Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Kao Corporation

Mitsubishi Hitachi Power Systems, Ltd.

Toshimitsu Ichinose

Kimishiro Tokuda

Keigo Matsumoto

Yuichi Fujioka

Koutaro Fujimura

Satoshi Uchida

Jun Kasai

Kazuhiro Domoto

Naofumi Abe

Fumiya Nakashima

Akio Hiraki

Katsuyuki Ueda

Hirokazu Hino

Akira Yamada

Noboru Moriyama

Yoshihiko Tsuchiyama

Shigeyasu Ishigami

Koichi Sakamoto

Kan Ogata

Hiroshi Kikuchi

Kenji Yamamoto

Kenji Kiyama

Shozo Kaneko

Akira Baba

Masaaki Nagai

Koji Kuramashi

Toshihiko Mine

Miki Shimogori

Ryuichiro Tanaka

Kikuo Tokunaga

Yoshihisa Arakawa

Toshiaki Ohkubo

Masashi Hishida

Yoshiyuki Wakabayashi

Hideaki Oota

Tokuda Kimishiro

Tsutomu Hashimoto

Yuichi Hino

Yoshitaka Baba

Yasuo Souda

Syozo Kaneko

Hitoji Yamada

Masaharu Ooguri

A burner includes: an inner gas nozzle which extends along an axis while surrounding the axis, and which is capable of supplying a furnace with an inner combustion oxygen containing gas; a fuel supply nozzle surrounding the inner gas nozzle as seen in a direction along the axis, the fuel supply nozzle being capable of supplying the furnace with a fluid mixture of a solid powder fuel and a carrier gas; an outer gas nozzle surrounding the fuel supply nozzle as seen in the direction along the axis, the outer gas nozzle being capable of supplying the furnace with an outer combustion oxygen containing gas; and a flow-velocity-ratio adjustment apparatus capable of adjusting a relative flow velocity ratio of a discharge flow velocity of the inner combustion oxygen containing gas to a discharge flow velocity of the outer combustion oxygen containing gas.

Burner, combustion device, boiler, and burner control method

A solid-fuel-fired burner that suppresses a high-temperature oxygen remaining region formed at the outer circumference of a flame and that can decrease the amount of NOx eventually produced is provided. A solid-fuel-fired burner that is used in a burner section of a solid-fuel-fired boiler for performing low-NOx combustion separately in the burner section and in an additional-air injection section and that injects powdered solid-fuel and air into a furnace includes a fuel burner having internal flame stabilization and a secondary-air injection port that does not perform flame stabilization, in which the air ratio in the fuel burner is set to 0.85 or more.

Solid-fuel-fired burner and solid-fuel-fired boiler

A combustion burnerincludes a fuel nozzlethat injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzlesthat inject secondary air from the outer periphery of the fuel nozzle, and a flame holderthat is arranged in an opening of the fuel nozzle. In the combustion burner, the flame holderhas a splitting shape that widens in the flow direction of the fuel gas. When seen in cross section along a direction in which the flame holderwidens, the cross section passing through the central axis of the fuel nozzle, a maximum distance h from the central axis of the fuel nozzleto the widened end of the flame holderand an inside diameter r of the openingof the fuel nozzlesatisfy h/(r/2)&#x3c;0.6.

Combustion burner and boiler including the same

A heavy oil emulsified fuel evaporator system is provided in which a heavy oil emulsified fuel, after being preheated at a preheater, flows into an evaporator to be heated and then to a separator for separation of its water content. The water content, after being separated, is used as a preheating source medium for said preheater, wherein water content separation at a predetermined level is enabled irrespective of load change in a heavy oil fuel combustion equipment, and no light oil content is discharged together with the separated water content. Heavy oil emulsified fuel is preheated at a preheater , is heated at an evaporator and flows into a separator to be separated of its water content. Water content, after being separated, is sent via a piping to be used as the preheating source medium for the preheater . Inlet temperature of the evaporator is maintained constant, and pressure in the piping for leading the preheating source medium into the preheater is also maintained constant. Further, temperature difference of outlet temperature relative to the inlet temperature of the evaporator is maintained constant. Thereby, the water content in the heavy oil fuel coming out of the separator can be maintained at a predetermined value.

Heavy oil emulsified fuel evaporator system and operation method thereof

This invention relates to a method for decreasing sulfuric acid and sulfuric anhydride present in combustion exhaust gas which comprises adding an SO,-decreasing agent (hydrogen gas) to combustion exhaust gas and thereby reducing sulfuric acid (H,SO,) and sulfuric anhydride (SO,) present in the combustion exhaust gas, as well as a combustion exhaust gas flow system therefor. Thus, this invention provides a method for decreasing sulfuric acid and sulfuric anhydride present in combustion gas which can prevent the occurrence of troubles (e.g., low-temperature corrosion and ash deposition) arising from H,SO,and S,contained in combustion gas.

Method for decreasing sulfuric acid and sulfuric anhydride present in combustion exhaust gas

A boiler recovers a soda component from pulp spent liquor and is able to prevent carry-over of unburnt char and deformation of a char bed configuration and to attain a stable combustion with low NO,generation. By regulating the combustion air supply, and feeding inert gas along a furnace side wall around the char bed, there are formed a combustion zone of reduction atmospheric field where air ratio in the surroundings of the char bed is 0.8 or less, a combustion zone of reduction atmospheric field where air ratio is 1.0 or less and unburnt components exist (including the case of a reduction atmospheric field where air ratio is 1.0 or less and unburnt components exist with the two combustion zones being combined together) and a combustion zone where combustion is completed.

Recovery boiler

A heavy oil emulsion fuel combustion apparatus is arranged, in a combustion apparatus using a heavy oil emulsion fuel, to prevent a decrease in the combustion efficiency due to water content in the fuel and to prevent an increase in the sulfuric acid dew point due to water content in the exhaust gas. A heavy oil emulsion fuel 101 from a fuel tank 100 is led to a fuel heater 110 and is heated. Then the heated heavy oil emulsion fuel 102 is led to a water content evaporator 120. In the water content evaporator 120, the heavy oil emulsion fuel 102 is heated by the use of extraction steam from a steam turbine facility 160 or steam produced through a steam converter 166, and the resulting fuel is led to a steam separator 140. In the steam separator 140, the fuel 111 is separated into steam and light oil combustible gas vapor 121 and a heavy oil portion 122, the latter 122 being used as boiler fuel 131. The steam and light oil combustible gas vapor 121 is used as a heat source for heating performed in the fuel heater 110.

Heavy oil emulsion fuel combustion apparatus

A pulverized coal combustion burner has a circumferential distribution of pulverized coal density at an outlet portion of a pulverized coal nozzle made uniform, and a complete NO.sub.x decrease is attained. An oil gun (01) for stabilizing combustion is provided at a center portion. An annular sectional oil primary air flow path (02) surrounds the oil gun (01), and an annular sectional pulverized coal and primary air mixture flow path (14) surrounds the oil primary air flow path (02). Around the mixture flow path (14) is an annular sectional secondary air flow path (15), and an annular sectional tertiary air flow path (16) surrounds the secondary air flow path (15). A pulverized coal supply pipe is connected in the tangential direction to the mixture flow path (14). Further, an entering angle control (28) of the mixture is provided within the pulverized coal supply pipe (11). Within the mixture flow path (14), a pulverized coal density dividing cylinder (25) is provided.

Pulverized coal combustion burner

A heavy oil emulsified fuel combustion apparatus is provided in which steam bubbles generated in the pressure reduction operation for dewatering a heavy oil emulsified fuel before combustion are prevented from mixing into a dewatered heavy oil side resulting in lowering of a dewatering efficiency. In a heavy oil emulsified fuel combustion boiler, a heavy oil emulsified fuel 101 is heated by a heater 110 and dewatered by a flusher 120 and then introduced into a boiler 10 for combustion, and water 152 obtained by the dewatering is sent to a water utilizing system of the boiler. The heavy oil emulsified fuel 102 is heated in a high pressure and then introduced into a pressure reducing device 200 to be applied by a pressure reduction by multi-stage orifices 201 for dewatering. The pressure reduction is done with a pressure reduction per stage of 1 to 3 ata.

Heavy oil emulsified fuel combustion apparatus

Method for producing superheavy oil emulsion fuel

A method for producing a superheavy oil emulsion fuel comprising the steps of (i) preparing a liquid mixture comprising a superheavy oil, water, one or more nonionic surfactants having an HLB (hydrophilic-lipophilic balance) of 13 to 19, and optionally one or more stabilizers, and then agitating the resulting liquid mixture with a high shear rate of 1000/sec to 60000/sec, to give an oil-in-water (O/W) type emulsion fuel having a superheavy oil concentration of from 74 to 82% by weight; and (ii) adding at least one of ionic dispersants, and optionally water, to the emulsion fuel obtained in step (i), and then blending and agitating the resulting liquid mixture with a shear rate of 10/sec to 10000/sec, to give an oil-in-water (O/W) type emulsion fuel having a superheavy oil concentration of from 68 to 79% by weight. In step (i), the nonionic surfactants are contained in an amount of from 0.1 to 0.8% by weight of the emulsion fuel obtained in step (i), and the stabilizers are contained in an amount of from 0.001 to 0.5% by weight of the emulsion fuel obtained in step (i). In step (ii), the ionic dispersants are contained in an amount of from 0.01 to 0.5% by weight of the emulsion fuel obtained in step (ii).

Method for producing superheavy oil emulsion fuel and fuel produced

A heavy oil emulsified fuel combustion furnace is provided which prevents lowering of combustion efficiency due to water content in the fuel as well as prevents elevation of sulfuric acid dew point due to water content in the flue gas of the combustion furnace. In the apparatus a heavy oil emulsified fuel (102) is heated by a heater (110) using a heat pipe etc. and then is separated by a water vaporizer (120) into heavy oil (122) and vapor (121) consisting of steam and a light oil combustible gas. The heavy oil (122) is supplied to a burner port of the combustion furnace, such as a boiler etc. The vapor (121) is condensed by a condenser (140) to produce liquid (141) comprising a mixture of water and light oil. The liquid (141) is separated by an oily water separator (150) into oil (151) and water (152). The oil (151) is used as a fuel for an igniting torch of the combustion furnace 10 and the water (152) is used partially as cooling water (41) for an SO.sub.X removal apparatus (40) and partially as an atomizing steam 9 or a soot blowing steam 8 in the boiler, etc.

Heavy oil emulsified fuel combustion equipment

In a coal gasification power generator, coal gas 500 obtained by gasifying a coal 100 by a gasifying furnace is introduced into a desulfurization furnace in which the coal gas 500 is desulfurized by limestone 400. A coal gas 501 after desulfurization is burned by a combuster 5 after it has passed through a dust removing unit 3 so that high temperature combustion gas 800 is supplied to a gas turbine. The gas turbine 7 drives a power generating unit. Exhaust gas 801 from the gas turbine is supplied to an exhaust gas boiler 8. Char 60a produced in the gasifying furnace and limestone 60b containing CaS emitted from the desulfurization furnace are burned in an oxidation furnace, and by using the resultant combustion gas, water vapor introduced from the exhaust gas boiler 8 is heated by a heat exchanger, and thereafter it is supplied to the gasifying furnace as a gas. With the above construction, chemical energy possessed by the coal is effectively converted into electric energy, and also the rate of desulfurization of coal gasifying gas is improved thereby reducing emitted sulfur oxide.

Coal gasification power generator

In a coal gasification power generator, a coal gas 500 obtained by gasifying coal 100 by a gasifying furnace 1 is introduced into a desulfurization furnace 2 in which the coal gas 500 is desulfurized by limestone 400. A coal gas 501 after desulfurization is burned by a combuster 5 after it has passed through a dust removing unit 3 so that a high temperature combustion gas 800 is supplied to a gas turbine 7. The gas turbine 7 drives a power generating unit. An exhaust gas 801 from the gas turbine 7 is supplied to an exhaust gas boiler 8. A char 60a produced in the gasifying furnace 1 and limestone 60b containing CaS emitted from the desulfurization furnace 2 are burned in an oxidation furnace 4, and by using the resultant combustion gas, water vapor 30a introduced from the exhaust gas boiler 8 is heated by a heat exchanger 10, and thereafter it is supplied to the gasifying furnace 1 as a gas 700. With the above construction, chemical energy possessed by the coal 100 is effectively converted into electric energy, and also the rate of desulfurization of coal gasifying gas is improved thereby reducing emitted sulfur oxide.

Growing community of inventors

Nagasaki, Japan

Toshimitsu Ichinose