Showing papers on "Gas heater published in 1987"

Method for treating waste liquid in flue gas treatment apparatus

Abstract: PURPOSE: To enable an efficient treatment of a waste liquid in a flue gas treatment apparatus by injecting a controlled amount of a circulating liquid into an upper stream of a dry dust collector so as to collect dried solid materials, while the flue gas undergoes a dry dust collection and wet treatments and the absorbing liquid is supplied to a cooling tower and an absorption tower. CONSTITUTION: A flue gas 2 from a boiler 1 is sent to a dry dust collector 3 to have soot and dust removed. A dedusted gas 5 is next introduced into a cooling tower 6 by way of a gas heater 33, wherein halides, soot and dust are removed, then introduced into an absorption tower 6 to have SOX removed and discharged as a clean flue gas 9. A washing liquid in the cooling tower 6 is circulated through a circulating line 11 and a part of the circulating gas is sent to a neutralizing tank 25, wherein gypsum is formed by an alkali reagent from a line 24. A slurry formed in the tank is sent to an evaporator 27 by way of a line 26, wherein the slurry is evaporated and dried, and dry materials formed are collected by the dry dust collector 3. Under these circumstances, a take-out quantity of the circulating liquid is controlled by a valve 41 so that a lowering of the flue gas temperature becomes 4W8°C by a signal 39 sent to a controller 40 concerning a boiler load or a flow rate of flue gas. COPYRIGHT: (C)1989,JPO&Japio

Multitube type reaction apparatus

Abstract: PURPOSE:To reduce the leakage of a heating medium and to make the titled apparatus compact, by constituting said apparatus of a multitube type reactor of which the axial direction is set to a vertical direction and a cooler, a gas heater, a heating medium heater, etc which are provided to the outer periphery of said reactor so as to make the axial direction thereof parallel to that of the reactor CONSTITUTION:The reaction gas supplied into the upper header 41 of a multitube type reactor 1 is subjected to chemical reaction by the catalyst in a heat transfer pipe 4 to be sent into a lower header 25 Heat generated when the reaction gas is subjected to chemical reaction in the heat transfer pipe 4 is cooled by the heating medium in a main body 15 A part of the heating medium forcibly sent into a lower ring header 50 by a recirculation pump 17 is supplied into the main body 73 of a cooler 7 from the lower ring header 50 through a recirculation pipe 78 and exchanges heat with boiler water sent into a boiler water supply pipe 14 and a heat transfer pipe 14 from a boiler drum

Control device for top temperature of blast furnace having dry dust collector

Abstract: PURPOSE:To maintain an exhaust gas at the dew point or above at all times and to prevent the function deterioration of a dry dust collector by providing a cooler to the upper stream side of the dry dust collector and a heater to the down stream side, interposing a heat medium circulating piping between the same and controlling the circulation rate of the heat medium with the top temp. of a blast furnace. CONSTITUTION:The gas cooler 11 is disposed between dry dust collector 3 and a coarse dust remover 2 and the gas heater 12 is disposed between the dry dust collector 3 and a turbine 4. The gas cooler 11 and the gas heater 12 are connected by the heat medium piping 13 and a circulation pump is interposed in the mid-way thereof. The top temp. of the blast furnace 1 is detected by a thermometer 6 before the dry dust collector 3 when said temp. rises to the heat resistant temp. of the dry dust collector 3 or above. The circulation rate of the heat medium of the circulation pump 14 is then adjusted to control the gas temp. so as to prevent said temp. from rising to the heat resistant temp. of the dry dust collector 3 or above. The sensible heat of the top furnace gas which is deprived of in the gas cooler 11 is again applied to the gas side by the gas heater 12 and the energy is recovered by the turbine 4.

Combined heat-cooking device

Abstract: PURPOSE:To make possible a safe and a wide variety of cooking, by providing a heater and an induction heater being integrated in one body, making the best use of respective merits of each characteristics. CONSTITUTION:On one side of a casing 1, a gas heater 4 with a gas burner 3 appearing through a burner hole 2 is provided and on the other side thereof an induction heater 7 having a heating coil 5 and a controller 6 is provided being integrated with said gas heater. The gas heater 4 is separated from the induction heater 7 by a partition plate 9 which has air holes 9a thereon. The induction heater 4 includes a cooling fan 10 and air suction holes 11 at the bottom of the casing 1 facing the cooling fan 10. When the electric source of the induction heater 7 is turned ON, induction heating is started and at the same time the cooling fan 10 begins to rotate, causing outside air to flow-in through the air suction holes 11, so that electronic parts of the controller 6 are cooled and heat of discharged air therefrom flows through the air holes 9a of the partition plate 9 to the side of the gas heater 4, where part of said heat being discharged from the burner hole 2, the remainder being discharged from discharge holes 12 on the side of the gas heater 4.

Exhaust-gas heat exchanger

Abstract: PURPOSE: To simplify the mechanism of an exhaust gas heat exchanger equipped with a denitrification unit significantly by placing a catalyst for reducing nitrogen oxides in an intermediate bend formed in the case of an exhaust gas heat exchanger of diesel engine, or the like CONSTITUTION: An exhaust gas heat exchanger 1 comprises a tubular body section 1a having upper and lower end plates 1b, 1c, and a case including a bend case part 1d wherein an intermediate bend 10 is provided in the case and the NOx reducing catalyst 20a for a denitrification unit 20 is disposed in the intermediate bend 10 Exhaust gas (g) generated from an engine is introduced to a heat exchanging section along with ammonia (m) injected from the forward end of an inlet duct 11 and passed around a group of finned tubes 5 where it is cooled through heat exchange with refrigerant flowing through each tube 5 The cooled exhaust gas is passed through the catalyst 20a in the intermediate bend 10 and NOx in the exhaust gas is reduced efficiently The exhaust gas from which NOx is reduced is then introduced to a low temperature water supply gas heater 30 where heat recovery is effected efficiently

Pressure swing type gas separator in methanol decomposition apparatus

Abstract: PURPOSE:To contrive to improve the gas separation capacity and gas purity, by exchanging the heat of a regenerated gas with waste gas using a heater provided in the course of a regenerated gas conduit and completing the regeneration of adsorption columns of a gas separator. CONSTITUTION:A raw material methanol 1 and pure water 2 are heated in a preheater 3 and fed to a reactor 7. A heating medium heated in a heating furnace 16 is fed to the reactor 7 to heat a catalyst layer in the reactor 7. The methanol 1, etc., are passed through the catalyst layer and decomposed. The resultant decomposed gas 11 is fed to a separation unit 13 to separate hydrogen and/or carbon monoxide. In the process, a purified hydrogen conduit 14 for purified hydrogen discharged from the adsorption column 22 in the pressurized adsorption step is connected to the adsorption column 22 in the decompressed desorption step with a regenerated gas conduit 27 to carry out the heat exchange of the waste gas from the heating furnace 16 with the regenerated gas in a regenerated gas heater 25.

Regenerating method for adsorbent

Abstract: PURPOSE:To quickly restore adsorption performance by bringing an adsorbent of which the adsorption performance is deteriorated by the carbon component sticking thereto into contact with air or O2-contg. gas heated to 500-650 deg.C thereby burning away the carbon component. CONSTITUTION:Valves 3, 6 are opened and the gas to be dried enters an adsorption column 1 where the moisture is adsorbed by an adsorbent bed 2 and the dry gas is emitted from a dry gas outlet 13 in the stage of adsorbing the moisture. Valves 4, 7 are opened and part 14 of the dried product gas is heated to 200-300 deg.C by a heater 9, then the gas is passed through the bed 2 to desorb the moisture therefrom in the stage of desorbing the moisture. The valves 4, 5 are opened and the O2-contg. gas is fed by a blower 10 and is heated to 500-650 deg.C by a gas heater 8, then the heated gas is passed through the bed 2 to burn away the carbon component sticking thereto in the stage of regenerating the adsorbent. The adsorption performance is thus restored.

Gas turbine system of high thermal efficiency by use of methanolic fuel

Abstract: PURPOSE:To obtain a high thermal efficiency by a simple and inexpensive system by providing a methanol carburator, a boiler, an endthermic reactor, a superheater, and a heater in a specified order so as to mix superheated steam with combustion gas for feeding the mixture to a turbine. CONSTITUTION:High temperature exhaust gas exhausted from a turbine 1 is discharged into the atmosphere through gas flues 4 and 4', however, waste heat of the exhaust gas is recovered by each of equipments on the halfway. In this case, No.1 waste heat recovery system which is composed of a steam superheater 5, and an endthermic reaction produced gas heater 6, and No.3 waste heat recovery system which is composed of a boiler 8 and a methanol carburator 9, are arranged in series in order along the flow line of turbine exhaust gas. And after steam which is extracted from the boiler 8 through lines 25 and 32, is superheated by the superheater 5, it is extracted as superheated steam by a line 33. And then the superheated steam is mixed with combustion gas of endthermic reaction produced gas so as to be fed into the turbine 1.

Oscillating gas heater

Abstract: PURPOSE:To make a positive ignition, prevent an erroneous ignition and facilitate an operation by a method wherein means for sensing a normal combustion of a burner is provided to allow an operation of a rotary driving mechanism only in a normal combustion of the burner. CONSTITUTION:An oscillating gas heater is provided with an osillating mechanism for reciprocating a main body in this rotational direction, a burner combustion control mechanism including a spark unit SP acting as an ignition device and a flame rod FL acting s a flame sensor and a control circuit 5. The control circuit 5 is provided with a flame sensing circuit 51 having a flame rod FL acting as a sensor, the flame sensing circuit 51 is provided with a transistor T1 to be conducted when an output of the flame rod FL (a resistance between positive and negative poles is less than a specified value) is applied and a relay R1 for closing a contact point a1 arranged between the oscillating control circuit 53 and the power supply only when the transistor T1 is conducted. With this arrangement, the oscillating movement is made only during a time in which the presence of the flame is sensed by the flame rod under a normal combustion of the burner.

Start aid device for diesel engine

Abstract: PURPOSE:To enhance starting characteristics and the engine operating perfor mance by shutting off once the current to a suction gas heating means at the time of cold start, beginning current supply when it is judged that the rate of increment of the revolving speed has exceeded a certain level, and thereby enhancing ignition characteristics of the later part of continued combustion period CONSTITUTION:A glow plug 4 and a suction gas heater 5 are heated at the time of cold start, and suction gas heating of said heater 5 is once stopped after starting of a starter 2, and when the rate of increment of the revolving speed exceeds a certain level, suction gas heating of the heater 5 is resumed Therefore, the engine 1 begins suctions gas heating at the later part of the continued combustion period to provide an exhanced ignition characteristic, which leads to enhancement of the starting characteristics and blowup perfor mance This is because increase of engine combustion force by suction gas heating allows quick transition to the full combustion period, as the sum of the engine combustion force and the drive force of said starter 2 is in equilib rium with the drive friction force of engine 1 in the later part of continued combustion period

Apparatus for sampling flue gas specimen in chimney

Abstract: PURPOSE:To enable highly accurate measurement and to extend the replacement cycle of a filter element and a gas heater, by mounting a jacket pipe to a gas suction pipe over the total length thereof and providing a mist filter to a pretreating pipe. CONSTITUTION:A gas sampler 2 is provided in the vinity of the upper end of a chimney 1 equipped with a washing and desulfurizing apparatus of a flue gas and a jacket pipe 4 is mounted to the gas suction conduit 3 connected to said gas sampler 2 and extending to the vicinity of the ground along the total length of said conduit 3. A steam pipe 6 is connected to the jacket pipe 4 and the outer surface of the jacket pipe 4 is covered with a heat insulating material 11. A mist filter 18 is provided to the pretreating pipe 15 connecting the inlet of the gas heater positioned on the ground and the gas suction conduit 3 and a gas analyser is connected to the outlet of the gas heater 23 through a feed pipe 25 and a pump 26. By this method, the flue gas specimen can be sent to a gas analyser in a saturated state.

Electronic ionisation sensor for automatic controlling the air demand in gas heated apparatus

Abstract: In a gas heater, the pilot flame is provided with a CO sensor sensing the rate of ionization of the flame, and producing a signal. The signal controls an electronic control system which regulates the speed of a fan placed in the exhaust duct and the gas feed valve.

Gas heater with catalysis

Abstract: PURPOSE:To realize secured initial ignition and smooth transfer of catalytic reaction by providing at a section of a pilot nozzle arranged on the upper end of a gas burner a deformed piece the upper section of which inclines to the outer circumferential side and the lower section of which inclines to the central portion and placing a bimetal for temperature control under a catalysis. CONSTITUTION:A gas from a gas tank 8 is injected from a pilot nozzle 17 through the hollow section 19 in a gas burner 12 via a gas nozzle 9. Part of the gas is injected in the direction of arrow A and other part of the gas is injected in the direction of arrow B from a deformed piece 17a the upper section of which inclines to the outer circumferential side and the lower section of which inclines to the central portion, and both are suitably mixed with air and ignited by the sparks from a high voltage terminal 18 for ignition such as a piezo-electric device, etc. The ignited gas is transferred from a gas nozzle 11 of the gas burner to the gas which has passed through a catalysis 16 to continue the catalystic reaction, and the volume of the gas injected is extremely reduced by the catalytic reaction. Further, because there is no component member (for example, bimetal) which disturbs the air flow and the gas flow in the upper section of the catalysis, the reaction continues efficiently.

Method for regenerating denitration catalyst

Abstract: PURPOSE:To regenerate a denitration catalyst without necessitating large amounts of heat like a conventional method by passing high-temp. exhaust gas which is produced in a denitration system of the running side of a denitration facility for a refuse incinerator through the catalyst deteriorated in denitration efficiency of a waiting incinerator system. CONSTITUTION:In denitration system 21-26 and waiting incinerator system, 11-16, exhaust gas of a running incinerator 21 is directly introduced into a catalytic reactor 14 of a waiting incinerator or introduced thereinto after passing it through a dust collector 17. In this case, exhaust gas in an outlet of the incinerator is mixed with air and regulated at about 400 deg.C. After regenerating the catalyst, exhaust gas is introduced into an running catalytic reactor 24 an induction ventilating machine 15 of a waiting incinerator and denitrated and thereafter discharged from a stack 26 via a running induction ventilating machine 25. Further in case of passing the exhaust gas of the incinerator through an electrostatic precipitator, the temp. of exhaust gas is made to 250-280 deg.C and therefore it is heated at about 400 deg.C by a direct-fired gas heater 18 and thereafter introduced into the catalytic reactor of the waiting incinerator. In such a way, the catalyst is regenerated without wholly using a heat source or with a small amount of heat.