Abstract: A small hot-air circulation furnace performs continuous treatment using hot air at a fixed temperature. Hot air supplied from a heat source is blown out from an axial-flow fan toward a hearth to form a circulating flow passing through an annular heating-target mount on the rotating hearth. The heating-targets are taken out one by one after increasing the temperature of the heating-target on the mount to a predetermined point during one rotation of the hearth. Further, a partition whose outlet-side opening ?2 is narrower than the inlet-side opening ?1 is provided inside the annular partition to supply part of high-temperature gas blown.

Abstract: The present invention provides a fuel feeding apparatus and method for improving the controllability of mixing process and mixing ratio of fuel and combustion air, and a combustion system and method for effecting new combustion properties. The fuel feeding apparatus of the combustion system has fuel feeding means, combustion gas extraction means, steam supply means, mixing means and fuel gas introduction means. The combustion gas extraction means extracts combustion gas of a combustion area therefrom. The mixing means mixes the fuel of fuel feeding means with at least one of combustion gas extracted from the furnace and steam of a steam generator. The fuel gas introduction means introduces a mixed fluid of combustion gas, steam and fuel to the combustion area as a fuel gas, and allows the fuel gas to be mixed with the combustion air.

Abstract: A reactor combustion control method using a high temperature air combustion technology capable of reducing a temperature difference in a reactor without producing cracking and caulking in reaction tubes and the reactor controlled by using the method, the reactor wherein second burners (8) are disposed in a space formed between two or more reaction tubes (7) adjacent to each other so as to inject fuel in the extending direction of the reaction tubes (7).

Abstract: A heat treatment equipment having a heating chamber having a plurality of regenerative combustors provided with direct-fired burner having a built-in porous regenerator, for applying a heat treatment to an object in the heating chamber, wherein the substantial average surface pore diameter is not uniform for porous regenerators in a plurality of direct-fired burners or a plurality of regenerative combustors. By making contrivances in the shape of porous regenerators of the direct-fired burners or the regenerative heat exchangers arranged in an area where substances causing choking tend to easily adhere to make it difficult for such substances to adhere or prevent choking phenomenon from becoming apparent.

Abstract: A gasifying apparatus comprises a gasifier, a reformer and a heating device. The gasifier produces a thermal decomposed gas with use of a thermal decomposition reaction of a liquid or solid fuel such as waste or coal, and the heating device heats a low-temperature steam and air so as to be a high-temperature steam and air, which have a temperature equal to or higher than 700 deg. C. The gasifying apparatus has feeding means including fluid passages for feeding the high-temperature steam and air to the gasifier and the reformer. In a thermal decomposition area of the gasifier, the liquid or solid fuel is thermally decomposed to produce the thermal decomposed gas with sensible heat of the high-temperature steam and air and with the heat generated by an exothermic oxidation reaction between the high-temperature air and the liquid or solid fuel. In the reformer, the thermal decomposed gas is reformed in the existence of the high-temperature steam so as to be a high-temperature syngas.

Abstract: In a regenerator made of materials each comprising alumina as a main ingredient, and used for the regenerative combustion burner which is fired with alternately and repeatedly operations of heat storage by the passage of high-temperature flue gas in a fixed time and heating of combustion air by passage of the combustion air in a next fixed time, under the condition that the flue gas includes metal dust; the alumina purities in the materials for the regenerator are lowered in the order, the high-temperature, medium-temperature and low-temperature parts of the regenerator.

Abstract: A heating apparatus for heating supply of gaseous fluid 1 heats a relatively low temperature gaseous fluid and feeds a heated supply flow to a high temperature gaseous fluid introduction equipment. The heating apparatus has heat exchangers 11, 12 provided with fluid passages through which the low temperature fluid flow passes, a splitting area 15 for dividing a heated supply flow H of gaseous fluid, which is heated by the heat exchanger, into first and second heated gaseous streams H1, H2, and combustion areas 13, 14 in which a combustion reaction of combustible matter takes place in the existence of the first heated gaseous stream. The heated supply flow or the first stream is introduced into the combustion area and the combustible matter is fed thereto, and the combustion area causes the combustion reaction of combustible matter in the existence of the heated supply flow or the first stream. Hot gas produced by the combustion reaction is exhausted through the heat exchanger.

Abstract: With respect to a radiant tube burner to be used for heating a heating furnace or the like, to suppress the generation of NOx accompanying combustion, to make the structure thereof fit for a radiant tube burner equipment, to simplify the control of a fuel supply system and an air supply system, and to prevent the coking. Furthermore, to provide a combustion control scheme appropriate to a radiant tube burner. For these purposes, the present invention placed the respective tips of a fuel nozzle, e.g., pilot burner joint-use nozzle (11), and an air throat (13) in the end of a radiant tube (3) and moreover has a combustion air injection port (33) of the air throat (13) provided to be deviated in contact with or near to the inner circumferential wall surface of the radiant tube (3). In addition, a control device (307) for making a burner burn alternately.

Abstract: A combustion method in an industrial combustion system is provided, in which a low temperature combustion air to be fed to a combustion zone of the combustion system is preheated through a high-cycle regenerative combustion system. The high-cycle regenerative combustion system includes a pair of regenerators of honeycomb structure having a plurality of fluid passages defined by honeycomb walls thereof. Either of the combustion air and an exhaust gas generated in the combustion zone is adapted to selectively flow through the fluid passages, and the high-cycle regenerative combustion system has a switching cycle time set to be 60 seconds at the longest, so that the regenerator is alternately in heat-transferable contact with the combustion air flow and the exhaust gas flow to perform heat exchange therebetween. The regenerator has a temperature efficiency greater than 0.

Abstract: A high-cycle regenerative combustion system has first and second regenerative heat exchanger units. A four-way valve is provided for alternately bringing the heat exchanger units into contact with a low temperature fluid and a high temperature fluid. The valve is switched at a switching cycle time not longer than 60 seconds. Each heat exchanger unit has a void ratio .epsilon. which substantially provides the maximum value (Q/V)max of the volumetric efficiency (Q/V). The temperature efficiency .eta. t is preset to be a value in a range between 0.7 and 1.0. The heat transmission coefficient h and the heat transmission area A of the heat exchanger unit are determined such that the temperature efficiency, which is calculated in accordance with a specific equation as being a function of the heat transmission coefficient, the heat transmission area and the switching cycle time .tau., falls under the preset value within the range mentioned above.

Abstract: An industrial furnace and a burner for regenerative combustion includes a heat storage member, a switching mechanism disposed on one end of the heat storage member, and a burner tile disposed on the opposite end of the heat storage member. The burner tile has a protruding portion extending ahead an air supply and gas exhaust surface. The switching mechanism has a stationary disk and a rotatable disk which slidably contacts the stationary disk. A speed of supply air to the furnace is in operation equal to or higher than a speed of exhaust air therefrom.

Abstract: A honeycomb-like regenerative bed element having an infinite number of cells, characterized in that the following formula is given:f=(1-.beta.).beta..sup.3wherein .beta. is an opening ratio of the regenerative bed element,.beta.=(P-T).sup.2 /P.sup.2P is a pitch of the cells, which is a distance between one center of gravity in one cell and another center of gravity in another cell, the distance extending across a common cell wall perpendicular thereto, andT is a thickness of wall of each of the cells, and that the P and T are set at a maximum value obtained by the formula f or set within a range of values close to that maximum value.P/T ratio, namely, a ratio between P and T may be set at 7.5 or within a range of values from 5 to 10 on the basis of the formula f so as to obtain an optimal conditions for the regenerative bed element.The regenerative bed element is formed from a ceramics material.

Abstract: A method of low-NOx combustion and a burner device for effecting the same, in which a primary fuel is injected in a direction from tile periphery of stream of a combustion air towards that same combustion air, effecting a first combustion, so as to create a generally cylindrical primary flame covering the combustion air, whereby a secondary fuel injected towards the combustion air is shielded or intercepted by such primary flame from the combustion air, while causing NOx in tile primary flame to be reduced by the secondary fuel, after which, a second combustion is effected by bringing the secondary fuel to contact with a portion of the combustion air penetrating through the primary flame, at a downstream side. This arrangement permits more positive decrease of NOx density in an exhaust gas.

Abstract: A burner device of regenerative and alternate combustion type including a pair of burners and a regenerative bed, which permits flow passage changeover to be taken selectively between the pair of burners, via the regenerative bed, by four-way and three-way valves which are simultaneously operated by one actuator. Preferably, both two valves are connected coaxially together. The four-way and three-way valves have a same angle of rotation for executing their respective flow passage changeover actions, but they each have its own inoperative area defined differently from each other to produce a difference in timing for supply of fluid to one of the two burners, thereby providing a lead time for prior supply of air and a delay time for delaying supply of fuel to facilitate ignition in one of the burners during the alternate combustion operation.

Abstract: A method of low-NOx combustion and a burner device for effecting the same, in which a primary fuel is injected in a direction from the periphery of stream of a combustion air towards that same combustion air, effecting a first combustion, so as to create a generally cylindrical primary flame covering the combustion air, whereby a secondary fuel injected towards the combustion air is shielded or intercepted by such primary flame from the combustion air, while causing NOx in the primary flame to be reduced by the secondary fuel, after which, a second combustion is effected by bringing the secondary fuel to contact with a portion of the combustion air penetrating through the primary flame, at a downstream side. This arrangement permits more positive decrease of NOx density in an exhaust gas.

Abstract: A process for the production of allyl chloride, which comprises introducing propylene and chlorine into a reactor having at least one propylene-injection opening and at least one chlorine-injection opening, these openings being independent of each other, through the respective injection openings, and reacting them in a vapor phase, wherein propylene and chlorine are introduced into the reactor by injecting them in almost the same direction from the propylene-injection opening and the chlorine-injection opening which is closest to said propylene-injection opening, with a linear velocity in the propylene-injection opening, calculated as a value of at 300.degree. C. and 1 kg/cm.sup.2.G, of 100 m/sec or higher and a linear velocity of the chlorine-injection opening, calculated as a value of at 100.degree. C. and 1 kg/cm.sup.2.G, of 70 m/sec or higher, and the propylene-injection opening and the chlorine-injection opening are situated to meet the following expression (1),0.5.ltoreq.L/(dp+dc).ltoreq.

Abstract: The present invention relates to a steel heating furnace which permits free setting of an in-furnace temperature pattern or gradient as desired. A steel heating furnace 1 includes at least one or more burner systems of regenerative heating, each being arranged to supply a combustion air and exhaust a combustion gas through a regenerative bed. Those burner systems are disposed in each of plural zones which are defined within a single furnace body, or in each of unit furnaces 2. The unit furnaces 2 are interconnected to form a single furnace body. The amount of combustion may be controlled for each zones or each unit furnaces 2 to enable free variation of in-furnace temperature per zone or per unit furnace 2 so that a desired in-furnace temperature pattern gradient in the entire furnace 1 may be set easily. The steel heating furnace 1 may be constructed with a required length and in-furnace temperature pattern, by interconnecting the unit furnaces.

Abstract: A burner device of regenerative and alternate combustion type including a pair of burners and a regenerative bed, which permits flow passage changeover to be taken selectively between the pair of burners, via the regenerative bed, by four-way and three-way valves which are simultaneously operated by one actuator. Preferably, both two valves are connected coaxially together.The four-way and three-way valves have a same angle of rotation for executing their respective flow passage changeover actions, but they each have its own inoperative area defined differently from each other to produce a difference in timing for supply of fluid to one of the two burners, thereby providing a lead time for prior supply of air and a delay time for delaying supply of fuel to facilitate ignition in one of the burners during the alternate combustion operation.

Abstract: The present invention relates to a low NOx radiant tube burner. The radiant tube burner consists of; a primary combustion chamber which is located outside of the furnace and having an injection outlet of the combustion gas located approximately more inside of the furnace than the bung of the radiant tube, a primary fuel nozzle which injects primary fuel into the primary combustion chamber, and a secondary fuel nozzle which is surrounded with refractory material and injects secondary fuel into the radiant tube from the area adjacent to the injection outlet. Approximately the total amount of the combustion air is supplied into the primary combustion chamber with primary fuel under a high excess air ratio creating primary combustion. The low concentration of oxygen remaining in the primary combustion gas combined with the secondary fuel creates secondary combustion.

Abstract: The present invention relates to a low NOx radiant tube burner. The radiant tube burner consists of; a primary combustion chamber which is located outside of the furnace and having an injection outlet of the combustion gas located approximately more inside of the furnace than the bung of the radiant tube, a primary fuel nozzle which injects primary fuel into the primary combustion chamber, and a secondary fuel nozzle which is surrounded with refractory material and injects secondary fuel into the radiant tube from the area adjacent to the injection outlet. Approximately the total amount of the combustion air is supplied into the primary combustion chamber with primary fuel under a high excess air ratio creating primary combustion. The low concentration of oxygen remaining in the primary combustion gas combined with the secondary fuel creates secondary combustion.