation gas. These are heated in a gas heater 8 and is blown into the furnace 1, whereby they are recirculated. By the blowing of the grained coal D in the circulation gas, carbon monoxide is modified in the gas heater 8 and carbon dioxide is removed, hence a carbon dioxide removing device is abolished or its capacity is decreased and the decrease in the rate of metallization at the reducing is prevented.

Lay down type gas gas heater

Abstract: PURPOSE:To contrive maintenance and inspection of a lay down type gas gas heater and upkeep of a space for a soot blower and to miniaturize a device, by providing a side plate cum rail on a tube bundle and providing a wheel underneath the side plate. CONSTITUTION:A tube bundle side plate 1 provided on a tube bundle 3 is provided with a rail 17, and on its lower side is provided with a wheel 2 as well. As for an installation of the tube bundle 3 of a thermal medium circulation method closed multi-tube type gas gas heater, the wheel 2 provided on the other side plate 1 may well be placed on the rail 17 of the side plate 1.

Safety ventilator for gas instrument

Abstract: PURPOSE:To prevent oblivion for use of a ventilator while a gas heater is in use and to improve safety by constituting that gas supply is made possible by opening a solenoid valve for a gas passage with a confirmation signal confirming that a driving electric current is supplied to a fan motor. CONSTITUTION:When a switch 2 is applied, a fan motor 3 is driven, a reverse parallel diode 4 is electrified causing generation of microvoltage on both ends, a base of a transistor 5 is electrified and a solenoid relay 7 becomes active. Then, a solenoid valve 13 is opened for supply of gas to a gas heater which becomes applicable. At this time, a luminescent diode 8 indicates that the solenoid valve 13 is opened. Then, safety of a gas instrument is improved since gas supply is not made unless driving of a ventilator is made first.

Device for utilizing coldness in liquefied natural gas tanker

Abstract: PURPOSE:To safely utilize the coldness of LNG in an LNG tanker in which the natural gas evaporated in a tank is used as fuel, by performing heat exchange between the natural gas and clean water in brine filled in a heat exchanger. CONSTITUTION:When natural gas in an LNG tank 1 has reached prescribed pressure, the gas is sucked by a compressor 5 through a pipe 4 so that the gas is conducted through a heat exchanger 6 and a gas heater 13 and then supplied as fuel to a boiler 14. In the heat exchanger 6, brine 7 is filled and a clean water cooling pipe 24 is provided to cool clean water from a clean water tank 20. The clean water is utilized in cooling clean water using appliances 15, 16, 17. The temperature of the natural gas or BOG 3, which flows through the heat exchanger 6, is raised by heat exchange with the brine 7, while the clean water is cooled in the heat exchanger 6.

System for recovering power from pressure of blast furnace top gas

Abstract: PURPOSE:To prevent the condensation of moisture in a dry-type dust remover and a power recovering turbine at the time of lowering of the temperature of blast furnace gas, by a method wherein the blast furnace gas fed into the dry-type dust remover is heated to a required temperature when the relative humidity detected at the outlet of the power recovering turbine reaches or exceeds a set point. CONSTITUTION:The blast furnace gas from a blast furnace 1 is passed through a dust remover 2 for coarse particles, then it is heated by passing it through a gas heater 5, is passed through the dry-type dust remover 3 to remove fine particles and is fed to the power recovering turbine 4. When the temperature of the blast furnace at the outlet of the turbine 4 is lowered by some causes, the relative humidity of the gas at that instant is detected by a detector 8 and a pilot flame is ignited by an ignitor 9 provided at an injector part 5a of the heater 5. Simultaneously with the ignition, valves 6, 7 are opened to introduce a clean gas for combustion into the injector part 5a and the openings of the valves 6, 7 are controlled so as to lower the relative humidity of the gas at the outlet of the turbine 4. As a result, danger of condensation of the moisture in the dust remover 3 and the turbine 4 is eliminated and the durability and efficiency of the system are enhanced.

Safety device of gas apparatus

Abstract: PURPOSE:To enable to shut-off the supply of gas even when flame failure occurs during the operation of the gas apparatus by a method wherein the safety device comprising a solenoid valve serving as a closing valve electrically connecting to a controller and the like is provided between the gas apparatus and a main line stop valve. CONSTITUTION:Upon receipt of the signal, which detects the start of the operation of a gas heater 4, from an operation detector 5, the controller 2 issues the signal to timingly open the solenoid valve 3 for safety's sake. When the controller 2 does not receive the signal telling the success of ignition from a flame detector 6 during the predetermined period of time, the controller 2 sends the signal to close the solenoid valve 3. When the controller 2 receives the above- mentioned ignition signal, the solneoid valve 3 remains to be open. Furthermore, when the controller 3 receives the signal telling the actuation of a seismoscope 7, the controller 3 sends the signal to close the solenoid valve 3. Accordingly, the supply of gas is swiftly and surely shut-off when the flame failure occurs during the operation of the gas heater due to boilings-over, wind and the like; when the ignition fails even with the operation of an operating knob; when earthquake occurs and the like.