Abstract: A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air than passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air.

Abstract: A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air then passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air.

Abstract: A boiler has a radiation heat transfer section with opposite sides and boiler water tubes therein for passing boiler water to be heated by combustion gas in the radiation heat transfer section. The boiler water moves substantially in a selected direction in the radiation heat transfer section. A plurality of regenerative-heating-type burner systems are connected to the radiation heat transfer section. Each burner system has a regenerative bed and a burner. The burner systems are in pairs on the opposite sides of the radiation heat transfer section. A first mechanism supplies combustion air through the bed and to the burner of each burner system while a second mechanism supplies fuel to each burner system to form a flame that produces the combustion gas. A third mechanism causes the flow of air and gas to be changed over at intervals. Each pair of burner systems is controlled separately for defining a plurality of temperature zones in the radiation heat transfer section.

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 TPA variant with replacement of amino acids is provided. In a typical embodiment, the variant has an amino acid sequence with replacement of the amino acid group consisting of asparagine at the 37th position, serine at the 38th position, glycine at the 39th position, arginine at the 40th position, alanine at the 41st position, and glutamine at the 42nd position from the N-terminus of the amino acid sequence of mature human tissue plasminogen activator.

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.